CN100461946C - Method of switching-over between systems - Google Patents
Method of switching-over between systems Download PDFInfo
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- CN100461946C CN100461946C CNB2005100827000A CN200510082700A CN100461946C CN 100461946 C CN100461946 C CN 100461946C CN B2005100827000 A CNB2005100827000 A CN B2005100827000A CN 200510082700 A CN200510082700 A CN 200510082700A CN 100461946 C CN100461946 C CN 100461946C
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Abstract
The method includes procedures: in switching flow, based on version of protocol supported by 2G destination mobile switching center (MSC) and base station controller, MSC in 3G network system / mobile switching server or radio network controller (RNC) converts cell ID discriminator and network number of mobile network included in cell ID of source cell to be switched to cell ID discriminator, 2G destination MSC and network number of mobile network of base station controller recognized by 2G destination MSC and base station controller respectively. The method realizes switching user terminal from 3G network system to 2G network system.
Description
Technical field
The calling that the present invention relates to wireless communication field is switched, and refers to a kind of from the call handover method of 3G network system to the 2G network system especially.
Background technology
In present communications network system, 2G network system and 3G network system also deposit.The user who makes a call might cross over two network systems in the call process, do not interrupt in order to guarantee user's communication, just need carry out the switching between 2G and the 3G network system.
Especially at 3G network system first stage of construction, its coverage rate is wide inadequately, should make full use of the existing good resource of 2G network, for the user provides business service.
But from the 3G network system when the 2G network system is switched, if mobile switching centre of 2G system (MSC) or base station controller (BSC) are not done upgrading, then because the protocol version that the MSC of 2G or BSC support is lower, can not correctly discern the cell-of-origin sign that the user carries when 3G network makes a call, thereby cause handoff failure.
Because in the prior art, 2G system (is example with the gsm system) has made detailed regulation to cell ID, and is specific as follows:
" cell ID discriminator (bit 1 to 4 of byte 3) " is byte 4-n (Cell identification) particular content that is used for the distinguishing cell sign, its expression cell ID is Cell Global Identity (Cell GlobalIdentifier, whole still parts CGI)." cell ID discriminator " specific coding thes contents are as follows:
The cell ID discriminator is that the cell ID coding of Cell Global Identity (CGI) (Binary Zero 000) is as follows:
In the last table, MCC (Mobile Country Code) is a Mobile Country Code MCC; MNC (Mobile NetworkCode) is the mobile network network No..
The coding of byte 4-8 is referring to Location Area Identification (Location AreaIdentification, LAI) definition of cell of GSM 04.08 agreement.
The coding of byte 9-10 is referring to cell identification (Cell Identity, CI) definition of cell of GSM04.08 agreement.
The effective value of " the cell ID discriminator " of gsm system (Cell identification discriminator) has only CGI (0000
Binary system), LAC_CI (0001
Binary system), CI (0010
Binary system).
3G network system (is example with the universal mobile telecommunication system), " cell ID discriminator " to be expanded, its specific coding thes contents are as follows:
The effective value of " the cell ID discriminator " of UMTS system has:
CGI (0000
Binary system), LAC_CI (0001
Binary system), CI (0010
Binary system), LAI (0100
Binary system), LAC (0101
Binary system), LAI_RNC ID (1000
Binary system), RNC ID (1001
Binary system), LAC_RNCID (1010
Binary system), SAI (1011
Binary system).
According to 25413 agreements, when RNC switched between the system that initiates from UMTS to GSM, cell-of-origin sign (Source ID) was SAI, corresponding " cell ID discriminator "=1011
Binary system(SAI).Like this, not under the upgrade case, can't discern these " cell ID discriminator " (1011), cause handoff failure at 2G MSC.In addition, the network No. MNC of UMTS network may be different from the MNC of existing 2G MSC, makes 2G MSC-B/BSC can not discern the cell-of-origin sign equally, causes handoff failure.
Summary of the invention
The invention provides a kind of inter-system switching method, limit in order to solve the protocol version ability that exists in the prior art, cause from the problem of 3G network system handoff failure when the 2G network system is switched owing to mobile switching centre in the 2G network system and base station controller support.
The inventive method is applied to the switching of 3G network system to the 2G network system, this method comprises: in switching flow, by the mobile switching centre in the 3G network system/mobile swap server MSC/MSCServer or radio network controller (RNC), protocol version according to 2G target mobile switching centre that will switch to and base station controller support, the cell ID discriminator that comprises in the cell ID with the handover source sub-district is converted to the cell ID discriminator that described 2G target mobile switching centre and base station controller can be discerned; And
When if mobile network network No. MNC in the 3G network system and the MNC in the 2G network system are also inequality, 2G target mobile switching centre and base station controller that the MSC/MSC Server of described 3G network or RNC switch according to request, inquire about the 2G target mobile switching centre that stores among the MSC/MSC Server of described 3G network or the RNC and the mapping table of base station controller and affiliated mobile network thereof, obtain the MNC of mobile network under 2G target mobile switching centre and the base station controller, the MNC that comprises in the cell ID with the handover source sub-district converts the MNC of mobile network under 2G target mobile switching centre and the base station controller to.
According to said method of the present invention, store tables of data among the MSC/MSC Server of described 3G network or the RNC;
Comprise in the described tables of data: the protocol version information that 2G target mobile switching centre and base station controller are supported, and support the 2G target mobile switching centre of diversity of protocol versions and the cell ID discriminator that base station controller can be discerned;
In switching flow, 2G target mobile switching centre and base station controller that MSC/MSC Server or RNC switch according to request are inquired about described tables of data, obtain the cell ID discriminator that 2G target mobile switching centre and base station controller can be discerned.
If the conversion by MSC/MSC Server realizes described cell ID discriminator and MNC comprises the steps:
The RNS RNS at the user terminal place that request is switched reports reconfiguration request by the Iu interface to the MSC/MSC of described 3G network Server, carries the cell ID of user terminal handover source sub-district;
After the MSC/MSC Server of 3G network receives the reconfiguration request that RNS reports, with cell ID discriminator and the MNC that comprises in the described cell ID, be converted to the MNC of mobile network under cell ID discriminator that 2G target mobile switching centre and base station controller can discern and 2G target mobile switching centre and the base station controller respectively;
If it is the 2G base station controller that belongs to this exchange that the MSC/MSC Server of 3G network judges described 2G target base station controller, then send the handoff request message of a 2G network to the 2G target base station controller by the A interface, carry the cell ID that carries out cell ID discriminator and MNC conversion, carry out switching flow.
According to said method of the present invention, described switching flow comprises:
The 2G target base station controller returns handoff request acknowledgment message to the MSC/MSC of 3G network Server;
The MSC/MSC Server of 3G network issues reconfigure command to described RNS;
RNS is eating dishes without rice or wine to issue switching command to switching user terminal;
User terminal is eating dishes without rice or wine to initiate access to the 2G target base station controller;
After inserting successfully, switch the Radio Resource that preceding this user terminal takies in the 3G Radio Network System by the MSC/MSC Server release of 3G network.
According to said method of the present invention, behind the cell ID discriminator and MNC conversion that the MSC/MSC Server of 3G network realizes comprising in the cell ID,, then carry out the following step if judge the subordinate base station that the 2G target base station controller is not a this exchange:
The MSC/MSC Server of 3G network is the handoff request message packing of the 2G network that sends, sends to mobile switching centre under the 2G target base station controller by E interface;
Mobile switching centre under the 2G target base station controller initiates handoff request to described 2G target base station controller;
By Signalling exchange, set up the speech channel between the mobile switching centre under the MSC/MSC Server of 3G network and the 2G target base station controller after, realize calling out and switch.
The cell ID discriminator that comprises in the cell ID of described handover source sub-district is a Service Area Identifier SAI binary code 1011; The cell ID discriminator that described target BS can be discerned is a Cell Global Identity CGI binary code 0000.
Beneficial effect of the present invention is as follows:
(1) adopt the inventive method, upgrading can not done to existing 2G MSC/BSC by operator, just can realize the successful switch from the 3G network system to the 2G network system, realizes that cost is low.
(2) adopt the inventive method can guarantee the successful switch of user between two networks, make user's communication uninterrupted, improved user's satisfaction.
(3) the present invention has improved the competitiveness of 3G network, especially at the first stage of construction of 3G network, can fully use the good resource of existing 2G network, for the user provides effective service.
Description of drawings
Fig. 1 is the switching flow figure of intra-office from the UMTS system to gsm system;
Fig. 2 is the switching flow figure of interoffice from the UMTS system to gsm system.
Embodiment
The present invention is applied to the switching to the 2G network system from the 3G network system, in switching flow, by mobile switching centre in the 3G network system (MSC/MSC Server) or radio network controller (RNC), protocol version according to 2G target mobile switching centre that will switch to and base station controller support, the cell ID discriminator that comprises in the cell ID with the handover source sub-district is converted to the cell ID discriminator that 2G target mobile switching centre and base station controller can be discerned.
If the mobile network network No. (MNC) in the 3G network system is inequality with the MNC in the 2G network system, then by the MNC that comprises in the MSC/MSC Server of described 3G network or the cell ID of RNC, convert the MNC of mobile network under 2G target mobile switching centre and the base station controller to the handover source sub-district.
Switching to gsm system with the UMTS system below is example, and concrete switching flow is described in detail.
Referring to Fig. 1, be the switching flow figure of same intra-exchange from the UMTS system to gsm system, to carry out cell ID with MSC and be converted to example, its idiographic flow comprises:
Step 1, user terminal make a call under 3G network, RNS RNS-A reports reconfiguration request (Iu-Relocation-Required) by the Iu interface to the 3G_MSC-A of mobile switching centre of 3G network in the time will switching, require 3G_MSC-A to switch, in this reconfiguration request message, carry the cell ID of user terminal handover source sub-district; The cell ID discriminator that cell ID comprises is a Service Area Identifier (SAI) 1011
Binary systemWith mobile network network No. MNC;
After step 2,3G_MSC-A receive the reconfiguration request that RNS-A reports, cell ID discriminator (SAI) and mobile network network No. (MNC) with comprising in the described cell ID are converted to the cell ID discriminator (as: Cell Global Identity 0000 that 2G target mobile switching centre and base station controller can be discerned respectively
Binary system) and 2G target mobile switching centre and base station controller under the MNC of mobile network;
Concrete conversion method can for:
Data table memory in the 3G_MSC-A of 3G network, in described tables of data, comprise: the protocol version information that 2G target mobile switching centre and base station controller are supported, and support the 2G target mobile switching centre of diversity of protocol versions and the cell ID discriminator that base station controller can be discerned;
2G target mobile switching centre and base station controller that 3G_MSC-A switches according to request are inquired about described tables of data, obtain the cell ID discriminator that 2G target mobile switching centre and base station controller can be discerned; Equally, also can in the 3G_MSC-A of 3G network, store the mapping table of 2G base station and affiliated mobile network network No. thereof; 2G target mobile switching centre and base station controller that 3G_MSC-A switches according to request are inquired about described mapping table, obtain the MNC of the affiliated mobile network of 2G target mobile switching centre and base station controller;
If it is that (as if target base station controller is not subordinate's base station controller of this exchange to the 2G base station controller that belongs to this exchange that 3G_MSC-A judges the 2G target base station controller, then carry out flow process shown in Figure 2, be described in detail hereinafter), the reconfiguration request of initiating according to RNS-A then, produce 2G handoff request (A-Handover-Request), send to 2G target base station controller BSS-B by the A interface, require target base station controller BSS-B to prepare Radio Resource for the user UE/MS that will switch; In this 2G handoff request message, carry the cell ID that carries out cell ID discriminator and MNC conversion;
Step 3, target base station controller BSS-B return acknowledge message (A-Handover-Request-Ack) to 3G_MSC-A after finishing the Radio Resource preparation;
Step 4,3G_MSC-A issue reprovision order (Iu-Relocation-Command) to RNS-A;
Step 5, RNA-A eat dishes without rice or wine to issue switching command (RRC-HO-Command), require user terminal to be linked on the target base station controller BSS-B from source RNS-A;
Step 6, user terminal (UE/MS) are eating dishes without rice or wine to report switching to insert message (RI-HO-Access), and the expression user terminal is attempted inserting to target base station controller BSS-B;
Step 7, BSS-B send switching detection message to 3G_MSC-A, and expression has detected user terminal and inserted;
Step 8, user terminal are eating dishes without rice or wine to report the switching access to finish message (RI-HO-Complete), and the expression user terminal successfully inserts target base station controller BSS-B;
Step 9, target base station controller BSS-B send handoff completion message to 3G_MSC-A, notice 3G_MSC-A, the user terminal handover success that request is switched;
Step 10,3G_MSC-A issue release command (Iu-Release-Command) and give RNS-A, notify it to discharge the Radio Resource that original conversation takies;
After step 11, RNS-A release Radio Resource are finished, return the resource Release complete to 3G_MSC-A.
So far, complete successfully once handoff procedure from the UMTS system of 3G to the gsm system of 2G.
When Fig. 2 was not subordinate's the base station controller of this exchange for target base station controller, the switching flow figure from the UMTS system to gsm system comprised following idiographic flow:
RNS RNS-A under step 1, the user terminal reports reconfiguration request (Iu-Relocation-Required) by the Iu interface, requires 3G_MSC-A to switch;
After step 2,3G_MSC-A receive the reconfiguration request that RNS-A reports, with cell ID discriminator (SAI) and the MNC that comprises in the described cell ID, be converted to the MNC of mobile network under cell ID discriminator (CGI) that 2G target mobile switching centre and base station controller can discern and 2G target mobile switching centre and the base station controller respectively;
3G_MSC-A produces 2G handoff request message (A-Handover-Request) according to reconfiguration request, carries the cell ID that has carried out cell ID discriminator and MNC conversion in this message; And on E interface, this handoff request message is packed, generate the preparation handoff request message (MAP-Prep-Handover req.) of a MAP form, send to the affiliated moving exchanging center MSC-B of target base station controller;
After step 3, MSC-B receive MAP-Prep-Handover req. message,,, be IAM (initial address message) and prepare so that set up 3G MSC-A to the speech channel between the MSC-B to Visited Location Registor VLR-B application Handover Number;
Step 4, MSC-B send handoff request message (A-Handover-Request) and give target base station controller BSS-B, require its user (UE/MS) who is request is switched to prepare Radio Resource;
Step 5, target base station controller BSS-B return acknowledge message (A-Handover-Request-ACK) to 3G_MSC-A after finishing the Radio Resource preparation;
Step 6, Visited Location Registor VLR-B send Handover Number report request (MAP-Send-Handover-Number-Report req.) to MSC-B, after MSC-B receives the Handover Number and A-Handover-Request-ACK message that VLR-B distributes, construct one together and prepare switching response message (MAP-Prep-Handover resp.);
Step 7, MSC-B are by MAP-Prep-Handover resp. message informing 3G_MSC-A, all set Radio Resource and Handover Number;
Step 8,3G_MSC-A analyze the Handover Number that MSC-B returns, and set up two speech channels between MSC, send initial address message (IAM) and give MSC-B;
Step 9, MSC-B send Handover Number release message (MAP-Send-Handover-Number-Report resp.) for Visited Location Registor VLR-B, discharge the Handover Number that application distributes, and use when asking to switch for other users;
Step 10, MSC-B go back to the address to 3G_MSC-A and finish message, show that two speech channels between MSC have finished foundation;
Step 11,3G_MSC-A issue reprovision order (Iu-Relocation-Command) to RNS-A; Require user terminal to be linked on the target base station controller BSS-B from source RNS-A;
Step 12, user terminal are after eating dishes without rice or wine to report switching to insert message, and BSS-B sends switching detection message (A-Handover-Detect) to MSC-B, and notice MSC-B has detected user terminal and inserted;
Step 13, MSC-B give 3G_MSC-A the A-Handover-Detect forwards by inserting processing signaling (MAP-Process-Access-Signal Req.), notice 3G_MSC-A, and user terminal is prepared from the 2G network insertion;
After step 14, user terminal inserted the 2G network, BSS-B sent handoff completion message (A-Handover-Complete) to MSC-B, and notice MSC-B user terminal successfully inserts;
Step 15, MSC-B give 3G_MSC-A the A-Handover-Complete forwards by sending end signaling (MAP-Send-End-Signal Req.), notice 3G_MSC-A, and user terminal has successfully inserted the 2G network;
Step 16,3G_MSC-A issue release command (Iu-Release-Command) and give RNS-A, notify it to discharge the Radio Resource that original conversation takies;
Step 17, RNS-A report Release complete (Iu-Release-Complete), and the Radio Resource that the original conversation of notice 3G_MSC-A takies is released;
Step 18, MSC-B notify 3G_MSC-A to switch on trunk interface and finish (ANSWER message), to keep the complete of relaying signaling with front ACM;
When step 19, end of calling, 3G_MSC-A is to the release (RELEASE message) of MSC-B notice interoffice speech channel;
Step 20,3G_MSC-A send to MSC-B and finish signaling response message (MAP-Send-End-Signal resp.), and notice MSC-B discharges the Radio Resource of application when switching.
By step 1-20 shown in Figure 2, finish the inter-office switchover process of user terminal from the UMTS system of 3G to the gsm system of 2G.
In above-mentioned Fig. 1 and Fig. 2 flow process, be to realize that with mobile switching centre (MSC/MSC Server) the cell ID discriminator and the mobile network network No. that comprise in the cell ID are converted to example.According to identical transformation rule, the network entity of specific implementation conversion can be radio network controller (RNC).
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. inter-system switching method, be applied to of the switching of 3G network system to the 2G network system, it is characterized in that, in switching flow, by the mobile switching centre in the 3G network system/mobile swap server MSC/MSC Server or radio network controller (RNC), protocol version according to 2G target mobile switching centre that will switch to and base station controller support, the cell ID discriminator that comprises in the cell ID with the handover source sub-district is converted to the cell ID discriminator that described 2G target mobile switching centre and base station controller can be discerned; And
When if mobile network network No. MNC in the 3G network system and the MNC in the 2G network system are also inequality, 2G target mobile switching centre and base station controller that the MSC/MSC Server of described 3G network or RNC switch according to request, inquire about the 2G target mobile switching centre that stores among the MSC/MSC Server of described 3G network or the RNC and the mapping table of base station controller and affiliated mobile network thereof, obtain the MNC of mobile network under 2G target mobile switching centre and the base station controller, the MNC that comprises in the cell ID with the handover source sub-district converts the MNC of mobile network under 2G target mobile switching centre and the base station controller to.
2. the method for claim 1 is characterized in that, stores tables of data among the MSC/MSC Server of described 3G network or the RNC;
Comprise in the described tables of data: the protocol version information that 2G target mobile switching centre and base station controller are supported, and support the 2G target mobile switching centre of diversity of protocol versions and the cell ID discriminator that base station controller can be discerned;
In switching flow, 2G target mobile switching centre and base station controller that MSC/MSC Server or RNC switch according to request are inquired about described tables of data, obtain the cell ID discriminator that 2G target mobile switching centre and base station controller can be discerned.
3. the method for claim 1 is characterized in that, the conversion as if realized described cell ID discriminator and MNC by MSC/MSC Server comprises the steps:
The RNS RNS at the user terminal place that request is switched reports reconfiguration request by the Iu interface to the MSC/MSC of described 3G network Server, carries the cell ID of user terminal handover source sub-district;
After the MSC/MSC Server of 3G network receives the reconfiguration request that RNS reports, with cell ID discriminator and the MNC that comprises in the described cell ID, be converted to the MNC of mobile network under cell ID discriminator that 2G target mobile switching centre and base station controller can discern and 2G target mobile switching centre and the base station controller respectively;
If it is the 2G base station controller that belongs to this exchange that the MSC/MSC Server of 3G network judges described 2G target base station controller, then send the handoff request message of a 2G network to the 2G target base station controller by the A interface, carry the cell ID that carries out cell ID discriminator and MNC conversion, carry out switching flow.
4. method as claimed in claim 3 is characterized in that, described switching flow comprises:
The 2G target base station controller returns handoff request acknowledgment message to the MSC/MSC of 3G network Server;
The MSC/MSC Server of 3G network issues reconfigure command to described RNS;
RNS is eating dishes without rice or wine to issue switching command to switching user terminal;
User terminal is eating dishes without rice or wine to initiate access to the 2G target base station controller;
After inserting successfully, switch the Radio Resource that preceding this user terminal takies in the 3G Radio Network System by the MSC/MSC Server release of 3G network.
5. method as claimed in claim 3, it is characterized in that, behind the cell ID discriminator and MNC conversion that the MSC/MSC Server of 3G network realizes comprising in the cell ID,, then carry out the following step if judge the subordinate base station that the 2G target base station controller is not a this exchange:
The MSC/MSC Server of 3G network is the handoff request message packing of the 2G network that sends, sends to mobile switching centre under the 2G target base station controller by E interface;
Mobile switching centre under the 2G target base station controller initiates handoff request to described 2G target base station controller;
By Signalling exchange, set up the speech channel between the mobile switching centre under the MSC/MSC Server of 3G network and the 2G target base station controller after, realize calling out and switch.
6. as the arbitrary described method of claim 1-5, it is characterized in that the cell ID discriminator that comprises in the cell ID of described handover source sub-district is a Service Area Identifier SAI binary code 1011; The cell ID discriminator that described target BS can be discerned is a Cell Global Identity CGI binary code 0000.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100827000A CN100461946C (en) | 2005-07-08 | 2005-07-08 | Method of switching-over between systems |
| EP06753123A EP1903817B1 (en) | 2005-07-08 | 2006-07-07 | Method of inter-system handover |
| AT06753123T ATE510432T1 (en) | 2005-07-08 | 2006-07-07 | METHOD FOR HANDOVER BETWEEN SYSTEMS |
| PCT/CN2006/001609 WO2007006217A1 (en) | 2005-07-08 | 2006-07-07 | Method of inter-system handover |
| US11/969,004 US8229438B2 (en) | 2005-07-08 | 2008-01-03 | Method for inter-system handover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100827000A CN100461946C (en) | 2005-07-08 | 2005-07-08 | Method of switching-over between systems |
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| CN1893720A CN1893720A (en) | 2007-01-10 |
| CN100461946C true CN100461946C (en) | 2009-02-11 |
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| CNB2005100827000A Expired - Fee Related CN100461946C (en) | 2005-07-08 | 2005-07-08 | Method of switching-over between systems |
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| CN102742349B (en) * | 2009-12-15 | 2015-06-10 | 无线未来科技公司 | Methods and apparatuses for supporting for handover |
| CN104780575A (en) * | 2009-12-15 | 2015-07-15 | 无线未来科技公司 | User equipment switching supporting method used in target base station and target base station |
| CN104780576A (en) * | 2009-12-15 | 2015-07-15 | 无线未来科技公司 | Method for switching source base station to target base station and user equipment |
| CN104780575B (en) * | 2009-12-15 | 2018-10-16 | 无线未来科技公司 | Method, source base station and target BS for supporting user equipment to switch |
| CN104780576B (en) * | 2009-12-15 | 2018-10-23 | 无线未来科技公司 | The method and user equipment of target BS are switched to from source base station |
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| CN1893720A (en) | 2007-01-10 |
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