CN101594649B - Call-establishing method and switching method - Google Patents
Call-establishing method and switching method Download PDFInfo
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- CN101594649B CN101594649B CN2008100987963A CN200810098796A CN101594649B CN 101594649 B CN101594649 B CN 101594649B CN 2008100987963 A CN2008100987963 A CN 2008100987963A CN 200810098796 A CN200810098796 A CN 200810098796A CN 101594649 B CN101594649 B CN 101594649B
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Abstract
The invention discloses a call-establishing method for call connection between a mobile switching center server and a base station controller. An interface between the base station controller and the mobile switching center server is based on an IP bearing. The call-establishing method comprises the following steps: the base station controller receives a call-establishing request of a terminal, sends out the call-establishing request to the mobile switching center server and carries an call identifier marking the call in the call-establishing request or the mobile switching center server sends out an assigning request to the base station controller and carries the call identifier marking the call in the assigning request, and the call identifier has information for marking the call. The invention also discloses a switching method. The invention solves the problem of call incapability by an interface between the mobile switching center server and the base station controller based on the IP bearing and realizes the call-establishing process and the switching process between a mobile switching center and the base station controller.
Description
Technical field
The present invention relates to the communications field, be specifically related to call-establishing method and changing method.
Background technology
At existing global system for mobile communications (Global System for MobileCommunications; Abbreviate GSM as) in, mobile switching centre's (Mobile SwitchingCenter abbreviates MSC as) and base station controller (Base Station Controller; Abbreviate BSC as) between adopt the A interface to carry out communication; Wherein, the A interface is based on that time division multiplexing (Time Division Multiple abbreviates TDM as) carries; Transmission is pulse code modulation (Pulse Code Modulation abbreviates PCM as) the speech coding signal of 64Kbps above that.
Among the GSM, adopt air interface Um to carry out communication between portable terminal (Mobile Station abbreviates MS as) and the base station (BaseStation abbreviates BTS as), wherein, what Um Interface transmitted is the compressed voice code signal; Adopt Abis interface to carry out communication between BTS and the BSC, wherein, Abis interface is based on that TDM carries, and transmission is the compressed voice code signal identical with Um Interface above that.
Wherein, BSC has code conversion and rate adaptation function (Transcode RateAdaption Unit; Abbreviate TRAU as); And this function realizes by codec unit (Transcoder abbreviates TC as), accomplishes the conversion of the PCM speech coding of the 64Kbps that transmits in the compressed voice coding that transmits in the Abis interface and the A interface through TC.
Development along with the third generation mobile system; Behind 3GPP release 4, core net has realized separating of control and carrying, and MSC resolves into two functional entitys: Mobile Switching Center Server (Mobile Switching Center Server; Abbreviate MSC Server as) and WMG (Media Gateway; Abbreviate MGW as), the interface between the two is a Mc interface, MSC Server accomplishes the control to MGW through Mc interface.Wherein, MSC Server mainly is used for accomplishing the control to signaling and calling; MGW mainly provides service bearer, and MGW can be used as the destination node processing from the Bearer Channel of Circuit Switching Network or the data flow of Packet Based Network, the conversion of MGW support media, carrying control and load processing; As carry out encoding and decoding, echo and suppress conference etc.
Along with the application of Internet protocol (Internet Protocol abbreviates IP as) technology in wireless network, the A interface progressively adopts based on IP and carries (A Interface Over IP abbreviates AoIP as).As shown in Figure 1; Under the situation that the A interface carries based on IP; The gsm communication network comprises: portable terminal 60, base station 50, base station controller 20, WMG 30, Mobile Switching Center Server 10, and the Mc interface between the A interface between the Abis interface between the Um Interface between portable terminal 60 and the base station 50, base station 50 and the base station controller 20, base station controller 20 and WMG 30 and the Mobile Switching Center Server 10, Mobile Switching Center Server 10 and the WMG 30.
After introducing the IP carrying; Circuit identification code (the Circuit Identifier Code that is used to identify certain specific call in the BSSMAP message when carrying based on TDM in the prior art; Abbreviate CIC as) will no longer be applicable to AoIP, because existing C IC sign is certain time slot of certain pulse code modulation (Pulse Code Modulate abbreviates PCM as) link; And the A interface among the AoIP does not have PCM to carry, and can't realize the calling between wireless network and the core net.
Summary of the invention
Consider the problem that to call out when the Mobile Switching Center Server that exists in the correlation technique and the interface between the base station controller carry based on IP and propose the present invention; For this reason; Main purpose of the present invention is to provide call-establishing method and changing method, to address the above problem.
According to an aspect of the present invention, a kind of call-establishing method is provided, this method is used for Mobile Switching Center Server and is connected with calling between the base station controller, and wherein, the interface between base station controller and the Mobile Switching Center Server carries based on IP.
Call-establishing method according to the embodiment of the invention comprises: after base station controller receives the setup requests at terminal; Send setup requests to Mobile Switching Center Server, and in setup requests, carry the call identifier that this calling takes place sign; Perhaps Mobile Switching Center Server sends assignment request to base station controller, and in assignment request, carries the call identifier that this calling takes place sign; Wherein, call identifier has the identification information that is used to identify this calling.
Wherein, base station controller is before Mobile Switching Center Server sends setup requests, and method also comprises: base station controller carries out internal algorithm to self information to be handled, and obtains the call identifier that it carries in setup requests.
Preferably, it is one of following that the processing that obtains call identifier comprises: with the IP address and the UDP port numbers of base station controller is the udp port addition, obtains call identifier; With the internal module identifier of base station controller as call identifier; Any serial number that base station controller is inner is as call identifier.
Wherein, Mobile Switching Center Server is before base station controller sends assignment request, and method also comprises: Mobile Switching Center Server carries out internal algorithm to self information to be handled, and obtains the call identifier that it carries in assignment request.
Preferably, it is one of following that the processing that obtains call identifier comprises: IP address and udp port addition with Mobile Switching Center Server obtain call identifier; With the internal module identifier of Mobile Switching Center Server as call identifier; Any serial number that Mobile Switching Center Server is inner is as call identifier.
Preferably, said identification information takies a plurality of bits, and utilize the most significant bit of the identification information of said a plurality of bits identify said identification information be distribute by said base station controller or distribute by said Mobile Switching Center Server.
According to an aspect of the present invention, a kind of changing method is provided, this method is used for the terminal and between the different districts of same base station controller, switches.
Call-establishing method according to the embodiment of the invention comprises: after base station controller is received the inside handoff request of Mobile Switching Center Server transmission; Send internal switching consulting to said Mobile Switching Center Server, and in said internal switching consulting, carry and be used for sign and this takes place switch to call identifier.
Wherein, the base station controller of base station is before Mobile Switching Center Server sends internal switching consulting, and method also comprises: base station controller carries out internal algorithm to self information to be handled, and obtains call identifier.
Preferably, it is one of following that the processing that obtains call identifier comprises: IP address and udp port addition with base station controller obtain call identifier; With the internal module identifier of base station controller as call identifier; Any serial number that base station controller is inner is as call identifier.
Through at least one technical scheme of the present invention, realized the call establishment when interface between Mobile Switching Center Server and the base station controller carries based on IP.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the schematic network structure of GSM communication system under the AoIP situation according to correlation technique;
Fig. 2 is the structural representation according to the AoIP call identifier of the embodiment of the invention;
Fig. 3 is the flow chart of the preferred embodiment one of the call-establishing method according to the present invention;
Fig. 4 is according to the AoIP call identifier of the embodiment of the invention one structural representation as the expansion cell when the call setup;
Fig. 5 is the flow chart of the preferred embodiment two of the call-establishing method according to the present invention;
Fig. 6 is according to the AoIP call identifier of the embodiment of the invention two structural representation as the expansion cell when the call setup;
Fig. 7 is the flow chart according to the changing method of the inventive method embodiment;
Fig. 8 is the flow chart of the preferred embodiment three of the changing method according to the present invention;
Fig. 9 is the structural representation according to AoIP call identifier conduct expansion cell in handoff procedure of the embodiment of the invention three.
Embodiment
According to the embodiment of the invention, a kind of call-establishing method is provided.
The embodiment of the invention provides a kind of call-establishing method; Being used for Mobile Switching Center Server (MSC.Server) is connected with calling between the base station controller (BSC); Wherein, the interface between base station controller and the Mobile Switching Center Server carries based on IP, and this method comprises: after base station controller receives the setup requests at terminal; Send setup requests to Mobile Switching Center Server, and in setup requests, carry the call identifier that this calling takes place sign; Perhaps, Mobile Switching Center Server sends assignment request to base station controller, and in assignment request, carries the call identifier that this calling takes place sign; Wherein, call identifier has and is used to identify this call identification information.
Through the technical scheme that the embodiment of the invention provides, realized the call establishment when interface between Mobile Switching Center Server and the base station controller carries based on IP.
Wherein, above-mentioned base station controller also comprised before Mobile Switching Center Server sends setup requests: base station controller carries out internal algorithm to self information to be handled, and obtains the call identifier that it carries in setup requests.
Preferably, it is one of following that the processing that obtains call identifier comprises: IP address and UDP (User Datagram Protocol abbreviates UDP as) port numbers addition with base station controller obtain call identifier; With the internal module identifier of base station controller as call identifier; Any serial number that base station controller is inner is as call identifier.
Wherein, Mobile Switching Center Server also comprised before base station controller sends assignment request: Mobile Switching Center Server carries out internal algorithm to self information to be handled, and obtains the call identifier that it carries in assignment request.
Preferably, it is one of following that the processing that obtains call identifier comprises: IP address and udp port addition with Mobile Switching Center Server obtain call identifier; With the internal module identifier of Mobile Switching Center Server as call identifier; Any serial number that Mobile Switching Center Server is inner is as call identifier.
Preferably, above-mentioned identification information takies a plurality of bits, and utilize the most significant bit of the identification information of said a plurality of bits identify said identification information be distribute by said base station controller or distribute by said Mobile Switching Center Server.
Need to prove that Fig. 2 shows the definition of AoIP call identifier cell, and is as shown in Figure 2, this cell can adopt 3 bytes (eight hytes) to identify.Wherein, most significant bit is used to indicate the distribution body of call identifier, can utilize any one in 3 bytes to represent this identification information.For example, can utilize the highest-order bit to represent that this AoIP call identifier is to be distributed by BSC, is still distributed by MSC Server; If highest order is " | 0 ", expression is distributed by BSC, and highest order is " 1 "; Expression is distributed by MSC Server, also can represent conversely.So just can guarantee that by the AoIP call identifier that BSC and MSC Server distribute be that the overall situation is unique.
Embodiment one
Fig. 3 is the detailed process flow chart according to the call-establishing method of the inventive method embodiment, and is as shown in Figure 3, and this method may further comprise the steps:
Step S302, the terminal request of making a call sends to BTS (base station) with the complete layer of CM_Service_Request 3 message, and BTS gives BSC with the complete layer of CM_Service_Request 3 forwards.
Step S304; After BSC receives the complete layer of CM_Service_Request 3 message; Handle through internal algorithm, obtain the unique AoIP call identifier of the overall situation, this AoIP call identifier that BSC will generate is put into CM_Service_Request layer 3 message fully; The CM_Service_Request that is expanded is layer 3 message (being setup requests mentioned above) fully; And sending it to MSC Server, MSC Server receives the complete layer of CM_Service_Request 3 message of this expansion, obtains about this AoIP call identifier;
Step S306, MSC Server sends assignment request message and gives BSC;
Step S308, BSC send to assign and accomplish message to MSC Server.
Need to prove; Send in the complete layer of CM_Service_Request 3 message of MSC at BSC; This AoIP call identifier is as shown in Figure 4 as the message structure of expansion cell in the complete layer of CM_Service_Request 3 message; Can expand a cell that is called " AoIP CallIdentifier (being the AoIP call identifier) " in layer 3 message fully at this CM_Service_Request, the definition of this AoIP Call Identifier cell is as shown in Figure 2, repeats no more here.
Wherein, BSC carries out the internal algorithm processing to self information in step S204; Obtain the unique AoIP call identifier of the overall situation; The mode that obtains this AoIP call identifier can comprise multiple, for example, can choose with the IP address of BSC and udp port addition and as the AoIP call identifier; The combination of identifier of internal module that also can adopt the inner distinct device relevant with this AoIP calling of BSC is as the AoIP call identifier; Can also adopt an inner serial number of BSC as the AoIP call identifier.
Embodiment two
Fig. 5 is the detailed process flow chart according to the call-establishing method of the inventive method embodiment, and is as shown in Figure 5, and this method may further comprise the steps:
Step S502, MSC Server handle through internal algorithm and obtain the unique call identifier (AoIP identifier) of the overall situation;
Step S504, MSC Server puts into assignment request with the AoIP call identifier that generates and sends to BSC, and BSC has just obtained this AoIP call identification after receiving this assignment request;
Step S506, in response to above-mentioned assignment request, BSC sends to MSC Server with the assignment request response.
Need to prove; Send in the assignment request of BSC at MSC; This AoIP call identifier is as shown in Figure 6 as the message structure of expansion cell in assignment request; The cell of expansion one " AoIP Call Identifier (being the AoIP call identifier) " by name in this assignment request, the definition of this AoIP Call Identifier cell is as shown in Figure 2, repeats no more here.
Wherein, MSC Server carries out the internal algorithm processing to self information in step S502; Obtain the unique AoIP call identifier of the overall situation; The mode that obtains this AoIP call identifier can comprise multiple, for example, can choose with the IP address of MSC Server and udp port addition and as the AoIP call identifier; The combination of identifier of internal module that also can adopt the inner distinct device relevant with this AoIP calling of MSC Server is as the AoIP call identifier; Can also adopt an inner serial number of MSC Server as the AoIP call identifier.
According to the embodiment of the invention, a kind of changing method is provided also.
Fig. 7 is the flow chart according to the changing method of the embodiment of the invention, and is as shown in Figure 7, and this method is used for the terminal to be switched between the different districts of same base station controller, may further comprise the steps:
Step S702, base station controller send internal switching consulting to Mobile Switching Center Server after receiving the inside handoff request that Mobile Switching Center Server sends, and in this internal switching consulting, carry and be used for sign and this takes place switch to call identifier;
Step S704, Mobile Switching Center Server receive said internal switching consulting, obtain identifying the call identifier that this switching takes place.
Wherein, in step S702, base station controller carries out internal algorithm to self information to be handled, and obtains call identifier.
Preferably, in step S702, it is one of following that the processing that obtains call identifier comprises: IP address and udp port addition with base station controller obtain call identifier; With the internal module identifier of base station controller as call identifier; Any serial number that base station controller is inner is as call identifier.
Through the technical scheme that the embodiment of the invention provides, when having realized that interface between Mobile Switching Center Server and the base station controller carries based on IP, the handoff procedure between the different districts of same base station controller.
Embodiment three
Fig. 8 is the detailed process flow chart according to the changing method of the inventive method embodiment, and is as shown in Figure 8, and this method may further comprise the steps:
After step S802, BSC receive the inside handoff request of MSC Server transmission, handle, obtain the unique AoIP call identifier of the overall situation through internal algorithm;
Step S804, BSC put into the AoIP call identifier that obtains to switch and prepare message (being internal switching consulting mentioned above), should switch preparation message and send to MSCServer;
Step S806, MSC Server have just obtained identifying the AoIP call identifier that this switching takes place after receiving this switching preparation message.
Need to prove; The switching that sends to MSC at BSC is prepared in the message; This AoIP call identifier is as shown in Figure 9 as the message structure of expansion cell in switching preparation message; The cell of expansion one " AoIP Call Identifier (being the AoIP call identifier) " by name in this inside handoff request, the definition of this AoIP Call Identifier cell is as shown in Figure 2, repeats no more here.
Wherein, BSC carries out internal algorithm to self information and handles in step S802, and to obtain the mode of this AoIP call identifier identical for BSC among the mode that obtains the unique AoIP call identifier of the overall situation and the embodiment one, no longer is repeated in this description here.
As above; By means of call-establishing method provided by the invention and/or changing method; Solved when interface between Mobile Switching Center Server and the base station controller carries based on IP and can't call out, realized call establishment and handoff procedure between Mobile Switching Center Server and the base station controller.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. call-establishing method is used for base station controller and is connected with calling between the Mobile Switching Center Server, and wherein, the interface between said base station controller and said Mobile Switching Center Server carries based on IP, it is characterized in that, said method comprises:
After said base station controller receives the setup requests at terminal, send said setup requests, and in said setup requests, carry the call identifier that this calling takes place sign to said Mobile Switching Center Server; Perhaps
Said Mobile Switching Center Server sends assignment request to said base station controller, and in said assignment request, carries the call identifier that this calling takes place sign;
Wherein, said call identifier has the identification information of the said calling of sign.
2. method according to claim 1 is characterized in that, said base station controller is before said Mobile Switching Center Server sends said setup requests, and said method also comprises:
Said base station controller carries out internal algorithm to self information to be handled, and obtains the said call identifier that it carries in said setup requests.
3. method according to claim 2 is characterized in that, it is one of following that the processing that obtains said call identifier comprises:
With the IP address and the UDP port numbers of said base station controller is the udp port addition, obtains said call identifier;
With the internal module identifier of said base station controller as said call identifier;
Any serial number that said base station controller is inner is as said call identifier.
4. method according to claim 1 is characterized in that, said Mobile Switching Center Server is before said base station controller sends said assignment request, and said method also comprises:
Said Mobile Switching Center Server carries out internal algorithm to self information to be handled, and obtains the said call identifier that it carries in said assignment request.
5. method according to claim 4 is characterized in that, it is one of following that the processing that obtains said call identifier comprises:
IP address and udp port addition with said Mobile Switching Center Server obtain said call identifier;
With the internal module identifier of said Mobile Switching Center Server as said call identifier;
Any serial number that said Mobile Switching Center Server is inner is as said call identifier.
6. according to each described method among the claim 1-5; It is characterized in that; Said identification information takies a plurality of bits, and utilize the most significant bit of the identification information of said a plurality of bits identify said identification information be distribute by said base station controller or distribute by said Mobile Switching Center Server.
7. a changing method is used for the terminal and between the different districts of same base station controller, switches, and wherein, the interface between Mobile Switching Center Server and the base station controller carries based on IP, it is characterized in that, said method comprises:
Base station controller sends internal switching consulting to said Mobile Switching Center Server after receiving the inside handoff request that Mobile Switching Center Server sends, and in said internal switching consulting, carries and be used for sign and this takes place switch to call identifier.
8. method according to claim 7 is characterized in that, said base station controller is before Mobile Switching Center Server sends internal switching consulting, and said method also comprises:
Said base station controller carries out internal algorithm to self information to be handled, and obtains said call identifier.
9. method according to claim 8 is characterized in that, it is one of following that the processing that obtains said call identifier comprises:
IP address and udp port addition with said base station controller obtain said call identifier;
With the internal module identifier of said base station controller as said call identifier;
Any serial number that said base station controller is inner is as said call identifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100987963A CN101594649B (en) | 2008-05-30 | 2008-05-30 | Call-establishing method and switching method |
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| CN2008100987963A CN101594649B (en) | 2008-05-30 | 2008-05-30 | Call-establishing method and switching method |
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| CN101594649A CN101594649A (en) | 2009-12-02 |
| CN101594649B true CN101594649B (en) | 2012-11-28 |
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Effective date of registration: 20200123 Address after: 4819 emperor Avenue, Triangle Park Research Center, Durham, Delaware, USA Patentee after: Open Invention Network Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong high tech Industrial Park, ZTE building Patentee before: ZTE Corp. |
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