CN101237603B - A method and system for realizing IP interface between GSM wireless network and core network - Google Patents
A method and system for realizing IP interface between GSM wireless network and core network Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for realizing IP-based interface between a GSM wireless network and a core network, comprising the following steps: (A) a mobile switching center (MSC) server, which receives a calling request carrying self-support code pattern and transmitted by a mobile station (MS), establishes a code pattern precedence table according to a calling request message and sends an endpoint adding message to the wireless side of a medium gateway MGW; (B) the MSC server receives the response message which contains the IP address and the port number allocated by the MGW for a calling and is returned from the MGW wireless side, and sends an assignment message to a BSC; the BSC receives the assignment message; moreover, corresponding IP carrier is established and code pattern negotiation is carried out. The embodiment of the invention also discloses a system used to realize IP-based interface between a GSM wireless network and a core network. The method and the system can avoid quality degradation and transmission time delay caused by multiple speech codings, and save TC resource and transmission resource.
Description
Technical field
The present invention relates to GSM networking interfacing, particularly a kind of method and system that realize gsm wireless net and core net interface IPization.
Background technology
Gsm system (GSM, Global System for Mobile Communication) claim global system for mobile communications (Global Link) again, according to third generation collaboration items (3GPP; Third Generation Partnership Project) gsm system of normal structure definition is mainly by mobile switching subsystem (MSS, Mobile Switching Subsystem), base station sub-system (BSS; Base Station Subsystem) and travelling carriage (MS, Mobile Station) three parts form, Fig. 1 is existing GSM network architecture sketch map; As shown in Figure 1, this system comprises: MSS, BSS and MS, wherein; MSS accomplishes the main function of exchange of GSM; Simultaneously leading subscriber data and the required database of mobility are managed communicating by letter between communication and GSM mobile subscriber and other communication network user between the GSM mobile subscriber, comprise (the MSC of mobile switching centre; Mobile Switching Center) server and WMG (MGW; Media GateWay), BSS comprises base station controller (BSC, Base Station Controller) and base station transceiver (BTS; Base Transceiver Station); BSC is towards wireless network, mainly be responsible for wireless network, RRM and calling and called MS and calling and called side BTS wireless connections foundation, continue and release management, functions such as speech coding, code conversion and rate adapted are provided.BTS accomplishes the conversion between BSC and the wireless channel, realizes between BTS and the MS through the wireless transmission of air interface and relevant controlled function.
Interface is an Abis interface between BTS and the BSC, adopts the coding and the speed adjustment (TRAU of time division multiplexing (TDM, Time-Division Multiplexing); Transcoder and Rate Adaption Unit) protocol frame transmits GSM voice-and-data message, and each TRAU passage occupies the 16K bandwidth; The coded format of voice has half rate (HR; Half Rate), full rate (FR, Full Rate) and EFR (EFR, Enhanced Full Rate) coding.Interface between BSS and the MSC server is the A interface, and the A interface between BSC and the MGW adopts G.711 protocol mode transferring voice and the data of TDM, and coded system is for G.711, and the calling of every road takies the bandwidth of 64Kbps.
In the MSS side, MSC server and MGW adopt the carrying control separate mode of 3GPP R4, all signaling control parts; Be responsible for processing by the MSC server, processing is responsible for by MGW in all bearing parts; Adopt Nb interface between MGW and the MGW, coded system is generally AMR (AMR, Adaptive Multi-Rate) coding; Utilize Internet protocol (IP, Internet Protocol) transmission means to improve efficiency of transmission, save bandwidth.Adopt Nc interface between MSC server and the MGW; Adopt the A interface between MSC server and the BSC, through transmitting Base Station System Application Part (BSSAP, Base Station Subsystem Application Part) signaling; Be used to carry user's connection request; Cut off message such as connection, after BSC handles, deliver to BTS, BSSAP message is defined by standard GSM08.08.Adopt Nc interface between MSC server and the MSC server; Through carrying independent call agreement (BICC; Bearer Independent Call Control protocol) solves the problem that calling control and carrying control separate; Call control signalling can be carried on diverse network, is that direct application towards telephone service proposes, and can the good transparency be provided for the business of in NGN, implementing in the available circuit switched telephone network.
Therefore in existing GSM network system, the BSC side need be accomplished G.711 the conversion of the compressed encoding (like the HR/FR/EFR coding) of wireless side voice to non-compressed encoding; The MGW of core-network side need accomplish the conversion that G.711 non-compressed encoding arrives the AMR compressed encoding, and, in the MGW both sides; Also need carry out the conversion (MGW one side is that TDM carries, and opposite side is that IP carries) of bearing mode, in order to realize above-mentioned conversion; Usually (TC TranScodec), inserts TC at MGW to insert TRAU or code pattern converter at the BSC of GSM network system; Carry out the corresponding conversion of speech coding and bearing mode; So just reduce voice quality, and wasted the TC resource of a large amount of costlinesses, caused equipment cost high.Simultaneously, because the A interface adopts G.711 coding, the calling of every road need take the bandwidth of 64K, causes the waste of BSC to the long-distance transfer resource of MGW.
In order to save BSC to the TDM transfer resource between the MGW; Improving one's methods of proposing at present be, the TRAU of BSC side is transferred to the MGW side, places with MGW; As shown in Figure 2; Fig. 2 is improved calling and called one side GSM schematic network structure, between BSC and TRAU, adopts Ater Interface, utilizes the mode transferring voice and the data of trau frame.Between TRAU and MGW, keep original interface and bearing mode, because call out on every road of Ater Interface, only take the 16K bandwidth, can 4 tunnel callings be multiplexed in the time slot of a TDM, thereby can save long-distance transfer resource valuable between BSC and the MGW.
Though above-mentioned improving one's methods solved the long-distance transmission resource waste problem between BSC and the MGW; But need on TRAU and MGW, all insert the conversion that TC carries out speech coding form and bearing mode, same exist since repeatedly the voice quality that causes of code conversion descend and the waste of TC resource.
Summary of the invention
In view of this, the main purpose of the embodiment of the invention is to provide a kind of method that realizes gsm wireless net and core net interface IPization, improves voice quality.
Another purpose of the embodiment of the invention is to provide a kind of system that realizes gsm wireless net and core net interface IPization, improves voice quality.
For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that
A kind of method that realizes gsm wireless net and core net interface IPization, this method may further comprise the steps:
A. moving exchanging center MSC server receiving mobile MS sends carries the call request message of self supporting the sign indicating number type, and said MSC server is set up a sign indicating number type precedence table according to said call request message, sends to the media gateway MGW wireless side and adds end points message;
B. said MSC server receives that said MGW wireless side returns comprises the IP address that MGW is call distribution and the response message of port numbers; Send assignment message to BSC; Said assignment message carries IP address and port numbers and the said server sign indicating number type precedence table that said MGW is call distribution; Said BSC receives said assignment message, and corresponding IP carrying is established and carries out yard type and consult;
Wherein, further comprise after the step B: said BSC revises the sign indicating number type,
When definite code pattern converter TC is arranged on the BSC side, said BSC makes amendment to the sign indicating number type of choosing, and reports said MSC server, initiates a sign indicating number type by said MSC server and consults again; Or TC is arranged on the MGW side, when said BSC modification or switching sign indicating number type; Initiate the request of change sign indicating number type, said MSC server with the sign indicating number type of MGW corresponding endpoint revise finish after, send the answer code type information of changing to said BSC; Said BSC receives change sign indicating number type information, revises the sign indicating number type.
A kind of system that realizes gsm wireless net and core net interface IPization comprises BSC, MSC server and MGW, and said MSC server is further used for realization and said BSC and MGW interface IPization, wherein,
Said MSC server; Be used for signaling control, receive and carry the call request message that MS self supports the sign indicating number type, set up sign indicating number type precedence table; Send interpolation end points message to the MGW wireless side; The IP address that comprising of receiving that said MGW wireless side returns, MGW was call distribution and the response message of port numbers send assignment message to said BSC, and wherein said assignment message carries the IP address and port numbers and said yard type precedence table that said MGW is call distribution;
Said MGW receives the said interpolation end points message that said MSC server sends, and returns to said MSC server to comprise the IP address that said MGW is call distribution and the response message of port numbers;
Said BSC to the said call request message of said MSC server transparent transmission, receives the said assignment message that said MSC server sends, and according to the assignment message that receives, sets up with corresponding IP carrying of said MGW and sign indicating number type and consults;
Wherein, when code pattern converter TC is arranged on the BSC side, said BSC makes amendment to the sign indicating number type of choosing, and reports said MSC server, initiates a sign indicating number type by said MSC server and consults again; Or TC is arranged on the MGW side, when said BSC modification or switching sign indicating number type; Initiate the request of change sign indicating number type, said MSC server with the sign indicating number type of MGW corresponding endpoint revise finish after, send the answer code type information of changing to said BSC; Said BSC receives change sign indicating number type information, revises the sign indicating number type.
Visible by technique scheme; The realization gsm wireless net of the embodiment of the invention and core net interface IPization method and system; Adopt IP to carry through A interface between BSC and MGW, directly transmit HR/FR/EFR compressed voice coding, can effectively reduce the waste of TC resource at the A interface; Realize the full approach encode/decode-free device operation (TrFO, Transcoder-Free Operation) or the halfway footpath TrFO of speech channel between the calling and called side BSC.Further pass through, and/or Abis interface adopts IP to carry, and directly transmits HR/FR/EFR compressed voice coding, reduces the waste of TC resource the TrFO in realization full approach of network or halfway footpath at Ater Interface.Simultaneously, the waste of less long-distance transfer resource effectively.
Description of drawings
Fig. 1 is existing GSM network architecture sketch map.
Fig. 2 is improved calling and called one side GSM schematic network structure.
Fig. 3 is the system configuration sketch map of embodiment of the invention gsm wireless net and core net interface IPization.
Fig. 4 is a system configuration sketch map of realizing A interface IPization between gsm wireless net and core net in the embodiment of the invention one.
Fig. 5 is the protocol stack layers aggregated(particle) structure sketch map of embodiment of the invention system shown in Figure 4 A interface signaling face and loading end.
Fig. 6 is a system configuration sketch map of realizing A interface IPization between gsm wireless net and core net in the embodiment of the invention two.
Fig. 7 is a system configuration sketch map of realizing Ater Interface IPization between gsm wireless net and core net in the embodiment of the invention three.
Fig. 8 is a system configuration sketch map of realizing IPization between gsm wireless net and core net in the embodiment of the invention four.
Fig. 9 is a system configuration sketch map of realizing IPization between gsm wireless net and core net in the embodiment of the invention five.
Figure 10 is arranged on the signaling process schematic flow sheet of BSC side for embodiment of the invention TC.
Figure 11 is arranged on the signaling process schematic flow sheet of MGW side for embodiment of the invention TC.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is done further explain.
The embodiment of the invention is directly transmitted the isobaric abbreviated expression sound coding of HR/FR/EFR of wireless side through realizing the A interface IPization between BSC and the MGW, can effectively reduce the waste of TC resource, realizes the TrFO in full approach of speech channel or halfway footpath.
In order to realize above-mentioned thought, the present invention proposes a kind of system that realizes gsm wireless net and core net interface IPization.Gsm wireless net and core net interface IPization comprise that setting up IP carries and realize the negotiation of sign indicating number type: the problem that the voice quality that the coding TC that media business adopts IP transmission, signaling to adopt IP transmission, solution simultaneously to introduce thus brings descends.Fig. 3 is the system configuration sketch map of embodiment of the invention gsm wireless net and core net interface IPization.Referring to Fig. 3, this system comprises: MS, BTS, BSC, MSC server and MGW.
Wherein, MS is used for carrying the call request message of self supporting the sign indicating number type to the BSC transmission, and the calling that reception MSC server returns is just in processing messages;
BTS is used for calling that call request message that transparent transmission MS sends and MSC server send just in processing messages;
BSC is used for setting up IP with MGW and carries and realize a yard type conversion, the call request message that reception MS sends, and to MSC server transparent transmission, the calling that receives the transmission of MSC server is transmitted just in processing messages; Receive the assignment message that the MSC server sends,, obtain MGW wireless side IP address and port numbers, be this call distribution its own IP address and port numbers, set up IP and carry if confirm that BSC and MGW interface are the A interface;
If confirm that BSC and MGW interface are Ater Interface, utilize the in-band signalling mode (in-band signalling between BSC and the MGW can be set up in advance) of loading end, consult to set up Ater Interface passage between BSC and MGW through the TRAU signaling, set up IP and carry; Or, Ater Interface between BSC and MGW is modeled as the A interface, BSC receives assignment message, obtains MGW wireless side IP address and port numbers, is the IP address and the port numbers of this call distribution self Ater Interface side, sets up IP and carries;
Receive the assignment message that the MSC server sends, according to sign indicating number type precedence table information or self strategy, the access code type, and the sign indicating number type that BSC chooses is fed back to the MSC server through the assignment response message; If the sign indicating number type of choosing is consistent with yard sign indicating number type that type precedence table medium priority is the highest, realized this section TrFO, accomplish the transparent transmission of Media Stream; Otherwise, receive MSC server modifications sign indicating number type message, the sign indicating number type conversion between the sign indicating number type that completion BSC chooses and the sign indicating number type of MSC server requirement.
The MSC server adopts the carrying of 3GPP R4 to control separate mode, is used for the processing signaling control section; Transmit IP through expansion BSSAP signaling and carry relevant information such as IP address and port numbers; Receive the call request message that MS sends, extract sign indicating number type wherein, get common factor with the sign indicating number type of self supporting; Set up sign indicating number type precedence table, send to MS and call out just in processing messages; Send interpolation end points message to the MGW wireless side, receive the response message that MGW returns; Carry yard message of type precedence table information to other MSC servers transmissions or reception, accomplish the sign indicating number type and consult a realization TrFO; Send assignment message to BSC, receive the assignment response message that comprises the access code type that BSC sends, send to MGW; If accomplish sign indicating number type translation function, can issue a modification sign indicating number type message to BSC or MGW in case of necessity at BSC.
MGW; Be used for setting up IP and carry and realize the conversion of sign indicating number type with BSC; Receive the interpolation end points message that the MSC server sends, the response message of IP address that is included as call distribution and port numbers is sent to the MSC server, receive a carrying and a change sign indicating number type message that the MSC server sends; Obtaining BSC is the IP address and the port numbers of call distribution, sets up IP and carries; And revise the sign indicating number type of corresponding endpoint according to message indication.
In the system shown in Figure 3, MGW can be same MGW, also can not be same MGW; When MGW is not same MGW, between the BSC of opposite side and the MGW A interface set up IP carry is connected and system shown in Figure 3 similar, repeat no more at this.
And the MSC server can be same MSC server, also can not be same MSC server; When the MSC server is not same MSC server; Adopt Nc interface between MSC server and the MSC server; Adopt Nb interface between MGW and the MGW; Send initialization (IAM) information by Calling Side MSC server to callee side MSC server, callee side MSC server returns the IP bearer related information, the IP carrying between the Nb interface side of setting up Calling Side MGW and the Nb interface side of callee side MGW; Specifically can be with reference to BICC and IP Bearer Control Protocol (IPBCP, IP Bearer Control Protocol).Set up IP between calling and called both sides MGW wireless side and BSC and carry and is connected, carry and is connected similarly, carry out the foundation that yard type consults realization TrFO and the foundation of IP carrying with setting up a caller or a called side MGW wireless side and IP between BSC.Different is that both sides all are that IP carries, and the TrFO that carry out full speech channel approach consults.And only a side is that IP carries, and can only set up the TrFO in the halfway footpath of speech channel.
Among Fig. 3, the assignment response message should comprise: the sign indicating number type that BSC chooses, BSC are information such as the IP address, port numbers of call distribution.
Based on system shown in Figure 3, lift seven embodiment below, in realizing the process that GSM network interface IP carries, using embodiment of the present invention to be elaborated.In the system configuration sketch map of seven embodiment of the present invention, dotted line is depicted as signaling information, and solid line is depicted as beared information.
Embodiment one:
Fig. 4 is a system configuration sketch map of realizing A interface IPization between gsm wireless net and core net in the embodiment of the invention one.The BTS that present embodiment comprises with Calling Side, BSC, MSC server and MGW are example, and TC is arranged on the BSC side when the conversion of sign indicating number type, and the A interface realizes that the IP carrying describes.Realize IPization for callee side A interface, similar with Calling Side, repeat no more at this.Referring to Fig. 4, wherein, the interface between BTS and the BSC is an Abis interface, and the interface between BSC and the MGW is the A interface, and the interface of MGW and MSC server is a Mc interface.
The A interface control plane adopts the signaling transmission (Sigtran of standard code; Signal Transport) agreement is carried, in the present embodiment, for the function that realizes that A interface IP carries; The management function that needs expansion A interface control plane speech IP mode bearing resource; And the necessary BSSAP information of expansion, for example, the BSSAP message after expansion has the ability of IP bearer related informations such as transmission IP address and port numbers.
MS makes a call, and carries the sign indicating number type information of support, through the BTS transparent transmission; BSC receipt of call request message through the BSSAP signaling, sends to the MSC server; The MSC server obtains the sign indicating number type that caller is supported, gets common factor, generated code type precedence table with the sign indicating number type of self supporting; Send interpolation end points message through Mc interface to the MGW wireless side, MGW receives and adds end points message, is call distribution IP address and port numbers; Return the IP address that MGW is call distribution and the response message of port numbers through Mc interface to the MSC server; The MSC server receives the response message of MGW, and the MSC server sends to BSC through the BSSAP signaling and carries the MGW assignment message of IP address, port numbers and the MSC server sign indicating number type precedence table of call distribution for this reason, and BSC receives assignment message; IP address and port numbers for the call distribution we; And initiate IP and carry and set up, BSC carries out choosing of yard type according to sign indicating number type precedence table information or self strategy simultaneously, return to the MSC server comprise BSC access code type, BSC is the IP address of call distribution and the assignment response message of port numbers.The MSC server receives the assignment response message; Therefrom obtaining BSC is the IP address and the port numbers of call distribution; Send to MGW wireless side end points, MGW wireless side end points obtains IP address and the port numbers that BSC is call distribution, just can set up and BSC between the IP carrying; The MSC server receives the assignment response message simultaneously; Therefrom obtain BSC access code type; The access code type of Calling Side BSC is put into a yard type precedence table primary importance back kick passs callee side MSC server, in transmittance process backward, the sign indicating number type of MGW associated end points is the optimum code type in indication or the modification approach; The sign indicating number type precedence table that callee side MSC server will obtain is handed down to callee side BSC; If callee side BSC supports the access code type of Calling Side BSC, and has chosen the optimum code type, then realize the TrFO of the full approach of speech channel; Otherwise; The sign indicating number type that callee side BSC will choose through the assignment response message feeds back to callee side MSC server; Callee side MSC server issues the sign indicating number type of revising to callee side BSC or callee side MGW wireless side end points again; Or through of the Nb side point down signaling type change order of Calling Side MSC server to Calling Side BSC or Calling Side MGW; After the Nb side point receiving code type change order of said callee side BSC or callee side MGW wireless side end points or Calling Side BSC or Calling Side MGW, accomplish the conversion between caller access code type and the called access code type.
If between callee side MGW and callee side BSC, carry for TDM; If callee side BSC supports the access code type of Calling Side BSC; And chosen the optimum code type; Then callee side MSC server issues to callee side MGW and revises sign indicating number type message, on callee side MGW, accomplishes the bear format conversion of IP to TDM, can realize TrFO at callee side; Otherwise if callee side BSC does not support the sign indicating number type that Calling Side BSC chooses, callee side MSC server issues to callee side MGW and revises sign indicating number type message, on callee side MGW, accomplishes conversion of sign indicating number type and the IP bear format conversion to TDM simultaneously.If be carried as TDM between Calling Side MGW and the Calling Side BSC; Similarly; On Calling Side MGW, accomplish conversion of sign indicating number type and IP bear format conversion simultaneously to TDM; But the sign indicating number type negotiations process between the MSC server is different; Calling Side MSC server indicates in giving the message of callee side MSC server need return the sign indicating number type that callee side BSC chooses; Therefore callee side MSC server sign indicating number type that callee side BSC is chosen passes to Calling Side MSC server, and the sign indicating number type of MGW associated end points is the sign indicating number type that called BSC chooses in the modification approach simultaneously, and the sign indicating number type of by Calling Side MSC server callee side BSC being chosen again is handed down on the Nb interface end points of Calling Side MGW.So just guaranteed that all IP supporting part demal types are consistent, had only TDM to insert TC to the IP transfer point.
Fig. 5 is the protocol stack layers aggregated(particle) structure sketch map of embodiment of the invention system shown in Figure 4 A interface signaling face and loading end, and referring to Fig. 5, the A interface signaling face protocol stack bottom is medium access control (MAC; Media Access Control) layer, if physical layer is not 100,000,000 or gigabit Ethernet, but POS (Packet Over SONET/SDH/GE; Gigabit Ethernet) or IP OVER E1, then the bottom is peer-peer protocol (PPP, a Point-to-Point Protocol) layer; Make progress second layer IP layer, the 3rd laminar flow control transmission agreement (SCTP successively; Stream Control Transmission Protocol) layer, the 4th layer of M3 user adaptive (M3UA, M3User application) layer; Layer 5 client control protocol (SCCP, Skinny Client Control Protocol) layer, the superiors are BSSAP layers; Signaling is transmission successively between each layer, in the present embodiment, need expand accordingly the management function of BSSAP layer Base Station Subsystem Application Part and speech IP mode bearing resource.
If the IP interface is 100,000,000 or gigabit Ethernet, the A interface bearing face protocol stack bottom is the MAC layer, if pos interface or IP OVER E1 interface; Then lowermost layer is the PPP layer, makes progress second layer IP layer successively; The 3rd layer of UDP (UDP, User Data Protocol) layer, the 4th layer of RTP (RTP; Real-time Transmission Protocol) layer, beared information be transmission successively between each layer.
In the practical application, can also adopt IP to carry, can further reduce network carrying mode and change the time delay that is caused and improve utilization ratio of transmission resources through the former TDM of the Abis interface between BTS and the BSC is carried.
And; The MSC server can be same MSC server among the embodiment, also can be different MSC servers, when the MSC server is not same MSC server; After a side MSC server obtains the sign indicating number type that corresponding BSC chooses; Carry out coding negotiation with opposite side MSC server, if the sign indicating number type that can't agree in both sides only inserts TC and carries out code conversion on the BSC of a side.
Visible by the foregoing description, the present invention sets up IP through the A interface of MSC server between BSC and MGW carries, and has reduced the conversion of speech coding form effectively; Even need not carry out the conversion of speech coding form, reduce the voice transfer time delay, improve the quality of voice transfer; Save the TC resource; Simultaneously, owing to adopted the IP bearing mode, saved long-distance transfer resource valuable between BSC and the MGW.For example; In original GSM network system; Need between the calling and called side BSC nearly that 4 TC carries out the conversion of different sign indicating number types and the conversion of bearing mode, after the A interface is set up IP and carried, need not between the calling and called side BSC or only need 1 TC to carry out the conversion of yard type and need not the conversion of bearing mode; If further Abis interface is also adopted the IP bearing mode, then the whole calling approach between the calling and called MS need not carry out the conversion of bearing mode.
In the foregoing description one, TC is arranged on the BSC side, and in practical application, TC also can be arranged on the MGW side, and the A interface realizes that IP carries.Be arranged on the MGW side for TC, trau frame can terminate in the BSC side, also can terminate in the MGW side, through embodiment two and embodiment three its embodiment is described respectively below.
Embodiment two:
Fig. 6 is a system configuration sketch map of realizing A interface IPization between gsm wireless net and core net in the embodiment of the invention two.The BTS that present embodiment comprises with Calling Side, BSC, MSC server and MGW are example; And calling and called side MSC server and MGW can be same MSC server and MGW, and TC is arranged on the MGW side, and trau frame terminates in the BSC side; Be to be the A interface between BSC and MGW, A interface realization IP carries.
The A interface control plane adopts the Sigtran agreement of standard code to carry; The resource management function that needs expansion ip voice bearing mode; BSSAP information is expanded, made the BSSAP information after the expansion have the ability of IP bearer related informations such as transmission IP address and port numbers; A interface business face adopts IP to carry.
It is similar with Fig. 4 that system shown in Figure 6 A interface is set up IP carrying connection, and different is to need the sign indicating number type to change all on MGW, to accomplish, and on BSC, does not carry out; Behind the sign indicating number type that BSC chooses, BSC carries the sign indicating number type information that BSC chooses through the BSSAP signaling in the assignment response message of MSC server, and the MSC server is responsible for carrying out yard type and is consulted; If callee side BSC supports the access code type of Calling Side BSC, and has chosen the optimum code type, then realize the TrFO of speech channel; Otherwise callee side MSC server is received the assignment response message of callee side BSC, and callee side MSC server is handed down to callee side MGW wireless side end points through the sign indicating number type that callee side BSC is chosen in the sign indicating number type change order of Mc interface again; Perhaps callee side MSC server sign indicating number type that callee side BSC is chosen; Be delivered to Calling Side MSC server forward; Through sign indicating number type change order the access code type of callee side BSC is handed down to the Nb side point of Calling Side MGW through Calling Side MSC server; Relatively whether the sign indicating number type of this calling both sides end points was consistent after MGW received and orders, if inconsistent, inserted TC.The protocol stack layers aggregated(particle) structure of A/Ater interface signaling face and loading end is also identical with Fig. 5.
If it is IP that the A interface of calling and called has only a side, and opposite side is when being TDM, and the conversion of sign indicating number type is on the MGW of TDM at the A interface all the time.Concrete realization is similar with embodiment one.
Likewise, also can adopt IP to carry, further reduce network carrying mode and change the time delay that is caused and improve utilization ratio of transmission resources through the former TDM of the Abis interface between BTS and the BSC is carried.
Embodiment three:
Fig. 7 is a system configuration sketch map of realizing Ater Interface IPization between gsm wireless net and core net in the embodiment of the invention three.Different with Fig. 6 is, the trau frame of system shown in Figure 7 transmission terminates in the MGW side, and promptly BSC and MGW interface are equivalent to the Ater Interface in original gsm system.
Because trau frame terminates in the MGW side, the interface between BSC and the MGW is an Ater Interface.And the A interface in original gsm system has been retracted to MGW inside, adopts Sigtran to carry to the A interface signaling, and the Ater Interface signaling adopts the IP bearing mode.Signaling between BSC and the MSC server can be passed through the direct intercommunication of IP, also can carry out IP through MGW and transmit; The circuit of MSC server controls Ater Interface IP loading end is set up, and two kinds of methods are arranged:
1) the .MSC server is not controlled the circuit foundation of Ater Interface IP loading end: adopt the in-band signalling mode of loading end, consult to set up the Ater Interface passage by MGW and BSC through the TRAU signaling.MGW obtains the phonetic code type of BSC and judges whether the sign indicating number type of both sides is consistent through resolving the trau frame of Ater Interface, if inconsistent, insert TC and carries out the conversion of speech coding.
2) circuit of .MSC server controls Ater Interface IP loading end is set up: the resource management function and the Base Station Subsystem Application Part IP bearer related information of expansion ip voice bearing mode are modeled to the A interface in the original system with Ater Interface.The circuit of Ater Interface IP loading end is set up with Fig. 4 similar; Different is, after MGW and BSC set up IP and carry, after the MSC server obtains the access code type of BSC; Be handed down to the end points of the corresponding BSC side of MGW, so just guaranteed that the sign indicating number type of the corresponding BSC side point with MGW of sign indicating number type of BSC side is consistent.Relatively whether the sign indicating number type of both sides is consistent again for MGW, if consistent, the TrFO of realization speech channel, otherwise, insert TC and carry out code conversion.
With respect to Fig. 5, the A/Ater interface bearing face protocol stack of system shown in Figure 7 has increased layer 5 TRAU layer.
Visible by the foregoing description, do not handle owing to need not carry out trau frame on the BSC, need not carry out the conversion of speech coding yet, just carry out the transparent transmission of trau frame.
In the foregoing description one, two, three, the trau frame of transmission is terminated by BSC or MGW, further, also can cancel trau frame at the whole network, promptly directly directly exports the speech frame that carries based on IP at BTS.
Through embodiment four and embodiment five its embodiment is described respectively below.
Embodiment four:
Fig. 8 is a system configuration sketch map of realizing IPization between gsm wireless net and core net in the embodiment of the invention four.As shown in Figure 8, IP carries that to be connected mode and Fig. 4 of setting up similar between BSC and the MGW, need carry out the expansion of necessity to Base Station Subsystem Application Part; Be used to transmit IP address and port numbers etc. and carry relevant information,, carry out code conversion at MGW side insertion TC if Calling Side BSC leans on MGW one side and callee side BSC inconsistent by the sign indicating number type of a called side with IP; After IP carried and connects foundation, BTS exported IP-based speech frame, for example; The IP/UDP/RTP/VOICE message, BSC receives speech frame, transmits to MGW.
In the foregoing description,, reduced the time delay of transmission, improved the quality of voice transfer owing to need not carry out the conversion of bearing mode.
And the BSC of the foregoing description also can not participate in the forwarding of speech frame after IP carries connection foundation, directly carries out the mutual of speech frame between BTS and the MGW, further reduces speech frame and on BSC, transmits the time delay that causes, and practices thrift the disposal ability of BSC.
Embodiment five:
Fig. 9 is a system configuration sketch map of realizing IPization between gsm wireless net and core net in the embodiment of the invention five.BSC carries out signaling transmission control (LAPD through common signal channel D; Link Access Procedure on the D channel) and BSSAP carry out the mutual of signaling with BTS and MSC server respectively; Do not participate in the forwarding of loading end speech frame; In the present embodiment, be connected with the carrying of MGW, need carry out the expansion of IP bearer related information Base Station Subsystem Application Part and LAPD agreement in order to set up BTS.It is similar to carry establishment of connection and Fig. 4; Different is; BSC receives and sends to BTS through the LAPD signaling after assignment message obtains the IP beared information; BTS obtains IP address and the port numbers that the MGW wireless side is call distribution, is IP address and the port numbers of call distribution we BTS, and BTS is that the IP beared information (IP address and port numbers) of call distribution reports BSC; BSC carries the BTS IP address allocated through the assignment response message again and port numbers sends to the MSC server, and the MSC server is indicated to MGW again.BTS and MGW both sides know the IP address and the port numbers of opposite end, just can carry foundation.The sign indicating number type that BTS adopts receives the control of BSC, i.e. the access code type that carry of BSC in the assignment response message fully.The BTS sign indicating number type that the MSC server is chosen wireless side is handed down to MGW, guarantees that MGW remains consistent with BTS employing sign indicating number type near the end points sign indicating number type of wireless side.The MSC server carries out the sign indicating number type of the full approach of speech channel to be consulted, if consensus, has just realized TrFO.If inconsistent Calling Side MGW or the callee side MGW of choosing inserts TC and carries out a yard type conversion.
In the practical application; MS also may switch between different B TS, and BSC sends notice to the MSC server, with IP address and the port number information notice MSC server of new BTS; MSC server reception notification information issues the notice that the carrying of MGW is made amendment and accomplishes the switching of carrying.
Lift embodiment six and embodiment seven below again, signaling control flow process of the present invention is described.
Embodiment six:
Figure 10 is arranged on the signaling process schematic flow sheet of BSC side for embodiment of the invention TC.In the present embodiment, TC is arranged on the BSC place, accomplishes the speech coding conversion by BSC, sets up IP the calling party and carries connection, and referring to Figure 10, this flow process comprises:
Step 103, MSC server are sent to MGW and are added end points message;
In step 101～103, carry the sign indicating number type that MS self supports in the call request message that the MSC server receives, get common factor with the sign indicating number type of MSC server support, generated code type precedence table adds end points through Mc interface on the MGW wireless side;
Step 104, MGW wireless side receive adds end points message, returns response message;
In this step, the MGW wireless side receives adds end points message, is this call distribution IP address and port numbers, and response message comprises MGW the IP address and the port numbers of call distribution for this reason;
In this step; BSC receives response message; Therefrom obtaining MGW is the IP address and the port numbers of call distribution, and is call distribution our IP address and port numbers, initiates IP simultaneously and carries foundation; BSC chooses the sign indicating number type that self uses; Can be priority access code type in the sign indicating number type precedence table that provides according to the MSC server, also can be according to self tactful access code type, BSC returns the IP address that the access code type that comprises BSC and BSC be call distribution and the assignment response message of port numbers to the MSC server.Initiate the sign indicating number type negotiation that full speech channel is called out by the MSC server, its step:
BSC access code type sends sign indicating number type information to the MSC server, the MSC server with the access code type of BSC after to transmission, the access code type of Calling Side BSC is put into a yard type precedence table primary importance is handed down to callee side BSC; If callee side BSC supports and has chosen the access code type of Calling Side BSC; Then realize the TrFO of full speech channel approach; Otherwise priority is inconsistent in the access code type of callee side BSC and the MSC server sign indicating number type precedence table, then need on callee side BSC, accomplish the conversion of sign indicating number type.For example, caller assignment FR/EFR, Calling Side BSC selects FR; Calling Side MSC server with FR after to transmission, called MS is supported HR/FR/EFR, callee side MSC server issues FR/HR/EFR to callee side BSC; If callee side BSC selects FR; Then to recommend preferred sign indicating number type consistent for the access code type of Calling Side BSC and Calling Side MSC server push, need not insert TC and carry out yard type and change, and can realize full speech channel approach TrFO; If callee side BSC has selected HR; Feed back to callee side MSC server through the assignment response message; Callee side MSC server is found can't realize TrFO in this section through analysis and judgement, then issues to callee side BSC and revises sign indicating number type message, lets callee side BSC accomplish the sign indicating number type conversion between FR and the HR.
In the practical application, after IP carried connection foundation, if from reasons such as wireless network capacitances, BSC need make amendment to the sign indicating number type of choosing, and then BSC revises the sign indicating number type of choosing voluntarily, and reports the MSC server, is consulted again by MSC discovering server sign indicating number type.The sign indicating number type of process and call setup is consulted similar, is not both the situation of callee side MSC server to the preferred sign indicating number of Calling Side MSC server transmission type to occur.The BSC sign indicating number type of one side possibly cause the TrFO of full speech channel to be broken after changing; But, consult to call out into TrFO through consulting also might make the calling of former non-TrFO again.
Embodiment seven:
Figure 11 is arranged on the signaling process schematic flow sheet of MGW side for embodiment of the invention TC, and referring to Figure 11, this flow process comprises:
Step 113, MSC server are sent to the MGW wireless side and are added end points message;
In step 111～113, carry the sign indicating number type that MS self supports in the call request message that the MSC server receives, get common factor with the sign indicating number type of MSC server support, generated code type precedence table adds end points through Mc interface on the MGW wireless side
Step 114, MGW wireless side receive adds end points message, returns response message;
In this step, in this step, the MGW wireless side receives adds end points message, is this call distribution IP address and port numbers, and response message comprises MGW the IP address and the port numbers of call distribution for this reason.
Step 116, BSC receives assignment message, returns the assignment response message;
In this step, BSC receives assignment message, and therefrom obtaining MGW is the IP address and the port numbers of call distribution; IP address and port numbers for the call distribution we; Set up IP and carry, BSC chooses the sign indicating number type that self uses, and can be priority access code type in the sign indicating number type precedence table that provides according to the MSC server; Also can be according to self tactful access code type, send the access code type that comprises BSC and BSC the IP address, the assignment response message of port numbers of call distribution for this reason to the MSC server.
Step 117, the MSC server receives the assignment response message, and its IP beared information that comprises and change sign indicating number type message are sent to the MGW wireless side;
In this step, MGW obtains the IP beared information of the wireless side of BSC appointment, and MGW just can initiate to the BSC/BTS of wireless side to carry and set up.MGW wireless side end points receives change sign indicating number type message, and the sign indicating number type according to this end points of sign indicating number type modification of wherein indicating returns response message to the MSC server.
Called signaling process flow process and caller are similar; Guaranteed that through sign indicating number type change message it is consistent that BSC leans on the sign indicating number type of wireless network 1 side point to lean on the sign indicating number type of BSC 1 side point with MGW; Whether the sign indicating number type that MGW only need compare Nb interface and A/Ater interface is consistent; If the sign indicating number type is inconsistent, insert sign indicating number type conversion TC; Otherwise do not insert a yard type conversion TC, realized the full approach of speech channel or the TrFO in halfway footpath.
After IP carry to connect set up, BSC revised or when switching the sign indicating number type as required; Initiate the request of change sign indicating number type, the MSC server sends change answer code type information to BSC after the whole modifications of the sign indicating number type of the corresponding end points of all MGW are finished; BSC receives change sign indicating number type message, revises the sign indicating number type.
The present invention is through adopting the IP transmission between BSS and MSS; Utilize the Packet Multiplexing characteristic of IP can arrive the purpose of saving transmission; In the practical application; Also can adopt correlation techniques such as Real Time Compression agreement (CRTP, Compressed Real-Time Protocol), real-time protocol (RTP) multiplexing (RTP Multiplex), point-to-point protocol multiplexing (PPPMUX, Point to Point Protocol Multiplex), IP be multiplexing further to improve efficiency of transmission.More than lift preferred embodiment; The object of the invention, technical scheme and advantage have been carried out further explain, and institute it should be understood that the above is merely preferred embodiment of the present invention; Not in order to restriction the present invention; 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 (16)
1. method that realizes gsm wireless net and core net interface IPization is characterized in that this method comprises:
A. moving exchanging center MSC server receiving mobile MS sends carries the call request message of self supporting the sign indicating number type, and said MSC server is set up a sign indicating number type precedence table according to said call request message, sends to the media gateway MGW wireless side and adds end points message;
B. said MSC server receives that said MGW wireless side returns comprises the IP address that MGW is call distribution and the response message of port numbers; Send assignment message to BSC; Said assignment message carries IP address and port numbers and the said server sign indicating number type precedence table that said MGW is call distribution; Said BSC receives said assignment message, and corresponding IP carrying is established and carries out yard type and consult;
Wherein, further comprise after the step B: said BSC revises the sign indicating number type,
When definite code pattern converter TC is arranged on the BSC side, said BSC makes amendment to the sign indicating number type of choosing, and reports said MSC server, initiates a sign indicating number type by said MSC server and consults again; Or TC is arranged on the MGW side, when said BSC modification or switching sign indicating number type; Initiate the request of change sign indicating number type, said MSC server with the sign indicating number type of MGW corresponding endpoint revise finish after, send the answer code type information of changing to said BSC; Said BSC receives change sign indicating number type information, revises the sign indicating number type.
2. method according to claim 1; It is characterized in that; Carrying that the said moving exchanging center MSC server of steps A receiving mobile MS sends self supports the call request message of sign indicating number type to comprise: said MS initiates to carry the call request message of self supporting the sign indicating number type; Through base station transceiver BTS and said BSC transparent transmission, send to said MSC server.
3. method according to claim 1; It is characterized in that; The said MSC server of steps A is set up sign indicating number type precedence table according to call request message and comprised: said MSC server receives said call request message; Sign indicating number type of self supporting and the sign indicating number type that the said MS that receives supports are got common factor, set up said sign indicating number type precedence table.
4. method according to claim 1; It is characterized in that; The said MSC server of step B receives that MGW returns, and to comprise the MGW wireless side be that the response message of call distribution IP address and port numbers comprises: said MGW wireless side receives said interpolation end points message; Be call distribution IP address and port numbers, return to said MSC server and carry the response message that the MGW wireless side is call distribution IP address and port numbers; IP address that it is call distribution that the said assignment message that sends to BSC comprises said MGW wireless side and port numbers and said sign indicating number type precedence table information.
5. method according to claim 1 is characterized in that, the said BSC of step B receives assignment message, and corresponding IP carries to be established and comprises:
Said BSC receives said assignment message; If confirm that said BSC and said MGW interface are the A interface; Obtaining said MGW is the IP address and the port numbers of call distribution, is this call distribution IP address and port numbers, initiates IP and carries foundation; Comprise this BSC to said MSC server transmission and be the IP address of this call distribution and the assignment response message of port numbers; The said assignment response message that said MSC server will receive is sent to said MGW wireless side end points, and said MGW wireless side end points obtains IP address and the port numbers of said BSC for this call distribution, and the said IP between foundation and the said BSC carries; Perhaps
Said BSC receives said assignment message, comprises Ater Interface if confirm said BSC and said MGW interface, utilizes the in-band signalling mode of loading end, consults to set up Ater Interface passage between said BSC and said MGW through the TRAU signaling, sets up said IP and carries; Or; Ater Interface between said BSC and said MGW is modeled as the A interface, and said BSC receives said assignment message, and obtaining said MGW is the IP address and the port numbers of call distribution; IP address and port numbers for this call distribution self Ater Interface side; Initiate IP and carry and set up, will comprise this BSC and send to said MSC server for the IP address of this call distribution and the assignment response message of port numbers, said MSC server is sent to said MGW wireless side with said assignment response message; Said MGW wireless side is obtained IP address and the port numbers of said BSC for this call distribution, sets up said IP and carries.
6. method according to claim 1 is characterized in that, when the interface between MGW and the BSC does not comprise Ater Interface; The said BSC of step B receives assignment message, carries out yard type and consults to comprise: after BSC receives said assignment message, according to priority sign indicating number type access code type in the sign indicating number type precedence table; Or, the sign indicating number type that BSC chooses being returned to the MSC server through the assignment response message according to the tactful access code type of BSC self, the MSC server receives the assignment response message; Carry out yard type and consult, if consensus, the sign indicating number type is consulted successfully; Otherwise, according to the corresponding sign indicating number of sign indicating number type negotiation result conversion type.
7. method according to claim 1 is characterized in that, when the interface between MGW and the BSC comprised Ater Interface, the said BSC of step B received assignment message, carries out yard type and consults to comprise:
BSC receives assignment message, the access code type, and the in-band signalling mode of employing loading end, MGW obtains the phonetic code type of BSC and judges whether the sign indicating number type of both sides is consistent through resolving the trau frame of Ater Interface, if inconsistent, insert TC and carries out the conversion of speech coding; Or,
Ater Interface between BSC and MGW is modeled as the A interface, and BSC receives assignment message, access code type; Return the assignment response message of the access code type that comprises BSC to the MSC server, after the MSC server obtains the access code type of BSC, be handed down to the end points of the corresponding BSC side of MGW; Relatively whether the sign indicating number type of MGW both sides end points is consistent again for MGW, if consistent, the TrFO of realization speech channel; Otherwise, insert TC and carry out code conversion.
8. method according to claim 6; It is characterized in that when being the IP carrying between Calling Side MGW and the Calling Side BSC and between callee side MGW and the callee side BSC, the said yard type that carries out is consulted; If it is consensus; The sign indicating number type is consulted successfully, otherwise the step of changing corresponding sign indicating number type according to sign indicating number type negotiation result comprises:
If confirm that the interface between MGW and the BSC is the A interface; The MSC server receives the access code type that the assignment response message therefrom obtains BSC; And the access code type of Calling Side BSC is put into a yard type precedence table primary importance back kick passs callee side MSC server, the sign indicating number type precedence table that callee side MSC server will obtain is handed down to callee side BSC;
If callee side BSC supports the access code type of Calling Side BSC, and has chosen the optimum code type, the sign indicating number type is consulted successfully; Otherwise; The sign indicating number type that callee side BSC will choose through the assignment response message feeds back to callee side MSC server; Callee side MSC server issues the sign indicating number type of revising to callee side BSC or callee side MGW wireless side end points; Or through of the Nb side point down signaling type change order of Calling Side MSC server to Calling Side BSC or Calling Side MGW; After the Nb side point receiving code type change order of said callee side BSC or callee side MGW wireless side end points or Calling Side BSC or Calling Side MGW, the conversion between the access code type of completion Calling Side BSC and the access code type of callee side BSC.
9. method according to claim 6 is characterized in that, between callee side MGW and callee side BSC, carries for time division multiplexing tdm; The said yard type that carries out is consulted, if consensus, the sign indicating number type is consulted successfully; Otherwise, comprise according to the step of the corresponding sign indicating number of sign indicating number type negotiation result conversion type:
The MSC server receives the assignment response message; Therefrom obtain the access code type of BSC; The access code type of Calling Side BSC is put into a yard type precedence table primary importance back kick passs callee side MSC server, the sign indicating number type precedence table that callee side MSC server will obtain is handed down to callee side BSC;
If callee side BSC supports the access code type of Calling Side BSC; And chosen the optimum code type, and the sign indicating number type is consulted successfully, and callee side MSC server issues to callee side MGW and revises sign indicating number type message; On callee side MGW, accomplish the bear format conversion of IP, can realize TrFO at callee side to TDM; Otherwise callee side MSC server issues to callee side MGW and revises sign indicating number type message, on callee side MGW, accomplishes conversion of sign indicating number type and the IP bear format conversion to TDM simultaneously.
10. method according to claim 6 is characterized in that, between Calling Side MGW and Calling Side BSC, carries for time division multiplexing tdm; The said yard type that carries out is consulted, if consensus, the sign indicating number type is consulted successfully; Otherwise, comprise according to the step of the corresponding sign indicating number of sign indicating number type negotiation result conversion type:
The MSC server receives the assignment response message; Therefrom obtain the access code type of BSC; The access code type of Calling Side BSC is put into a yard type precedence table primary importance back kick passs callee side MSC server; Carry the access code type information of returning callee side BSC simultaneously, callee side MSC server passes to Calling Side MSC server with the access code type of callee side BSC, and Calling Side MSC server is handed down to the access code type of callee side BSC on the Nb interface end points of Calling Side MGW; Make IP supporting part demal type consistent, on Calling Side MGW, accomplish conversion of sign indicating number type and IP bear format conversion to TDM.
11. method according to claim 1 is characterized in that, further comprises after the step B: BSC revises the sign indicating number type;
When definite TC is arranged on the BSC side, BSC makes amendment to the sign indicating number type of choosing, and reports the MSC server, initiates a sign indicating number type by the MSC server and consults again;
Or TC is arranged on the MGW side, and BSC revises or when switching the sign indicating number type, initiates the request of change sign indicating number type, the MSC server with the sign indicating number type of MGW corresponding endpoint revise finish after, send change answer code type information to BSC, BSC receives a change sign indicating number type information, revises a yard type.
12. method according to claim 1 is characterized in that, when carrying for TDM between BSC and BTS, when setting up that IP carries between BSC and BTS, Abis interface is set to the IP interface between BSC and BTS, and transmission is based on the speech frame of IP agreement.
13. method according to claim 1 is characterized in that, said step B further comprises:
MGW receives and adds end points message, is call distribution IP address and port numbers, returns to the MSC server and carries the response message that MGW is call distribution IP address and port numbers; The MSC server receives response message; After BSC sends assignment message, obtains the IP beared information, send to BTS through the LAPD signaling, BTS obtains IP address and the port numbers of MGW wireless side for this call distribution; Be call distribution its own IP address and port numbers; BTS will report BSC for the IP beared information of call distribution, and BSC carries the BTS IP address allocated through the assignment response message again and port numbers sends to the MSC server, and the MSC server is indicated to MGW again.BTS and MGW obtain the IP address and the port numbers of opposite end, carry out IP and carry foundation;
BSC receives assignment message; The access code type sends the access code type through the LAPD signaling to BTS, returns the assignment response message that comprises BTS sign indicating number type to the MSC server; The MSC server is handed down to MGW with the BTS sign indicating number type that BSC chooses, and makes the end points sign indicating number type of MGW wireless side consistent with BTS sign indicating number type; Initiate the sign indicating number type again and consult,, realize TrFO if consensus; Otherwise, carry out a yard type conversion to Calling Side MGW or callee side MGW insertion TC.
14. method according to claim 1 is characterized in that, this method further comprises: MS switches between different B TS;
BSC obtains by IP address and the port numbers of switching side BTS, initiates notification event to the MSC server, will be by the IP address of switching side BTS and port number information notice MSC server, and the MSC server is made amendment to the carrying of MGW.
15. a system that realizes gsm wireless net and core net interface IPization comprises BSC, MSC server and MGW, it is characterized in that, said MSC server is further used for realization and said BSC and MGW interface IPization, wherein,
Said MSC server; Be used for signaling control, receive and carry the call request message that MS self supports the sign indicating number type, set up sign indicating number type precedence table; Send interpolation end points message to the MGW wireless side; The IP address that comprising of receiving that said MGW wireless side returns, MGW was call distribution and the response message of port numbers send assignment message to said BSC, and wherein said assignment message carries the IP address and port numbers and said yard type precedence table that said MGW is call distribution;
Said MGW receives the said interpolation end points message that said MSC server sends, and returns to said MSC server to comprise the IP address that said MGW is call distribution and the response message of port numbers;
Said BSC to the said call request message of said MSC server transparent transmission, receives the said assignment message that said MSC server sends, and according to the assignment message that receives, sets up with corresponding IP carrying of said MGW and sign indicating number type and consults;
Wherein, when code pattern converter TC is arranged on the BSC side, said BSC makes amendment to the sign indicating number type of choosing, and reports said MSC server, initiates a sign indicating number type by said MSC server and consults again; Or TC is arranged on the MGW side, when said BSC modification or switching sign indicating number type; Initiate the request of change sign indicating number type, said MSC server with the sign indicating number type of MGW corresponding endpoint revise finish after, send the answer code type information of changing to said BSC; Said BSC receives change sign indicating number type information, revises the sign indicating number type.
16. system according to claim 15 is characterized in that, is provided with that Abis interface is the IP interface between BSC and BTS, is used to transmit the speech frame based on the IP agreement.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100068856A CN101237603B (en) | 2007-02-02 | 2007-02-02 | A method and system for realizing IP interface between GSM wireless network and core network |
| PCT/CN2008/070249 WO2008098501A1 (en) | 2007-02-02 | 2008-02-02 | Gsm bearing set up method, apparatus and system |
| EP08706625.4A EP2107818B1 (en) | 2007-02-02 | 2008-02-02 | Gsm bearer set up method, apparatus and system |
| EP18207930.1A EP3512226B1 (en) | 2007-02-02 | 2008-02-02 | Method, device and system for establishing a bearer for a gsm network |
| RU2009132931/08A RU2431239C2 (en) | 2007-02-02 | 2008-02-02 | Method, apparatus and system for carrier channel setup in gsm network |
| US12/533,583 US8401029B2 (en) | 2007-02-02 | 2009-07-31 | Method, device and system for establishing a bearer for a GSM network |
| US13/777,618 US20130176944A1 (en) | 2007-02-02 | 2013-02-26 | Method, device and system for establishing a bearer for a gsm network |
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| CN101883310A (en) * | 2010-06-25 | 2010-11-10 | 中兴通讯股份有限公司 | Method and device for optimizing calling mode |
| CN101945420A (en) * | 2010-09-20 | 2011-01-12 | 中兴通讯股份有限公司 | Method and system for establishing media face |
| CN101945418A (en) * | 2010-09-20 | 2011-01-12 | 中兴通讯股份有限公司 | Method and device for establishing media surface |
| CN102378176B (en) * | 2011-10-18 | 2015-07-01 | 京信通信系统（中国）有限公司 | GSM (Global System for Mobile communications) network access system |
| CN103237014B (en) * | 2013-03-28 | 2016-05-04 | 京信通信系统（广州）有限公司 | A kind of data transmission method and device |
| CN104519097B (en) | 2013-09-29 | 2019-05-07 | 中兴通讯股份有限公司 | The acquisition of port block resource, port block resource distribution method and device |
| CN105744488B (en) * | 2014-12-10 | 2021-06-04 | 中兴通讯股份有限公司 | Method and system for establishing cluster service |
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