CN100484293C - A method for selecting code conversion device in voice-over-packet network - Google Patents
A method for selecting code conversion device in voice-over-packet network Download PDFInfo
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- CN100484293C CN100484293C CNB2004100463283A CN200410046328A CN100484293C CN 100484293 C CN100484293 C CN 100484293C CN B2004100463283 A CNB2004100463283 A CN B2004100463283A CN 200410046328 A CN200410046328 A CN 200410046328A CN 100484293 C CN100484293 C CN 100484293C
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Abstract
A method for selecting coding conversion equipment in grouping phonetic loading network, which contains the soft exchange equipment receiving the call establishment information from call user terminal, obtaining first phonetic coding of call user terminal, receiving call progression message from called user terminal, obtaining second phonetic coding from called user terminal, comparing the bandwidth of first and second phonetic coding and selecting coding conversion equipment according to compared result.
Description
Technical field
The present invention relates to the communication technology, particularly relate to the method for selecting code conversion equipment in a kind of packet voice bearer network.
Background technology
At present, next generation network (NGN, Next Generation Network) receives the concern of operator day by day, its advantage mainly is: make networking become easier, operating cost is lower, for emerging communication common carrier brings the extra earning chance, helps operator's reinforcement and user's relation.NGN is not limited to fixed network, can also comprise mobile network etc.Professional packet bearer is one of topmost characteristics of NGN.
NGN can realize broadband multimedia services, but the NGN telephone service is still extremely important at present, and it is that NGN starts business.Existing telephone service terminal comprises conventional terminal, as fixedly ISDN (IntegratedServiced Digital Network) and analog telephone, GSM mobile handset, CDMA mobile phone etc., also comprise the wide-band terminal of supporting multimedia service, as H.323 terminal, SIP (Session Initiation Protocol) terminal, multimedia computer, mobile broadband terminal etc.
Different telephone service terminals is supported different voice encoding and decoding modes.Because the mobile network is than fixed network, its air interface bandwidth is limited, so the speech coding bandwidth of general portable terminal is less, as full-rate codes FR (13K), EFR coding EFR (12.2K) and the half rate encoded HR (5.6K) of present GSM network use, and the variable rate voice AMR coding of 3g mobile network use (4.75K～12.2K.).In the fixed terminal, some only supports traditional PCM voice, it is the G.711 coding of 64K, some then supports the compressed voice coding, comprise G.723.1 (5.3K or 6.3K), G.728 (16K), G.729 (8K), G.726/G.727 (16,24,32Kbps) etc., the bandwidth of these compressed encodings is much smaller than the G.711 coding of 64K.
When supporting the service terminal of different phonetic encoding and decoding to carry out speech communication, need to have the speech coding conversion equipment in the network, convert a side speech coding to speech coding that the opposing party supports, the speech communication of calling both sides is successfully carried out.
In legacy network, the position of speech coding conversion equipment is fixed basically, is positioned at TDM (time division multiplexing) network edge place.This is because traditional TDM circuit switched core network uses 64K G.711 to encode, so the coding outside generally will be G.711 all converts G.711 coding to, transmits in the TDM circuit switched core network then.For example: when H.323 block terminal and PSTN terminal were carried out audio call, G.711 the gateway device between packet network and the PSTN network H.323 compressed voice code conversion of terminal became to encode.
In NGN, the voice flow between code conversion equipment and call subscriber terminal or the called user terminal is carried as packet bearer, and packet bearer comprises ATM and IP dual mode, can carry the voice of various codings, and is not only G.711 to encode.If two terminals have the speech coding of common support, just do not need code conversion equipment so in the network; If the speech coding of two terminal supports is not simultaneously, then need to provide code conversion equipment in the network.
If a plurality of code conversion equipment are arranged in the network,, will influence the bandwidth of Network Transmission greatly to certain position of calling out selected code conversion equipment because the bandwidth of different speech coding is different.For example: when H.323 terminal and sip terminal carry out speech communication, because H.323 the G.723 speech coding of terminal support is far smaller than the G.711 coding of sip terminal, if select the close H.323 code conversion equipment of terminal one side to be placed on, than what select near sip terminal one side, the demand of packet network bandwidth is wanted high a lot.
In the prior art, to the choice of location of code conversion equipment in the NGN network, ununified standard.See also Fig. 1, a kind of prior art is the code conversion equipment of selecting near call subscriber terminal.Its idiographic flow comprises: (SS SoftSwitch) receives the call setup message that call subscriber terminal is initiated to the caller Softswitch, carries speech coding 1 in the described call setup message; Because the coding that called user terminal is supported is different with call subscriber terminal, called user terminal carries speech coding 2 in the call progress class message that called Softswitch sends; Called Softswitch uses speech coding 2 to the indication of caller Softswitch; The caller Softswitch is selected corresponding code conversion equipment near call subscriber terminal; In whole speech communication process, code conversion equipment is finished the encoding and decoding conversion function to the voice flow between call subscriber terminal and the called user terminal.
The defective of described prior art is: when the speech coding bandwidth of call subscriber terminal during less than the speech coding bandwidth of called user terminal, owing to select speech coding conversion equipment near call subscriber terminal, cause the demand of packet network bandwidth is increased.
Summary of the invention
The technical problem that the present invention solves is to provide the method for selecting code conversion equipment in a kind of packet voice bearer network, can choose reasonable code conversion equipment in the packet voice bearer network.
For this reason, the technical scheme of technical solution problem of the present invention is: the method for selecting code conversion equipment in a kind of packet voice bearer network is provided, comprises step:
1) Softswitch receives the call setup message from call subscriber terminal, obtains first speech coding of described call subscriber terminal;
2) Softswitch receives the call progress class message from called user terminal, obtains second speech coding of described called user terminal;
3) bandwidth of more described first speech coding of Softswitch and described second speech coding is selected the code conversion equipment of user terminal one side of high bandwidth according to comparative result.
Wherein, in the described step 1), call setup message carries the first speech coding type information; Described step 2) in, call progress class message is carried the second speech coding type information.
Wherein, in the described step 1), Softswitch obtains the first speech coding type information according to the type of call subscriber terminal; Described step 2) in, Softswitch obtains the second speech coding type information according to the type of called user terminal.
Wherein, described Softswitch comprises caller Softswitch that connects call subscriber terminal and the called Softswitch that connects called user terminal.
Wherein, described step 3) specifically comprises:
311) whether called Softswitch identification call subscriber terminal is different with the speech coding of called user terminal support; If identical, then do not select code conversion equipment; If different, then enter step 312);
312) bandwidth of comparison different speech coding; If the bandwidth of first speech coding is less than the bandwidth of second speech coding, then execution in step 313); If the bandwidth of second speech coding is less than the bandwidth of first speech coding, then execution in step 314 and 315);
313) called Softswitch judges whether to satisfy the code conversion equipment of first and second speech codings conversion demand, if do not have, then forwards step 314 to); If have, then select aforementioned code conversion equipment;
314) called Softswitch returns call progress class message to the caller Softswitch, carries second speech coding that called user terminal is supported;
315) the caller Softswitch selects to satisfy the code conversion equipment of first and second speech codings conversion demand.
Wherein, when step 315) in the caller Softswitch do not have suitable code conversion equipment, then carry out
316) the caller Softswitch returns call progress class message to called Softswitch, carries first speech coding;
317) called Softswitch judges whether to satisfy the code conversion equipment of first and second speech codings conversion demand, if do not have, and call failure then; If have, then select aforementioned code conversion equipment.
Wherein, process tandem Softswitch between caller Softswitch and called Softswitch.
Wherein, described call subscriber terminal and called user terminal belong to same Softswitch.
Wherein, after step 3), also comprise step:
4) Softswitch sends call progress class message, the information of carrying described code conversion equipment;
5) user terminal is set up communication with this code conversion equipment respectively according to the information of the code conversion equipment that receives.
With respect to prior art, the invention has the beneficial effects as follows: because Softswitch of the present invention obtains the speech coding of call subscriber terminal and called user terminal, to its bandwidth and compare, then according to comparative result choose reasonable code conversion equipment, compare with simple employing of prior art near the code conversion equipment of call subscriber terminal one side, when the speech coding bandwidth of call subscriber terminal during, can make the bandwidth demand of voice flow data in the packet bearer network obtain saving less than the speech coding bandwidth of called user terminal.
Description of drawings
Fig. 1 is a flow chart of selecting code conversion equipment in a kind of packet voice bearer network of prior art;
Fig. 2 is the general schematic network structure of packet voice bearer network;
Fig. 3 is the flow chart of one embodiment of the present invention.
Embodiment
In the packet voice bearer network, the speech coding of supporting when call subscriber terminal and called user terminal need provide code conversion equipment not simultaneously in network.Usually have a plurality of code conversion equipment in the network, and be positioned at diverse location, be subjected to the control of different Softswitch.The present invention propose a kind of in the packet voice bearer network method of choose reasonable code conversion equipment, thereby save the bandwidth demand of voice in packet carrying network.
Seeing also Fig. 2, is the general network configuration of packet voice bearer network.Comprise caller Softswitch, called Softswitch and a plurality of code conversion equipment.By the Softswitch size of the bandwidth of the speech coding supported of call subscriber terminal and called user terminal relatively, select code conversion equipment near user terminal one side of high bandwidth, call subscriber terminal and called user terminal carry out communication with this code conversion equipment respectively, and this code conversion equipment of soft exchange device controls is finished the speech coding translation function in communication process.
Seeing also Fig. 3, is the flow chart of an embodiment of data transmission method of the present invention.
Call subscriber terminal makes a call and sets up message, carries the speech coding of self supporting 1.
The caller Softswitch makes a call to called Softswitch and sets up message, carries the speech coding 1 that call subscriber terminal is supported.
Called Softswitch makes a call to called user terminal and sets up message, carries the speech coding 1 that call subscriber terminal is supported.
Called user terminal sends call progress class message to called Softswitch, returns the speech coding of self supporting 2.
Whether called Softswitch identification call subscriber terminal is different with the speech coding that called user terminal is supported; If identical, then do not select code conversion equipment; If different, the bandwidth of different speech coding relatively then.If the bandwidth of speech coding 1 is then carried out sub-process P1 less than the bandwidth of speech coding 2; If the bandwidth of speech coding 2 is then carried out sub-process P2 less than the bandwidth of speech coding 1.
Wherein, sub-process P1 comprises:
Called Softswitch judges whether to satisfy the suitable code conversion equipment (called Softswitch generally can be judged according to the configuring condition and the operating position of resource) of speech coding 1 and 2 conversion demands, if do not have, then forwards sub-process P2 to; If have, then continue to carry out the subsequent step of sub-process P1.
Called Softswitch returns call progress class message, the address of carrying speech coding 1 and code conversion equipment to the caller Softswitch; The caller Softswitch returns call progress class message, the address of carrying speech coding 1 and code conversion equipment to call subscriber terminal.Called Softswitch returns call progress class message, the address of carrying speech coding 2 and code conversion equipment to called user terminal.
After called Softswitch is selected code conversion equipment, this code conversion equipment of control in the subsequent communications process (be that Softswitch and code conversion equipment carry out alternately, as issue various command, require code conversion equipment to report some data etc.); User terminal (comprising call subscriber terminal and called user terminal) is set up speech communication with this code conversion equipment respectively according to the address of the code conversion equipment of receiving, realizes the transmission of data.
Sub-process P2 comprises:
Called Softswitch returns call progress class message to the caller Softswitch, carries the speech coding 2 that called user terminal is supported.
The caller Softswitch selects whether to have the suitable code conversion equipment that satisfies speech coding 1 and 2 conversion demands, if do not have, then carries out the sub-process P3 of abnormality processing; If have, then continue to carry out the subsequent step of sub-process P2.
The caller Softswitch returns call progress class message, the address of carrying speech coding 2 and code conversion equipment to called Softswitch; The caller Softswitch returns call progress class message, the address of carrying speech coding 1 and code conversion equipment to call subscriber terminal.Called Softswitch returns call progress class message, the address of carrying speech coding 2 and code conversion equipment to called user terminal.
After the caller Softswitch is selected code conversion equipment, this code conversion equipment of control in the subsequent communications process; User terminal (comprising call subscriber terminal and called user terminal) is set up speech communication with this code conversion equipment respectively according to the address of the code conversion equipment of receiving, realizes the transmission of data.
Sub-process P3 comprises:
The caller Softswitch returns call progress class message to called Softswitch, carries speech coding 1;
Called Softswitch judges whether to satisfy the suitable code conversion equipment of speech coding 1 and 2 conversion demands, if do not have, and call failure then; If have, then continue to carry out subsequent step.
Called Softswitch returns call progress class message, the address of carrying speech coding 1 and code conversion equipment to the caller Softswitch; Called Softswitch returns call progress class message, the address of carrying speech coding 2 and code conversion equipment to called user terminal.
The caller Softswitch returns call progress class message, the address of carrying speech coding 1 and code conversion equipment to call subscriber terminal.
After called Softswitch is selected code conversion equipment, this code conversion equipment of control in the subsequent communications process; User terminal (comprising call subscriber terminal and called user terminal) is set up speech communication with this code conversion equipment respectively according to the address of the code conversion equipment of receiving, realizes the transmission of data.
Be understandable that among the present invention, call progress class message is not refered in particular to some or several messages related to calls, but voice bearer connects the general designation of the message related to calls before setting up.
In the described execution mode shown in Figure 3, expression be that calling subscriber and called subscriber are positioned at two Softswitch, and the situation of two direct communications of Softswitch.But the present invention is not limited to this execution mode.
In another embodiment of the present invention, call subscriber terminal and called user terminal are positioned at same Softswitch.If there is not or has only a code conversion equipment under the soft exchange device controls, there is not the selection problem so.If a plurality of code conversion equipment are arranged under the soft exchange device controls, just need to select a code conversion equipment.
At first, Softswitch obtains the speech coding type of call subscriber terminal and called user terminal respectively;
Softswitch compares the bandwidth of speech coding, and selects code conversion equipment according to comparative result.
If Softswitch can utilize certain information to judge, address informations such as domain name/number as calling subscriber/called subscriber/code conversion equipment, then select the code conversion equipment of the user terminal of the most close high bandwidth speech coding, and this code conversion equipment is controlled; If can not select the code conversion equipment of the user terminal of the most close high bandwidth speech coding by certain way, then select a code conversion equipment arbitrarily; User terminal is set up speech communication with this code conversion equipment respectively, realizes the transmission of data.
In the another embodiment of the invention, calling subscriber and called subscriber are positioned at two Softswitch, several tandem Softswitch of process in the middle of the call control signalling.If caller Softswitch or called Softswitch have suitable code conversion equipment selective, then the tandem Softswitch is only done transparent transmission to call control signalling.If caller Softswitch or called Softswitch do not have suitable code conversion equipment selective, then when the tandem Softswitch recognizes call subscriber terminal and called user terminal support different speech coding, need to judge the amount of bandwidth of speech coding, promptly finish called Softswitch similar functions, select code conversion equipment as required and control.
What need further specify is, among the present invention, and the interoffice signaling between the Softswitch, the subscriber signaling between user terminal and the Softswitch can have different choice.
Among the present invention, the approach that Softswitch obtains the speech coding of user terminal can have different choice.Can initiatively report the speech coding of self supporting as some user terminal; Some can not initiatively report, at this moment need Softswitch to judge (as static configuration user type in Softswitch according to the type of user terminal, and may in subsequent call messages, carry this speech coding type the speech coding type that certain user's type is corresponding fixing).
Be appreciated that the present invention can be applicable to fixing or mobile packet voice bearer network, user terminal comprises mobile subscriber terminal and/or fixing user terminal, comprises legacy user terminals and/or wideband subscriber terminal.Wherein Softswitch comprises the Softswitch equipment of fixed network, mobile network's Mobile Switching Center Server (MSC Server), SIP portable terminal server etc.
Code conversion equipment is autonomous device not necessarily, can be a part that belongs to media gateway or media resource node.Code conversion equipment and Softswitch also can be integrated in the switching equipment.
In addition, the present invention is mainly used in telephone service, but does not get rid of the multimedia service outside the telephone service, and the voice flow in the multimedia service is worked.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, select the method for code conversion equipment in a kind of packet voice bearer network, it is characterized in that, comprise step:
1) Softswitch receives the call setup message from call subscriber terminal, obtains first speech coding of described call subscriber terminal;
2) Softswitch receives the call progress class message from called user terminal, obtains second speech coding of described called user terminal;
3) bandwidth of more described first speech coding of Softswitch and described second speech coding is selected the code conversion equipment of user terminal one side of high bandwidth according to comparative result.
2, the method for selection code conversion equipment according to claim 1 is characterized in that: in the described step 1), call setup message carries the first speech coding type information; Described step 2) in, call progress class message is carried the second speech coding type information.
3, the method for selection code conversion equipment according to claim 1 is characterized in that: in the described step 1), Softswitch obtains the first speech coding type information according to the type of call subscriber terminal; Described step 2) in, Softswitch obtains the second speech coding type information according to the type of called user terminal.
4, the method for selection code conversion equipment according to claim 1 is characterized in that: described Softswitch comprises caller Softswitch that connects call subscriber terminal and the called Softswitch that connects called user terminal.
5, the method for selection code conversion equipment according to claim 4, it is characterized in that: described step 3) specifically comprises:
311) whether called Softswitch identification call subscriber terminal is different with the speech coding of called user terminal support; If identical, then do not select code conversion equipment; If different, then enter step 312);
312) bandwidth of comparison different speech coding; If the bandwidth of first speech coding is less than the bandwidth of second speech coding, then execution in step 313); If the bandwidth of second speech coding is less than the bandwidth of first speech coding, then execution in step 314 and 315);
313) called Softswitch judges whether to satisfy the code conversion equipment of first and second speech codings conversion demand, if do not have, then forwards step 314 to); If have, then select aforementioned code conversion equipment;
314) called Softswitch returns call progress class message to the caller Softswitch, carries second speech coding that called user terminal is supported;
315) the caller Softswitch selects to satisfy the code conversion equipment of first and second speech codings conversion demand.
6, the method for selection code conversion equipment according to claim 4 is characterized in that: when step 315) in the caller Softswitch do not have suitable code conversion equipment, then carry out
316) the caller Softswitch returns call progress class message to called Softswitch, carries first speech coding;
317) called Softswitch judges whether to satisfy the code conversion equipment of first and second speech codings conversion demand, if do not have, and call failure then; If have, then select aforementioned code conversion equipment.
7, the method for selection code conversion equipment according to claim 4 is characterized in that: process tandem Softswitch between caller Softswitch and called Softswitch.
8, the method for selection code conversion equipment according to claim 1, it is characterized in that: described call subscriber terminal and called user terminal belong to same Softswitch.
9, according to the method for each described selection code conversion equipment of claim 1 to 8, it is characterized in that, after step 3), also comprise step:
4) Softswitch sends call progress class message, the information of carrying described code conversion equipment;
5) user terminal is set up communication with this code conversion equipment respectively according to the information of the code conversion equipment that receives.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100463283A CN100484293C (en) | 2004-06-03 | 2004-06-03 | A method for selecting code conversion device in voice-over-packet network |
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| CNB2004100463283A CN100484293C (en) | 2004-06-03 | 2004-06-03 | A method for selecting code conversion device in voice-over-packet network |
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| CN100484293C true CN100484293C (en) | 2009-04-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102577262A (en) * | 2009-10-23 | 2012-07-11 | 富士通株式会社 | Communication system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108986828B (en) * | 2018-08-31 | 2021-05-28 | 北京中兴高达通信技术有限公司 | Call establishment method and device, storage medium and electronic device |
| CN112887497B (en) * | 2020-12-24 | 2022-11-01 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Communication method, apparatus and computer storage medium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102577262A (en) * | 2009-10-23 | 2012-07-11 | 富士通株式会社 | Communication system |
| CN102577262B (en) * | 2009-10-23 | 2015-10-14 | 富士通株式会社 | Communication system |
| US9407531B2 (en) | 2009-10-23 | 2016-08-02 | Fujitsu Limited | Communication system |
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| CN1705403A (en) | 2005-12-07 |
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