CN101282284B - Gateway-across dual-tone multi-frequency conveying method and apparatus - Google Patents
Gateway-across dual-tone multi-frequency conveying method and apparatus Download PDFInfo
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- CN101282284B CN101282284B CN2007100907428A CN200710090742A CN101282284B CN 101282284 B CN101282284 B CN 101282284B CN 2007100907428 A CN2007100907428 A CN 2007100907428A CN 200710090742 A CN200710090742 A CN 200710090742A CN 101282284 B CN101282284 B CN 101282284B
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Abstract
The invention provides a method and a device for cross-gateway dual-tone multi-frequency transmission; wherein, the method comprises the following steps of: the step S302, after call establishment, accessing a subsystem of a base station to a media gateway through time division multiplexing, analyzing a pulse coding modulation code received on the media gateway; the step S304, according to the analyzed result, undergoing corresponding treatment, and sending the result a media gateway of the next hop; and the step S306, on the out media gateway, undergoing corresponding treatment according to load type field of a received real time transmission protocol message, and transmitting the result of the treatment to a user of a public switched telephone network; therefore, the invention guarantees number receiving correctness of dual-tone multi-frequency with reinforced variable speed code/decode format transmission, and saves transmission bandwidth.
Description
Technical field
The present invention relates to the communications field, more specifically, the present invention relates to gateway-across dual-tone multi-frequency conveying method and device in a kind of CDMA (CodeDivision Multiple Access, code division multiple access) system.
Background technology
In the communications field, along with the differentiation of 3G (3rd Generation was called for the 3rd generation) mobile communication, the mobile communications network framework is divided into wireless access mesh portions and core net part.
As shown in Figure 1, (the Mobile Switching Center of mobile switching centre, abbreviate MSC as) develop into mobile switching center emulation (Mobile Switching Center Emulation abbreviates MSCe as) and media gateway (Media Gate Way, abbreviate MGW as) two parts, realized separating of control and carrying, and replace time division multiplexing (Time Division Multiplex abbreviates TDM as) circuit-switched technology with the Packet Based Network technology.Wherein, MSCe provides and calls out control and mobile management function, and MGW provides media control function, and transfer resource is provided, and has the Media Stream operating function.MSCe and MGW belong to two network elements of core net.Separating of control and carrying, the sign indicating number type translation function that is positioned at base station sub-system (BaseStation Sub-system abbreviates BSS as) is in the past moved among the MGW and is realized.BSS is linked into core net by A interface (interface between MSC and the BSS), and the A interface develops into the RTP transmission technology from traditional TDM transmission technology, and wherein A1 and A2 interface are all based on the TDM transmission technology, and A1p and A2p interface are all based on the RTP transmission technology.(be called the yy interface) between the MGW and adopt the RTP transmission.
In order to save transmission bandwidth to greatest extent, yy interface between MGW also adopts the compressed packet form to carry out the transferring voice message, according to second group of third generation partner program (3rd Generation Partnership Project2, abbreviate 3GPP2 as) the agreement regulation, essential support of enhanced variable bit rate encoding and decoding (the Enhanced VariableRate Codec of cdma system, abbreviate EVRC as) encoding and decoding of form, therefore in cdma system, can adopt the EVRC form to carry out the transferring voice message between the MGW.
BSS is linked into MGW by the A2p interface, and travelling carriage (Mobile Station abbreviates MS as) is done further processing after the compressed voice bag of BSS is sent to MGW by the RTP message; BSS is linked into MGW by the A2 interface, and MS is decoded as pulse code modulation (Pulse CodeModule abbreviates PCM as) code stream to the vocoder that the compressed voice bag of BSS is positioned at B SS, and pcm stream is transferred to the processing of doing next step behind the MGW by TDM.If a calling of striding MGW, voice need transmit between MGW, can adopt the EVRC form to carry out the carrying of voice message between MGW in order to save bandwidth.
Yy mouth between MGW adopts EVRC compressed format to come transferring voice can save bandwidth, but the EVRC compress speech can be brought certain damage to PCM, though do not influence normal conversation, but may cause demand not to be satisfied for some special demands, for example, to collect the digits be exactly wherein a kind of situation to the DTMF that closes of inter-network.
Fig. 2 has described in the prior art, MS calls out public switched telephone network (PublicSwitched Telephone Network, abbreviate PSTN as) the user's voice flow chart, in Fig. 2, only having described the flow chart in the conversation after access success is set up, is the treatment step of the Media Stream during both sides converse below:
Step 202, MS is linked into MGW by BSS, calls out PSTN user, and after access success was set up, in communication process, MS was decoded as pcm stream to the compressed voice bag of BSS and is transferred to MGW by the A2 interface;
Step S204, MGW is encoded to EVRC sign indicating number bag to the pcm stream that receives, and EVRC sign indicating number bag is broken into RTP (realtimetransmit protocol abbreviates RTP as) message according to the RFC3558 form send to the MGW of next jumping;
Step S206, MGW is decoded as pcm stream to the EVRC sign indicating number bag that receives and is transferred to PSTN, and PSTN user just can hear the sound of MS; And
Step S208, this flow process is that PSTN user handles to the voice flow of MS, MS can hear PSTN user's sound.
As above, be linked into by the A2 interface in the conversation procedure of MGW at BSS, the DTMF numeral arrives BSS from eating dishes without rice or wine, to local exchange MSC, therefore, BSS need produce the pcm stream that contains dtmf tone according to the DTMF numeral to the DTMF numeral by in-band signalling then, if there is the DTMF the stride MGW business that collects the digits, do EVRC coding at the MGW of Incoming, do an EVRC decoding, can cause the DTMF success rate that collects the digits to descend very big like this at the MGW of striking out.
Therefore, need a kind of gateway-across dual-tone multi-frequency conveying method and device to solve the problems referred to above.
Summary of the invention
In order to address the above problem, the invention provides a kind of gateway-across dual-tone multi-frequency conveying method and device, be linked into the collect the digits problem of success rate decline of the yy interface adopts the EVRC form to stride MGW between MGW and the MGW DTMF by A2 interface (based on the TDM circuit transmission) to solve BSS.
One aspect of the present invention provides a kind of gateway-across dual-tone multi-frequency conveying method, may further comprise the steps: step S302, after setting up calling, base station sub-system is linked into media gateway by time division multiplexing, on media gateway the impulse coding modulation code that receives is analyzed; Step S304 according to the result who is analyzed, handles and sends to the media gateway of next jumping accordingly; And step S306, on the media gateway of striking out, handle accordingly, and send result to the public switched telephone network user according to the load type field in the live transmission protocol message that receives.
According to an aspect of the present invention, in step S304, when in the result who is analyzed is received impulse coding modulation code, having the dual-tone multifrequency numeral, media gateway is extracted the dual-tone multifrequency numeral from impulse coding modulation code, and encapsulates to be packaged into live transmission protocol message according to first predetermined format.
Wherein, in step S304, when in the result who is analyzed is received impulse coding modulation code, not having the dual-tone multifrequency numeral, MGW carries out impulse coding modulation code the coding of enhanced variable rate code/decode format, form the sign indicating number bag of enhanced variable rate code/decode format, and be packaged into live transmission protocol message according to second predetermined format.
In addition, in step S306, when the live transmission protocol message that receives is the sign indicating number bag of enhanced variable rate code/decode format, out MGW wraps the decoding processing of carrying out the enhanced variable rate code/decode format to the sign indicating number of enhanced variable rate code/decode format, and the sign indicating number bag of enhanced variable rate code/decode format is decoded as impulse coding modulation code stream.And when the live transmission protocol message that receives was the dual-tone multifrequency message, out MGW extracted the dual-tone multifrequency numeral from the dual-tone multifrequency message, and generated DTMF tone according to the dual-tone multifrequency numeral.
According to an aspect of the present invention, first predetermined format is the RFC2833 form, and second predetermined format is the RFC3558 form.
Another aspect of the present invention provides a kind of gateway-across dual-tone multi-frequency conveyer, it comprises: analytic unit, be used for after setting up calling, on the media gateway that base station sub-system is linked into by time division multiplexing, the impulse coding modulation code that receives being analyzed; First processing unit is positioned on the media gateway, is used for according to the result who is analyzed, and handles and send to the MGW of next jumping accordingly; And second processing unit, be positioned on the out MGW, handle accordingly according to the type of the load type field in the live transmission protocol message that receives, and result is sent to the public switched telephone network user.
According to a further aspect in the invention, when having the dual-tone multifrequency numeral in the received impulse coding modulation code, first processing unit is used for: extract the dual-tone multifrequency numeral from impulse coding modulation code, and encapsulate to be packaged into live transmission protocol message according to first predetermined format.
In addition, when not having the dual-tone multifrequency numeral in the received impulse coding modulation code, first processing unit is used for: the coding that impulse coding modulation code is carried out the enhanced variable rate code/decode format, form the sign indicating number bag of enhanced variable rate code/decode format, and according to second predetermined format packing live transmission protocol message.
According to a further aspect in the invention, when the live transmission protocol message that receives is the sign indicating number bag of enhanced variable rate code/decode format, second processing unit is used for: the sign indicating number to the enhanced variable rate code/decode format wraps the decoding processing of carrying out the enhanced variable rate code/decode format, and the sign indicating number bag of enhanced variable rate code/decode format is decoded as impulse coding modulation code stream.
In addition, when the live transmission protocol message that receives was the dual-tone multifrequency message, second processing unit was used for: extract the dual-tone multifrequency numeral from the dual-tone multifrequency message, and generate DTMF tone according to the dual-tone multifrequency numeral.First predetermined format is the RFC2833 form, and second predetermined format is the RFC3558 form.
As mentioned above, the invention solves base station sub-system as can be seen inserts the medium webmaster by time division multiplexing and strides the problem that number that media gateway adopts the dual-tone multifrequency of enhanced variable rate code/decode format to collect the digits is lost.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is that BSS adopts the TDM transmission to insert the schematic diagram of CDMA2000 system configuration in the prior art;
Fig. 2 is that BSS adopts the TDM transmission to insert and stride the flow chart that MGW calls out the PSTN user speech in the prior art;
Fig. 3 is the flow chart according to gateway-across dual-tone multi-frequency conveying method of the present invention;
Fig. 4 is the process chart that inserts and stride MGW employing EVRC carrying according to the BSS employing TDM transmission of the embodiment of the invention; And
Fig. 5 is the block diagram according to gateway-across dual-tone multi-frequency conveyer of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Fig. 3 is the flow chart according to gateway-across dual-tone multi-frequency conveying method of the present invention, and as shown in Figure 3, gateway-across dual-tone multi-frequency conveying method may further comprise the steps:
Step S302, after setting up calling, base station sub-system is linked into media gateway by time division multiplexing, on media gateway the impulse coding modulation code that receives is analyzed;
Step S304 according to the result who is analyzed, handles and sends to the media gateway of next jumping accordingly; And
Step S306, on the media gateway of striking out, according to the RTP that receives (realtime transmit protocol, abbreviate RTP as) load type (payloadtype of message, abbreviating PT as) field handles accordingly, and sends result to the public switched telephone network user.
Wherein, in step S304, when having the dual-tone multifrequency numeral in the result who is analyzed is received impulse coding modulation code, media gateway is extracted the dual-tone multifrequency numeral from impulse coding modulation code, and encapsulates to be packaged into the RTP message according to first predetermined format.And work as the result who is analyzed is when not having the dual-tone multifrequency numeral in the received impulse coding modulation code, MGW carries out impulse coding modulation code the coding of enhanced variable rate code/decode format, form the sign indicating number bag of enhanced variable rate code/decode format, and be packaged into the RTP message according to second predetermined format.
In addition, in step S306, when the RTP message that receives is the sign indicating number bag of enhanced variable rate code/decode format, out MGW wraps the decoding processing of carrying out the enhanced variable rate code/decode format to the sign indicating number of enhanced variable rate code/decode format, and the sign indicating number bag of enhanced variable rate code/decode format is decoded as impulse coding modulation code stream.And when the RTP message that receives was the dual-tone multifrequency message, out MGW extracted the dual-tone multifrequency numeral from the dual-tone multifrequency message, and generated DTMF tone according to the dual-tone multifrequency numeral.
According to the present invention, first predetermined format is the RFC2833 form, and second predetermined format is the RFC3558 form.
Fig. 4 is that BSS adopts the TDM transmission to insert and stride the process chart that MGW adopts the EVRC carrying according to an embodiment of the invention.Describe main thought of the present invention with reference to embodiment shown in Figure 4, by foregoing description as can be known, BSS is linked into MGW by TDM, and the bear format of the yy interface between the MGW is EVRC, can save transmission bandwidth like this.Therefore, as shown in Figure 4, behind call setup, may further comprise the steps:
Step S402, MS is linked into MGW by BSS, calls out PSTN user, and after access success was set up, MS was decoded as pcm stream to the compressed package of BSS, and pcm stream is transferred to MGW by the A2 interface;
Step S404, MGW does dtmf tone to the pcm stream that receives and detects, if dtmf tone is arranged in the pcm stream, then does the detection of dtmf tone, and the DTMF digital extraction is come out; If detect and contain dtmf tone in the pcm stream, dtmf tone in the pcm stream is disposed, as shown in Figure 4, in two kinds of situation the RTP message is dealt into next and jumps MGW, a kind of is if extract the DTMF numeral from pcm stream, then the DTMF numeral being broken into the RTP message according to the form of RFC2833 agreement delivers to next and jumps MGW, another kind is if do not extract the DTMF numeral from pcm stream, then pcm stream is done EVRC coding, and EVRC sign indicating number bag RFC3558 form is broken into the RTP message send to next jumping MGW;
Step S406, MGW divides two steps to handle after receiving the RTP message that a MGW who jumps sends over, if what receive is EVRC sign indicating number bag, EVRC sign indicating number bag is decoded as pcm stream, pcm stream is delivered to PSTN, and if what receive is the message of DTMF form, produce dtmf tone according to the DTMF numeral of message the inside, dtmf tone is delivered to PSTN, PSTN correctly detects the DTMF numeral after receiving pcm stream, parses the extension of MS input, and does further calling according to this number; And
Step S408, PSTN user handles to the voice flow of MS, and MS can hear PSTN user's sound.
The main thought of present embodiment is: the media gateway that base station sub-system inserts is come out the double frequency multitone digital extraction in the impulse coding modulation code stream, then double frequency multitone numeral is broken into the media gateway that the RTP message sends to next jumping according to the form of RFC2833, media gateway in striking out extracts double frequency multitone numeral and sends according to double frequency multitone numeral generation double frequency multitone from the RTP message, guarantee that the double frequency multitone can be correctly validated.
In the present embodiment, should be noted that to be that MS needs to dial extension according to prompt tone again after getting through the PSTN exchange, process is as follows:
(1) PSTN gives MS playback prompting MS input extension;
(2) MS imports extension after hearing prompt tone, and extension just is sent to 2G BSS by idle message; And
(3) BSS produces dtmf tone according to the DTMF numeral of DTMF message the inside, by the A2 interface pcm stream that contains dtmf tone is transferred to MGW, and at this moment dtmf signaling transfers in-band signalling to.
The gateway-across dual-tone multi-frequency conveyer 500 of realizing said method is described hereinafter with reference to Fig. 5, Fig. 5 is the block diagram according to gateway-across dual-tone multi-frequency conveyer 500 of the present invention, as shown in Figure 5, this device comprises: analytic unit 502, be used for after setting up calling, on the media gateway that base station sub-system is linked into by time division multiplexing, the impulse coding modulation code that receives being analyzed; First processing unit 504 is positioned on the media gateway, is used for according to the result who is analyzed, and handles and send to the MGW of next jumping accordingly; And second processing unit 506, be positioned on the out MGW, handle accordingly according to the PT field of the RTP message that receives, and result is sent to the public switched telephone network user.
When having the dual-tone multifrequency numeral in the received impulse coding modulation code, first processing unit 504 is used for extracting the dual-tone multifrequency numeral from impulse coding modulation code, and encapsulates to be packaged into the RTP message according to first predetermined format.
In addition, when not having the dual-tone multifrequency numeral in the received impulse coding modulation code, first processing unit 504 is used for impulse coding modulation code is carried out the coding of enhanced variable rate code/decode format, form the sign indicating number bag of enhanced variable rate code/decode format, and be packaged into the RTP message according to second predetermined format.
When the RTP message that receives is the sign indicating number bag of enhanced variable rate code/decode format, second processing unit 506 is used for the sign indicating number bag of enhanced variable rate code/decode format is carried out the decoding processing of enhanced variable rate code/decode format, and the sign indicating number bag of enhanced variable rate code/decode format is decoded as impulse coding modulation code stream.
In addition, when the RTP message that receives was the dual-tone multifrequency message, second processing unit 506 was used for extracting the dual-tone multifrequency numeral from the dual-tone multifrequency message, and generated DTMF tone according to the dual-tone multifrequency numeral.
As mentioned above, in the present embodiment, first predetermined format is the RFC2833 form; Second predetermined format is the RFC3558 form.
From the foregoing description, the present invention has realized following technique effect as can be seen: when having avoided the yy interface employing EVRC form between MGW, MGW does the EVRC coding to the pcm stream that inserts, when the MGW of striking out does the EVRC decoding, the damage that DTMF is caused and cause the collect the digits decline of success rate of DTMF, and on the MGW of TDM Incoming, the DTMF digital extraction is come out, MGW in striking out produces dtmf tone according to the DTMF numeral then, DTMF when both having guaranteed to adopt the transmission of EVRC form collects the digits and can correctly collect the digits, and has saved transmission bandwidth again.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a gateway-across dual-tone multi-frequency conveying method is characterized in that, may further comprise the steps:
Step S302, after setting up calling, base station sub-system is linked into media gateway by time division multiplexing, on described media gateway the impulse coding modulation code that receives is analyzed;
Step S304, according to the result who is analyzed, handle and send to the media gateway of next jumping accordingly, wherein, when in the result who is analyzed is received described impulse coding modulation code, having the dual-tone multifrequency numeral, described media gateway is extracted described dual-tone multifrequency numeral from described impulse coding modulation code, and encapsulates to be packaged into live transmission protocol message according to first predetermined format; When in the result who is analyzed is received described impulse coding modulation code, not having described dual-tone multifrequency numeral, described media gateway is carried out described impulse coding modulation code the coding of enhanced variable rate code/decode format, form the sign indicating number bag of enhanced variable rate code/decode format, and be packaged into described live transmission protocol message according to second predetermined format; And
Step S306 on the media gateway of striking out, handles accordingly according to the load type field of the live transmission protocol message that receives, and sends result to the public switched telephone network user.
2. gateway-across dual-tone multi-frequency conveying method according to claim 1, it is characterized in that, in described step S306, when the described live transmission protocol message that receives is the sign indicating number bag of described enhanced variable rate code/decode format, the media gateway of described striking out is wrapped the decoding processing of carrying out the enhanced variable rate code/decode format to the sign indicating number of described enhanced variable rate code/decode format, and the sign indicating number bag of described enhanced variable rate code/decode format is decoded as impulse coding modulation code stream.
3. gateway-across dual-tone multi-frequency conveying method according to claim 1, it is characterized in that, in described step S306, when the described live transmission protocol message that receives is the dual-tone multifrequency message, the media gateway of described striking out is extracted described dual-tone multifrequency numeral from described dual-tone multifrequency message, and generates DTMF tone according to described dual-tone multifrequency numeral.
4. gateway-across dual-tone multi-frequency conveying method according to claim 1 is characterized in that, described first predetermined format is the RFC2833 form.
5. gateway-across dual-tone multi-frequency conveying method according to claim 1 is characterized in that, described second predetermined format is the RFC3558 form.
6. a gateway-across dual-tone multi-frequency transfer system is characterized in that, comprising:
Analytic unit is used on the media gateway that base station sub-system is linked into by time division multiplexing the impulse coding modulation code that receives being analyzed after setting up calling;
First processing unit, be positioned on the described media gateway, be used for according to the result who is analyzed, handle and send to the media gateway of next jumping accordingly, wherein, when having the dual-tone multifrequency numeral in the received described impulse coding modulation code, described first processing unit is used for extracting described dual-tone multifrequency numeral from described impulse coding modulation code, and encapsulates to be packaged into live transmission protocol message according to first predetermined format; When not having described dual-tone multifrequency digital in the received described impulse coding modulation code, described first processing unit is used for described impulse coding modulation code is carried out the coding of enhanced variable rate code/decode format, form the sign indicating number bag of enhanced variable rate code/decode format, and be packaged into described live transmission protocol message according to second predetermined format; And
Second processing unit is positioned on the out media gateway, handles accordingly according to the load type of the live transmission protocol message that receives, and result is sent to the public switched telephone network user.
7. gateway-across dual-tone multi-frequency transfer system according to claim 6 is characterized in that, when the described live transmission protocol message that receives was the sign indicating number bag of described enhanced variable rate code/decode format, described second processing unit was used for:
Sign indicating number to described enhanced variable rate code/decode format wraps the decoding processing of carrying out the enhanced variable rate code/decode format, and the sign indicating number bag of described enhanced variable rate code/decode format is decoded as impulse coding modulation code stream.
8. gateway-across dual-tone multi-frequency transfer system according to claim 6 is characterized in that, when the described live transmission protocol message that receives was the dual-tone multifrequency message, described second processing unit was used for:
From described dual-tone multifrequency message, extract described dual-tone multifrequency numeral, and generate DTMF tone according to described dual-tone multifrequency numeral.
9. gateway-across dual-tone multi-frequency transfer system according to claim 6 is characterized in that, described first predetermined format is the RFC2833 form.
10. gateway-across dual-tone multi-frequency transfer system according to claim 6 is characterized in that, described second predetermined format is the RFC3558 form.
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| CN102055516B (en) * | 2009-11-09 | 2014-12-17 | 中兴通讯股份有限公司 | DTMF (dual-tone multifrequency) sound transferring method and device |
| CN102217367B (en) * | 2011-06-03 | 2014-08-13 | 华为技术有限公司 | An adjusting method of coding and decoding rate, a device and a media gateway thereof |
| CN103888985A (en) * | 2012-12-21 | 2014-06-25 | 华为技术有限公司 | Information transmission method, media gateway and base station controller |
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| EP1553790A1 (en) * | 2004-01-07 | 2005-07-13 | Siemens Aktiengesellschaft | Mobile radio network of the 3GPP-type and operating method therefor |
| CN1870785A (en) * | 2005-11-15 | 2006-11-29 | 华为技术有限公司 | Method for implement secondary coding-decoding operation service at cross-packet network and media gateway |
| CN1878399A (en) * | 2005-11-29 | 2006-12-13 | 华为技术有限公司 | Method for carrying out encryption transfer on 2833 information in CDMA |
| CN1921478A (en) * | 2005-08-26 | 2007-02-28 | 华为技术有限公司 | Business signal transmitting method based on network agreement |
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| EP1553790A1 (en) * | 2004-01-07 | 2005-07-13 | Siemens Aktiengesellschaft | Mobile radio network of the 3GPP-type and operating method therefor |
| CN1921478A (en) * | 2005-08-26 | 2007-02-28 | 华为技术有限公司 | Business signal transmitting method based on network agreement |
| CN1870785A (en) * | 2005-11-15 | 2006-11-29 | 华为技术有限公司 | Method for implement secondary coding-decoding operation service at cross-packet network and media gateway |
| CN1878399A (en) * | 2005-11-29 | 2006-12-13 | 华为技术有限公司 | Method for carrying out encryption transfer on 2833 information in CDMA |
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