CN101378529A - Method and system for implementing encode/decode-free operation - Google Patents
Method and system for implementing encode/decode-free operation Download PDFInfo
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- CN101378529A CN101378529A CNA2007101210473A CN200710121047A CN101378529A CN 101378529 A CN101378529 A CN 101378529A CN A2007101210473 A CNA2007101210473 A CN A2007101210473A CN 200710121047 A CN200710121047 A CN 200710121047A CN 101378529 A CN101378529 A CN 101378529A
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Abstract
The invention relates to a realizing method free of encoding and decoding operations, and a system thereof, wherein, the method comprises the steps that: after respectively receiving a consultation request message from an opposite terminal, a calling terminal TC and a called terminal TC judge whether both encoding manners adopted by the two terminals pertain to the AMR mode and are the same; when both encoding manners adopted by the two terminals pertain to the AMR mode but are different, the encoding manner adopted by the home terminal is switched into an encoding manner with relatively low encoding speed in the encoding manners adopted by the calling terminal and the called terminal; TFO frame transparent transmission is carried out based on the same encoding manner after switching. The system comprises a code converter and a base station controller. As TFO code set consultation process in the prior art is omitted, the method and the system are capable of effectively reducing interaction time delay during the establishment of TFO and the signaling load of TFO and timely realizing the improvement of speech quality.
Description
Technical field
The present invention relates to a kind of encode/decode-free operation implementation method and system, relate in particular to a kind of implementation method and system of the encode/decode-free operation when adopting adaptive multi-rate modes, belong to the voice communication technical field.
Background technology
In second generation mobile communications network (GSM), the communicating pair of speech business need adopt certain voice coding modes usually, transfers signals to the opposite end by wireless network, core net.As shown in Figure 1, be existing gsm communication system structural representation, mainly comprise travelling carriage, base transceiver station (basetransceiver station, be called for short: BTS), base station controller (Base Station Controller, be called for short: BSC) and mobile switching centre (Mobile Switching Center is called for short: MSC).
In the wireless network, the signal that transmits between BTS and the BSC adopts time division multiplexing, and (be called for short: TD0M) frame, one road speech take time division multiplexing (Time Division Multiplex, the abbreviation: TDM) code stream of 16kbps; G.711 transmission is adopted the pulse code modulation of standard (Pulse CodeModulation, be called for short: PCM) coded system, one road speech is taken the 64kps pcm stream between the core network element MSC.Therefore, between core network elements such as BSC and MSC or MGW, need to add transcoder (be called for short: TC), to finish of the conversion of 16kbpsTDM code stream to the 64kps pcm stream.
Based on said system, in once conversing, voice signal will pass through twice encoding-decoding process of making a start with receiving end respectively, can cause the loss of voice quality like this.If do not carry out this twice encoding-decoding process, and directly the TDM code stream is placed on transparent transmission in the pcm stream, be about to the low level information that the 16kps code stream takies the 64kbps code stream, then can remove two coding-decoding operations from, improve voice quality, but prerequisite is the voice coding modes unanimity of communicating pair, can be discerned by opposite equip. after just making the TDM code stream be transparent to the opposite end.This process that reaches encode/decode-free operation by transparent transmission mechanism is called: (Tandem Freeoperation is called for short: TFO) encode/decode-free operation.
For fixing speech coding pattern, as full rate (FR) pattern, half rate (HR) pattern etc., after two ends are determined to use same coding mode, promptly can be by opening the TFO operation.But for variable speech coding pattern, as adaptive multi-rate (Adaptive Multi-Rate, be called for short: AMR) pattern after the communication two ends confirm all to adopt the AMR pattern, also needs further to consult the specific coding mode that is adopted in the code set; After reaching an agreement, open the TFO operation again, carry out the transparent transmission of TDM frame.Otherwise receiving terminal can't be discerned the TDM frame that transparent transmission is come.In the prior art, come the concrete coded system in negotiation communication two ends by increasing TFO the encoding list negotiation signaling.As shown in Figure 2, set up signaling process figure for existing based on the session of TFO negotiation mechanism.Wherein mainly comprise following process:
1, initialization procedure.Calling terminal TC and called end TC send the presynchronization signal mutually, as the TFO_FILL signal, prepare to begin the TFO operation to notify the other side.
2, TFO negotiations process.Two ends TC sends negotiation request message to the opposite end respectively, and as TFO_REQ message, wherein carry and hold current coded system separately, be x as the coded system of calling terminal TC; The coded system of called end TC is y.After two ends TC receives above-mentioned request message respectively, reply the negotiation response message to the opposite end, as TFO_ACK message.Wherein carry and hold current coded system separately.Two ends TC judges according to the coded system of the opposite end that receives whether the coded system at two ends mates.When judging when not matching, begin following TFO code set reciprocal process.
3, TFO code set reciprocal process.Two ends TC sends mutual request message to the opposite end respectively, as TFO_REQ_L message.Wherein carry the code set that end is separately supported.For example, the code set of calling terminal TC is x, y and z; The code set of called end TC is y, z.After two ends TC receives above-mentioned mutual request message respectively, reply alternate acknowledge message to the opposite end, as TFO_ACK_L message.Wherein carry the code set that end is separately supported.Code set reciprocal process by TFO, BSC can be known the common factor of the coded system that the communication two ends are supported, for example, occuring simultaneously is y, and in common factor, choose in the coded system with both sides request than the immediate coded system of low rate, force unified two ends to use this coded system.
4, TFO sets up process.The employed coded system in communication two ends is transmitted message by after reunification by code stream, and as TFO_TRANS message, transparent transmission TDM code stream in pcm stream is to realize the TFO operation.
The defective of prior art is: above-mentioned TFO code set reciprocal process has increased interaction time delay, has increased the weight of the signaling traffic load of TFO operation.In practice, when not adopting the AMR pattern, TFO successfully once only need to consult the 440ms time delay, and after the employing AMR pattern, it mainly is owing to TFO code set reciprocal process produces that TFO successfully once need at least to consult 1080ms time delay, the time delay of the 640ms of increase.
In addition, in communication process, the inconsistent situation of coded system that the switching owing to coded system causes can appear.Because the influence of interaction time delay may make TFO can't in time follow the tracks of the switch speed of AMR coded system, thereby influence is difficult to guarantee the timely adjustment and the improvement of voice quality to the timely tracking of communication environment.Thereby influence speech quality.
Summary of the invention
The problem to be solved in the present invention is: when adopting the AMR pattern, reduce in the TFO operation owing to the interaction time delay that adopts code set reciprocal process to produce.
In order to address the above problem, one embodiment of the present of invention have provided a kind of encode/decode-free operation implementation method, comprising:
After calling terminal transcoder and called end transcoder receive the negotiation request message that comes from the opposite end respectively, according to the coded system of the opposite end transcoder that carries in this negotiation request message, judge that the coded system at two ends all belongs to adaptive multi-rate modes and whether identical;
When the coded system of judging two ends all belongs to adaptive multi-rate modes and when inequality, the coded system that local terminal adopted is switched to the less coded system of code rate in the coded system that calling terminal and called end adopt;
Calling terminal transcoder and called end transcoder carry out the transparent transmission of encode/decode-free operation frame mutually based on the same-code mode after switching.
In order to address the above problem, an alternative embodiment of the invention has provided a kind of encode/decode-free operation and has realized system, comprising: transcoder and base station controller;
Described transcoder comprises:
First module is used to receive the negotiation request message that comes from the opposite end;
Unit second is used for the coded system of the opposite end transcoder that carries according to the negotiation request message that first module receives, judges whether the coded system at two ends all belongs to adaptive multi-rate modes and whether identical with the local terminal coded system;
Unit the 3rd is used for the judged result according to Unit second, when the coded system at two ends all belongs to adaptive multi-rate modes and when inequality, sends a notification message to base station controller;
Unit the 4th, the coded system after being used for switching based on base station controller is carried out the transparent transmission of encode/decode-free operation frame mutually with the opposite end.
Described base station controller is used for according to coming from the notification message of Unit the 3rd, the coded system that local terminal adopted is switched to the less coded system of code rate in the coded system of calling terminal and called end.
By the present invention, owing to omitted TFO code set of the prior art negotiations process, the interaction time delay in the time of therefore can effectively reducing TFO and set up has reduced the signaling traffic load of TFO; And because the reducing of interaction time delay, thereby can in time realize the improvement of speech quality, and when channel circumstance changes, can effectively realize the quick tracking of TFO the switching of the coded system under the AMR pattern.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is existing gsm communication system structural representation;
Fig. 2 sets up signaling process figure for existing based on the session of TFO code set interaction mechanism;
Fig. 3 is the flow chart of the embodiment of the invention 1 described TFO implementation method;
Fig. 4 is the signaling diagram of the embodiment of the invention 1 described TFO implementation method;
Fig. 5 is the structural representation of the embodiment of the invention 2 described TC.
Embodiment
Present embodiment provides a kind of TFO implementation method, as shown in Figure 3, comprising:
Wherein, calling terminal TC is the pairing TC of calling party's terminal that initiation session is set up request; Called end TC is meant the pairing TC of callee's terminal that sets up session with calling party's terminal.
For example, the coded system of supposing calling terminal TC is x; The coded system of called end TC is y.Then the calling terminal TC coded system of carrying in the negotiation request message that called end TC sends is x; The coded system that called end TC carries in the negotiation request message that calling terminal TC sends is y.
If do not satisfy above-mentioned condition, then finish this step, subsequent step can be set up process for stopping this session; Perhaps, hold consultation again according to the execution in step 102 of returning shown in Figure 3.Because under the AMR of prior art pattern, the coded system that adopt at the communication two ends might change, and after changing, re-executes the described deterministic process of this step again, then might satisfy above-mentioned condition, and then execution in step 110.In addition, also can handle, repeat no more herein according to other modes of the prior art.
Wherein, coded system comprises calling terminal TC or information such as coded system that called end TC adopted and code rate.For example, in last example, coming from the coded system that the coded system of carrying in the called end TC negotiation request message shows that current called end TC is adopted is y, and calling terminal TC searches respective coding mode y according to this coded system in the local coder set; Correspondingly, coming from the coded system that the coded system of carrying in the calling terminal TC negotiation request message shows that current calling terminal TC is adopted is x, and called end TC searches respective coding mode x according to this coded system in the local coder set.Wherein, the local coder set is meant the code set in the equipment of end separately that is kept at calling terminal TC and called end TC in advance, for example, is kept at the code set among calling terminal BSC and the called end BSC.
If do not find the respective coding mode, then finish this step, subsequent step can be set up process for stopping this session; Perhaps, hold consultation again according to the execution in step 102 of returning shown in Figure 3.Because under the AMR of prior art pattern, the coded system that adopt at the communication two ends might change, and after changing, re-executes the described deterministic process of this step again, then might find the respective coding mode, and then execution in step 120.In addition, also can handle, repeat no more herein according to other modes of the prior art.
Be not less than the local terminal code rate if judge the opposite end code rate, then finish this step, subsequent step can be for not carrying out any operation; Perhaps, hold consultation again according to the execution in step 102 of returning shown in Figure 3.Because under the AMR of prior art pattern, the coded system that adopt at the communication two ends might change, and after changing, re-executes the described deterministic process of this step again, then might satisfy above-mentioned condition, and then execution in step 130.In addition, also can handle, repeat no more herein according to other modes of the prior art.
For example, in last example, the code rate of coded system y of judging the opposite end as calling terminal TC is during less than the code rate of the coded system x of local terminal, and x switches to y with coded system; Correspondingly, the code rate of coded system x of judging the opposite end as called end TC is not then switched during greater than the code rate of the coded system x of local terminal.
Particularly, can be according to prior art, when coded system by after reunification, transmit message by code stream and set up TFO and connect, begin the speech transparent transmission then.
By the described method of present embodiment, as seen from Figure 4, owing to omitted TFO code set of the prior art negotiations process, the interaction time delay in the time of therefore can effectively reducing TFO and set up has reduced the signaling traffic load of TFO; And because the reducing of interaction time delay, thereby can in time realize the improvement of speech quality, and when channel circumstance changes, can effectively realize the quick tracking of TFO the switching of the coded system under the AMR pattern.
Present embodiment provides a kind of encode/decode-free operation to realize system, as shown in Figure 5, comprises TC1 and base station controller 2.Wherein TC1 comprises: first module 10, second unit 20, the 3rd unit 30 and the 4th unit 40.TC1 and base station controller 2 mode as shown in Figure 1 are connected in the gsm communication system.In the present embodiment, the TC that is connected in calling terminal is called calling terminal TC; The TC that is connected in called end is called called end TC.The concrete TFO implementation method based on native system is as follows:
After calling terminal TC and called end TC finish initialization, send the negotiation request message that carries the local terminal coded system mutually.
For example, littler if second module 32 among the calling terminal TC1 is judged the code rate of callee TC1, then base station controller 2 switches to the coded system of calling terminal TC1 the coded system of called end TC1; If it is bigger that second module 32 among the called end TC1 is judged the code rate of calling party TC1, then base station controller 2 does not carry out the switching of coded system.
After finishing the switching of coded system, the coded system after the 4th unit 40 among calling terminal or the called end TC1 switches based on base station controller 2 is carried out the transparent transmission of encode/decode-free operation frame mutually with the opposite end.Thereby realize the TFO operation.
By the described device of present embodiment, owing to omitted TFO code set of the prior art negotiations process, the interaction time delay in the time of therefore can effectively reducing TFO and set up has reduced the signaling traffic load of TFO; And because the reducing of interaction time delay, thereby can in time realize the improvement of speech quality, and when channel circumstance changes, can effectively realize the quick tracking of TFO the switching of the coded system under the AMR pattern.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1, a kind of encode/decode-free operation implementation method is characterized in that comprising:
After calling terminal transcoder and called end transcoder receive the negotiation request message that comes from the opposite end respectively, according to the coded system of the opposite end transcoder that carries in this negotiation request message, judge that the coded system at two ends all belongs to adaptive multi-rate modes and whether identical;
When the coded system of judging two ends all belongs to adaptive multi-rate modes and when inequality, the coded system that local terminal adopted is switched to the less coded system of code rate in the coded system that calling terminal and called end adopt;
Calling terminal transcoder and called end transcoder carry out the transparent transmission of encode/decode-free operation frame mutually based on the same-code mode after switching.
2, encode/decode-free operation implementation method according to claim 1 is characterized in that the step that described calling terminal transcoder and called end transcoder switch described coded system specifically comprises:
In the local coder set, search the coded system of opposite end;
The code rate of the coded system of the opposite end that finds and the code rate of local terminal are compared;
When the code rate of local terminal during, the coded system that local terminal adopted is switched to the coded system of opposite end less than the code rate of opposite end.
3, encode/decode-free operation implementation method according to claim 2 is characterized in that the described step that the local terminal coded system is switched to the opposite end coded system specifically comprises:
When the code rate of judging the opposite end more hour, the base station controller to the local terminal place sends a notification message;
Described base station controller switches to the coded system that adopt the opposite end with the coded system that local terminal adopted.
4, encode/decode-free operation implementation method according to claim 2 is characterized in that described searching with opposite end respective coding mode also comprises in the local coder set:
If search failure, then when receiving negotiation request message, continue to judge according to this negotiation request message whether the coded system that adopts the opposite end belongs to adaptive multi-rate modes and whether identical.
5, encode/decode-free operation implementation method according to claim 2 is characterized in that the code rate of the current coded system that adopts in described judgement opposite end also comprises:
When the code rate of judging local terminal more hour, then when receiving negotiation request message, continue to judge whether the coded system that adopts the opposite end belongs to adaptive multi-rate modes and whether identical.
6, encode/decode-free operation implementation method according to claim 1 is characterized in that described calling terminal transcoder and called end transcoder also comprise before receiving described negotiation request message respectively:
Send the negotiation request message that carries the current coded system that adopts of local terminal to the opposite end respectively.
7, encode/decode-free operation implementation method according to claim 6 is characterized in that sending described negotiation request message and also comprises before:
Described calling terminal transcoder sends the presynchronization signal to described called end transcoder;
Described called end transcoder is replied the presynchronization signal to described calling terminal transcoder, is used to carry out encode/decode-free operation and initially turns into.
8, encode/decode-free operation implementation method according to claim 1 is characterized in that belonging to adaptive multi-rate modes and when inequality when the coded system of judging two ends, describedly specifically comprises to the step of opposite end transparent transmission encode/decode-free operation frame respectively:
Based on the different coded system in two ends, transparent transmission time division multiplexing code stream in impulse coding modulation code stream.
9, a kind of encode/decode-free operation is realized system, it is characterized in that comprising: transcoder and base station controller;
Described transcoder comprises:
First module is used to receive the negotiation request message that comes from the opposite end;
Unit second is used for the coded system of the opposite end transcoder that carries according to the negotiation request message that first module receives, judges whether the coded system at two ends all belongs to adaptive multi-rate modes and whether identical with the local terminal coded system;
Unit the 3rd is used for the judged result according to Unit second, when the coded system at two ends all belongs to adaptive multi-rate modes and when inequality, sends a notification message to base station controller;
Unit the 4th, the coded system after being used for switching based on base station controller is carried out the transparent transmission of encode/decode-free operation frame mutually with the opposite end.
Described base station controller is used for according to coming from the notification message of Unit the 3rd, the coded system that local terminal adopted is switched to the less coded system of code rate in the coded system of calling terminal and called end.
10, transcoder according to claim 9 is characterized in that described Unit the 3rd comprises:
First module is used for the coded system of the opposite end transcoder that carries according to the negotiation request message that first module receives, searches and opposite end respective coding mode in the local coder set;
Whether second module, the code rate that is used for judging the opposite end according to the coded system that first module searches arrives be less than the code rate of local terminal;
Three module is used for the judged result according to second module, when the code rate of opposite end more hour, send a notification message to described base station controller.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010142235A1 (en) * | 2009-06-10 | 2010-12-16 | 华为技术有限公司 | Method, control apparatus and system for local exchange |
| CN103871415A (en) * | 2012-12-14 | 2014-06-18 | 中国电信股份有限公司 | Method for realizing inter-system voice communication, system and TFO conversion device |
| CN103888977B (en) * | 2009-06-10 | 2017-12-01 | 华为技术有限公司 | A kind of method of local exchange, control device and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001403B (en) * | 2006-01-10 | 2010-11-24 | Ut斯达康通讯有限公司 | Expansing codeless conversion operation in system of personal mobile phone |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010142235A1 (en) * | 2009-06-10 | 2010-12-16 | 华为技术有限公司 | Method, control apparatus and system for local exchange |
| CN101925043B (en) * | 2009-06-10 | 2014-02-26 | 华为技术有限公司 | Local exchange method, control device and system |
| CN103888977B (en) * | 2009-06-10 | 2017-12-01 | 华为技术有限公司 | A kind of method of local exchange, control device and system |
| CN103871415A (en) * | 2012-12-14 | 2014-06-18 | 中国电信股份有限公司 | Method for realizing inter-system voice communication, system and TFO conversion device |
| CN103871415B (en) * | 2012-12-14 | 2017-08-25 | 中国电信股份有限公司 | Realize the method, system and TFO conversion equipments of different systems voice intercommunication |
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