CN1270549C - Method for realizing interconnection of mobile communication network - Google Patents
Method for realizing interconnection of mobile communication network Download PDFInfo
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- CN1270549C CN1270549C CN 03137317 CN03137317A CN1270549C CN 1270549 C CN1270549 C CN 1270549C CN 03137317 CN03137317 CN 03137317 CN 03137317 A CN03137317 A CN 03137317A CN 1270549 C CN1270549 C CN 1270549C
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Abstract
The present invention relates to a method for realizing TFO intercommunication between a GSM system and a UMTS system by intercommunication TC, which comprises: judging whether a GSM mobile phone and GSM system equipment use GSM-EFR voice encoding/decoding operation for a current call or not; judging whether a UMTS mobile phone and a UMTS system can use voice coding/decoding operation at the velocity of AMR12.2k or not; judging whether the GSM system and the UMTS system both support TFO operation. If the three conditions are all satisfied, received information frames are judged by intercommunication TC, corresponding different kinds of treatment is carried out according to the information frames of different types, and then, the information frames after being converted are transmitted. If one of the three conditions is not satisfied, a coding/decoding cascade method is used. The technical scheme of the present invention can reduce delay time and voice damage at the time of GSM-UMTS intercommunication, and system realization cost is reduced.
Description
Technical field
The present invention relates to a kind of mobile communications network interworking technology, is a kind of method that realizes intercommunication between global system for mobile communications (GSM) system and Universal Mobile Telecommunications System (UMTS) specifically.
Background technology
In order to save radio spectrum resources, the mobile phone of present gsm system and UMTS system all uses codec, and (Transcoder, TC) the pulse code modulation (pcm) voice signal with sample quantization changes coded voice signal into.The coded voice signal that the transmit leg mobile phone sends is reduced into the PCM signal of 64Kbps by the TC decoding on Access Network or equipment of the core network, when the PCM signal is delivered to recipient's Access Network or equipment of the core network, being encoded once more by TC becomes coded voice signal, be sent to recipient's mobile phone, the TC of recipient's mobile phone is reduced into the PCM signal with the coded voice signal decoding.This mode through twice encoding and decoding speech operation, is called as the audio coder ﹠ decoder (codec) cascade system on whole communication path.Most of now gsm systems and core net are based on time division multiplexing (Time Division Multiplexing, TDM) UMTS version 99 (the UMTS Release 99 of networking, UMTS R99) and UMTS edition 4 (UMTS Release 4, UMTS R4) in the system, generally all adopts this mode.
When gsm system and the intercommunication of UMTS system, adopt the mode of codec cascade usually, voice signal transmits between GSM and UMTS system by the G.711 PCM signal of 64Kbps.This just need be at the TC resource that connects the more costliness of configuration on people's net or the equipment of the core network, cost height; Through twice encoding and decoding speech, time delay is big in the communication path; In the communication path through twice encoding and decoding speech, the speech intelligibility damaged.
In standard agreement, gsm system and UMTS system all support codec to exempt from cascade system (TFO) pattern, use between two mobile phones of TFO pattern in the communication path only through an encoding and decoding speech: between Access Network or equipment of the core network, still transmit the coded voice signal that the transmit leg mobile phone sends, TC on Access Network or the equipment of the core network carries out the TFO operation, the transparent transmission coded voice signal, the TC of last recipient's mobile phone is reduced into the PCM signal with the coded voice signal decoding.
The TFO pattern of this UMTS and GSM intercommunication requires the TC of GSM and UMTS system all to use the AMR encoding and decoding speech.Because it is later that AMR encoding and decoding speech standard occurs, actual gsm system does not all adopt the AMR encoding and decoding speech, and uses GSM full-speed voice encoding and decoding (GSM-FR encoding and decoding), GSM half-rate speech encoding and decoding (GSM-HR encoding and decoding) and GSM enhanced full rate speech encoding and decoding (GSM-EFR encoding and decoding).Use the AMR encoding and decoding speech and will allow existing gsm system all transform, cost is quite big and in fact infeasible.
Summary of the invention
The purpose of this invention is to provide by an intercommunication TC, realize TFO method of operating between GSM and the UMTS system, to overcome defective of the prior art.
A kind of realization mobile network of the present invention intercommunication comprises the steps:
(1) intercommunication TC carries out following judgement:
Judge that this calls out GSM mobile handset and whether GSM system equipment uses the GSM-EFR encoding and decoding speech; Judge whether UMTS mobile phone and UMTS system can use the encoding and decoding of AMR 12.2k rate speech; Judge whether gsm system and UMTS system all support the TFO operation;
If above any one condition does not meet, then use the encoding and decoding cascade system; If all satisfy, then enter step (2);
(2) intercommunication TC judges the frame signal that sends, if control class frame signal then enters step (3), if the speech frame signal enters step (4), if quiet frame signal then enters step (5);
(3) intercommunication TC peels off out with the TFO control information, is converted into voice recipient's TFO control class frame, sends;
(4) intercommunication TC extracts the voice signal in the speech frame, is packaged into voice recipient's TFO speech frame, sends;
(5) the intercommunication TC TFO speech frame form mute signal being changed into voice recipient experience signal and be packaged into the voice recipient sends.
The function of described intercommunication TC can be realized by the TC that is arranged in the gsm system, or by the TC realization that is arranged on the UMTS system, also can independently realize on the interwork unit.
Because the 12.2.K speed of the AMR encoding and decoding speech that GSM-EFR encoding and decoding that gsm system uses and UMTS system use is compatible substantially, promptly the AMR codec can be separated the GSM-EFR vocoder frames, and vice versa.Except the definition of discontinuous transmission pattern (DTX) and comfort noise coding (SID frame) slightly different.The SID frame of GSM-EFR is 244 bit sizes, and every 480ms sends a SID frame that upgraded during quiet; And the SID frame of AMR is 35 bits, and every 160ms sends a SID frame that upgraded during quiet.Based on this characteristic, can realize the TFO intercommunication between gsm system and the UMTS system.
Time-delay and speech damage when the present invention can reduce GSM-UMTS intercommunication communication.And, because of intercommunication TC does not use codec functions, save cost than conventional codec cascade system.
Description of drawings
Fig. 1 is the flow chart of the method for realization mobile communications network of the present invention intercommunication.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The method that realizes mobile communications network intercommunication of the present invention is referring to Fig. 1.
(1) intercommunication TC carries out to judge:
(a) judge that this calls out GSM mobile handset and whether GSM system equipment uses the GSM-EFR encoding and decoding speech;
(b) judge whether UMTS mobile phone and UMTS system can use the encoding and decoding of AMR 12.2k rate speech;
(c) judge whether gsm system and UMTS system all support the TFO operation.
If above any one condition does not meet, then use the encoding and decoding cascade system; Otherwise enter step (2).
(2) intercommunication TC judges the frame signal that sends, if control class frame signal then enters step (3), if the speech frame signal then enters step (4), if quiet frame signal then enters step (5).
(3) the TFO control information is peeled off out, be converted into voice recipient's TFO control class frame, send.
(4) voice signal in the speech frame is extracted, be packaged into voice recipient's TFO speech frame, send.
(5) the TFO speech frame form of mute signal being changed into voice recipient experience signal and being packaged into the voice recipient sends.
Be that voice transmit leg, UMTS mobile phone are example for the voice recipient below with the GSM mobile handset, set forth specific embodiments of the present invention:
1. intercommunication TC judges that this calls out GSM mobile handset and whether GSM system equipment uses the GSM-EFR encoding and decoding speech; Judge whether UMTS mobile phone and UMTS system can use the encoding and decoding of AMR12.2k rate speech; Judge whether gsm system and UMTS system all support the TFO operation.If any one condition does not meet, then use the encoding and decoding cascade system; Otherwise continuation the following step;
2. intercommunication TC identification gsm system is sent GSM TFO control class frame signal, comprise that TFO presynchronization frame signal, TFO consult frame signal and acknowledgement frame signal, the adaptive solution frame signal of encoding and decoding and acknowledgement frame signal thereof, TFO and set up frame signal and acknowledgement frame signal thereof, TFO abort frame signal, the TFO control information is peeled off out, and be translated into UMTS TFO control class frame signal, issue the UMTS mobile phone.
GSM mobile handset be in speak during, intercommunication TC receives gsm system when sending the TFO speech frame that comprises the GSM-EFR voice signal, and wherein GSM-EFR voice signal is extracted, and is packaged into AMR TFO speech frame, sends.
GSM mobile handset be in quiet during, intercommunication TC changes into the AMR mute signal with the mute signal of GSM-EFR and is packaged into AMR TFO speech frame form according to the rule of AMR encoding and decoding speech and sends.
Be that voice transmit leg, GSM mobile handset are that the voice recipient is an example with the UMTS mobile phone again, set forth an alternative embodiment of the invention:
1. intercommunication TC judges that this calls out GSM mobile handset and whether GSM system equipment uses the GSM-EFR encoding and decoding speech; Judge whether UMTS mobile phone and UMTS system can use the encoding and decoding of AMR 12.2k rate speech; Judge whether gsm system and UMTS system all support the TFO operation.If any one condition does not meet, then use the encoding and decoding cascade system; Otherwise enter step (2);
2. intercommunication TC identification UMTS system sends UMTS TFO control class frame signal, comprise that TFO presynchronization frame signal, TFO consult frame signal and acknowledgement frame signal, the adaptive solution frame signal of encoding and decoding and acknowledgement frame signal thereof, TFO and set up frame signal and acknowledgement frame signal thereof, TFO abort frame signal, the TFO control information is peeled off out, and be translated into GSM TFO control class frame signal, issue GSM mobile handset.
The UMTS mobile phone be in speak during, intercommunication TC receives the UMTS system when sending the TFO speech frame that comprises AMR 12.2k voice signal, and wherein AMR voice signal is extracted, and is packaged into GSM TFO speech frame, sends.
When the UMTS mobile phone be in quiet during, intercommunication TC changes into the GSM-EFR mute signal with the mute signal of AMR 12.2k and is packaged into GSM TFO speech frame form according to the rule of GSM-EFR encoding and decoding speech and sends.
Claims (2)
1. a method that realizes the mobile communications network intercommunication is characterized in that comprising the steps:
(1) intercommunication TC carries out following judgement:
Judge that this calls out GSM mobile handset and whether GSM system equipment uses the GSM-EFR encoding and decoding speech;
Judge whether UMTS mobile phone and UMTS system can use the encoding and decoding of AMR 12.2k rate speech;
Judge whether gsm system and UMTS system all support the TFO operation;
If above any one condition does not meet, then use the encoding and decoding cascade system; If all satisfy, then enter step (2);
(2) intercommunication TC judges the frame signal that sends, if control class frame signal then enters step (3), if the speech frame signal then enters step (4), if quiet frame signal then enters step (5);
(3) intercommunication TC peels off out with the TFO control information, is converted into voice recipient's TFO control class frame, sends;
(4) intercommunication TC extracts the voice signal in the speech frame, is packaged into voice recipient's TFO speech frame, sends;
(5) the intercommunication TC TFO speech frame form mute signal being changed into voice recipient experience signal and be packaged into the voice recipient sends.
2. method according to claim 1 is characterized in that: described intercommunication TC can be arranged on the TC in the gsm system, or is arranged on the TC in the UMTS system, also can be an independently interwork unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03137317 CN1270549C (en) | 2003-06-08 | 2003-06-08 | Method for realizing interconnection of mobile communication network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 03137317 CN1270549C (en) | 2003-06-08 | 2003-06-08 | Method for realizing interconnection of mobile communication network |
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| CN1553723A CN1553723A (en) | 2004-12-08 |
| CN1270549C true CN1270549C (en) | 2006-08-16 |
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| CN 03137317 Expired - Fee Related CN1270549C (en) | 2003-06-08 | 2003-06-08 | Method for realizing interconnection of mobile communication network |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004075582A1 (en) | 2003-02-21 | 2004-09-02 | Nortel Networks Limited | Data communication apparatus and method for establishing a codec-bypass connection |
| CN100401811C (en) * | 2005-11-15 | 2008-07-09 | 华为技术有限公司 | Method for implement secondary coding-decoding operation service at cross-packet network and media gateway |
| CN100484304C (en) * | 2006-03-29 | 2009-04-29 | 华为技术有限公司 | Method and media network gateway for implementing conversation in packet-packet model |
| CN1983845B (en) * | 2006-04-16 | 2010-05-12 | 华为技术有限公司 | Method for adjusting up-link rate |
| US8346239B2 (en) | 2006-12-28 | 2013-01-01 | Genband Us Llc | Methods, systems, and computer program products for silence insertion descriptor (SID) conversion |
| CN101304591B (en) * | 2008-06-06 | 2013-06-05 | 中兴通讯股份有限公司 | Down synchronous monitoring method without secondary encoding/decoding operation |
| WO2010009660A1 (en) * | 2008-07-25 | 2010-01-28 | 华为技术有限公司 | Method and apparatus for converting data frames |
| CN101662752B (en) * | 2009-09-14 | 2012-11-28 | 中兴通讯股份有限公司 | Mute frame conversion method and device thereof |
| CN101657046A (en) * | 2009-09-14 | 2010-02-24 | 中兴通讯股份有限公司 | Data transmitting method of userplane based on Iur-g interface and device |
| CN102195744A (en) * | 2010-03-12 | 2011-09-21 | 中兴通讯股份有限公司 | Exception handling method for tandem free operations and transcoder |
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