CN100411450C - Realization method and system for improving voice quality in wireless communication network - Google Patents
Realization method and system for improving voice quality in wireless communication network Download PDFInfo
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- CN100411450C CN100411450C CNB2006100030977A CN200610003097A CN100411450C CN 100411450 C CN100411450 C CN 100411450C CN B2006100030977 A CNB2006100030977 A CN B2006100030977A CN 200610003097 A CN200610003097 A CN 200610003097A CN 100411450 C CN100411450 C CN 100411450C
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Abstract
The present invention relates to a method and a system for improving the voice quality of a wireless communication network. The method mainly comprises the steps that a network side informs a user terminal device about determined error frame information non-1/8 speed rate frames caused by prior transmission; the user terminal device smoothly processes the received information according to the notification of the network side to obtain voice information smoothly processed. The user terminal is informed about the identified error frames in a down direction in a reliable mode, so the user terminal can effectively identify error frame information in the process of transmission so that the received information frames are smoothly processed conveniently on the user terminal so as to obtain the voice information smoothly processed with high quality. Therefore, under the condition of the same wireless environment, the present invention can ensure that the voice quality after a TFO (TrFO) function is started is better than the voice quality after the TFO (TrFO) function is closed; thus, the voice quality in the wireless communication network is effectively enhanced.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of technology that is used for improving the speech business quality of wireless system.
Background technology
In mobile communications network, for the interface-free resources in the saving system, just adopted lower speech encoding rate at speech business, this just makes speech encoding rate among the mobile network well below fixed network, therefore, cause the voice quality among the mobile network to be lower than fixed network.
The factor that influences voice quality mainly comprises: voice coding modes, encoding and decoding speech number of times, time delay or delay variation, voice activation level, Packet Error Ratio or packet loss, terminal or the like.
In CDMA2000 (CDMA 2000) system, three kinds of voice coding modes of main employing, specifically comprise: 8K QCELP (speed is the Qualcomm Code Excited Linear Prediction (QCELP) of 8K), 8K EVRC (Enhanced Variable Rate Coder) and 13K QCELP (speed is the Qualcomm Code Excited Linear Prediction (QCELP) of 13K) coded system, wherein, the most frequently used voice coding modes is 8K EVRC.
In WCDMA (Wideband Code Division Multiple Access (WCDMA)) system, the voice coding modes of employing then is AMR (adaptive multi-rate) coded system, and reference speed rate is 12.2Kbps.
In speech encoding and decoding process, encoding and decoding speech of every work, voice quality loss about 10%, therefore, the encoding and decoding speech conversion times that adopts in carrying out the speech business process is few more good more.Based on this characteristic in the system,, reduce the number of times of encoding and decoding speech for guaranteeing voice quality, just in mobile network system, developed TFO (Tandem Free Operation, exempt from secondary coding) and TrFO (Transcoder Free Operation, encoderless operation) technology, wherein:
Described TFO is meant: when mobile phone terminal calling handset terminal, if the business option that calling and called equipment uses is identical, promptly the voice encoding and decoding mode of caller mobile phone and called mobile phone is identical, does not then carry out the series connection of codec unit at equipment side;
Described TrFO is meant: when mobile phone terminal calling handset terminal, need not the participation of encoding and decoding speech unit; Be that TrFO is in CDMA (code division multiple access) network, it is the technology that after Access Network, core net all realize IPization, just can support, be a new stage of cdma network development, therefore, in carrying out the speech business process, need not the participation of encoding and decoding speech unit.
With the TFO technology is example, the respective coding handling process as shown in Figure 1, TFO among the figure and TC (encoding and decoding speech) are arranged side by side, when passage is set up beginning, local terminal TFO processing module is earlier set up TFO by TFO message mutual with the TFO processing module of opposite end and is connected, when TC decodes, the TFO processing module makes the speech frame that compresses the TFO frame simultaneously and puts into through on low two BIT (bit) in PCM (pulse code modulation) data code flow of TC decoding, this operation is little to the PCM data influence, the TFO frame can be sent to the other side simultaneously; At the other side's TFO processing module place, if from pcm stream, successfully extract the TFO frame, then the coding of TC is just no longer handled, but directly from the TFO frame, extract the compressed voice supplemental characteristic, send to MS (travelling carriage), if because data are damaged and can't extract the TFO frame from pcm stream, then TC proceeds coding, thereby the speech parameter data that obtains compressing is sent to MS, makes and can realize seamless switching between TFO and the TC.
At above-mentioned TFO technology, but find in the test process of reality: under the situation of up increase error code, the voice quality of opening TFO is poorer than the voice quality of closing TFO, causes voice quality to reverse, and promptly can't obtain the lifting of voice quality by TFO.
Specifically as shown in Figure 2, when opening the TFO function, if at up introducing error code, BTS1 (base station system) sends wrong frame for FMR1 (the radio frames processing module on the base station controller), FMR1 receives that wrong frame then sends complete 1 1/8 rate frame or do not send out frame to EVC (the encoding and decoding speech module of equipment side), if EVC does not receive frame or receives complete 1 1/8 rate frame, then can send complete 1 1/8 rate frame to opposite end FMR2, opposite end FMR directly mails to mobile phone by BTS2 after receiving complete 1 1/8 rate frame, therefore, mobile phone is received is complete 1 1/8 rate frame.Simultaneously, for the situation at descending introducing error code, being that then mobile phone is received misses frame.
According to the EVRC agreement, when mobile phone is received complete 1 1/8 rate frame for the first time, should think wrong frame and carry out smoothing processing, to guarantee voice quality; When receiving 1/8 rate frame of two frames continuously, mobile phone just is used as quiet frame and is handled, and can not carry out level and smooth.And when mobile phone is received the mistake frame of descending introducing, can all carry out smoothing processing to improve voice quality to each frame.
In communication process, it all is single discontinuous approximately having 95% complete 1 1/8 rate frame, and promptly mobile phone often need carry out smoothing processing to the frame that receives in communication process.
Yet, in practical application and test analysis process, reason owing to the chip for cell phone design, in mobile phone, 1/8 rate frame of first frame complete 1 received is not carried out smoothing processing according to agreement, thereby cause after opening the TFO function, behind up introducing error code, voice quality is had a strong impact on generation, specifically as shown in table 1:
Table 1
| Error code is introduced in up-downgoing | Voice quality mark (TFO opens) | Voice quality mark (TFO closes) |
| Up FER (frame error rate) is 0%, and descending FER is 0% | 3.471 | 3.308 |
| Up FER is 0%, and descending FER is 5% | 3.251 | 3.162 |
| Up FER is 5%, and descending FER is 0% | 2.541 | 2.97 |
| Up FER is 5%, and descending FER is 5% | 2.477 | 2.878 |
As can be seen from Table 1, owing in mobile phone, received frame is not carried out smoothing processing according to complete 1 1/8 rate frame that receives, generation comparatively seriously influences to voice quality after causing up introducing error code, at this moment, descending introducing error code is not had obvious influence, i.e. the introducing of descending error code is also not obvious to the influence of the deterioration of voice quality.
Therefore, in the prior art, although open TFO (TrFO) function is important measures that improve the CDMA voice quality, but, cause opening TFO (TrFO) function and make the voice quality of user terminal reception reduce greatly on the contrary owing to the received frame of up introducing error code is not carried out smoothing processing as the mobile phone of user terminal.At present, this problem is still perplexing each telecom operators and telecom equipment manufacturers.
From above-mentioned analysis also as can be seen, so long as the frame of the mistake of introducing before FMR2 confirmed as comprises the erroneous frame of eating dishes without rice or wine to transmit introducing and wire transmission introducing, all can produce similar voice quality and worsen consequence.
Summary of the invention
The purpose of this invention is to provide a kind of implementation method and system that improves voice quality in the cordless communication network, thereby can be so that portable terminal can effectively identify the mistake frame information in the transmission course, so that the information frame that receives is carried out smoothing processing, effectively improve the quality of speech business mutual in the network.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of implementation method that improves voice quality in the cordless communication network, comprising:
A, the mistake frame information of having determined that will be caused by transmission course before at network side adopt the non-1/8 rate frame informing user terminal equipment of setting;
B, subscriber terminal equipment carry out smoothing processing according to the notice of network side to the information that receives, the voice messaging after the acquisition smoothing processing.
Described steps A comprises:
The equipment of A1, network side receives the frames of voice information that need send to subscriber terminal equipment;
The frame that A2, parsing receive when determining erroneous frame to occur according to analysis result, and adopts non-1/8 rate frame of setting to notify the subscriber terminal equipment of this voice messaging of reception.
Described steps A comprises:
A3, network equipment receive the mistake frame that send the base station, then construct complete 1 1/8 rate frame and send, perhaps transmit frame not;
After the network equipment at the subscriber terminal equipment place of A4, receiving speech information receives complete 1 1/8 rate frame or empty frame, determine to occur the mistake frame, and adopt the non-1/8 rate frame informing user terminal of setting.
Described steps A also comprises:
The mistake frame information that network equipment directly or indirectly will be determined adopts the non-1/8 rate frame informing user terminal equipment of setting.
Described network equipment can be base station, base station controller, radio network controller or mobile switching centre.
In described steps A, network equipment is by sending full signaling frame or being exclusively used in the frame of error notification to subscriber terminal equipment, perhaps misses the notice of frame by transmit frame mode not.
The present invention also provides a kind of system that improves voice quality in the cordless communication network, comprising:
Be arranged at the mistake frame notification unit in the network equipment: the subscriber terminal equipment that is used for when the mistake frame appears in the frames of voice information that receives, notifying receiving speech information by non-1/8 rate frame;
Be arranged at the mistake frame processing unit in the subscriber terminal equipment: be used for the frames of voice information that receives being carried out smoothing processing, and obtain the voice messaging after the smoothing processing according to the notice of mistake frame notification unit.
Described mistake frame notification unit comprises:
The erroneous frame judge module: the frame that is used for sending to according to the needs that receive subscriber terminal equipment determines whether to occur the mistake frame, and triggers error notification frame constructing module when the mistake frame occurring;
Error notification frame constructing module: be used for when the mistake frame occurring, carrying out structure, and give error notification frame sending module with the error notification frame of structure as non-1/8 rate frame of error notification frame;
Error notification frame sending module: described error notification frame is sent to subscriber terminal equipment;
Perhaps, described mistake frame notification unit comprises:
The erroneous frame judge module: the frame that is used for sending to according to the needs that receive subscriber terminal equipment determines whether to occur the mistake frame, and triggers empty frame processing module when the mistake frame occurring;
Empty frame processing module: be used for the mistake frame not occurring to the mode informing user terminal equipment of subscriber terminal equipment transmit frame by control.
Described mistake frame processing unit specifically comprises:
The erroneous frame identification module: the notice of the appearance mistake frame that reception mistake frame notification unit is sent, and trigger the smoothing processing module;
Smoothing processing module: the frames of voice information that receives is carried out smoothing processing, and obtain the voice messaging after the smoothing processing.
Described network equipment can be base station, base station controller, radio network controller or mobile switching centre.
As seen from the above technical solution provided by the invention, among the present invention because the mistake frame that will identify at down direction (being the mode of non-1/8 rate frame) informing user terminal in new ways, thereby make user terminal can effectively identify the mistake frame information in the transmission course, so that on user terminal, the information frame that receives is carried out smoothing processing, obtain the voice messaging of having after the smoothing processing than good quality.
And, the mechanism that the present invention has also clearly proposed the identification of mistake frame and sent, thus guarantee in network, can to determine accurately the mistake frame that occurs in the transmission course, with informing user terminal.
Therefore, realization of the present invention can guarantee under the identical situation of wireless environment, voice quality will be better than the voice quality of closing TFO (TrFO) function after opening TFO (TrFO) function, thereby solve the voice quality problem that makes each telecom operators and telecom equipment manufacturers all thorny in the prior art up hill and dale.
Description of drawings
Fig. 1 is the processing procedure schematic diagram of TFO of the prior art;
Fig. 2 is a voice transfer process schematic diagram in the prior art;
Fig. 3 is a voice transfer processing procedure schematic diagram provided by the invention;
Fig. 4 is the specific implementation structural representation of system provided by the invention.
Embodiment
The present invention be directed at present under the relatively poor relatively situation of wireless environment, open the present situation that TFO (TrFO) makes that on the contrary voice quality descends, a kind of method has been proposed, make under the identical situation of wireless environment, voice quality when opening TFO (TrFO) back voice quality ratio and closing TFO (TrFO) is better, thereby solves the problem that prior art exists up hill and dale.Therefore, realization of the present invention makes TFO (TrFO) function can realize in cordless communication network as important measures of the voice quality that improves cordless communication networks such as CDMA.
Among the present invention, equipment side is received that up mistake frame identifies, and when descending transmission, for the frame that is designated the mistake frame, use non-1/8 rate frame informing user terminal, for example, use full signaling frame to replace this frame in the transmission of eating dishes without rice or wine, perhaps adopting other can make user terminal (is mobile telephone equipment, perhaps be called mobile phone) think that herein the mode that lacks frame or wrong frame handles (as sending empty frame or special-purpose error notification frame etc.), lack frame or wrong frame thereby make user terminal know,, guarantee that user terminal can receive correct voice messaging to adopt corresponding processing means.
Therefore, the voice quality when the method for the invention can increase substantially the conversation of mobile telephone equipment and mobile telephone equipment simply and effectively need not mobile radio terminal is upgraded.
The present invention is applicable to the wireless communication system that adopts TFO, TrFO technology, simultaneously, also is same being suitable for for wireless communication systems such as CDMA2000 and WCDMA.
For the present invention there being further understanding, specific implementation of the present invention is elaborated below in conjunction with accompanying drawing.As shown in Figure 3, concrete processing procedure provided by the invention can comprise:
Step 31: mobile phone terminal sends speech frame to BTS1, in the process of transmitting of speech frame, is eating dishes without rice or wine to introduce up error code;
Step 32:BTS1 carries out demodulation after receiving the speech frame of eating dishes without rice or wine, and will wherein separate and think that wrong frame packs after the frame that do not come out and the demodulation, then, sends to FMR1 by Abis interface (interface between BSC and the BTS);
After step 33:FMR1 received the speech frame of Abis mouth, the mistake frame that will receive from BTS1 or being judged as wrong frame all packs and help 1 1/8 rate frame and send to EVC or do not send out frame and give EVC was not then done this processing for the normal speech frame that receives;
Step 34:EVC1 decodes to speech frame by TC after receiving the speech frame that FMR1 sends (1/8 rate frame that comprises normal speech frame and complete 1), and speech frame is varied to pcm stream, sends to MSC;
If opened TFO, then EVC1 makes the TFO frame with the speech frame that compresses and puts into hanging down on two BIT in the PCM data code flow of process TC decoding when decoding by TC, simultaneously the TFO frame is sent to the other side;
These data of step 35:MSC (mobile switching centre) transparent transmission are given the EVC2 of purpose BSC;
Need to prove: for the TrFO technology, this transparent transmission process also can be introduced error code or delay variation, cause when FMR2 judges being the mistake frame, in subsequent processes, handle as the mistake frame information of having determined that causes by transmission course before in the lump for the mistake frame that occurs;
Step 36:EVC2 judges the speech frame of receiving, and handles accordingly:
(1) if the TFO function is opened, and EVC2 successfully extracts the TFO frame from pcm stream, and then the coding of TC is just no longer handled, but direct extraction compressed voice supplemental characteristic from the TFO frame sends to BTS2;
(2) if the TFO function close, or TFO opens but EVC2 can't extract the TFO frame from pcm stream, then the handling process of EVC can be same as the prior art, promptly TC proceeds coding, thereby the speech parameter data that obtains compressing, and send it to MS;
(3), then empty frame conversion is helped 1 1/8 rate frame, and it is sent to FMR2 with other frame if EVC receives the sky frame.
After step 37:FMR2 receives the speech frame that EVC sends here, convert all 1/8 rate frame of complete 1 to order (order) full rate signaling frame, and described full signaling frame sent to BTS2 together as error notification frame and other frame, described other frame comprises: full rate, 1/2 speed, 1/4 rate frame and non-complete 1 1/8 rate frame etc.;
Need to prove: in this step, can also adopt other error notification frames in the transmission processing of eating dishes without rice or wine to carry out frame, lack frame or wrong frame (the mistake frame promptly occurring) herein so that user terminal can identify, and then adopt corresponding the processing to solve the problem that prior art exists; For example, can also notify by other error notification frames that is specifically designed to error notification and occur the mistake frame in the MS system, corresponding special-purpose error notification frame need be different from other frames that transmit in the network, receives to guarantee MS that can to identify it behind the described frame be the error notification frame; In addition, can also adopt not the mode of transmit frame to replace the error notification frame to realize error notification, at this moment, MS can find to lack frame according to the situation of the frame of receiving, then determines to occur the mistake frame.
After step 38:BTS2 receives the speech frame and order frame that FMR2 sends, continue corresponding frame is sent to user terminal MS2;
After step 39:MS2 receives described speech frame and order frame, judge, if judge it is order frame or the bad frame of introducing by downlink space interface (being that downlink space interface is introduced error code), just carry out corresponding smoothing processing, if other frame is not then done smoothing processing;
As can be seen, because in step 37, respective handling to network side is improved, and makes that user terminal can effectively identify corresponding error frame (comprise and lack frame or mistake frame) in this step, obtains high-quality voice messaging so that the voice messaging that receives is carried out smoothing processing.
Therefore, realization of the present invention makes can discern the mistake frame of introducing in the voice messaging of reception as the mobile phone of user terminal, thereby can improve the quality of speech business by the mode of the frame that receives being carried out smoothing processing, obtains preferable voice service.
The present invention also provides a kind of system that is used to improve the speech business quality, and the specific implementation of this system mainly comprises following each composition module that is arranged at respectively in network equipment and the subscriber terminal equipment as shown in Figure 4, is specially:
(1) is arranged at mistake frame notification unit in the network equipment
This unit is used for the subscriber terminal equipment of notice receiving speech information when the mistake frame appears in the frames of voice information that receives;
Described mistake frame notification unit specifically comprises:
The erroneous frame judge module; The frame that is used for sending to according to the needs that receive subscriber terminal equipment determines whether to occur the mistake frame, and triggers error notification frame constructing module when the mistake frame occurring;
Error notification frame constructing module: be used for when the mistake frame occurring, carrying out structure,, and give error notification frame sending module with the error notification frame of structure as full rate signaling frame or special-purpose error notification frame as non-1/8 rate frame of error notification frame;
Error notification frame sending module: described error notification frame is sent to subscriber terminal equipment;
Perhaps, described mistake frame notification unit can also comprise with lower module:
The erroneous frame judge module; The frame that is used for sending to according to the needs that receive subscriber terminal equipment determines whether to occur the mistake frame, and triggers empty frame processing module when the mistake frame occurring;
Empty frame processing module: be used for the mistake frame not occurring to the mode informing user terminal equipment of subscriber terminal equipment transmit frame by control.
(2) be arranged at mistake frame processing unit in the subscriber terminal equipment
This unit is used for according to the notice of mistake frame notification unit the frames of voice information that receives being carried out smoothing processing, and obtains the voice messaging after the smoothing processing;
Described mistake frame processing unit specifically comprises:
The erroneous frame identification module: the notice of the appearance mistake frame that reception mistake frame notification unit is sent, and trigger the smoothing processing module;
Smoothing processing module: the frames of voice information that receives is carried out smoothing processing, and obtain the voice messaging after the smoothing processing.
In the system provided by the invention, described network equipment can be base station, base station controller/wireless network control or mobile switching centre.
In sum, can guarantee under the identical situation of wireless environment by realization of the present invention, the voice quality of opening after TFO (TrFO) function is better than the voice quality of closing TFO (TrFO) function, make TFO (TrFO) technology can in cordless communication network, realize, allow all very thorny voice quality problem of each telecom operators and telecom equipment manufacturers at present thereby solve up hill and dale as the important measures that improve voice quality.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. an implementation method that improves voice quality in the cordless communication network is characterized in that, comprising:
A, the mistake frame information of having determined that will be caused by transmission course before at network side adopt the non-1/8 rate frame informing user terminal equipment of setting; Described non-1/8 rate frame is used for informing user terminal equipment, sends at needs to have the frame that is designated the mistake frame in the frames of voice information of subscriber terminal equipment;
B, subscriber terminal equipment carry out smoothing processing according to the notice of network side to the information that receives, the voice messaging after the acquisition smoothing processing.
2. method according to claim 1 is characterized in that, described steps A comprises:
The equipment of A1, network side receives the frames of voice information that need send to subscriber terminal equipment;
The frame that A2, parsing receive when determining erroneous frame to occur according to analysis result, and adopts non-1/8 rate frame of setting to notify the subscriber terminal equipment of this voice messaging of reception.
3. method according to claim 1 is characterized in that, described steps A comprises:
A3, network equipment receive the mistake frame that send the base station, then construct complete 1 1/8 rate frame and send, perhaps transmit frame not;
After the network equipment at the subscriber terminal equipment place of A4, receiving speech information receives complete 1 1/8 rate frame or empty frame, determine to occur the mistake frame, and adopt the non-1/8 rate frame informing user terminal of setting.
4. method according to claim 1 is characterized in that, described steps A also comprises:
The mistake frame information that network equipment directly or indirectly will be determined adopts the non-1/8 rate frame informing user terminal equipment of setting.
5. method according to claim 1 is characterized in that, described network equipment is: base station, base station controller, radio network controller or mobile switching centre.
6. according to each described method of claim 1 to 5, it is characterized in that, in described steps A, network equipment is by sending full signaling frame or being exclusively used in the frame of error notification to subscriber terminal equipment, perhaps misses the notice of frame by transmit frame mode not.
7. a system that improves voice quality in the cordless communication network is characterized in that, comprising:
Be arranged at the mistake frame notification unit in the network equipment: the subscriber terminal equipment that is used for when the mistake frame appears in the frames of voice information that receives, notifying receiving speech information by non-1/8 rate frame; Described non-1/8 rate frame is used for informing user terminal equipment, sends at needs to have the frame that is designated the mistake frame in the frames of voice information of subscriber terminal equipment;
Be arranged at the mistake frame processing unit in the subscriber terminal equipment: be used for the frames of voice information that receives being carried out smoothing processing, and obtain the voice messaging after the smoothing processing according to the notice of mistake frame notification unit.
8. system according to claim 7 is characterized in that:
Described mistake frame notification unit comprises:
The erroneous frame judge module: the frame that is used for sending to according to the needs that receive subscriber terminal equipment determines whether to occur the mistake frame, and triggers error notification frame constructing module when the mistake frame occurring;
Error notification frame constructing module: be used for when the mistake frame occurring, carrying out structure, and give error notification frame sending module with the error notification frame of structure as non-1/8 rate frame of error notification frame;
Error notification frame sending module: described error notification frame is sent to subscriber terminal equipment;
Perhaps, described mistake frame notification unit comprises:
The erroneous frame judge module: the frame that is used for sending to according to the needs that receive subscriber terminal equipment determines whether to occur the mistake frame, and triggers empty frame processing module when the mistake frame occurring;
Empty frame processing module: be used for the mistake frame not occurring to the mode informing user terminal equipment of subscriber terminal equipment transmit frame by control.
9. system according to claim 7 is characterized in that, described mistake frame processing unit specifically comprises:
The erroneous frame identification module: the notice of the appearance mistake frame that reception mistake frame notification unit is sent, and trigger the smoothing processing module;
Smoothing processing module: the frames of voice information that receives is carried out smoothing processing, and obtain the voice messaging after the smoothing processing.
10. according to claim 7,8 or 9 described systems, it is characterized in that described network equipment is: base station, base station controller, radio network controller or mobile switching centre.
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| CN101351028B (en) * | 2007-07-19 | 2011-10-26 | 中兴通讯股份有限公司 | Method and apparatus for down discontinuousness voice transmission base on IP Abis interface |
| CN101350964B (en) * | 2007-07-20 | 2012-10-03 | 中兴通讯股份有限公司 | Voice transmission equipment and method for Abis interface up discontinuousness transmission |
| CN101355738B (en) * | 2007-07-25 | 2011-07-13 | 中兴通讯股份有限公司 | Voice transmission equipment and method of Abis interface discontinuousness transmission mode |
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| GB2306861A (en) * | 1995-11-03 | 1997-05-07 | Motorola Ltd | Handling erroneous data frames on a multi-hop communication link |
| CN1416656A (en) * | 2000-03-06 | 2003-05-07 | 西门子公司 | Method and device for transmitting vioce data in mobile radio network |
| US20030152152A1 (en) * | 2002-02-14 | 2003-08-14 | Dunne Bruce E. | Audio enhancement communication techniques |
| CN1615603A (en) * | 2000-11-21 | 2005-05-11 | 皇家菲利浦电子有限公司 | A communication system having bad frame indicator means for resynchronization purposes |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2306861A (en) * | 1995-11-03 | 1997-05-07 | Motorola Ltd | Handling erroneous data frames on a multi-hop communication link |
| CN1416656A (en) * | 2000-03-06 | 2003-05-07 | 西门子公司 | Method and device for transmitting vioce data in mobile radio network |
| CN1615603A (en) * | 2000-11-21 | 2005-05-11 | 皇家菲利浦电子有限公司 | A communication system having bad frame indicator means for resynchronization purposes |
| US20030152152A1 (en) * | 2002-02-14 | 2003-08-14 | Dunne Bruce E. | Audio enhancement communication techniques |
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