MXPA00003195A - Speech/radio quality evaluator - Google Patents

Abstract

A system and method in a radio telecommunications network for correlating speech quality over an air interface link with a plurality of radio quality parameters. The system includes a mobile switching center (MSC) (13) for recording uplink radio quality information from the air interface link, a mobile test tool (12) for recording downlink radio quality information from the air interface link, a parser (16) for parsing the radio quality information into the plurality of radio quality parameters, and a memory (17) for storing the parsed radio quality information. A digital audio tape (DAT) recorder (19) or personal computer (PC) is electronically connected to a mobile station for recording a speech conversation from the air interface link simultaneously with the recording of the radio quality information. A DAT-link interface (21) is utilized to interface the DAT recorder with a playback unit (26) and with a synchronizer/controller (22) which synchronizes the stored radio quality information and the stored speech conversation. The radio quality parameters are presented to the operator in graphical form on a visual display (51) while the speech conversation is simultaneously presented to the operator in audio form (25). The operator enters a subjective evaluation of the speech quality of the speech conversation, and the evaluation is correlated with the radio quality parameters and displayed on the visual display.

Description

VOICE / RADIO QUALITY EVALUATOR BACKGROUND OF THE INVENTION TECHNICAL FIELD OF THE INVENTION This invention relates to a cellular telecommunication network and, more particularly, to a system and method for evaluating the voice and radio quality of a telecommunications system. DESCRIPTION OF THE RELATED ART Techniques exist in cellular telecommunication networks to collect information regarding the radio quality of the air interface link between a base station and a mobile station. Various quality parameters such as, for example, Signal Strength (SS), Bit Error Rate (VER), Frame Erase Rate (FER), Frequency Error (FRE), Time Alignment (TA), as Mobile Station Power Level (PL) have been used in attempts to identify parameters that have a direct or indirect impact on voice quality in air interface links. However, there are no systems to analyze, organize and present this data to system operators. In addition, there has not been a system for directly correlating measured radio quality parameters with subjective voice quality evaluations of a particular air interface link. Although there are no known prior art teachings of a solution to the aforementioned deficiency and limitation such as what is presented here, German patent DE 4442613A1 of Peschel and colleagues comments on a subject that has some relation to the subject matter discussed here. Peschel presents a mobile recording device that can be used to record signals at the air interface and generate values for the radio quality parameters. However, Peschel does not teach or suggest a system or method to analyze, organize, and present this data to system operators. In addition Peschel does not teach or suggest a system or method to directly correlate measured radio quality parameters with subjective voice quality evaluations of a particular air interface link. A review of the above reference does not reveal any disclosure or suggestion of a system or method as described and claimed here. To overcome the disadvantage of existing solutions, it would be beneficial to have a system and method to analyze, organize, and present system operators with radio quality data from the air interface link. Such a system as well as a method for this purpose would also allow a direct correlation of the measured radio quality parameters with subjective evaluations of the voice quality of a particular air interface link. The present invention offers a system and method of this type. SUMMARY OF THE INVENTION In one aspect, the present invention is a system for presenting to a system operator radio quality information from an air interface link between a mobile station and a base station in a radio telecommunications network. The system comprises a means for recording radio quality information from the air interface link, a means for analyzing the radio quality information on various radio quality parameters, and a means for visually displaying the various quality parameters. radio to the system operator. The system may also include means for displaying signaling events on the interface link between the mobile station and the base station that occurred as the radio quality information was recorded, and means for correlating the signaling events with signaling parameters of radio. In another aspect, the present invention is a system in a radio telecommunications network for correlating a voice quality in an air interface link with various radio quality parameters. The system includes a mobile switching center (MSC) for recording uplink radio quality information from the air interface link, a mobile station test tool for recording downlink radio quality information from the air interface link, a means for analyzing the radio quality information in the various radio quality parameters, and a means for store the radio quality information analyzed. The system also includes a recording device such as an audio recorder or a personal computer (PC) connected electronically to a mobile station to record a voice conversation coming from the interface link simultaneously with the recording of the quality information of the user. radio, a means for storing the recorded voice conversation, and a means for synchronizing the radio quality information and the stored voice conversation. The system also includes a means for presenting the radio quality parameters to the operator in graphic form in a visual display, and a means for simultaneously presenting the voice conversation to the operator in the form of audio. The system may also include a means for recording a subjective evaluation by the system operator of the voice quality of the recorded voice conversation and a means for correlating the subjective evaluation of the voice quality with the synchronized voice quality parameters. In another aspect, the present invention is a method for correlating a voice quality in an air interface link in a radio telecommunications network with a plurality of radio quality parameters. The method begins by recording radio quality information from the air interface link, and analyzing the radio quality information in the plurality of radio quality parameters. Simultaneously, a voice conversation is recorded from an air interface link. This is followed by the synchronization of the radio quality information and the speech conversation and by the simultaneous presentation of the radio quality parameters and the recorded voice conversation to a system operator for correlation. The method may also include the recording of a subjective evaluation by the system operator of the voice quality of the recorded voice conversation, and the recording of the subjective evaluation of the voice quality with the synchronized radio quality parameters. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and its numerous objects and advantages will be more apparent to those skilled in the art with reference to the following drawings, in combination with the attached specification, wherein: Figure 1 is a block diagram of a preferred embodiment of a radio / voice quality analyzer of the present invention; Figure 2 is an illustration of an exemplary interactive graphical display window through which a system operator can control the system of the present invention; Figure 3 is an illustration of an exemplary graphic display window illustrating various radio quality parameters in graphic form; and Figure 4 is a flow diagram illustrating the steps of the method of the present invention. DETAILED DESCRIPTION OF THE MODALITIES The radio / voice quality analyzer is a tool that visually presents radio quality information from an air interface link between a mobile station and a base station in a radio telecommunications network to an operator of system. The radio quality information is collected and analyzed in various radio quality parameters. The values of the parameters are plotted along a time axis and presented in a visual display. A historical record of signaling events is also created, events are correlated with times along the time axis. In addition, the quality analyzer allows a system operator to listen to a voice conversation recorded from a mobile phone call while simultaneously displaying a display of radio quality parameters synchronized with the recorded voice conversation. In this way, the operator can subjectively evaluate the voice quality of the mobile phone call and directly identify the radio quality parameters that contribute to achieving voice quality. The present invention is also useful as a pure radio quality analyzer through the graphical display of various radio quality parameters. Fig. 1 is a block diagram of the preferred embodiment of the radio / voice quality analyzer system 10 of the present invention. A quality analyzer 11 collects radio quality parameters from a Mobile Station Test System (TEMS) 12, and a mobile switching center (MSA) 13. The TEMS 12 is a mobile tool that monitors the interface link of air with its service base station, and records all the signals in the uplink and in the downlink. A programmatic in the tool allows recorded data to be downloaded to a personal computer attached for viewing and analysis. For example, TEMS offers downlink radio quality information approximately every 0.5 seconds. The downlink SEE is also provided for MSC 13, but not as frequently (every 4-5 seconds). The MSC that includes two functions also collects and reports radio quality parameters. A Cell / Traffic Event (CER) registration function 14 collects information in a single call, or some calls. A function of MDATA 15 is a tool that uses triggers injected into the cellular system in order to generate and capture certain information. Information is collected on all calls in the system through the MDAT function. The radio quality parameters collected and analyzed by the quality analyzer may include, for example: Parameter Source Range values Signal strength uplink (SSU); 0-63 MSC Signal strength uplink (SSD); 0-63 TEMS / MSC Uplink class of frequency errors in the bits (BERU); 0-7 MSC Descending link of frequency class of errors in the bits (BERD); 0-7 TEMS / MSC Uplink frequency errors (FREU); -800 to +800 Hz MSC Uplink of frame erasure speed (FERU); 0-26 MSC Descending Frame Erase Rate (FERD); 0-26 TEMS Sudden increment quality (BQ); 0-100 MSC Time Alignment; and 0-30 TEMS / MSC Mobile station (PL) power level. 0-10 MSC the system operator can choose the display of all radio quality parameters or of a selected subset of radio quality parameters. Methods for calculating the values of each individual radio quality parameter are well known to those skilled in the art of cellular telecommunications and will not be discussed here. Information regarding the mobile station control channel (CC), voice channel (VC), and time segment (TS) are sent from the TEMS 12 to a synchronizer / controller 22. An information regarding the current cell (CELL) and the device (DEV) is sent from the Service MSC 13 to the synchronizer / controller. Radio mobile station downlink quality data from TEMS 12 is combined with the CER uplink and MDATA primary uplink radio quality data from MSC 13. The data is then analyzed by a radio quality analyzer 16 and placed in a single stream recorded as radio quality information 17. This provides a radio quality record both in the uplink and in the downlink. An information of signaling events included in the data from the TEMS and the CER is placed in a historical record of signaling events 28. A voice information 18 is recorded from a recording device of this type such as a recorder digital audio tape (DAT) or a personal computer (PC) connected electronically through a digital interface with a mobile station (recorder MS / DAT 19). The mobile station is modified to provide the digital voice at the interface connection point. This reduces the loss or distortion of voice signals received by the mobile station that may arise if the record is made from the analog signal provided to the mobile station speaker. In the preferred embodiment, the MS / DAT recorder 19 is connected to the quality analyzer 11 via a DAT 21 interface interface. This allows the synchronizer / controller 22 to automatically synchronize the playback of the speech conversation 18 with the Radio quality information 17 as well as signaling event history 28. The system operator can also stop and start the MS / DAT recorder 19 through the DAT link interface. If the configuration system does not include a DAT link interface, the reproduction of the voice conversation 18, the radio quality information 17, and the signaling events are manually synchronized, a sound header is placed at the beginning of the information of voice for manual synchronization of voice conversation and radio quality information. Radio quality information and signaling events are reported together from TEMS 12 and CER 14 and are automatically synchronized temporarily. The probe header is marked in terms of time, and this time is indicated on the screen of a radio quality display 51 (FIG. 3) in such a way that display 51 can start simultaneously with the sound header. An automatic synchronization of the speech conversation is carried out essentially in the same way through the synchronizer / controller 22. The quality analyzer 11 collects information continuously on various radio quality parameters from the registered radio quality information. 17. This information is placed in graphic form by a graphics generator 23 and said information is presented in the radio quality display 51 to a system operator in a standard workstation or personal computer. The voice conversation is reproduced to the operator at an audio station 25 through a voice resolution unit 26. The voice reproduction unit obtains voice information either from a tape on the MS / DAT 19 recorder or from a memory in a DAT file 27. the system operator controls the quality analyzer 11 through an interactive graphic display window 31 (figure 2). In an exemplary embodiment, the quality analyzer compares the information of radio quality parameters with the subjective evaluation of the voice quality entered by the operator every second. At the end of the recording, the quality analyzer generates summary statistics regarding the quality of the voice, and the correlation of varis parameters with good or bad evaluations of voice quality. Figure 2 is an illustration of an exemplary interactive graphics display window 31 through which a system operator can control the system of the present invention. The window 31 emulates two controls of a playback device, provides mouse and keyboard controls through which the operator controls the playback of the recorded voice conversation and the presentation of the synchronized radio quality parameters. A first section 32 allows the operator to control the DAT link configuration parameters. A first button 33 is used to select a DAT file for playback of the recorded voice conversation. A second button 34 is used to select a DAT tape for playback. A DAT file name can be entered in frame 35. Other parameters can be entered in the marked boxes, for example, DAT playback offset (in seconds) 36 file sampling rate 37, and sampling accuracy (used for linear) 38. A second section 39 includes playback controls for synchronized playback of the DAT 27 files (Figure 1). 4 keyboard buttons (4) are provided: play, stop, reinitialize, and exit. In addition, a GOTO window allows the operator to enter a specific time value for the start of the playback. The playback controls for synchronized playback of the DAT tape are included in section 41. nine (9) key buttons are provided: play, fast forward (FF), abandon, reinitialize, stop, load, scan, print, and miscellaneous (Mise). In addition, the system operator can enter a time in a GOTO window. This causes the quality analyzer to begin playing at the designated time. A voice quality scale 42 allows the operator to indicate his subjective assessment of voice quality of the recorded voice conversation. The exemplary voice quality scale illustrated in Figure 2 employs a voice quality scale less and less than 5 (excellent) to 0 (very bad or none). A third section 43 offers the operator direct control of the reproduction of the MS / DAT recorder 19 (Figure 1) through a DAT interface 21. With the controls in section 43, the operator can play and operate the DAT tape regardless of the playback of the radio quality parameters. For example, the operator can locate a particular point on the DAT tape, before starting a synchronized playback, in order to manually synchronize the voice conversation 18 with the radio quality information 17. A fourth section 44 presents a list of the radio quality parameters available and / or selected for display on the screen of Figure 3. The operator can select all the parameters for its display or only a subset of said parameters. A fifth section 45 offers the operator a global menu of the functions performed by the DAT link 21, and a sixth section 46 offers the operator a menu of several miscellaneous functions and described in greater detail below. When the interactive display of Figure 2 is employed, the operator hears the voice conversation recorded on the air interface between the base station and the MS / DAT recorder 19 (Figure 1), and evaluates the quality of the voice. Enter your subjective evaluation simultaneously using the voice quality scale 42. The quality analyzer 11 samples the operator evaluation every second, and instantaneously places the evaluation in the graphic display window of figure 3. Figure 3 is an illustration of an exemplary graphic display window 51 that illustrates various radio quality parameters in graphic form. The radio quality parameters are displayed on a screen that presents, for example, a line graph of each parameter. The X axis is a time scale in seconds, and the Y axis represents the current values of each of the various radio quality parameters. The current cell (cell) 52, the control channel (CC) 53, the device (Dev) 54 are also displayed.; the voice channel (VC) 55, and the time segment (TS) 56 that the mobile station is currently using. The current latitude 57 and the current length 58 of the position of the mobile station can also be displayed. The current cell information 52 and the device 54 are acquired from the CER function 14 in the MSC 14. the control channel 53, voice channel 55, and time segment 56 are acquired from TEMS 12.

A vertical display list 59 of the raw data collected from TEMS 12 and MSC 13 is also displayed. The values of the radio quality parameters are used to draw the line graphs. The raw data also includes an indication of the various signaling events at the air interface that was observed as the radio quality data was recorded. These events are correlated in time with the radio quality parameters currently displayed on the screen, as well as voice conversation playback. Below is an exemplary list of events that can be identified and displayed in the vertical display list 59 along with an indication of the source from which the event indication is received. Event Source Source access (OA) CER Page response access (TO) CER Digital transfer request (DHR) CER Radio quality message (ROM) CER Attempt to transfer (HA1) CER Transfer result (HA2) CER Obtaining voice channel (VS) CER Event Source Transfer order (HA) TEMS Dedicated channel statistics (DE) TEMS Physical layer control (PHLACO) TEMS Physical layer control setting (PHLACIAC) TEMS Measurement order (MEOR) TEMS Measuring order acknowledgment (MEORAC) TEMS Transfer (HA) TEMS Paging response (STOP) TEMS Origin (OR) TEMS Release of DTC (RE-DT) TEMS Set fading states (SAFAST) TEMS Change power level (CHPOLE) TEMS Order confirmation (ORCO) TEMS DTC assignment (DTAS) TEMS Base station acknowledgment (BASTAC) TEMS Mobile station acknowledgment (MOAC) TEMS Audio stage (AUST) TEMS Inactive (ID) TEMS System parameter 1 (SYPA1 ) TEMS System Parameter 2 (SYPA2) TEM S Registration Implement (REIN) TEMS Event Source Registration ID (REÍD) TEMS Registration (RE) TEMS Registration acknowledgment (REAC) TEMS Control filler (COFI) TEMS As reference figures 1-3, the operation of the control analyzer of the present invention is described below. Selecting the load button in section 41 of figure 2 causes the loading of an ASCII file of radio quality information from memory 17 in the synchronizer / controller 22. selecting the Play button from section 41 causes that the quality analyzer begins to plot radio quality line graphs on the screen of figure 3. The line graphs are usually plotted in real time, at the same speed as the voice conversation record. If FF is selected, the Play button is activated, the screen window is updated at 10 times the normal speed. If FF is selected when the playback is in the stopped state, the screen window is updated at 500 times the normal speed. The selection of the Stop button 41 stops playback, while the reset button causes the screen to be erased and the playback position is reset to the beginning of the ASCII. A temporary value can be entered in the GOTO window to cause the screen to be written starting at the designated time. The selection of the Print button in section 41 presents a menu with 6 elements. The first element causes the content of the current screen to be printed in a postscript file. The entire recorded screen can be printed for later analysis. The second element causes the current screen as well as any screen history to be printed. The third element prints the raw data of the parameter graphs in an ASCII file. The fourth element prints summary statistics of the total radio quality ASCII file and the portion of the file that has already been reproduced. The statistics are printed in a statistical ASCII file. The selection of the fifth element prints all the previous elements. The sixth element is used to delete a postscript file internal generated during a "save memory" operation. The selection of the button Mise in section 41 presents the menu 46. The first element offers a mechanism to exclude several line graphs from the screen. The second element establishes the DAT link. The following five elements are used to generate the radio quality information file 17. The third element and the fourth element analyze the radio quality data recorded from TEMS 12 and save it in the TEMS file. The fifth and the sixth elements in the Mise menu analyze radio quality data recorded in the service MS 13 using the CER function 14, and save it in a CER file. The seventh element in the Mise menu synchronizes and combines the analyzed TEMS and CER files to form the radio quality information stream 17.

The eighth element is an information file for documentation on the quality analyzer system. The ninth element is a Help file that describes the procedures for system operations for the system operator. The tenth element is a "Pause During Scriptures" element that causes the writing of a new screen (figure 3) to begin only after being discarded on the old screen. When this item is selected, the Stop button and the Play button take on a red color. If a DAT recorder is used, and a DAT link is not configured, the operator must place the DAT recorder in a paused state at this time using the Pause button in section 43, (ie, if it is performing the manual synchronization of radio quality and voice playback). When playback continues, the Stop and Play buttons turn green, and the new screen starts from the beginning. If the Pause item is not selected during writing, the playback of the new screen continues during the scrapping of the old screen to disk. However, the radio quality graphs are not visualized until the removal is finished when the graphs are displayed again, they continue in real time instead of continuing at the beginning of the new screen (that is, there are no pauses). Eleventh element is a "screen size select" element that provides the ability to select a larger screen size for large displays. The twelfth element is a "select save memory" element that is used to discard the current screen to the disk every four screen frames (8 minutes). The screen is then reinitialized and continues for its regeneration where it is left. If the operator's workstation or personal computer is equipped with a DAT 21 interface, the playback of the radio quality parameters can be automatically synchronized with the playback of the recorded voice conversation. The preferred mode offers two options for synchronized playback. In the first option, the reproduction of the recorded voice information is carried out from a DAT tape in the MS / DAT recorder 19. In the second option, the reproduction of the recorded voice information is carried out from from file 27 located at the operator's workstation or personal computer. By default, the option is set from the file. If the first option is selected, then a DAT recorder with a remote control interface is required. The DAT recorder is automatically paused through the control program when the playback of radio quality parameters is in a paused state. If the second option is selected, then an audio and pause file is automatically played by the synchronizer / controller 22. The file can be created by a DAT recorder or by a personal computer connected digitally with the mobile station. Figure 4 is a flow diagram illustrating the steps of the method of the present invention. In step 61, the mobile station radio quality data and event signaling data are compiled using TEMS 12. the data may include radio quality information such as downlink SS, BER, FRE, and FER. At 62, the network radio quality data and signaling event data are collected using the CER 14 function and the MDATA function 15 on the service MSC 13. The radio quality data may include uplink SS, BER , FRE, and FER, downlink BER, and BQ, TA, and TL. In step 63, the mobile station and network radio quality data are combined. In step 64, the combined data is analyzed in radio quality parameters and sent in the form of a stream to a radio quality information file 17 where the information is stored in step 65. In 66 a historical record is created 28 of signaling events and associated times. Step 67 shows that the quality analyzer also collects voice information for example, with an MS / DAT 19 recorder or a personal computer digitally interconnected with the mobile station. The voice information is then stored on a DAT tape or in the form of a file in step 68. In step 71, recorded radio quality information, voice information, and signaling events are synchronized through of the synchronizer / controller 22. If the system configuration does not include a DAT 21 interface, the synchronization of the voice information with the radio and event quality information can be done by the system operator using the marked sound header over time. In step 72, line graphs of the radio quality parameters versus time are generated, and in step 73, the information on the screen 51 of FIG. 3 and through the audio station 25, respectively, are reproduced. radio quality and voice information. In step 74, the system operator enters his subjective evaluation of the voice quality of the mobile phone call, directly correlating the displayed radio quality parameters that are contributing to the quality of the voice achieved. Accordingly, it is believed that the operation and construction of the present invention will be apparent from the foregoing description. While the illustrated and described method, apparatus, and systems have been characterized as preferred, it will be readily apparent that changes and modifications can be made without departing from the spirit or scope of the invention in accordance with that defined in the appended claims.

Claims (36)

1. CLAIMS l.In a radio telecommunications network, a method for simultaneously displaying radio quality and voice quality parameters in an air interface link, said method comprises the steps of: recording a radio quality information from a air interface link; analyze the radio quality information on various radio quality parameters; recording a voice conversation from the air interface link, said voice recording step is carried out simultaneously with the recording step of radio quality information; and simultaneously display the various radio quality parameters and the recorded voice conversation to a system operator.
2. 2. The method for simultaneously displaying the radio quality and voice quality parameters in an air interface link of claim 1 wherein the step of simultaneously displaying the various radio quality parameters and the recorded speech conversation to an operator The system includes the steps of: storing the various radio quality parameters and the voice conversation; and synchronize the various radio quality parameters stored and the stored voice conversation.
3. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 1 wherein the step of simultaneously displaying the various radio quality parameters and the recorded speech conversation to a system operator includes the steps of: presenting the radio quality parameters to the operator in a visual manner; and simultaneously present the voice conversation to the operator in the form of audio.
4. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 3 wherein the step of presenting the radio quality parameters to the operator in visual form includes the steps of: generating graphs of the radio quality parameters; and present the graphs to the operator in a graphic display device.
5. The method for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 1 wherein the step of recording radio quality information from the air interface link includes recording information from Downlink radio quality with a mobile station test tool.
6. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface of claim 5 wherein the step of recording a downlink radio quality information with a mobile station test tool includes the recording of the strength of the downlink signal and the frequency of errors in the bits.
7. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 6 wherein the step of recording a downlink radio quality information with a mobile station test tool includes the Engraving of the speed of deletion of downlink frames and frequency error.
8. The method for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 1 wherein the step of recording radio quality information from the air interface link includes recording information from Uplink radio quality in a mobile service switching center (MSC).
9. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 8 wherein the step of recording an uplink radio quality information in a mobile service switching center (MSC) ) includes the recording of the uplink signal strength and frequency of errors in the bits.
10. 10. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 9 wherein the step of recording uplink radio quality information in a mobile service switching center (MSC) includes the uplink frame rate clearing and frequency error record.
11. 11. The method of simultaneous display of radio quality parameters and voice quality in an air interface link of claim 1 wherein the step of recording a radio quality information from the air interface link includes the registration of the quality of sudden increases, time alignment, and power level in a mobile service switching center (MSC).
12. 12. The method of simultaneously presenting voice quality and radio quality parameters in an air interface link of claim 1 wherein the step of recording a speech conversation from the air interface link includes the steps of: connect a recording device with a mobile station; and record the voice conversation with the recording device.
13. The method of simultaneous display of voice quality and radio quality parameters in an air interface link of claim 12 wherein the connection step of a recording device with a mobile station includes the connection of a tape recorder digital audio (DAT) with the mobile station.
14. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 12 wherein the connection step of a recording device with a mobile station includes the digital connection of a personal computer (PC) with the mobile station.
15. 15. In a radio telecommunications network, a method for simultaneously displaying radio quality and voice quality parameters in an air interface link, said method comprises the steps of: obtaining a radio quality information from a radio interface tool; mobile station test and from a mobile service switching center (MSC); analyze the radio quality information in radio quality parameters; store the radio quality parameters; simultaneously record a voice conversation associated with the radio quality information; store the voice conversation; synchronize the stored radio quality parameters and the stored voice conversation; and simultaneously display the synchronized radio quality parameters and the voice conversation to a system operator.
16. 16. The method for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 15 further comprising the steps of: recording a subjective evaluation of the voice quality of the recorded voice conversation; This evaluation is done through the system operator; and simultaneously presenting to the system operator the subjective evaluation of voice quality with the synchronized radio quality parameters and the voice conversation.
17. 17. In a radio telecommunications network, a method for simultaneously displaying radio quality parameters and voice quality in an air interface link said method comprises the steps of: recording a downlink radio quality information from the link of air interface with a mobile station test tool; recording an uplink radio quality information from the air interface link in a mobile service switching center (MSC); simultaneously recording a voice conversation from the air interface link, with an audio recorder connected to a mobile station; analyze the radio quality data in the various radio quality parameters; store the radio quality parameters; store the voice conversation; synchronize the recorded radio quality parameters and the recorded voice conversation; generate graphs of radio quality parameters; present the graphs to the operator in a graphical display; and simultaneously present the voice conversation to the operator in the form of audio. .
18. The method of simultaneous presentation of radio quality parameters and voice quality in an air interface link of claim 17 further comprising the steps of: recording a subjective evaluation of the voice quality of the recorded voice conversation, said evaluation is done by the system operator; and presenting simultaneously to the system operator the subjective evaluation of the voice quality with the radio quality parameters and synchronized voice conversation.
19. 19. A system in a radio telecommunications network for simultaneously displaying radio quality and voice quality parameters in an air interface link, said system comprising: a means for recording radio quality information from the air interface link; a means for analyzing the radio quality information in the various radio quality parameters; means for recording a voice conversation from the air interface link simultaneously with the recording of the radio quality information; and a means for simultaneously displaying the various radio quality parameters and the recorded voice conversation to a system operator.
20. 20. The system for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 19 wherein said means for recording the radio quality information from the air interface link includes: a means to record uplink information; and a means for recording downlink information. .
21. The system for simultaneous presentation of radio quality and voice quality parameters in an air interface link of claim 20 wherein said means for recording an uplink information is a mobile service switching center (MSC). .
22. The system for simultaneous presentation of radio quality and voice quality parameters in an air interface link of claim 20 wherein said means for recording downlink information is a mobile station test tool. .
23. The system for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 19 wherein said means for recording a speech conversation from the air interface link includes a personal computer (PC) connected digitally with a mobile station. .
24. The system for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 19 wherein said means for recording a voice conversation from the air interface link includes a digital audio tape recorder (DAT) connected electronically to a mobile station. .
25. The system for the simultaneous presentation of radio quality and voice quality parameters in an air interface link of claim 23 further comprising: a means for storing the radio quality information analyzed; and a means for storing the recorded voice conversation. .
26. The system for the simultaneous presentation of radio quality and voice quality parameters in an air interface link of claim 25 further comprising a means for synchronizing the stored radio quality information and the stored voice conversation before the presentation of the information to the operator. .
27. The system for simultaneously displaying the radio quality and voice quality parameters in an air interface link of claim 26 further comprising a DAT link interface for connecting the DAT recorder to the storage medium for voice conversation and with the means of synchronization.
28. The system for the simultaneous presentation of radio quality and voice quality parameters in an air interface link of claim 19 wherein said means for simultaneously displaying the plurality of radio quality parameters and the voice conversation recorded to an operator System includes: a means to present the radio quality parameters to the operator in visual form; and a means for simultaneously presenting the voice conversation to the operator in the form of audio. .
29. The system for simultaneously presenting the radio quality and voice quality parameters in an air interface link of claim 28 wherein said means for displaying the radio quality parameters to the operator in visual form includes: a graphics generator for generating graphs from stored radio quality information; and a graphic visualization to visually present the graphs to the operator. .
30. The system for simultaneously displaying the radio quality and voice quality parameters in an air interface link of claim 29 wherein said means for simultaneously displaying the voice conversation to the operator in the form of audio includes: a means for storing the conversation of recorded voice; a means to recover the stored voice conversation; an audio station to reproduce the voice conversation to the operator; and a means for synchronizing the graphic display with the audio voice conversation.
31. The system for the simultaneous presentation of radio quality and voice quality parameters in an air interface link of claim 30 further comprising: a means for recording a subjective evaluation of the voice quality of the recorded voice conversation, this evaluation is done by the system operator; and means for simultaneously presenting to the system operator the subjective evaluation of voice quality with synchronized radio quality parameters and voice conversation.
32. A system in a radio telecommunications network for the simultaneous presentation of quality parameters of radio and voice quality in a voice interface correlation link of voice quality in an air interface link, said system comprising: a switching center mobile (MSC) for recording uplink radio quality information from the air interface link; a mobile station test tool for recording downlink radio quality information from the air interface link; a means for analyzing the radio quality information in the various radio quality parameters; a means to store the information and radio quality analyzed; a recording device electronically connected to a mobile station for recording a voice conversation from the air interface link simultaneously with the recording of the radio quality information; a means for storing the recorded voice conversation; means for synchronizing the stored voice quality information and the stored voice conversation; a means to present radio quality parameters to the operator in graphic form in a visual display; and a means for simultaneously presenting the voice conversation to the operator in the form of audio.
33. A system for simultaneously displaying radio quality and voice quality parameters in an air interface link of claim 32 further comprising: a means for recording the subjective evaluation of the voice quality of the recorded voice conversation, this evaluation is done by the system operator; and means for simultaneously presenting to the system operator the subjective evaluation of voice quality with synchronized radio quality parameters and voice conversation.
34. 34. A system for presenting to a system operator radio quality information from an air interface link between a mobile station and a base station in a radio telecommunications network, said system comprising: a means for registering a radio radio quality information and signaling events that affect the radio quality from the air interface link; a means for analyzing the radio quality information in various radio quality parameters; a means to correlate radio quality parameters and signaling events that affect radio quality over time; and means for visually presenting to the system operator the plurality of radio quality parameters and signaling events correlated in time that affect the radio quality.
35. 35. The system for presenting radio quality information to a system operator of claim 34 wherein said means for visually displaying the various radio quality parameters and the signaling events correlated in time to the system operator includes: a generator of graphs that generates graphs from the various parameters of radio quality, said graphs show values of radio quality parameters in a first axis, and time in a second axis; and a graphical presentation that visually shows the graphs to the operator along with the correlated signaling events over time.
36. 36. In a radio telecommunications network, a method for presenting radio quality information to a system operator from an air interface link between a mobile station and a base station in a radio telecommunications network, said method comprises the steps of: recording radio quality information and signaling events that affect the radio quality from the air interface link; analyze the radio quality information in various radio quality parameters; correlate in time radio quality parameters and signaling events that affect radio quality; and visually presenting to the system operator the plurality of radio quality parameters and the correlated signaling events over time that affect the radio quality. . The method for presenting radio quality information to a system operator of claim 36, wherein said step of visually displaying the plurality of radio quality parameters and the signaling events correlated in time to the system operator includes the steps of : generate graphs from the radio quality parameters, these graphs show values of radio quality parameters in a first axis, and time in a second axis; and visually presenting the graphs to the operator in a graphical presentation along with the correlated signaling events over time. SUMMARY OF THE INVENTION A system and method is presented in a radio telecommunications network to correlate the voice quality in an air interface link with various radio quality parameters. The system includes a mobile switching center (MSC) (13) for recording uplink radio quality information from the air interface link, a mobile station test tool (12) for recording quality information radio downlink from the air interface link, an analyzer (16) for analyzing the radio quality information in the various radio quality parameters, and a memory (17) for storing the radio quality information analyzed . A digital audio tape recorder (DAT) (19) or a personal computer (PC) is electronically connected to a mobile station to record a voice conversation from an air interface link simultaneously with the recording of the information of radio quality. An ADAT link interface (21) is used to connect the DAT recorder to the playback unit (26) and to a synchronizer / controller (22) that synchronizes the stored radio quality information and the stored voice conversation. The radio quality parameters are presented to the operator in graphic form in a visual display (51) while the voice conversation is simultaneously presented to the operator in the form of audio (25). The operator enters a subjective voice quality assessment of the voice conversation, and the evaluation is correlated with the radio quality parameters and presented in the visual display.