Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
1999-06-01
2004-01-20
Vu, Huy D. (Department: 2665)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S232000, C370S254000, C455S456500, C455S522000, C375S224000
Reexamination Certificate
active
06680914
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to cellular communication systems, and more particularly to a method for optimizing the performance of a mobile communication system and the air field environments.
2. Description of the Related Art
FIG. 1
shows a prior art schematic diagram for optimizing the mobile communication system and the air field environments through the use of a DM (Diagnostic Monitor)
30
. The mobile station
10
is connected to communication port Com
2
of a PC (Personal Computer), and the GPS (Global Positioning System)
20
is connected to Com
1
port. The DM
30
is executed on a PC running under an MS DOS operating system
40
.
The DM
30
periodically requests predefined data from the mobile station
10
through the Com
2
port at step s
10
, and the mobile station
10
reports the measured data to the DM
30
at step s
20
. At the same time (step s
10
), the DM
30
periodically requests GPS information from the GPS
20
through the Com
1
port, and receives corresponding information from the GPS at step s
30
.
The administrator can adjust the scan size of the searcher window by using the direction keys of the PC (right key, left key, etc.) at step s
40
, and transmit the desired information to the mobile station
10
. When log masking is started, the log masked (i.e., necessary) items among the items transmitted from the mobile station
10
and the GPS
20
are collected at step
50
. Because the DM
30
operates under MS DOS
40
, a maximum of
16
Mbytes can be collected at once. The administrator can modify the screen by selecting the function keys of the PC (F
1
~F
9
) and analyze the received data at step
60
.
The call status, the channel, and basic information of the mobile station
10
are displayed on the status display at step
70
. The scanned Ec/Io, as large as the size of the search window defined for each PN (Pseudo random Noise) offset received from the mobile station
10
, is displayed on the screen of the PC as part of the search information provided by the searcher module of the mobile station at step
80
. The searcher module's function in the mobile station is to store the pilot signals collected from the neighboring BTSs and search the stored signals during a time defined by the search window interval. Here, the search window interval is a constant time interval. The search window interval is resolved in units of searcher position. For example, if a search window size is specified as 100 ms, then the unit of searcher position (i.e., resolution) might be 1 ms, and the mobile station would read and search the stored pilot signals every 1 ms in order to seek a temporal position having the strongest pilot signal. The size of the search window and resolution of the searcher position are searcher information.
Also, the finger information of the mobile station
10
is received and the Ec/Io information for each finger is displayed at step
90
. From the AGC (Automatic Gain Control) power information and the frame error information, the transmitting and receiving voice rate, receiving FER (Frame Error Rate), the transmitting and receiving power, and gain adjustment are displayed at steps
120
and
110
. From the frame information, the frame information of the paging channel, access channel, reverse traffic channel, forward traffic channel are displayed at step
100
.
The prior art is subject to the following problems and disadvantages. First, because the current general OS (Operating System) platforms run under the windows environments, when a user utilizing a windows based PC wants to use the existing MDM (Mobile Diagnostic Monitor) running on a MS DOS OS platform, he must build an extra OS window for the analytical environments, making it inconvenient for measurement and analysis. Second, because the MDM running under MS DOS OS is limited by the size of the RAM for data collection, the capacity to collect data cannot exceed 16 Mbytes. Third, because the prior art MDM runs under MS DOS and the measurement and analysis tool runs under windows, using the tool is therefore inconvenient. Fourth, the prior art is oftentimes subject to erroneous information when collecting data. Because the reliability of logged data is reduced, a function to detect the erroneous information in the data analysis tool is needed. Fifth, the Ec/Io output signals of the various PN offsets are difficult to monitor in environments having multiple signals. Sixth, though the finger information function transmits the Ec/Io of the fingers, the PN offset information of the fingers is difficult to determine. Seventh, the GPS receiving position information is limited to the trimble GPS. Eighth, in the case of checking field environments using the MDM described above, in an area of rapidly changing PN offsets, the data samples are few, and therefore analysis of the sample data is restrictive. Ninth, because the Ec/Io data update rate of the pilot channel is fast, the transition of the pilot strength cannot be instantaneously known using the diagnostic monitor
30
. And tenth, because a specific GPS receiver is used, the user also needs the trimble GPS receiver, and this increases overhead cost.
SUMMARY OF THE INVENTION
One object of the present invention is to provide a method for optimizing the performance of a code division multiple access system and the air field environments. Optimization of the air field environment may be generally defined as optimizing system variables including finger information, frame error, and AGC power.
Another object of the present invention is to provide a method for limiting the capacity of collection data only by the size of the hard disk drive and not by the size of the RAM.
In one aspect of the invention, a method for optimizing the performance of the CDMA system and the air field environments comprises: connecting the CDMA mobile station to a PC; connecting the GPS to the PC; operating the DM (Diagnostic Monitor) under a windows OS environment in said PC; requesting data from the mobile station; the mobile station measuring the requested data items and the present system state, and transmitting the measured data to the DM; requesting the data of the present position from the GPS by the DM; transmitting the data of the mobile station's present position to the DM via the GPS; analyzing the data received from the mobile station via the GPS, by the DM; and displaying the analyzed results.
The operating environment of the test method of the present invention includes the following preferences and assumptions:
1. The DM is preferably an SDM (Samsung Diagnostic Monitor) monitor.
2. The mobile station and the GPS are connected to the PC through respective communication ports of the PC.
3. The DM makes periodic requests for data from the mobile station and the GPS.
4. A manager who manages the DM can adjust the scan size of the searcher window and the output range of the Ec/Io using the direction key of the window.
5. The manager defines the information which he wants to collect, and transmits the defined information as a data request to the mobile station.
6. When the log is started, the log masked items among the items transmitted from the mobile station and the GPS are collected.
7. The display screen to display the analyzed results can be modified by the manager by selecting the corresponding tool bar through the function key or the mouse of the PC.
8. The analyzed results are displayed on the screen through a PN histogram and in accordance with voice activity. The PN histogram can display the Ec/Io histogram for each PN offset per specific time. The voice activity performs its function according to the voice rate.
9. The communication method between the mobile station and the GPS and the DM is asynchronous HDLC (High level Data Link Control) RS-232C.
10. The DM arranges and unifies the checking items when optimizing the field.
11. When the DM is in use, other tools can be concurrently used.
12. The capacity of the DM to collect data is limited only by the capacity of the hard
Cho Won-il
Jeong Jae-ho
Jung Jin-saeng
Dilworth & Barrese LLP
Phan M.
Samsung Electronics Co,. Ltd.
Vu Huy D.
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