AU737673B2

AU737673B2 - Receive electric field level adjusting method of radio terminal device

Info

Publication number: AU737673B2
Application number: AU63502/98A
Authority: AU
Inventors: Katsuhiro Otsuka
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 1997-04-21
Filing date: 1998-04-21
Publication date: 2001-08-30
Anticipated expiration: 2018-04-21
Also published as: GB2324663B; AU6350298A; GB2324663A; GB9808472D0; JPH10294696A

Description

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S F Ref: 417621

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: NEC Corporation 7-1, Shiba Minato-ku Tokyo

JAPAN

Katsuhiro Otsuka Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Receive Electric Field Level Adjusting Method of Radio Terminal Device The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 -1- RECEIVE ELECTRIC FIELD LEVEL ADJUSTING METHOD OF RADIO TERMINAL

DEVICE

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BACKGROUND OF THE INVENTION The present invention relates to an adjusting method of a receive electric field level of a radio terminal device.

More to particularly this invention relates to an adjusting method of its correction.

Description of the Prior Art A conventional radio terminal device is provided with a controller and a memory, as disclosed in Japanese Patent Laid-Open Publication No. 63-77275. In such a radio terminal 0. device, first, the dispersion in RSSI (received signal strength identification) of a radio section and the -correction of an analog-digital converter are adjusted in assembling the device, and then the adjustment of a threshold value for discriminating between a radio k. communicable area and a radio uncommunicable area is once conducted. Thereafter, a threshold value level signal is input to the device to measure its value, and its software within a memory is changed to complete the adjustment of the threshold value.

o0 In this conventional adjusting method of the radio terminal device, it is difficult to adjust this device after the assemble, and a problem in its maintenance arises when the device is used.

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Accordingly, a need exists to provide an adjusting method of a receive electric field level of a radio terminal device, in view of the aforementioned problem of the prior art, which is capable of carrying out adjustment of correction data of an A/D converter and dispersion of a radio section after assembling the device.

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SUMMARY

In one aspect to be described below by way of example in illustration of the invention, an adjusting method of a receive electric field level of a radio terminal device, includes an A/D converter and a radio section, comprising the steps of measuring correction data (a value of a reference voltage corrected by the A/D converter when the reference voltage is converted thereby) of the A/D converter and dispersion of receive electric field level of the radio section in the radio terminal device, calculating a threshold value for discriminating between a radio communicable area and a radio uncommunicable area outside of the radio terminal device on the basis of the correction data of the A/D 1o converter and the data of the dispersion of the receive electric field level, and storing the calculation result in the radio terminal device. A personal computer sends a command for measuring the correction data and a command for measuring the receive electric field level to the radio terminal device when the radio terminal device measures the correction o° data and the dispersion of the receive electric field level, collects measuring data and calculates the threshold value.

0 According to an embodiment of the present invention, the adjustment of the dispersion of RSSI of the radio section and the correction of the A/D converter can be S. carried out from the outside of the radio terminal device and the radio terminal device 2 controls only the result of the adjustment. Hence, adjustment after device assembly can be readily carried out, and in the event that the radio section includes no signal adjusting means of the receive electric field level, the adjustment can be implemented.

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000000 0 0 [R:\LIBQ]958.doc:edg BRIEF DESCRIPTION OF THE DRAWINGS The objects, features and advantages of the present invention will become more apparent from the consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which: io0 Fig. 1 is a block diagram of a measuring system for adjusting dispersion of a radio section of a radio terminal device for use in an adjusting method of a receive electric field level of a radio terminal device according to the present invention; S."0 Fig. 2 is a sequential representation showing data flow between a personal computer and a radio terminal device S in the adjusting method of the present invention; .Fig. 3 is a flow chart showing an operation of an adjusting method of a receive electric field level of a radio .0 terminal device according to the present invention; and Fig. 4 is a graphical representation showing an approximation curve of an electric field level in the adjusting method of the present invention.

o DETAILED DESCRIPTION OF THE PREFERRED

EMBODIMENTS

Referring now to the drawings, there is shown in Fig.

1 a measuring system for adjusting dispersion of a radio section of a radio terminal device for use in an adjusting method of a receive electric field level of a radio terminal device according to the present invention.

'The next page is page 6 In Fig. 1, a personal computer 1 is connected to a radio terminal device 4 by a serial line. The radio terminal device 4 includes a power circuit 5 connected to a power source 2, a radio section 6 coupled with a signal generator 3, an analog-digital converter 7 for converting analog values such as an RSSI value and a reference voltage into their digital values, a memory 8, a serial port 9 and a controller 10. The power source 2 supplies an electric power voltage to the power circuit 5. The signal generator 3 outputs a receive level signal to the radio section 6.

Fig. 2 shows data flow between a personal computer and a radio terminal device in the adjusting method of the present invention. Fig. 3 is a flow chart showing an operation of an adjusting method of a receive electric field level of a radio terminal device according to the present invention. Fig. 4 shows an approximation curve of an electric field level.

In Fig. 2, when the personal computer sends a command for measuring correction data of the A/D converter 7 to the radio terminal device 4 in step 11, the radio terminal device 4 starts measuring the correction data of the A/D converter S"7.

An operation of the correction data measuring in the radio terminal device 4 will be described with reference to Fig. 3.

First, the controller 10 receives the command for measuring the correction data of the A/D converter 7 from the personal computer 1 via the serial port 9 in step 21. The controller 10 stops the operation of the radio terminal device 4 in step 22, to supply the reference voltage to the 7 A/D converter 7 from the power circuit 5 in step 23. After received the reference voltage, the A/D converter 7 converts the reference voltage into digital data to output this digital data to the controller 10 in step 24. The controller 10 temporarily stores the received data into the memory in step 25. If there are unmeasured data, for example, the minimum reference voltage in step 26, steps 23 to 25 are executed again. When there is no unmeasured data in step 26, the controller 10 reads the measured converted correction data out of the memory 8 and outputs this data to the personal computer 1 via the serial port 9 in step 27.

The personal computer 1 stores the measured converted 000o correction data in a memory within the personal computer 1.

S S The personal computer 1 then sends a command for measuring the dispersion of a receive electric field level of the radio section 6 to the radio terminal device 4. The radio terminal (0,0 device 4 then measures the dispersion data of the radio section 6 and sends the measured data to the personal 0000 computer 1, as follows.

The radio terminal device 4 starts measuring in step 28 in Fig. 3 and the controller 10 inputs a command for adjusting the dispersion of the receive electric field level from the personal computer 1 via the serial port 9. The controller 10 makes the radio section 6 operative in order to read the RSSI of the radio section 6 in step 29. The radio section 6 receives a signal representing the maximum value of the receive electric field level from the signal generator 3 and sends its RSSI value to the A/D converter 7 in step The A/D converter 7 converts the RSSI value into digital data and sends the converted data to the controller 10 in step 31.

8 The controller 10 temporarily stores the received data into the memory 8 in step 32. When there are any uncollected data such as the minimum value of the receive electric field level in step 33, the controller 10 carries out steps 30 to 32 repeatedly. There is no uncollected data in step 33, the controller 10 reads the collected dispersion data of the receive electric field level out of the memory 8, and sends the data to the personal computer 1 via the serial port 9 in step 34.

The personal computer 1 calculates a threshold value for discriminating between a radio communicable area and a 0e radio uncommunicable area on the basis of the converted (0 corrected data of the A/D converter 7 and the dispersion data of the receive electric field level, and outputs the calculated threshold value data to the radio terminal device a 4 in step 15 in Fig. 2.

0. When calculating the threshold value for discriminating between the radio communicable area and the 6000 radio uncommunicable area, the personal computer 1 uses the following formula.

A. .y a*x b (1) Formula shows an electric field level approximation line, as shown in Fig. 4, taking the receive electric field level in the y-axis direction and the reference voltage converted by the A/D converter 7 in the x-axis direction. In formula a represents the slope of the electric field level approximation line and b represents the intercept against the y-axis.

The personal computer 1 substitutes the value V2 obtained by converting the maximum reference voltage in the A/D converter 7 and the maximum value RSSImax of the receive electric field level for x and y in formula to obtain the following formula.

RSSImax a*V2 b (2) The personal computer 1 also substitutes the value Vl obtained by converting the minimum reference voltage in the A/D converter 7 and the minimum value RSSImin of the receive electric field level for x and y in formula to obtain the following formula.

RSSImin a*V1 b. (3) The personal computer 1 then eliminates the intercept

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b using the formulas and to obtain the slope a of the electric field level approximation line as follows.

a (RSSImax RSSImin) (V2 Vl) (4) The personal computer 1 substitutes the slope a of formula for the slope a in formula to obtain the S* intercept b as follows.

b RSSImin a*V1 The personal computer 1 substitutes the obtained slope a of the electric field level approximation line, the intercept b against the y-axis, and the value of the electric field level y for discriminating between the radio communicable area and the radio uncommunicable area for those in formula to obtain the value x. That is, the threshold value Vn for discriminating between the radio communicable area and the radio uncommunicable area is calculated as follows.

Vn (RSSI area discrimination level b)/a (6) The personal computer 1 sends the obtained threshold value Vn using formula to the radio terminal device 4 via the serial port 9.

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In the radio terminal device 4, the controller receives the threshold value Vn from the personal computer 1 via the serial port 9 in step 35 in Fig. 3. The controller 10 then stores the threshold value Vn into the memory 8 in step 36 to complete the adjustment operation.

As described above, in an adjusting method of a receive electric field level of a radio terminal device according to the present invention, the following advantages can be obtained.

A correction of RSSI dispersion of the radio e- section, a correction value measuring of the A/D converter 9 can be carried out from the outside of the radio terminal 9o°° device, and only a threshold value for discriminating between a radio communicable area and a radio uncommunicable area can be controlled in the radio terminal device. As a result, the adjustment after the device assemble can be readily performed.

9999 In case that the radio section includes no signal adjusting means of the receive electric field level, the S adjustment can be carried out.

While the present invention has been described in its preferred embodiments with reference to the accompanying drawings, it will be appreciated that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. An adjusting method of a receive electric field level of a radio terminal device including an analog-digital converter and a radio section, comprising the steps of: measuring correction data of the analog-digital converter and dispersion of receive electric field level of the radio section in the radio terminal device; calculating a threshold value for discriminating between a radio communicable area and a radio uncommunicable area outside of the radio terminal device on the basis of the correction data of the analog-digital converter and the data of the dispersion of the lo receive electric field level; and storing the calculation result in the radio terminal device; wherein a personal computer sends a command for measuring the correction data and a command for measuring the receive electric field level to the radio terminal device S•when the radio terminal device measures the correction data and the dispersion of the 15 receive electric field level, collects measuring data and calculates the threshold value. o 0@S@

2. An adjusting method of a receive electric field level of a radio terminal device 0 substantially as herein described with reference to Figs. 1 to 4 of the accompanying drawing.

3. A measuring system for adjusting dispersion of a radio section of a radio terminal device substantially as herein described with reference to Figs. 1 to 4 of the 0o00o accompanying drawings. 00 S 25

4. A measuring method of a correction data of a radio terminal substantially as herein described with reference to Figs. 1 to 4 of the accompanying drawings.

5. A measuring method of a dispersion of a receive electric field of the radio section for a radio terminal device substantially as herein described with reference to Figs. 1 to 4 of the accompanying drawings. DATED this tenth Day of July, 2001 NEC Corporation Patent Attorneys for the Applicant SPRUSON FERGUSON [R:\LIBQ]958.doc:edg