JPH06132881A - Digital movable telephone system - Google Patents

Abstract

PURPOSE:To provide the digital mobile telephone system which prevents speaking from being unexpectedly disconnected or being handed off even in the area of weak radio waves. CONSTITUTION:A threshold value judge part 15 judges whether field intensity is higher than a prescribed threshold value or not, and a counter judge part 16 judges whether the number of times for the threshold value judge part 15 to judge that the field intensity is higher than the threshold value, namely, the value of a counter 14 is larger than a prescribed value or not. When the counter judge part 16 judges that the number of times for the field intensity to be higher than the threshold value is more than the fixed number of times, a control part 7 calculates the average value of field intensity higher than the threshold value and when the counter judge part 16 judges the number of times for the field intensity to be higher than the threshold value is less than the fixed number of times, the control part calculates the average value of all the field intensity and reports the calculated result to a base station as the average value of field intensity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular type digital mobile telephone such as an automobile telephone in which a mobile unit measures the electric field strength of a received radio wave a predetermined number of times in a predetermined period and reports the average value to a base station. It relates to the device.

[0002]

2. Description of the Related Art In a conventional digital mobile telephone apparatus, all of the electric field strengths measured a predetermined number of times during a predetermined period are targeted for an average value even when the received radio wave is temporarily deteriorated or short-term cutoff occurs. For example, the electric field strength is 3 every 20 msec.
The operation of measuring 6 times, dividing the sum of all of these values by 36 to obtain an average value, and reporting it to the base station
It was repeated every 20 msec.

[0003]

However, in the above-mentioned conventional configuration, even if the electric field strength becomes small several times during 36 times of measurement, the average value becomes small, and the base station side judges that the radio wave is deteriorated. Therefore, there is a problem that the call is unnecessarily cut off or handed off in an area where the radio wave is weak.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a digital mobile telephone device which does not unnecessarily disconnect a call or hand off even in an area where a radio wave is weak. .

[0005]

The present invention provides a cellular type digital mobile telephone apparatus in which a mobile unit measures the electric field strength of a received radio wave a predetermined number of times in a predetermined period and reports the average value to a base station. A threshold value judging means for judging whether or not the electric field strength is equal to or higher than a predetermined threshold value, and the number of times the electric field strength is judged to be equal to or higher than the threshold value by the threshold value judging means. When the number of times the number of times the electric field strength is equal to or more than a threshold value is determined to be a certain number of times or more by the number of times determining means that determines whether the number of times is a certain number or more of the predetermined number of times, When the number of times the electric field strength is equal to or higher than the threshold value is determined to be less than a certain number of times by the first calculation means for calculating the average value of the electric field strength equal to or higher than the threshold value, Play the average value of the electric field strength And a second calculating means for, is characterized by the calculation results of the first and second calculating means and configured to report to the base station as an average value of the electric field strength.

[0006]

The threshold value judging means judges whether or not the electric field strength is equal to or higher than a predetermined threshold value. The number-of-times determination means determines whether or not the number of times the threshold value determination means determines that the electric field strength is equal to or higher than the threshold value is equal to or higher than a predetermined number of predetermined times. The first calculation means calculates an average value of the electric field strength equal to or higher than the threshold value when the number of times the electric field strength is equal to or higher than the threshold value is judged to be equal to or higher than a predetermined value by the frequency judgment means. The second calculation means calculates the average value of all the electric field strengths when the number of times the electric field strength is equal to or more than the threshold value is judged to be less than a certain number of times by the number-of-times judgment means. Then, the calculation results of the first and second calculation means are reported to the base station as the average value of the electric field strength.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram of a mobile device of a digital mobile telephone device according to an embodiment of the present invention. The mobile device includes an antenna 1, an RF / IF unit 2 of a receiving system, a demodulator 3, and a TDMA of a receiving system. The processing unit 4, the D / A conversion unit 5, the voice processing unit 6, the control unit 7, and the PLL frequency synthesizer unit 8
, A / D conversion unit 9, and TDMA processing unit 10 of transmission system
A modulator 11, a transmission system RF / IF unit 12, memories 13a to 13c, a counter 14, a threshold value determination unit 15, a counter determination unit 16, a key unit 17, and a display unit 18. , A ringer 19, a speaker 20, and a microphone 21. In the receiving system, the RF / IF unit 2 includes an RF filter, an RF amplifier, a MIX circuit, an IF filter, an IF amplifier, etc., and extracts and amplifies a signal in a predetermined frequency band from the high frequency signal input from the antenna 1. , A reference clock is generated based on a signal from the PLL frequency synthesizer unit 8 by a control signal from the control unit 7, the reference clock and a high frequency signal are mixed, and a frequency spectrum of a frequency spectrum generated by using a non-linear portion of the transistor is generated. Extract only the differences. Demodulator 3
It includes a data demodulation circuit composed of a gate array, DSP (digital signal processor), etc.
Frequency signal from the F / IF unit 2 is shifted by π / 4, 4-phase QP
Perform SK demodulation. The TDMA processing unit 4 performs TDMA processing on the signal from the demodulator 3, performs VSELP processing on the voice signal portion, and performs processing such as decoding and error correction on the control data portion such as a message. The D / A conversion unit 5 has a T
The digital voice signal from the DMA processing unit 4 is converted into an analog voice signal. The voice processing unit 6 performs amplification processing and impedance conversion on the analog signal from the D / A conversion unit 5, and supplies the analog signal to the ringer 19 and the speaker 20. The control unit 7 stores the control data from the TDMA processing unit 4 in the memory 13a and performs processing based on the control data. On the other hand, in the transmission system, the voice emitted from the microphone 21 by the user is sent to the A / D conversion unit 9 via the voice processing unit 6, and the analog voice signal is converted into a digital signal and VSELP processing is performed. Done. The control unit 7 measures the electric field strength from the RF / IF unit 2 and uses various tables in the memory 13a to perform code conversion and error correction on data such as messages. Further, the control unit 7 controls the counter determination unit 16
When it is determined by the counter that the value of the counter 14 exceeds a certain value, the first calculating means for calculating the average value of the electric field strength stored in the memory 13b, and the counter judging unit 1
When it is determined by 6 that the value of the counter 14 is equal to or less than a certain value, the average value of all the electric field strengths of the electric field strength stored in the memory 13b and the electric field strength stored in the memory 13c is calculated. The second calculation means is configured to report the calculation results of the first and second calculation means to a base station (not shown) as an average value of the electric field strength. The TDMA processing unit 10 performs TDMA processing on the data from the control unit 7 and the audio signal from the A / D conversion unit 9. The modulator 11 is a TDM
The signal from the A processing unit 10 is π / 4 shift four-phase QPSK modulation. The RF / IF unit 12 mixes the signal from the modulator 11 with the signal corresponding to the set channel, extracts only the necessary frequency component, amplifies the power, and efficiently outputs only the output component through the antenna 1. The memory 13
Various tables and received control data are stored in a. The electric field strength equal to or higher than the threshold value is stored in the memory 13b. The electric field strength less than the threshold value is stored in the memory 13c. The counter 14 counts the number of times the electric field strength equal to or higher than the threshold value is measured. Threshold value judgment unit 15
Determines whether the electric field strength is equal to or higher than the threshold value.
The counter judgment unit 16 judges whether the value of the counter 14 exceeds a certain value. The key unit 17 controls input keys. The display unit 18 controls a display element (not shown) such as an LED or LCD.

FIG. 2 is an explanatory diagram of a frame structure of transmitted / received data. Next, the main points of the operation of the digital mobile telephone device will be described with reference to the flowchart of FIG. First, the control unit 7 sets 20 within the receivable section of the electric field strength (hereinafter referred to as “RSSI”) from the beginning of the diversity section.
RSSI reception processing is performed every ms (step S
1). Next, the threshold value judgment unit 15 judges whether or not the RSSI is equal to or higher than a predetermined threshold value which is a judgment value of level deterioration (step S2). The RSSI is stored in the memory 13b (step S
3). Next, the control unit 7 increments the value of the counter 14 by 1 (step S4). Next, the control unit 7 determines whether or not it is one superframe section (step S5),
If it is one superframe period, the counter determination unit 16
However, it is determined whether the value of the counter 14 exceeds a certain value (for example, 10) (step S6). If it exceeds, the control unit 7 sends the RSS stored in the memory 13b.
The values of I are summed, and the value is divided by the value of the counter 14 to obtain the average value of RSSI (step S7). Next, the control unit 7 resets the counter 14 and transmits the calculated average value of RSSI to the base station (step S
8) The routine is finished. If it is determined in step S6 that the value of the counter 14 does not exceed the certain value, the radio wave condition is bad, and the control unit 7
Value of RSSI stored in memory 13b and memory 1
The value of RSSI stored in 3c is summed, and the value is divided by 36 to obtain the average value of RSSI (step S
9) and proceeds to step S8. If it is determined in step S5 that it is not one superframe period, it means that 36 times of RSSI measurement for calculating the average value have not been completed, so this routine is ended. If it is determined in step S2 that the RSSI is not greater than or equal to the threshold value, the control unit 7 stores the RSSI in the memory 13c in order to exclude it from the calculation of the average value in step S7 (step S10). move on.

In this way, during 36 times of RSSI measurement,
If the number above the threshold exceeds 10 times, the average value of RSSI is calculated using only RSSI above the threshold.
The average value of RSSI becomes large as compared with the conventional device that always calculates the average value of RSSI including RSSI less than the threshold value. Further, when the number of times is equal to or larger than the threshold value and is equal to or smaller than 10 times, the average value of the RSSIs including the RSSIs smaller than the threshold value is calculated. Therefore, it is possible to satisfactorily prevent the operation of unnecessarily disconnecting the call and the unnecessary hand-off operation.

[0010]

As described above, according to the present invention, a cellular type digital mobile telephone apparatus in which a mobile unit measures the electric field strength of a received radio wave a predetermined number of times in a predetermined period and reports the average value to a base station. In (1), the mobile device has a threshold value judging means for judging whether the electric field strength is equal to or higher than a predetermined threshold value, and the number of times the electric field strength is judged to be equal to or higher than the threshold value by the threshold value judging means. Is a predetermined number of times within a predetermined number of times, and a threshold when the number of times the electric field strength is equal to or greater than a threshold value is determined to be a predetermined number or more by the number of times determination means. When the number of times that the electric field strength is equal to or greater than the threshold value is less than a certain number of times by the first calculation means that calculates the average value of the electric field strength that is equal to or more than the value, The second act of calculating the average value Means for reporting the calculation results of the first and second calculating means to the base station as an average value of the electric field strength, so that even in an area where the radio wave is weak, the call is unnecessarily disconnected or unnecessary. It is possible to satisfactorily prevent various hand-off operations.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a mobile device of a digital mobile telephone device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a frame structure of transmission / reception data.

FIG. 3 is a flowchart illustrating the operation of the digital mobile phone device according to the embodiment of the present invention.

[Explanation of symbols]

 7 control section 13b memory 13c memory 14 counter 15 threshold value judgment section 16 counter judgment section

Claims (1)

[Claims] 1. A cellular-type digital mobile telephone apparatus in which a mobile device measures the electric field strength of a received radio wave a predetermined number of times in a predetermined period and reports the average value to a base station. A threshold value judging means for judging whether or not it is a predetermined threshold value or more, and the number of times the electric field strength is judged to be the threshold value or more by the threshold value judging means is a fixed number of the predetermined number of times. When the number of times determining means for determining whether or not the above, the number of times the electric field strength is equal to or more than the threshold value is determined to be a certain number or more by the number of times determining means, When the number of times the electric field strength is equal to or higher than the threshold value is judged to be less than a certain number of times by the first calculation means for calculating the average value and the number of times judgment means, the average value of all electric field strengths is calculated. With the second calculation means Provided,
A digital mobile telephone device characterized in that the calculation results of the first and second calculation means are reported to the base station as an average value of the electric field strength.