JP2012090084A - Radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio device capable of detecting a battery voltage during reception without having means for recognizing a radio communication state and detecting the battery voltage.SOLUTION: The radio device used in a radio system for performing radio communication using a transmission slot and a reception slot includes: a battery constituting a power source of the radio device; a multiple voltage detection part for performing multiple voltage detection processing of repeatedly detecting a battery voltage which is an output voltage of the battery multiple times in a first cycle, and repeatedly performing the multiple voltage detection processing in a second cycle longer than the first cycle; and a reception voltage specification part for specifying the battery voltage detected at the timing of the reception slot from the plurality of battery voltages detected by the multiple voltage detection part.

Description

  The present invention relates to a technique for detecting the battery voltage of a radio device operating by a battery and reporting or displaying the remaining battery level in a radio device such as a mobile terminal used in a regional disaster prevention radio system. It is.

Currently, mobile communication systems such as digital regional disaster prevention radio systems are widely used in local governments in order to smoothly implement disaster prevention radio and administrative services. As the digital regional disaster prevention radio system is rapidly developing informatization in the public field, it will meet the diversifying needs of conventional voice-based mobile communication systems with higher compatibility with digital networks. There is a demand for a shift to an advanced mobile communication system that can flexibly respond.
As for the regional disaster prevention radio system, it was analog radio in the 800 MHz band, but it has been digitized as a public digital mobile communication system, and the transition from the analog system has progressed as a digital regional disaster prevention radio system in the 260 MHz band. It is in a state.

  A conceptual diagram of the regional disaster prevention radio system is shown in FIG. This system includes a control station 11 that performs communication control of the base station 12 and connection control with a ground line, a base station 12 that performs radio communication with a mobile terminal in its own zone or performs radio relay between mobile terminals, It consists of mobile terminals 13, 14, and 15 that move on land and perform wireless communication with a base station. As described above, there are various types of mobile terminals such as an in-vehicle mobile terminal 15 that can be attached to a car, a portable mobile terminal 14 that can be carried by one person, and a semi-fixed mobile terminal 13 that is grounded in a government building or indoors.

  Among the mobile terminals 13, 14, and 15, the portable mobile terminal 14 and the semi-fixed mobile terminal 13 can operate on a battery, and therefore, like a general public mobile phone, the display unit Is displayed. The remaining battery level is obtained by detecting the battery voltage inside the mobile terminal and displaying the remaining level from the detected voltage value.

The battery voltage detection method will be described below. The battery voltage is input to an A / D (Analog to Digital) port of a CPU (Central Processing Unit) of the mobile terminal, A / D converted inside the CPU, and a voltage value is detected.
The CPU has a timer inside, performs voltage detection processing of the A / D port at an arbitrary time period, and holds the detected voltage value in the internal memory of the CPU. Thereafter, the plurality of voltage values held in the internal memory are averaged and displayed. Since the battery voltage varies moderately over time, the timer time period is generally set to seconds to reduce the processing of the CPU.

  Next, a method for averaging detected voltage values will be described with reference to FIG. Here, the description will be made assuming that the time period for detecting the voltage of the CPU is 10 seconds and the averaging count is 3 times. As shown in FIG. 5, the CPU detects the first voltage value (sample 1) at the timing of sample 1 and stores it in the memory. The second voltage value (sample 2) is detected at the timing of sample 2 after 10 seconds, and the third voltage value (sample 3) is detected at the timing of sample 3 after 10 seconds. When the third voltage is detected, an average value (average 1) is calculated using the voltage values of samples 1 to 3. Further, in sample 4 after 10 seconds, an average value (average 2) is calculated using the voltage values of samples 2 to 4. As described above, the average value is calculated from the voltage values of three samples every 10 seconds and displayed as the remaining battery level.

By the way, in the regional disaster prevention radio system, wireless communication between a base station and a mobile terminal is performed by a TDMA (Time Division Multiple Access) method using different time slots for signal transmission and signal reception. FIG. 6 shows a frame configuration used in the regional disaster prevention radio system.
The frame configuration used in the regional disaster prevention radio system is 10 ms as 1 slot, 4 slots as 1 frame (40 ms), and 18 frames as 1 super frame (720 ms). Transmission and reception are performed in slot units, and FIG. 6 shows 1-slot transmission / 3-slot reception as an example.

Further, since the current consumption increases in the transmission period compared to the reception period, a voltage drop larger than that in the reception period occurs. For example, in the case of 1-slot transmission / 3-slot reception, when the battery voltage 71 is observed in slot units, as shown in FIG. 7, a voltage drop occurs in the transmission section 72, and the voltage value drops instantaneously.
Since the CPU does not recognize the wireless communication state of the mobile terminal, that is, the transmission state or the reception state, during the voltage detection process, there is a possibility of detecting the voltage at the time of transmission. In this case, the battery voltage is displayed lower than the actual voltage. For example, when the voltage at the time of transmission is detected in the sample 1 of FIG. 5 and the voltage at the time of reception is detected in the number of samples 2 to 4, the voltage value of the average 1 (average of the samples 1 to 3) 2 ( The voltage value (average of samples 2 to 4) becomes large, and it seems to the user that the remaining battery level has suddenly recovered.

  As described above, the battery voltage varies greatly depending on the timing at which the CPU detects the voltage and the wireless communication state of the mobile terminal. As means for recognizing the state of the wireless communication and detecting the voltage, a means such as an FPGA (Field Programmable Gate Array) managing the timing of the wireless frame reads the voltage value from the voltage detection A / D converter and notifies the CPU Can be considered. However, such means requires an additional circuit for the FPGA to detect the voltage, and there is a problem that the cost increases.

  Patent Document 1 listed below discloses that when performing signal communication with a battery power source in a mobile phone, the battery voltage detection means detects the voltage of the battery during the signal reception period (RX slot period).

JP 2002-217820 A

  The present invention has been made to solve the conventional problems as described above. The battery voltage at the time of reception can be obtained without providing a means for detecting the battery voltage by recognizing the wireless communication state by the FPGA or the like. It is an object of the present invention to provide a wireless device that can detect a battery, a wireless device that can display a battery remaining amount with little fluctuation by detecting a battery voltage at the time of reception, and a battery remaining amount detecting method. To do.

In order to solve the above problems, in the present invention, in a wireless device used in a wireless system that performs wireless communication using a transmission slot and a reception slot, a plurality of battery voltages are detected at a predetermined cycle, and the detected plurality of batteries are detected. The battery voltage detected at the receiving slot timing is specified from the voltages.
A typical configuration of the present invention is as follows. That is,
A wireless device used in a wireless system that performs wireless communication using a transmission slot and a reception slot,
A battery constituting the power supply of the radio;
A plurality of voltage detection processes for repeatedly detecting a battery voltage, which is an output voltage of the battery, a plurality of times in a first period are performed, and the plurality of voltage detection processes are repeatedly performed in a second period longer than the first period. Multiple voltage detectors;
A wireless device comprising: a reception voltage specifying unit that specifies a battery voltage detected at a timing of the reception slot from a plurality of battery voltages detected by the plurality of voltage detection units.

  According to the present invention, the battery voltage at the time of reception can be detected without providing means for recognizing the wireless communication state and detecting the battery voltage.

It is a figure which shows the structural example of a regional disaster prevention radio system. It is a figure which shows the example of a circuit structure based on the Example of this invention. It is a figure explaining the sampling process timing which concerns on the Example of this invention. It is a figure which shows the sampling process timing which concerns on the Example of this invention. It is a figure which shows the example of the calculation method of a battery voltage. It is a figure which shows the structural example of the flame | frame structure of a regional disaster prevention radio system. It is a figure which shows the example of a fluctuation | variation of the battery voltage at the time of radio | wireless transmission / reception.

As an example of the radio system according to the present invention, a configuration example of a regional disaster prevention radio system is shown in FIG. This system is a wireless system that performs wireless communication using a transmission slot and a reception slot, and includes a control station 11, a base station 12, and mobile terminals 13, 14, and 15. This system is the same as the regional disaster prevention radio system described in the background art, except for the process related to the battery voltage detection process of the mobile terminal described later.
Also, in this example, as shown in FIG. 6, the frame configuration used in the wireless communication between the base station and the mobile terminal is 10 ms as 1 slot, 4 slots as 1 frame (40 ms), and 18 frames as 1 frame. A super frame (720 ms) is used, and transmission and reception are performed in slot units, and 1-slot transmission and 3-slot reception are performed.

  For example, the portable mobile terminal 14 that is a wireless device includes a transmission unit and a reception unit for wireless communication with a base station, a display unit for performing various displays, and a battery that constitutes the power source of the portable mobile terminal 14 , Equipped with a memory (storage unit) for storing the battery voltage detection value and the like, a control unit for controlling the operation of the portable mobile terminal 14, etc., and can be operated with a battery, and the remaining battery level is displayed on the display unit Is done. As for the remaining battery level, the battery voltage inside the mobile terminal is detected, and the remaining battery level is displayed based on the detected voltage value.

FIG. 2 shows a configuration example of a circuit block for detecting the battery voltage in the portable mobile terminal 14. The battery voltage, which is the output of the battery 21, is divided below the power supply voltage by the voltage dividing resistor circuit 22, is input to the A / D port 25 of the CPU 23, is A / D converted inside the CPU, and the voltage value is detected. The
The reason why the voltage dividing resistor circuit 22 is provided is that the power supply voltage of the CPU is 3.3 V, for example, and therefore the signal level that can be input to the A / D port 25 needs to be 3.3 V or less of the power supply voltage. The resistor circuit 22 prevents the battery voltage from being input to the A / D port 25 as it is.

In this example, the CPU 25 has a 10 ms timer 27 (first timer) and a 10 s timer 26 (second timer) inside. The 10 ms timer 27 outputs the first timing signal at the first cycle (10 ms). The 10s timer 26 outputs the second timing signal in a second period (10s) longer than the first period. The first period of 10 ms is matched to the transmission and reception slot times.
The CPU 25 performs a plurality of voltage detection processes for detecting a plurality of battery voltages every 10 s which is a period (second period) of the 10 s timer 26, and receives the received voltage from a plurality of battery voltages detected by the plurality of voltage detection processes. A reception voltage specifying process for specifying the battery voltage detected at the slot timing is performed, and the remaining battery level is displayed on the display 24 based on the battery voltage specified by the reception voltage specifying process. As described above, the CPU 25 includes a multiple voltage detection unit that performs multiple voltage detection processing and a reception voltage specification unit that performs reception voltage specification processing.

The multiple voltage detection process for detecting multiple battery voltages will be described. The CPU 25 performs a sampling process for detecting the voltage of the A / D port 25 every 10 ms, which is the period (first period) of the 10 ms timer 27, and holds the detected voltage value in the internal memory of the CPU.
As shown in FIG. 3, in this example, the sampling process is performed four times every 10 ms which is the first period. The four times of sampling processing constitutes one time of multiple voltage detection processing. In FIG. 3, the battery voltage 31 repeats a state where the voltage drops at the time of transmission of 10 ms 32 and recovers at the time of reception of 30 ms 33. Here, since the clock of the radio frame and the clock in the CPU 23 are asynchronous, the timing of the sampling process is not constant and always fluctuates as shown in pattern 1 to pattern 3 in FIG. Patterns 1 to 3 are examples, and there are various other timing relationships. However, since the sampling process of the first period of 10 ms is performed four times regardless of the timing relationship, the sampling process at the time of transmission 32 is performed once and the sampling process of the reception 33 is performed three times. Thus, the battery voltage 31 when the wireless communication state is the reception time 32 can always be sampled.

  In the example of 1-slot transmission / 3-slot reception in FIG. 3, even if the sampling process is performed twice at intervals of 20 ms, the battery voltage 31 at the time of reception 33 can always be sampled. The mobile terminal of the system can perform 2-slot transmission / 2-slot reception and 3-slot transmission / 1-slot reception communication according to the setting, so it is preferable to perform sampling processing four times at a cycle of 10 ms.

Next, a reception voltage specifying process for specifying the battery voltage detected at the timing of the reception slot from among a plurality of detected battery voltages will be described.
When the four sampling processes described above are completed, that is, when one multiple voltage detection process is completed, the CPU 23 compares the four voltage values detected by the sampling process, and, for example, determines the maximum voltage value in the reception slot. The battery voltage detected at the timing is specified, and is stored in a memory inside the CPU 23 as a sample to be described later.
For example, in the example of pattern 2 in FIG. 3, since the sampling 3 at the time of transmission 32 has a smaller voltage value than any other, one of the voltage values detected at the samplings 1, 2, and 4 at the time of reception 33 is the maximum value. Theoretically, since the battery voltage 31 gradually decreases, the voltage value of the sampling 1 should be maximum. However, in an actual circuit, a quantization error is generated due to noise of the battery voltage 31. The voltage value of sampling 1 does not necessarily become the maximum.

  As described above, in the example shown in FIG. 3, in the frame configuration of 1-slot transmission / 3-slot reception, the sampling process is performed four times every 10 ms, which is the slot interval. The battery voltage value at the time of sampling is selected. When a value other than the minimum value is selected, the battery voltage value at the time of reception 33 is always determined. When the maximum value is selected, naturally, the value at the time of sampling at the time of reception 33 is selected. Battery voltage value. Therefore, in this case, a voltage value other than the minimum value can be specified as the battery voltage detected at the timing of the reception slot.

  Even in various frame configurations such as 2-slot transmission / 2-slot reception and 3-slot transmission / 1-slot reception, a sampling interval is set at least once so that the battery voltage can be detected at the timing of the reception slot. The battery voltage detected at the timing of the reception slot can be specified by performing the sampling process once and comparing the plurality of voltage values detected by the plurality of sampling processes. For example, the maximum voltage value among the plurality of voltage values can be specified as the battery voltage detected at the timing of the reception slot.

  The multiple voltage detection process, the reception voltage specifying process, and the averaging process described below are repeatedly executed every second period of 10 s as shown in FIG. The CPU 23 performs an averaging process for calculating an average value from the voltage values of a plurality of samples held in the memory by the voltage determination process at the time of reception, for example, the voltage values for three samples of samples 1 to 3, and the averaging process Based on the calculated average value, the remaining battery level is displayed on the display 24 as a display unit. After that, as shown in FIG. 5, the average value is calculated from the voltage value of three samples for every second period of 10 s, and is displayed on the display 24 as the remaining battery level. Since the description of the averaging process in FIG. 5 is as described above, it is omitted here.

  As described above, in this example, even if the CPU 23 does not recognize whether the radio is in a transmission state or a reception state, the number of slots in one frame is equal to one slot time period regardless of the transmission / reception timing. The battery voltage is detected by sampling, the maximum value among the detected voltages is determined, and the maximum value is used as the detection voltage, so that the battery voltage at the time of reception can always be detected.

In the embodiment described above, the 10 ms timer 27 is used as the above-described sampling processing cycle. However, if the slot time of the wireless system is other than 10 ms, the timer 27 is naturally changed to match the slot time. It can respond by doing. Similarly, the timing period of the multiple voltage detection process, the reception voltage specifying process, and the averaging process other than 10 s can be handled by changing the period of the 10 s timer 26.
Further, the present invention can be grasped not only as a device for executing the processing according to the present invention, but also as a method, a program for realizing such a method, a recording medium for recording the program, or the like. .

This specification includes the following inventions.
The first invention is
A wireless device used in a wireless system that performs wireless communication using a transmission slot and a reception slot,
A battery constituting the power supply of the radio;
A plurality of voltage detection units for performing a plurality of voltage detection processing for repeatedly detecting a battery voltage, which is an output voltage of the battery, a plurality of times in a first cycle;
A wireless device comprising: a reception voltage specifying unit that specifies a battery voltage detected at a timing of the reception slot from a plurality of battery voltages detected by the plurality of voltage detection units.
According to such a configuration, the battery voltage at the time of reception can be detected without providing a means for recognizing the wireless communication state and detecting the voltage.

The second invention is
The wireless device according to the first invention,
A wireless device used in a wireless system that performs wireless communication using a transmission slot and a reception slot,
The multiple voltage detection unit repeatedly performs the multiple voltage detection process in a second cycle longer than the first cycle.
According to such a configuration, multiple voltage detection processing can be performed intermittently, and power consumption can be reduced.

The third invention is
The wireless device according to the first invention or the second invention,
The wireless device according to claim 1, wherein the first period is a slot interval between the transmission slot and the reception slot.
According to such a configuration, it becomes easy to detect the battery voltage at the time of reception.

The fourth invention is:
The wireless device according to any one of the first to third inventions,
The reception voltage specifying unit specifies the maximum battery voltage as the battery voltage detected at the timing of the reception slot from the plurality of battery voltages detected by the plurality of voltage detection units in the first period. A radio characterized by.
According to such a configuration, it becomes easy to detect the battery voltage at the time of reception.

The fifth invention is:
The wireless device according to any one of the first to fourth inventions,
A wireless device comprising an averaging processing unit that averages a plurality of battery detection voltages specified by the reception voltage specifying unit, wherein the average value calculated by the averaging processing unit is used as a battery detection voltage.
According to such a structure, it can suppress being influenced by the short-term time fluctuation of a battery voltage.

The sixth invention is:
The wireless device according to any one of the first to fifth inventions,
A wireless circuit comprising a voltage dividing resistor circuit that divides the battery voltage into a voltage value smaller than the battery voltage, and inputs the voltage divided by the voltage dividing resistor circuit to the plurality of voltage detection units. Machine.
According to such a configuration, the voltage input to the plurality of voltage detection units can be made lower than the battery voltage that is the power supply voltage.

The seventh invention
A battery remaining amount display method used in a wireless device that performs wireless communication using a transmission slot and a reception slot,
A plurality of voltage detection steps for detecting a plurality of battery voltages, which are output voltages of the battery, in a first cycle;
A reception voltage specifying step for specifying the battery voltage detected at the timing of the reception slot from the plurality of battery voltages detected in the multiple voltage detection step;
A battery remaining amount display method, comprising: displaying a battery remaining amount based on the battery voltage specified in the reception voltage specifying step.
According to such a configuration, the battery voltage at the time of reception can be detected without providing a means for recognizing the wireless communication state and detecting the voltage.

The eighth invention
The battery remaining amount display method according to the seventh invention,
The battery residual quantity display method characterized by performing the said multiple voltage detection step for every 2nd period longer than the said 1st period.
According to such a configuration, multiple voltage detection processing can be performed intermittently, and power consumption can be reduced.

  11: Control station, 12: Base station, 13: Semi-fixed type mobile terminal, 14: Portable type mobile terminal, 15: In-vehicle mobile terminal type, 16: PC for data transmission, 21: Battery, 22: Voltage divider resistor circuit, 23: CPU, 24: display, 25: A / D port, 26: 10s timer, 27: 10 ms timer.

Claims (1)

A wireless device used in a wireless system that performs wireless communication using a transmission slot and a reception slot,
A battery constituting the power supply of the radio;
A plurality of voltage detection processes for repeatedly detecting a battery voltage, which is an output voltage of the battery, a plurality of times in a first period are performed, and the plurality of voltage detection processes are repeatedly performed in a second period longer than the first period. Multiple voltage detectors;
A wireless device comprising: a reception voltage specifying unit that specifies a battery voltage detected at a timing of the reception slot from a plurality of battery voltages detected by the plurality of voltage detection units.

Images