JPH0730950A - Control method for digital mobile telephone system - Google Patents

Abstract

PURPOSE:To reduce power consumption in the setting of a standby state by detecting a predetermined number of reception levels in a perch channel stored when a mobile equipment is at the outside of a zone and executing channel scan processing when a level of a threshold level or over is in existence CONSTITUTION:When a mobile equipment is discriminated to be located at the outside of a mobile station service area zone, the reception level is detected intermittently by a predetermined number of channels among a perch channel stored in advance by a mobile station. When it is discriminated that there is a perch channel with a reception level of a predetermined threshold level or over, the reception level is measured by using all perch channels as objects and the perch channel is scanned. It is quickly detected that the mobile station moves from outside of the zone into the zone by measuring the reception level and decreasing the total number of perch channels and the standby state is set and the power consumption for the case is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a digital car telephone system.

[0002]

2. Description of the Related Art Digital car telephone systems are described in "Digital car telephone system standard (RCR ST
D-27) ”. Thus, the operation of the mobile station after the power is turned on will be described with reference to FIG.

After powering on the mobile station, first the hardware,
After performing the power-on process 1 for initializing the software, the process proceeds to the perch channel scan process 2. In the perch channel scanning process 2, the mobile station measures all the reception levels of the perch channels stored in advance, and if there is a perch channel having a value equal to or greater than a certain threshold value (hereinafter referred to as an effective perch channel), The process proceeds to standby channel selection processing 3.

In the standby channel selection processing 3, the effective perch channels are rearranged in descending order of reception level.
The data sent on the channel with the highest reception level is received, and it is checked whether it is suitable as a standby channel. That is, information called broadcast information is received, and it is determined whether the standby permission level or the network number is appropriate.
If it is not suitable, the data sent on the next higher level channel is received, and it is checked whether it is also suitable as a standby channel. If there is an appropriate channel, the process proceeds to standby processing 4. The above processing is performed until there are no more effective perch channels.

In the standby processing 4, while waiting for the user's outgoing operation and incoming call from the network while measuring the reception level. When the reception level becomes poor, such as when the reception level becomes unsuitable for the standby state due to movement of the mobile station or the like, the process returns to the perch channel scanning process 2. If there is a call operation, the process proceeds to call processing 5. If there is an incoming call notification, the process proceeds to incoming call processing 6.

In the outgoing call processing 5 and the incoming call processing 6, after transmitting / receiving information necessary for shifting to communication with the network,
The communication channel is switched to according to the information from the network, and the process proceeds to the communication process 7. If the switching to the communication channel fails, the process may return to the perch channel scanning process 2.

In the communication process 7, voice communication is performed after transmitting / receiving necessary information to / from the network. The disconnecting operation is your mobile station,
Or in the case of normal disconnection as done by the communication destination,
The process returns to the standby process 4, and if the electric wave is cut off abnormally or otherwise, the process returns to the perch channel scan process 2.

If it is determined in the perch scanning process 2 that there are no valid perch channels, or if there is no suitable channel as a standby channel in the standby channel selection process 3, it is determined to be out of service and out of service is performed. 8 is executed. For out-of-range processing 8,
Although not specified in the above standard, it is generally conceivable to repeatedly execute the perch channel scan 2.

[0009]

By the way, since the mobile station is supposed to move, it may move into the service area after it is determined to be out of service. However, considering the convenience of the user, It is desirable to be in a standby state immediately. Therefore, the mobile station repeatedly performs the perch channel scanning process 2 even after determining that it is out of range. When the mobile station stays out of the area, as a result, the perch channel scanning process is always performed, resulting in wasteful power consumption. In order to reduce this power consumption, the perch channel scanning process 2 may be performed intermittently after it is determined that the mobile station is out of the service area. Considering the convenience, it is better that the time between these is shorter.

It is an object of the present invention to solve such a problem, to promptly detect that a mobile station has moved from outside the service area to within the service area and set the mobile station to a standby state, and to reduce the power consumption at that time as much as possible. To do.

[0011]

In order to solve the above-mentioned problems, the present invention, when it is determined that the mobile station is located outside the service area of the digital car telephone system, moves the mobile station into the service area and moves there. In order to move to a standby state where the station can make and receive calls,
In the control method of the digital car telephone system that measures the reception level of the perch channel for the purpose of determining out-of-range, the perch channel stored in the mobile station in advance when it is determined to be out of range Select some perch channels from among the above, measure the reception level of the selected perch channels, and intermittently perform a simple scanning process to determine whether there are perch channels with reception levels above a specified threshold. And performing a perch channel scanning process when there is a perch channel having a reception level higher than a certain threshold.

Further, according to the present invention, when it is determined that the mobile station is located outside the service area of the digital car telephone system, the mobile station moves into the service area and the mobile station shifts to a communication standby state in which the mobile station can make and receive a call. The perch channel reception level is measured for the purpose of determining the in-range / out-of-range, and the perch channels with reception levels above a predetermined threshold are received in order from the highest reception level. In the control method of the digital car telephone system that executes the perch channel scan processing and the standby channel selection processing that determines whether or not it is appropriate for the standby mode, the standby channel is used when the processing for selecting one standby channel is performed. Storing the perch channel that is determined not to be, When it is determined to be outside, select some perch channels from the perch channels stored in advance by the mobile station excluding the stored perch channels, and measure the selected perch channel reception level. However, a simple scan process is performed intermittently to determine whether there are perch channels with a reception level above a certain threshold, and a perch channel scan is performed when there are perch channels with a reception level above a certain threshold. It is characterized by executing processing.

[0013]

When the mobile station is determined to be located outside the service area of the mobile station, the mobile station does not measure the reception levels of all the perch channels stored in advance, but selects a predetermined one from among the perch channels stored in advance. When the reception level is detected intermittently for each number of channels and it is determined that there is a perch channel with a reception level above a predetermined threshold value, the reception level is measured for all perch channels. Done.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a hardware block diagram of a mobile station embodying the present invention. The radio wave received through the antenna 9 is tuned by the RF / IF unit (reception system) 10, and the tuned channel signal is passed to the TDMA processing circuit (reception system) 12 through the demodulator 11. The RF / IF unit (reception system) 10 also notifies the microcomputer 13 of the reception level of the tuned channel. TDMA processing circuit (reception system) 1
In 2, the control information and the voice information are extracted from the received signal, the control information is sent to the microcomputer 13, and the voice information is sent to the D / A.
Pass to circuit 14. The D / A circuit 14 converts the received digital audio information into an analog audio information and passes it to the audio processing circuit 15. The voice processing circuit 15, which receives the voice information converted into analog data, causes the ringer 16 or the speaker 17 to ring based on the voice information in accordance with an instruction from the microcomputer 13. The voice processing circuit 15 also picks up the voice from the microphone 18 and converts it into an analog signal, and passes it to the A / D circuit 19.

The analog voice information is converted into digital voice information by the A / D circuit 19 and passed to the TDMA processing circuit (transmission system) 20. TDMA processing circuit (transmission system) 2
At 0, the voice information from the A / D circuit 19 and the microcomputer 13
The information required for communication is combined with the control information from (1), and a transmission signal is sent through the modulator 21 and passed to the RF / IF unit (transmission system) 22. The RF / IF unit (transmission system) 22 puts the same signal on the frequency designated by the PLL frequency synthesizer 23, and sends the signal to the air through the antenna 9. The PLL frequency synthesizer unit 23 gives a frequency tuning signal to the RF / IF unit (reception system) 10 or the RF / IF unit (transmission system) 22 according to an instruction from the microcomputer 13.

The display section 24 provides a display that can be recognized by the user in response to an instruction from the microcomputer 13, and the key section 25 notifies the microcomputer 13 of the user's operation. The microcomputer 13 is R
The reception level from the F / IF unit (reception system) 10 is changed to TDMA.
The control information is obtained from the processing circuit (transmission system) 12, the operation content of the user is obtained from the key section 25, the transmission control information is given to the TDMA processing circuit (transmission system) 20, the voice processing circuit 15,
While controlling the display unit 24 and the PLL frequency synthesizer unit 23, each process shown in FIG. 1 is performed in order to manage and control the mobile station.

The structure of the microcomputer 13 is shown in FIG. The microcomputer 13 includes a CPU 26 that performs each process, a ROM 27 that stores a program for a process procedure, a RAM 28 that temporarily stores and temporarily reads out data necessary for each process,
And interfaces 29 to 35 with each hardware
Consists of.

Next, the control method of the digital car telephone system according to the present invention will be described with reference to the flow charts of FIGS.

First, as described with reference to FIG. 1, the mobile station performs power-on processing for initializing hardware and software after power-on, and then performs perch channel scanning processing. With the perch channel scanning process,
The mobile station measures all the reception levels of the perch channels stored in advance, and if there is an effective perch channel, executes the flowchart of the standby channel selection processing shown in FIG. In this standby channel selection process,
First, the number of perch channels (effective perch channels) having a reception level value equal to or higher than a certain threshold value obtained by the perch channel scanning process in the previous stage is set (36).
Next, the effective perch channels are rearranged in descending order of their reception levels (37). Next, the pointer of the array of the rearranged effective perch channels is initialized to point to the beginning of the array (38). Next, the perch channel indicated by this pointer is read (39). Then, the broadcast information transmitted on that channel is received (40).

Next, the control information in the broadcast information is analyzed to check whether the current receiving channel is suitable as a standby channel, that is, whether the standby permission level or the network number is appropriate (41 ), If appropriate, go to standby processing.

If the current reception channel is not suitable as a standby channel, the current reception channel is not suitable for standby and is stored in the list of non-standby channels (42).

Then, the number of effective perch channels set in (36) is subtracted by one (43). If the number of effective perch channels becomes 0 (44), the process goes out of range. If it is not 0, the pointer of the effective perch channel array is updated (45) and the process returns to (39).

The out-of-service process is executed according to the flowchart shown in FIG. That is, the wait timer is initialized in order to make a certain waiting time first (4
6). This wait timer is an interrupt process that is executed at regular time intervals, and is decremented by one.
Wait until (47).

Next, when the reception level is measured, the number of perch channels is set (48). That is, assuming that the number of channels scanned at one time in the perch channel scan performed intermittently is 4, for example, a value of 4 is set as the counter value as the number of perch channels.

Next, when the present reception level of the perch channel array stored in the ROM is measured, the value of the pointer indicating the perch channel is read (49). This pointer is initialized to 0 when the power is turned on and is updated by the processing described below. Next, the perch channel indicated by the pointer is read (50). Next, this pointer is updated (51).

Next, it is checked whether the read perch channel is included in the list of non-standby channels (52). If it is included, the process returns to (49). If not included, the reception level of the channel is measured (53). If the measured reception level is higher than a certain threshold value (54), it is determined that the mobile station has already entered the service area, and the process proceeds to the perch channel scanning process.

Otherwise, when the current reception level set in (48) is measured, the number of perch channels is decremented by one (55). If the number of perch channels is not 0 (5
Return to 6) and (49). If it is 0, the process returns to the beginning of the out-of-service process.

If the mobile station is determined to be out of the service area when the processing is performed according to such a flow chart, the reception level is intermittently increased by a preset number of channels (4 channels in this embodiment). To be measured. At this time, the reception level is measured by omitting the perch channel that is determined to be not the standby channel in the standby channel selection processing when the power is turned on.

For example, considering the case where the present invention is not applied and the case where the present invention is applied to a mobile station in which 100 perch channels are stored in a ROM in advance, the following is obtained.

If it takes 5 milliseconds to measure the reception level of one perch channel, it takes 500 milliseconds to measure the reception level of all perch channels. If it is determined that the perch is not in the service area, the perch channel scanning process, which takes 500 milliseconds, is always performed unless the wait is performed until the next perch channel scanning process is performed.

If a weight of 49.5 seconds is applied when it is determined that the mobile station is out of the service area, the power consumption when the mobile station is out of the service area (out of the service area) is 1/100 on average. However, for ease of consideration, power consumption other than that used for measuring the reception level is ignored.

However, in this case, when the mobile station moves from the outside of the service area to the inside of the service area, the mobile station cannot enter the standby state for a maximum of 50 seconds. This is not preferable considering the convenience of the user.

Considering the case where the present invention is applied to the above-mentioned mobile station, when the reception levels of four perch channels are measured every 1.98 seconds in the out-of-range processing, the average when the mobile station is out of the service area. The power consumption is the same as above. However, since the reception level of the perch channel is measured every 1.98 seconds, when the mobile station enters the service area from outside the service area, it can be expected to enter a standby state faster, which is convenient for the user. Will increase. In particular, when the perch channel is selected when the reception level is detected at the same time in the out-of-range processing, considering the allocation of the perch channel in each service area, the expected value of faster transition to the standby state increases.

Further, by removing the perch channel which is effective for the reception level but is unsuitable for the standby channel from the target of the reception level measurement in the out-of-service processing,
This is useful for avoiding useless perch channel scanning processing, which is effective for further reduction of power consumption. In addition, when the reception level is measured, the total number of perch channels can be reduced, so that when the mobile station moves from the outside of the service area to the inside of the service area, a faster transition to the standby state can be expected.

[0035]

As described above, according to the control method of the digital type automobile telephone system of the present invention, it is possible to promptly detect that the mobile station has moved from the out-of-range area to the in-range area and set the standby state. The power consumption can be reduced as much as possible.

[Brief description of drawings]

FIG. 1 is a schematic flowchart of processing of a mobile station.

FIG. 2 is a block diagram of a digital car telephone system according to the present invention.

FIG. 3 is a block diagram of a microcomputer of a digital car telephone system according to the present invention.

FIG. 4 is a flowchart showing a control method of standby channel selection processing of the digital car telephone system according to the present invention.

FIG. 5 is a flowchart showing a method of controlling out-of-service processing of the digital car telephone system according to the present invention.

[Explanation of symbols]

 1 Processing when mobile station is powered on 2 Perch channel scan processing 3 Standby channel selection processing 4 Mobile station standby processing 5 Mobile station outgoing processing 6 Mobile station incoming processing 7 Mobile station communication processing 8 Mobile station Out-of-range processing 18 Antenna 19 RF / IF unit (reception system) 20 Demodulator 21 TDMA processing circuit (reception system) 22 Microcomputer 23 D / A circuit 24 Voice processing circuit 25 Ringer 26 Speaker 27 Microphone 28 A / D circuit 29 TDMA Processing circuit (transmission system) 30 Modulator 31 RF / IF section (transmission system) 32 PLL frequency synthesizer section 33 Display section 34 Key section 35 CPU 36 ROM 37 RAM 38 TDMA processing circuit (reception system) interface 39 TDMA processing circuit (transmission) System) interface 40 RF / IF unit (reception system) interface Over scan 41 display unit interface 42 key unit interface 43 PLL frequency synthesizer unit interface 44 audio processing circuit interface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location 7304-5K H04Q 7/04 J

Claims (2)

[Claims] 1. When a mobile station is determined to be outside the service area of a digital car telephone system, the mobile station moves into the service area, and the mobile station enters a communication standby state in which it can make and receive calls. In the control method of the digital mobile phone system that measures the perch channel reception level for the purpose of determining within-range / out-of-range, the mobile station stores it in advance when it is determined to be out of range in the control method of the digital mobile phone system. Select some perch channels from the perch channels, measure the reception level of the selected perch channels, and perform a simple scan process to determine whether or not there are perch channels with reception levels above a predetermined threshold. If there is a perch channel with a reception level above a certain threshold intermittently. The method of digital automobile telephone system and executes a perch channel scanning process. 2. When the mobile station is determined to be located outside the service area of the digital car telephone system, the mobile station moves into the service area, and the mobile station enters a communication standby state in which it can make and receive calls. The reception level of the perch channel is measured for the purpose of determining the inside / outside area, and the perch channels with the reception level higher than a predetermined threshold value are received in order from the one with the highest reception level. In the control method of the digital car telephone system that executes the perch channel scanning process and the standby channel selection process that determines whether or not it is appropriate, when performing the process of selecting one standby channel, it must be the standby channel. It stores the determined perch channel and determines that it is out of range. At this time, the mobile station selects some perch channels from the perch channels stored in advance by the mobile station, excluding the stored perch channels, measures the reception level of the selected perch channels, and determines the predetermined level. Performing a simple scan process intermittently to determine whether there is a perch channel with a reception level above a threshold value, and executing a perch channel scan process when there is a perch channel with a reception level above a certain threshold. Control method for digital car telephone system characterized by