JPH09289679A - Mobile radio terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile radio terminal equipment in which consumption of its battery is small and a channel is quickly recovered by setting a retrial time interval of reconnection of the channel depending on an interrupt state when the channel is interrupted. SOLUTION: This terminal has an RSSI averaging processing section 5 periodically averaging processing to a strength of a received signal, an RSSI differentiation processing section 6 calculating a differentiation value being a timewise change in the strength of the received signal subjected to averaging processing, and a control section 4 controlling the entire terminal. The control section 4 controls the trial time interval so that the trial time interval of line reconnection is short when the absolute value of a differentiated strength of the received signal is a prescribed value or over and the trial time interval of line reconnection is long when the absolute value of a differentiated strength of the received signal is a prescribed value or below.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mobile radio terminal in a mobile communication system such as a cellular telephone, and more particularly,
The present invention relates to a mobile radio terminal having a function of automatically reconnecting when a line is disconnected.

[0002]

2. Description of the Related Art Conventionally, in a mobile communication system such as a cellular telephone, a mobile radio terminal moves within a communicable service area composed of a plurality of radio base stations for communication. In such a mobile communication system, the line is disconnected when the connection status of the communication line deteriorates because the received signal strength of the radio channel decreases. In this way, when the line is disconnected during the line connection, the reconnection operation is automatically performed to reconnect the line.

Generally, when a line is disconnected during the line connection and an attempt is made to automatically reconnect the line, a trial time interval for the reconnection operation is set to be short in order to quickly recover the line. .

[0004]

By the way, when the trial time interval of the reconnection operation is set short as described above, the mobile radio terminal moves out of the service area of the radio base station and the line is disconnected. In the case where the line is unlikely to be connected as in the case, the number of trials of useless reconnection operation increases, which causes a problem that the battery of the mobile wireless terminal is rapidly consumed.

On the other hand, when the trial time interval of the reconnection operation is set to be long, it is possible to reduce the battery consumption as described above, but the mobile radio terminal is within the service area of the base station. , When the line is temporarily disconnected due to entering a shadow of a tunnel or a building, that is, in a situation where the line is likely to be connected, the number of trials of reconnection operation until the line is restored may be small, Since the time interval between reconnection attempts is long, it takes a long time to recover the line.

The present invention has been made in order to solve the above problems, and an object thereof is to estimate a situation in which a line is disconnected and set a trial time interval for reconnection operation of the line in accordance with the disconnection condition. It is an object to provide a mobile radio terminal that can be set quickly so as to recover the line with less battery consumption.

[0007]

In order to solve the above-mentioned problems, a mobile radio terminal of the present invention performs radio mobile communication with a radio base station and reconnects the communication line when the communication line is disconnected. In the mobile radio terminal performing the trial time interval of, the trial time interval of the reconnection of the line is set according to the received signal strength immediately before the line is disconnected.

According to the above configuration, for example, if the received signal strength immediately before the disconnection of the line is equal to or more than the predetermined value, it is determined that the wireless base station is temporarily disconnected, and the reconnection trial time interval is set. By making the length shorter than the predetermined value, it is possible to quickly restore the line in a situation where the line is likely to be recovered. If the reception strength immediately before the line is smaller than the predetermined value, it is determined that the mobile wireless terminal has moved out of the service area of the wireless base station and the line has been disconnected, and the reconnection trial time interval is lengthened to a predetermined value or more. As a result, it is possible to reduce battery consumption due to repeated reconnection operations in a situation where the line recovery probability is low.

In order to solve the above-mentioned problems, a mobile radio terminal according to a second aspect performs radio mobile communication with a radio base station and reconnects the communication line at a predetermined trial time interval when the communication line is disconnected. In the mobile radio terminal, a radio unit that transmits and receives a signal to and from the radio base station, a signal strength averaging processing unit that periodically averages the strength of signals received by the radio unit, and an averaging process. When the absolute value of the differential value of the received signal strength is equal to or more than a predetermined value at the time of disconnection of the line, the signal strength differential processing unit that calculates the differential value indicating the temporal change rate of the received signal strength Control to control the trial time interval so that the trial time interval for connection is shortened, and the trial time interval for line reconnection is lengthened when the absolute value of the differential value of the received signal strength is smaller than a predetermined value. It is equipped with It is characterized in.

According to the above configuration, when the line is disconnected, the control unit can estimate the line disconnection state based on the differential value of the signal strength differential processing unit immediately before the line disconnection. By adjusting the time interval for reconnection of the line according to the situation, it is possible to quickly recover the line while reducing battery consumption.

That is, when the differential value of the received signal strength is a positive number or the absolute value thereof is smaller than a predetermined value, it indicates that the received signal strength is changing gently, and it is estimated that the received signal strength is moved out of the service area. Therefore, it is possible to reduce the consumption of the battery by setting the reconnection trial time interval to be long. Also, when the differential value of the received signal strength is a negative value or an absolute value equal to or more than a predetermined value, it indicates that the received signal strength has changed rapidly, which is a temporary shadowing such as passing through a tunnel in the service area. Since it is highly probable that the line reconnection trial time interval is set to be short, the line can be quickly recovered after the shadowing is resolved.

In order to solve the above-mentioned problems, a mobile radio terminal according to a third aspect of the present invention has a configuration in which, in addition to the configuration of the second aspect, the control section includes:
It is characterized in that the time interval for reconnection of the line is controlled so as to be inversely proportional to the magnitude of the differential value of the received signal strength.

According to the above configuration, in addition to the operation of claim 2, the line reconnection operation can be performed at the trial time interval corresponding to the differential value for estimating the line disconnection state immediately before the line disconnection. , The line is restored properly according to the situation when the line is disconnected. Therefore, by reducing the unnecessary reconnection operation of the line in the situation where the line recovery is unlikely, the battery consumption of the mobile wireless terminal is reduced and the line recovery in the situation where the line recovery is high is expected. Can be done quickly.

In order to solve the above-mentioned problems, a mobile radio terminal according to a fourth aspect of the present invention is, in addition to the configuration of the second aspect, a control section,
If the average value of the received signal strength that has been averaged at the time of line disconnection is smaller than the reception sensitivity value in the radio section, the trial time interval for line reconnection is set to the preset trial time for line reconnection. The feature is that it is set to the maximum value of the interval.

According to the above construction, in addition to the function of claim 2, when the received signal strength is unstable, such as in the peripheral portion of the service area of the radio base station, the trial time of the reconnection operation of the line is tried. By setting the interval to the maximum value, it is possible to reduce the number of unnecessary line reconnection operations that accompany intermittent line disconnections under unstable received signal strength conditions. Battery consumption can be reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention in reference to FIG.

The mobile radio system according to the present embodiment comprises a plurality of radio base stations forming a service area of a radio line, and a mobile radio terminal performing radio mobile communication with these radio base stations.

The mobile radio terminal, as shown in FIG.
A radio unit 1 for transmitting and receiving radio waves to and from a radio base station (not shown), a data processing unit 2 for performing a predetermined process on a transmission / reception signal, a voice processing including a microphone (speaker) and an ear speaker (receiver). Unit 3, control unit 4 for controlling the entire mobile radio terminal, RSSI averaging unit 5 for averaging the received signal strength (hereinafter referred to as RSSI), RSSI differentiation processing unit for differentiating the averaged RSSI. 6
Consists of

In the data processing unit 2, during operation of the mobile radio terminal, a signal from the radio base station inputted via the radio unit 1 is separated into voice data and control data, and the voice data is sent to the voice processing unit 3. While outputting, the control data is output to the control unit 4. On the other hand, when transmitting the voice data from the voice processing unit 3 to the radio base station, the voice data and the control data from the control unit 4 are integrated and output to the radio base station via the radio unit 1. It has become.

In the voice processing unit 3, the voice data input from the ear speaker is reproduced as a received voice, while the voice input from the microphone is converted into voice data,
The data is output to the data processing unit 2.

The RSSI averaging processing unit 5 takes in the received signal strength data of the radio unit 1 at regular time intervals (for example, every 20 msec) and performs averaging processing, and the past N averaged RSSI _N sample data (however, , N is an integer of 1 or more). Then, the averaged RSSI _N sample data is sent to the control unit 4 and R
It is adapted to be output to the SSI differentiation processing section 6.

The RSSI differential processing section 6 calculates the rate of change for each time from the N sample data of the RSSI averaging processing section 5 to calculate the differential value of RSSI. For example, RSS for the latest Nth sample
The differential value RSSIdifN _{N of I} is RSSI _N-1 −RSSI
It can be calculated by _N. Then, the calculated differential value R
The SSIdif is stored in the RSSI differentiation processing unit 6 and is output to the control unit 4.

The control unit 4 controls the line based on the control data from the data processing unit 2, and also averages the RSSI _N sample data from the RSSI averaging processing unit 5 and the differential from the RSSI differential processing unit 6. Value RSSIdif
Based on the above, the reconnection operation when the line is disconnected is controlled. That is, the control unit 4 has a function of automatically attempting a line reconnection operation when the line is disconnected during the line connection.

That is, the control unit 4 causes the RS
If the SI level drops and the connection of the communication line cannot be maintained, the communication line is disconnected and the RSSI
RSS stored in the differential processing unit 6 immediately before line disconnection
By referring to the I differential value, the situation at the time of disconnection of the line is estimated from this RSSI differential value, the reconnection trial time interval is set from the situation at the time of line disconnection estimated from this RSSI differential value, and the reconnection operation is performed. Is supposed to do.

Generally, the reason why the line is disconnected during the line connection is that when the mobile radio terminal moves out of the service area formed by the radio base station, the mobile radio terminal is moved even within the service area. There are cases where the terminal is shadowed, that is, the mobile wireless terminal passes through a tunnel or moves to the shadow of a building and the mobile wireless terminal temporarily moves to a place where radio waves do not reach.

Therefore, if the mobile radio terminal moves out of the service area when the line is disconnected, the probability of recovery of the line is low and it is often useless to try the reconnection operation. On the other hand, when the mobile wireless terminal moves to a shadowed place in the service area, the line is likely to be recovered, and the line is often recovered immediately when the reconnection operation is tried. Therefore, it is understood that the trial time for the reconnection operation of the line by the mobile radio terminal may be set based on the disconnection state of the line.

The control in the control unit 4 of the mobile radio terminal which estimates the situation at the time of disconnection of the line and tries the reconnection operation of the line based on the estimated condition will be described below.

Let RSSIdifN _N be the differential value of the RSSI at the time of disconnection of the line, then RSSIdifN _N
Is a negative value, the RSSI has dropped and the line has been disconnected. If the negative value is large, the RSSI level has dropped sharply immediately before the disconnection, and the line disconnection is temporary. It is estimated that the line was disconnected due to shadowing.

On the other hand, the absolute value of the RSSIdifN _N is relatively small, and the RSSI in the RSSI averaging processor 5 is
If the value of the I sample data is smaller than the predetermined value,
This indicates that the RSSI is gradually decreasing, and it is estimated that the mobile wireless terminal moved out of the service area of the wireless base station and the line was disconnected.

Therefore, if the disconnection of the line is due to shadowing, the control unit 4 judges that the line recovery will be performed immediately, and sets the trial time interval of reconnection of the line relatively short. There is. As a result, when the line is disconnected, the line can be quickly recovered by performing the line reconnection operation at a short trial time interval.

Further, the control unit 4 determines that when the disconnection of the line is due to the movement of the mobile radio terminal out of the service area of the radio base station,
Judging that it is difficult to recover the line, the time interval for reconnecting the line is set to be relatively long. As a result, when the line is disconnected, the line reconnection operation is performed at a long trial time interval, so that the wasteful line connection operation can be reduced, so that the battery consumption of the mobile radio terminal can be reduced. it can.

The sampling interval of the received signal strength in the RSSI averaging processing section 5 is not limited to every 20 msec, and may be several tens of msec. The number of times RSSI is averaged is not particularly limited, but is preferably several times.

The line reconnection trial time interval is a value that can speed up the line recovery when the line recovery is expected to be fast, and the battery consumption when the line recovery is expected to be slow. It may be set to a value to be reduced and is not limited.

For example, as a method of setting the trial time interval, a method of setting the trial time interval in a size inversely proportional to the size of the RSSIdifN _N which is the differential value of the RSSI differential processing unit 6 immediately before the line disconnection can be considered. In this case, the differential value RSSIdifN for estimating the line disconnection status immediately before the line disconnection
Since the line reconnection operation can be performed at the trial time interval corresponding to _N , the line recovery is appropriately performed according to the situation when the line is disconnected. Therefore, by reducing unnecessary line reconnection operations in situations where line recovery is unlikely,
It is possible to reduce the battery consumption of the mobile wireless terminal and to quickly restore the line in a situation where the line is likely to be restored.

In addition to the above-mentioned setting of the trial time interval, a plurality of threshold levels of different levels and time intervals corresponding to these threshold levels are stored in advance so that the RSSI differentiation processing unit 6 immediately before disconnection of the line. A method of comparing RSSIdifN _N which is a differential value with each of the above threshold levels and using the time interval corresponding to the threshold level at which the absolute value of the difference is within a predetermined value as the trial time interval of the reconnection operation of the line is is there.

If the average level of RSSI at the time of line disconnection is lower than the value (threshold level) corresponding to the receiving sensitivity in the wireless section 1 of the mobile wireless terminal,
There is also a method of setting the maximum time interval that can be set by the mobile radio terminal as the trial time interval without adopting the trial time interval based on the differential value by the SI differential processing unit 6. in this case,
If the received signal strength is unstable, such as at the periphery of the service area of the wireless base station, set the trial time interval of the line reconnection operation to the maximum setting value to obtain an unstable received signal strength condition. Since it is possible to reduce the number of unnecessary line reconnection operations associated with the intermittent line disconnection in the above, it is possible to reduce the battery consumption of the mobile wireless terminal.

[0037]

As described above, the mobile radio terminal according to the present invention communicates with the radio base station and reconnects the line at a predetermined trial time interval when the line is disconnected. In the above configuration, the time interval for reconnection of the line is adjusted according to the received signal strength immediately before the line is disconnected.

Therefore, for example, if the received signal strength immediately before the disconnection of the line is equal to or more than the predetermined value, it is determined that the wireless base station has been temporarily disconnected, and the reconnection attempt time interval is set to be shorter than the predetermined value. By shortening the line, it is possible to quickly restore the line in a situation where the line is likely to be recovered. If the reception strength immediately before the line is smaller than the predetermined value, it is determined that the mobile wireless terminal has moved out of the service area of the wireless base station and the line has been disconnected, and the reconnection trial time interval is lengthened to a predetermined value or more. Thus, it is possible to reduce the consumption of the battery due to the repeated reconnection operation in the situation where the line recovery is unlikely.

As described above, the mobile radio terminal of the invention of claim 2 is a mobile radio terminal which communicates with a radio base station and reconnects the line at a predetermined trial time interval when the line is disconnected. , A wireless unit that transmits and receives signals associated with communication,
A signal strength averaging processing unit that periodically averages the strength of the signal received by the wireless unit, and a signal strength differentiating processing unit that calculates a differential value that is a temporal change of the averaged received signal strength. , When the line is disconnected and the differential value of the received signal strength is a negative number or an absolute value greater than or equal to a predetermined value,
To reduce the time interval between line reconnection attempts, and to increase the time interval between line reconnection attempts when the differential value of the reception strength is a positive or absolute value smaller than a predetermined value, try time It is the structure provided with the control part which controls a space | interval.

Therefore, at the time when the line is disconnected, the control unit can estimate the disconnection state of the line based on the differential value of the signal strength differential processing unit immediately before the disconnection. By adjusting the trial time interval of line reconnection, the effect of being able to quickly recover the line while reducing battery consumption is achieved.

As described above, in the mobile radio terminal of the third aspect of the present invention, in addition to the configuration of the second aspect, the control section sets the trial time interval of line reconnection to a large differential value of the received signal strength. The configuration is so controlled as to be inversely proportional to the above.

Therefore, in addition to the effect of the configuration of claim 2, the line reconnection operation can be performed at the trial time interval corresponding to the differential value for estimating the line disconnection state immediately before the line disconnection. Is properly restored depending on the situation when the line is disconnected.

Therefore, by reducing the wasteful reconnection operation of the line in the situation where the line recovery is unlikely, the battery consumption of the mobile radio terminal is reduced and the line recovery is highly expected. The effect is that the line can be restored quickly.

As described above, in the mobile radio terminal of the invention of claim 4, in addition to the configuration of claim 2, the control section is such that the average value of the averaged received signal strength at the time of line disconnection is the radio section. If it is smaller than the reception sensitivity value in, the line reconnection trial time interval is set to the preset maximum value of the trial time interval for line reconnection.

Therefore, in addition to the effects of the configuration of claim 2, when the received signal strength is unstable, such as in the periphery of the service area of the radio base station, the trial time interval of the line reconnection operation is set. By maximizing the setting value, the number of unnecessary line reconnection operations that accompany intermittent line disconnections in an unstable received signal strength state can be reduced. This has the effect of reducing wear.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a mobile radio terminal according to an embodiment of the present invention.

[Explanation of symbols]

1 Radio | wireless part 4 Control part 5 RSSI averaging processing part (received signal strength averaging processing part) 6 RSSI differentiation processing part (received signal strength differentiation processing part)

Claims (4)

[Claims] 1. A mobile radio terminal which performs radio mobile communication with a radio base station and reconnects a communication line at a predetermined trial time interval when the communication line is disconnected. A mobile radio terminal characterized by being set according to the received signal strength immediately before the line is disconnected. 2. A mobile radio terminal that performs radio mobile communication with a radio base station and reconnects the communication line at a predetermined trial time interval when the communication line is disconnected, and transmits and receives signals to and from the radio base station. Wireless unit, a signal strength averaging unit that periodically averages the strength of signals received by the wireless unit, and a differential value that indicates the temporal change rate of the averaged received signal strength. When the absolute value of the differential value of the received signal strength is greater than or equal to a predetermined value at the time when the line is disconnected from the signal strength differentiation processing unit, the trial time interval of line reconnection is shortened, and the received signal is A mobile radio terminal, comprising: a control unit that controls the trial time interval so that the trial time interval for line reconnection becomes longer when the absolute value of the differential value of the strength is smaller than a predetermined value. 3. The mobile radio terminal according to claim 2, wherein the control unit controls the time interval for reconnection of the line so as to be inversely proportional to the magnitude of the differential value of the received signal strength. . 4. The control unit presets a trial time interval for line reconnection if the average value of the averaged received signal strengths at the time of line disconnection is smaller than the reception sensitivity value in the radio unit. The mobile radio terminal according to claim 2, wherein the maximum value of the trial time interval for reestablishing the established line is set.