JP2000174694A - Radio communication equipment, mobile communication system, mobile communication terminal equipment and base station device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more appropriately judge the propriety of communication. SOLUTION: In a communication quality detection unit 14, an RSSI (reception electric field strength) identification circuit 14a identifies an RSSI value detected in an RSSI detection part 12d at each detection time t0 and obtains a short time communication quality value. A low quality time ratio calculation circuit 14b obtains a time ratio occupied within averaging time T1 by a period where the short time communication quality value is below a threshold L1. Then, a communication quality judgement circuit 14e judges whether or not it is communication quality capable of the communication by comparing the time ratio obtained in the low quality time ratio calculation circuit 14b with a connection limit value C1. Then, a judged result in the communication quality judgement circuit 14e and the time ratio obtained in the low quality time ratio calculation circuit 14b are used for the judgement of the permission of call setting, the judgement of the necessity of call disconnection or communication quality display by a mobile terminal control unit 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus, a mobile communication system, a mobile communication terminal apparatus and a base station apparatus for performing communication via a radio line, and more particularly to a communication quality evaluation function.

[0002]

2. Description of the Related Art In mobile communication using radio waves, communication quality varies greatly depending on the reception level of radio waves and interference waves from other sources. When the communication quality is poor, the communication may be extremely difficult, and in the worst case, the communication itself may be practically impossible.

[0003] Therefore, at the start of communication or during communication, it is necessary to measure and detect the communication quality to monitor whether the quality is communicable. It is also necessary to display to the user whether the communication quality is good.

In mobile communications, the reception level fluctuates instantaneously. Therefore, it is necessary to evaluate communication quality not as instantaneous quality but as quality averaged over a certain period of time.

[0005] When the moving speed is high, such as in a car telephone, the reception level generally fluctuates according to the Rayleigh distribution having a high fluctuation speed, and the average or median of the Rayleigh fluctuations within a certain period of time. Is detected as the communication quality.

When the mobile phone is stopped or the moving speed is slow, as in a mobile phone, the reception level fluctuates slowly.
The communication quality is determined by detecting an average value or a value equivalent thereto within a certain period of time.

However, for example, when data transmission or facsimile transmission is performed in a communication mode in which retransmission control or the like is not performed, a short-time drop in communication quality appears as a code error or image disturbance, and the entire communication is invalidated. In some cases. That is, an instantaneous drop in communication quality almost completely defines the actual communication quality.

[0008] For these reasons, the communication quality detected as described above cannot be said to be an appropriate evaluation of the actual communication quality.

[0009] Further, when a signal is divided into relatively short packets as in packet communication and communication is performed in retransmission control for confirming whether or not transmission has been completed with a transmission partner on a packet basis, instantaneous deterioration of communication quality occurs. Even if there is, only a transmission error occurs in at most a small number of packets, and this error can be recovered by retransmission control or the like. That is, the drop in quality is not so much a problem, but rather the quality is determined by the number of good quality parts (time).

As described above, the criteria for evaluating the communication quality differ depending on the communication content and the communication mode. However, conventionally, only a uniform quality evaluation can be performed regardless of the communication content and the communication mode. In this regard, an appropriate evaluation has not been made.

[0011] The detected communication quality is generally displayed to notify the user. Then, the user determines whether or not communication is possible based on the displayed communication quality, and performs communication when it is determined that communication is possible.

However, since the communication quality detected as described above does not properly evaluate the actual communication quality, it is determined that the user cannot communicate even though communication is actually possible. There is a possibility that the user may try to start communication even though communication is actually difficult.

[0013] In addition, a situation may occur in which circuit-switched communication is impossible, but packet-switched communication is possible, but it has been very difficult for a user to recognize such a situation in the past.

If the detected communication quality is inferior and call connection rejection or forced disconnection of a connected call is performed, the call connection is rejected even though communication is actually possible. Or the connected call may be forcibly disconnected, or on the contrary, the connection may be attempted or the connected call may be unnecessarily continued when communication is actually difficult. was there. Note that in a situation where call connection is rejected or a connected call is forcibly disconnected while communication is actually possible, an available communication channel is not used. It also comes down. Conversely, even when the connected call is unnecessarily continued even though communication is actually difficult, the channel that should be allocated to other users and used by the main unit is wasted. This also results in a decrease in channel use efficiency.

[0015]

As described above, conventionally,
Since the communication quality is an instantaneous reception level or an average value of the reception levels within a certain period of time, the communication quality cannot be evaluated properly.

Further, in an apparatus corresponding to a plurality of communication types having different communication quality evaluation standards, only a uniform communication quality can be evaluated regardless of the communication type, and the communication quality can be appropriately evaluated. There was a problem that it could not be done.

The present invention has been made in view of such circumstances, and a first object of the present invention is to make it possible to more appropriately determine whether communication is possible.

A second object of the present invention is to make it possible to more appropriately determine whether communication is possible and individually for each of a plurality of communication types.

[0019]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention relates to a wireless communication device such as a mobile communication terminal device for communicating with another wireless communication device via a wireless line. To obtain a predetermined communication quality value such as an RSSI value related to the communication quality of the radio line, for example, R
Communication quality value acquisition means such as an SSI detection unit, and communication quality values acquired by the communication quality value acquisition means, or communication quality values acquired by the communication quality value acquisition means by communication quality value recognition means such as an RSSI identification circuit. The period during which the communication quality value recognized within a predetermined recognition time shorter than the change period of the value and shorter than the averaging time is below or above a predetermined threshold is during the predetermined averaging time. A time rate measuring means such as a low quality time rate calculation circuit or a high quality time rate calculation circuit for measuring an occupied time rate is provided.

By taking such measures, a time rate at which the communication quality value is degraded so as to fall below a predetermined threshold value and a time rate at which the communication quality value exceeds the predetermined threshold value and which is sufficient can be obtained. Therefore, by monitoring the time rate, it is possible to appropriately determine whether or not the communication quality is such that communication can be performed normally.

The present invention further comprises a call setting rejection means, and rejects the call setting if the time rate measured by the time rate measuring means and a predetermined reference value have a predetermined relationship at the time of request for call setting. It was decided to.

[0022] By taking such means, if it is determined from the time rate measured by the time rate measuring means that the communication quality is poor, the call setting is rejected.

The present invention further comprises a call disconnecting means for forcibly disconnecting the call if the time rate measured by the time rate measuring means and a predetermined reference value have a predetermined relationship during communication. And

[0024] By taking such means, if it is determined that the communication quality is inferior from the time rate measured by the time rate measuring means, the set call is forcibly disconnected.

The present invention further comprises display means comprising a quality display control means and a display unit, wherein predetermined information relating to the time rate measured by the time rate measurement means (for example, the time measured by the time rate measurement means) (Ratio of the ratio to a predetermined reference value).

By taking such means, the time rate measured by the time rate measuring means is notified to the user by displaying predetermined information relating to the time rate.

According to the present invention, in order to attain the second object, the threshold value, the averaging time and the reference value are set as follows:
For example, a setting is made in accordance with each of a plurality of communication types such as circuit-switched communication and packet-switched communication, and a communication type to be executed is used.

By adopting such means, for each of the plurality of communication types, a threshold, an averaging time, and a reference value corresponding to each characteristic are used to calculate the time rate and the communication quality for each communication type. Is determined.

The present invention further comprises a display means comprising a quality display control means and a display unit, wherein, during standby, predetermined information relating to the time rates measured for each of the plurality of communication types by the time rate measuring means. (For example, the ratio of the time rate measured by the time rate measuring means to a predetermined reference value) is displayed in an identifiable manner, and during communication, the time rate is measured by the time rate measuring means for the type of communication. Predetermined information on the time rate is displayed.

By taking such means, during standby, predetermined information relating to the time rate measured by the time rate measuring means for each of the plurality of communication types is displayed in an identifiable manner. The user is notified of the time rate measured for the type. In the middle of the communication, predetermined information about the time rate measured by the time rate measuring means for the type of communication is displayed, and the user is notified of the time rate measured for the type of communication being executed.

Further, according to the present invention, by connecting a mobile communication terminal device to a base station device accommodated in a mobile communication network via a radio line, the mobile communication terminal device communicates via the mobile communication network. In a mobile communication system capable of performing the communication, the mobile communication terminal device has a communication quality value obtaining unit such as an RSSI detection unit for obtaining a predetermined communication quality value such as an RSSI value related to the communication quality of the wireless channel. For example, a low quality time rate calculation circuit or a high quality time rate calculation circuit that measures a time ratio of a period in which the communication quality value obtained by the communication quality value obtaining means is below or above a predetermined threshold during a predetermined averaging time is used. A time rate measuring means such as a quality time rate calculating circuit, and a request for setting up a call to the base station apparatus, a predetermined time rate related to the time rate measured by the time rate measuring means. And a time rate notifying means for notifying the base station apparatus of a call report, and determining whether the call setting is possible based on the information notified to the base station apparatus by the time rate notifying means of the mobile communication terminal apparatus. A call setting rejection means for rejecting the call setting when it is determined that the call setting is inappropriate is provided.

By taking such means, in the mobile communication terminal device, the time rate at which the communication quality value is degraded so as to fall below the predetermined threshold value or the communication quality value exceeding the predetermined threshold value is sufficient. A certain time rate is obtained, and information indicating the time rate is notified to the base station apparatus at the time of a call connection request. Then, the base station apparatus determines whether or not the call setting is possible based on the notified information, and rejects the call setting if the call setting is inappropriate.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a main configuration of a mobile communication terminal device configured by applying the wireless communication device of the present invention.

This mobile communication terminal device has an antenna 11,
It has a communication unit 12, a signal processing unit 13, a communication quality detection unit 14, an operation unit 15, a display unit 16, and a mobile terminal control unit 17.

The communication unit 12 is a duplexer (DU)
P) 12a, receiver 12b, transmitter 12c and RSS
It has an I detection unit 12d.

The radio signal received by the antenna 11 is separated by the duplexer 12a, input to the receiver 12b, and demodulated. The signal demodulated by the receiver 12b is input to the signal processing unit 13.

The signal processing unit 13 is a well-known device for implementing any of various communication functions such as a telephone function, an interface function of a facsimile terminal, and an interface function of a data communication terminal such as a personal computer. Perform processing.

The signal output from the signal processing unit 13 is supplied to a transmitter 12c and modulated to be a radio signal. The wireless signal is supplied to the antenna 11 via the duplexer 12a and transmitted.

In the RSSI detector 12d, the receiver 1
The reception electric field strength (RSSI) of the radio carrier signal in the radio signal received in 2b is detected, and the detected value is provided to the communication quality detection unit 14.

The communication quality detection unit 14 includes an RSSI identification circuit 14a, a low quality time rate calculation circuit 14b, a high quality time rate calculation circuit 14c, a timing circuit 14d, communication quality determination circuits 14e and 14f, and selectors 14g and 14h.
have.

RS provided from RSSI detector 12d
The SI is input to the RSSI identification circuit 14a. RSS
The I identification circuit 14a outputs the signal R provided from the RSSI detector 12d at an arbitrary timing within a predetermined detection time t0.
Identify the value of SSI. And the RSSI identification circuit 14a
Calculates the low quality time rate calculation circuit 14b
And the high quality time rate calculation circuit 14c.

The low-quality time rate calculation circuit 14b uses the RSSI
The RSSI value identified by the identification circuit 14a is a predetermined threshold L
The time rate during which the period less than 1 occupies in the predetermined averaging time T1 is determined as the low quality time rate. The low quality time rate obtained by the low quality time rate calculation circuit 14b is provided to a communication quality determination circuit 14e,
h to a first input IN1.

The high-quality time rate calculation circuit 14c uses the RSSI
The RSSI value identified by the identification circuit 14a is a predetermined threshold L
The time rate occupied by the period exceeding 2 in the predetermined averaging time T2 is determined as a high quality time rate. The high quality time rate obtained by the high quality time rate calculation circuit 14c is provided to the communication quality determination circuit 14f and the selector 14
h to a second input IN2.

The timing circuit 14d calculates the averaging time T1
Is given to the low quality time rate calculation circuit 14b, and a timing signal showing the averaging time T2 is given to the high quality time rate calculation circuit 14c.

The communication quality judging circuit 14e calculates the low quality time rate given from the low quality time rate calculation circuit 14b.
The quality of the communication quality regarding the circuit-switched communication is determined. Then, the communication quality determination circuit 14e provides information indicating the determination result to the first input IN1 of the selector 14g.

The communication quality judging circuit 14f calculates a high quality time rate based on the high quality time rate given from the high quality time rate calculating circuit 14c.
The communication quality of the packet switching communication is determined.
Then, the communication quality determination circuit 14f provides information indicating the determination result to the second input IN2 of the selector 14g.

Under the control of the mobile terminal control unit 17, the selectors 14g and 14h select either the input to the first input IN1 or the input to the second input IN2 and give the selected input to the mobile terminal control unit 17. . The selectors 14g and 14h are linked and select the first input IN1 or the second input IN2 at the same time.

The operation unit 15 includes, for example, a group of keys and a touch panel, and accepts various instruction inputs to the mobile terminal control unit 17 by the user.

The display unit 16 includes, for example, a liquid crystal display, and performs display for informing various kinds of information to the user under the control of the mobile terminal control unit 17.

The mobile terminal control unit 17 controls the operation of the communication unit 12 and the signal processing unit 13, and realizes the operation as a mobile communication terminal by exchanging control data with the base station.

The mobile terminal control unit 17 is mainly composed of, for example, a microcomputer, and realizes various control means by software processing. The control means of the mobile terminal control unit 17 includes, in addition to well-known general means such as designation of a transmission / reception frequency for the receiver 12b and the transmitter 12c and control of call connection, call setting rejection. Means 17a, call disconnecting means 17b and quality display control means 17c.

Here, the call setting rejecting means 17a selects the selectors 14g and 14h according to which of the circuit switching communication and the packet switching communication is requested at the time of the call setting request.
After receiving the communication quality determination result output from the selector 14g, if the communication quality is determined to be poor, the call connection is rejected.

The call disconnecting means 17b controls the selectors 14g and 14h in accordance with which of the circuit switching communication and the packet switching communication is being performed during the communication, and then determines the communication quality judgment result output from the selector 14g. Receiving
If it is determined that the communication quality is poor, the call in communication is forcibly disconnected.

The quality display control means 17c calculates the ratio between the low quality time rate calculated by the low quality time rate calculation circuit 14b and the connection limit value C1 and the high quality time rate calculated by the high quality time rate calculation circuit 14c. An image indicating the ratio between the rate and the connection limit value C2 is displayed on the display unit 16.

Next, the operation of the mobile communication terminal configured as described above will be described.

First, the communication quality detecting unit 14 determines the quality of the communication quality as follows.

That is, in the communication quality detection unit 14, first, the RSSI detection unit 12
As shown in FIG. 2, the RSSI value (instantaneous value) detected at d is a short-time communication quality value I for each predetermined detection time t0.
(I1, I2, I3, I4...).

As the short-time communication quality value I, a value obtained by integrating the RSSI value given from the RSSI detection unit 12d within the detection time t0 is adopted, or a certain timing point within the detection time t0 or within the detection time t0. The RSSI value given from the RSSI detector 12d at an arbitrary timing may be adopted.

The detection time t0 is determined by the RSSI detector 12
d is set longer than the change period of the RSSI value output. Further, the detection time t0 is desirably set to a value shorter than the fading pitch of the received signal. For example, in the case of a car phone or a mobile phone, several ms is appropriate.

Next, in the low quality time rate calculation circuit 14b, each of the short-time communication quality values I is compared with a predetermined threshold L1 for circuit-switched communication as shown in FIG.
Time rate (low quality time rate) occupied within a predetermined averaging time T1 during a period in which the short-time communication quality value I is less than the threshold L1
Find τ1.

At the same time, the high-quality time rate calculating circuit 14c compares each of the short-time communication quality values I with a predetermined threshold L2 for packet-switched communication as shown in FIG. A time rate (high quality time rate) τ2 occupied within a predetermined averaging time T2 during a period in which I exceeds the threshold L2 is determined.

Next, the communication quality determination circuit 14e determines whether the communication quality is good based on whether the low quality time rate τ1 is equal to or more than the connection limit value C1 as a predetermined reference value. . Here, the averaging time T1 is set to a time (for example, several seconds to several tens of seconds) at which a human can perceive the quality of the voice, and the threshold L1 is such that a considerable amount of noise is mixed in the voice or the voice signal is The quality level at the break limit and the connection limit value C1 are set to several percent or less. Accordingly, the result of the determination by the communication quality determining circuit 14e is a result of determining whether or not the communication quality is good for making a voice call in the circuit-switched communication.

At the same time, the communication quality determination circuit 14f determines whether the communication quality is good based on whether the high quality time rate τ2 is equal to or less than a connection limit value C2 as a predetermined reference value. Here, the averaging time T2 is set to several tens of times or more the packet length, the threshold value L2 is set to a limit quality level that causes an uncorrectable error in the packet, and the connection limit value C2 is set to several tens% or more. Therefore, the result of the determination by the communication quality determining circuit 14f is a result of determining whether or not the communication quality is good for performing the packet switching communication.

On the other hand, if a call connection request is made by, for example, a predetermined instruction operation on the operation unit 15 in the standby state, the mobile terminal control unit 17 executes a call connection process as shown in FIG.

In this call connection processing, the mobile terminal control unit 17 first determines whether the type of the requested call is circuit-switched communication (step ST1).

If the type of call is circuit-switched communication, the mobile terminal control unit 17 selects the selector 14g, 1
4h is set to the first input IN1 side (step ST
2). However, if the call type is packet-switched communication, the mobile terminal control unit 17 selects the selectors 14g, 14g.
h is set to the second input IN2 side (step ST3).

Subsequently, the mobile terminal control unit 17 obtains the communication quality judgment result output from the selector 14g (step ST4). That is, when the type of the call is the circuit-switched communication, the result of the determination by the communication quality determination circuit 14e, that is, the result of the determination as to whether or not the communication quality is good for making a voice call in the circuit-switched communication is obtained. I do. If the call type is packet-switched communication, the result of the determination by the communication quality determining circuit 14f, that is, the result of determining whether the communication quality is good for performing packet-switched communication, is obtained.

Then, the mobile terminal control unit 17 determines whether or not the obtained communication quality determination result indicates that the communication quality is good (step ST5), and it is determined that the communication quality is good. Only when there is, the call connection procedure is executed (step ST6). If it is determined that the communication quality is poor, the mobile terminal control unit 1
7 terminates the call connection processing without executing the call connection procedure.

When the call is connected, the mobile terminal control unit 17 repeatedly executes a call disconnection process as shown in FIG. 6 at a predetermined timing.

In this call disconnection process, the mobile terminal control unit 17 first determines whether the type of communication being executed is circuit-switched communication (step ST11).

If the type of communication is circuit-switched communication, the mobile terminal control unit 17 selects the selector 14g,
14h is set to the first input IN1 side (step ST1).
2). However, if the type of communication is packet-switched communication, the mobile terminal control unit 17 selects the selector 14g, 1
4h is set on the second input IN2 side (step ST1).
3).

Subsequently, the mobile terminal control unit 17 acquires the communication quality judgment result output from the selector 14g (step ST14). That is, when the type of communication is circuit-switched communication, the result of determination by the communication quality determination circuit 14e, that is, the result of determination as to whether the communication quality is good for making a voice call in circuit-switched communication, is obtained. I do. If the call type is packet-switched communication, the result of the determination by the communication quality determining circuit 14f, that is, the result of determining whether the communication quality is good for performing packet-switched communication, is obtained.

Then, the mobile terminal control unit 17 determines whether or not the obtained communication quality determination result indicates that the communication quality is inferior (step ST15), and it is determined that the communication quality is inferior. Only when the call is present, the call disconnection procedure (step ST16) is executed to forcibly disconnect the call. If the communication quality is determined to be good,
The mobile terminal control unit 17 ends the call connection processing without executing the call disconnection procedure, and continues the communication.

By the way, the mobile terminal control unit 17 repeatedly executes the communication quality display processing as shown in FIG. 7 at a predetermined timing regardless of whether the mobile terminal is in the standby state or in the communication.

In the communication quality display processing, mobile terminal control unit 17 first determines whether or not communication is being performed (step ST21).

Here, if communication is not being performed, that is, if the mobile terminal is in a standby state, the mobile terminal control unit 1
7 sets the selectors 14g and 14h to the first input IN1 side (step ST22), and obtains the output of the selector 14h, that is, the low quality time rate τ1 obtained by the low quality time rate calculation circuit 14b (step ST22). ST2
3). Then, the mobile terminal control unit 17 obtains the ratio of the low quality time rate τ1 to the connection limit value C1, and sets this as the circuit switching communication quality (step ST24).

Subsequently, the mobile terminal control unit 17 sets the selectors 14g and 14h to the second input IN2 side (step ST25), and outputs the output of the selector 14h, that is, the high level obtained by the high quality time rate calculation circuit 14c. The quality time rate τ2 is obtained (step ST26). Then, the mobile terminal control unit 17 obtains the ratio of the high quality time rate τ2 to the connection limit value C2, and sets this as the packet switching communication quality (step ST27).

Finally, the mobile terminal control unit 17 displays the circuit-switched communication quality calculated in step ST24 and the packet-switched communication quality calculated in step ST27, as shown by reference numerals 81 and 82 in FIG. Causes the display unit 16 to display them so that they can be identified (step ST28).

On the other hand, if the communication has been performed at the start of the communication quality display processing, mobile terminal control unit 17 determines whether or not the communication is being performed by circuit switching communication (step ST29). .

Here, if circuit-switched communication is being performed, the mobile terminal control unit 17 selects the selector 14g,
14h is set on the first input IN1 side (step ST3).
0), the output of the selector 14h, that is, the low quality time rate τ obtained by the low quality time rate calculation circuit 14b.
1 is obtained (step ST31). Then, the mobile terminal control unit 17 obtains a ratio of the low quality time rate τ1 to the connection limit value C1, and displays an image corresponding to the value on the display unit 16 (step ST32).

On the other hand, if it is not circuit switching communication that is being performed, that is, if packet switching communication is being performed, the mobile terminal control unit 17 sets the selectors 14g and 14h to the second input IN2. (Step ST33), and obtains the output of the selector 14h, that is, the high quality time rate τ2 obtained by the high quality time rate calculation circuit 14c (step ST34). Then, the mobile terminal control unit 17 obtains a ratio of the high quality time rate τ2 to the connection limit value C2, and displays an image corresponding to the value on the display unit 16 (step ST35).

As for the circuit-switched communication, the quality is better as the value of the connection limit value C1 is larger than the low quality time rate τ1, and the quality is worse as the value is smaller. Conversely, with regard to packet-switched communication, the higher the value of the high quality time rate τ2 is greater than the connection limit value C2, the better the quality is, and the smaller the value, the worse the quality is. Therefore, such a state is displayed in an easy-to-understand image.

As described above, according to the present embodiment, in the averaging times T1 and T2, the period during which the RSSI value falls below a certain level (threshold L1) or the certain level (threshold L2). Since the communication quality is to be evaluated based on the time rate of a period during which the quality is higher than the communication quality, the communication quality can be appropriately evaluated in accordance with the difficulty of actual communication.

In the present embodiment, if the communication quality is inferior based on the communication quality appropriately evaluated as described above, the call setting is rejected or the set call is forcibly disconnected. It is possible to prevent the line from being occupied unnecessarily, and it is possible to reliably use available channels, thereby improving channel use efficiency.

In this embodiment, the averaging time, the threshold value, and the connection limit value are set to different values for circuit-switched communication and packet-switched communication, and different evaluations are performed for each communication type. Therefore, appropriate evaluation according to the characteristics of each communication type can be performed. Therefore, it is possible to accurately determine a situation such as "circuit-switched communication is impossible, but packet-switched communication can be performed", and based on this, communication can be performed efficiently.

In the present embodiment, both the communication quality relating to the circuit switching communication and the communication quality relating to the packet switching communication are displayed in a standby state so that the user can identify the communication quality. Quality can be reliably recognized.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 9 is a block diagram showing a main configuration of the mobile communication system according to the present embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this figure, the reference numeral 1 denotes a mobile communication terminal device, and the reference numeral 2 denotes a base station device.

The mobile communication terminal device 1 has an antenna 11, a communication unit 12, a signal processing unit 13, a communication quality detection unit 14, an operation unit 15, a display unit 16, and a mobile terminal control unit 18.

That is, the mobile communication terminal device 1
A mobile terminal control unit 18 is provided instead of the mobile terminal control unit 17 in the mobile communication terminal device of the embodiment.

The mobile terminal control unit 18 controls the operation of the communication unit 12 and the signal processing unit 13, and realizes the operation as a mobile communication terminal by exchanging control data with the base station.

The mobile terminal control unit 18 is mainly composed of a microcomputer, for example, and realizes various control means by software processing. The control means included in the mobile terminal control unit 18 includes well-known general means such as designation of transmission / reception frequencies for the receiver 12b and the transmitter 12c, and call connection control, and the first embodiment. In addition to the call disconnecting means 17b and the quality display controlling means 17c included in the mobile terminal control unit 17 in the mobile communication terminal device of the embodiment, the mobile communication terminal apparatus has a time rate notifying means 18a.

The time rate notifying means 18a controls the selectors 14g and 14h according to which of the circuit switching communication and the packet switching communication is requested at the time of the call setting request, and then outputs from the selector 14h. It receives the low quality time rate or the high quality time rate, and notifies the base station apparatus 2 of it.

On the other hand, the base station device 2 has an antenna 21, a communication unit 22, a signal processing unit 23, and a base station control unit 24.

The communication unit 22 has a well-known configuration including, for example, a transmitter and a receiver, and performs various processes for performing wireless communication with the mobile communication terminal device 1.

The signal processing unit 23 transmits and receives traffic data transmitted and received by the mobile communication terminal 1 and control data transmitted and received by the base station control unit 24 to and from a control station or the like at the center of the mobile communication network. .

The base station control unit 24 controls the operation of the communication unit 22 and the signal processing unit 23, and exchanges control data with the mobile communication terminal 1 and the control station to thereby control the mobile communication terminal 1 Communication is possible.

The base station control unit 24 is mainly composed of a microcomputer, for example, and realizes various control means by software processing. The control means of the base station control unit 24 includes a call connection rejection means 24a in addition to the well-known general means in the base station apparatus.

The call connection rejection means 24a determines the communication quality of the mobile communication terminal 1 based on the time rate notified together with the call setting request from the mobile communication terminal 1, and if the communication quality is poor, Performs processing to reject the call connection.

Next, the operation of the mobile communication system configured as described above will be described.

The mobile terminal control unit 18 executes a call connection process as shown in FIG. 10 when a call connection request is made by, for example, a predetermined instruction operation on the operation unit 15 in the standby state.

In this call connection processing, the mobile terminal control unit 18 first determines whether or not the type of the requested call is circuit-switched communication (step ST41).

If the type of call is circuit-switched communication, the mobile terminal control unit 18 selects the selector 14g, 1
4h is set to the first input IN1 side (step ST4).
2). However, if the call type is packet-switched communication, the mobile terminal control unit 18 selects the selectors 14g, 14g.
h is set to the second input IN2 side (step ST4).
3).

Subsequently, mobile terminal control unit 18 obtains the time rate (low quality time rate or high quality time rate) output from selector 14h (step ST44). That is, when the type of call is circuit-switched communication, the low quality time rate calculated by the low quality time rate calculation circuit 14b is obtained. If the call type is packet-switched communication, the high-quality time rate obtained by the high-quality time rate calculation circuit 14c is obtained.

[0107] Then, the mobile terminal control unit 18 requests the base station apparatus 2 to set up a call and notifies the base station apparatus 2 of the time rate obtained in step ST44 (step ST44).
45).

The base station control unit 24 starts a call connection process as shown in FIG. 10 in response to a request for call setting from the mobile communication terminal device 1.

In the call connection process, the base station control unit 24 first determines whether or not the type of the requested call is circuit-switched communication (step ST51).

If the type of call is circuit-switched communication, the base station control unit 24 determines whether or not the notified time rate (low quality time rate) is equal to or more than the connection limit value C1 ( Step ST52). However, if the type of call is packet-switched communication, the base station control unit 24 determines whether the notified time rate (high quality time rate) is equal to or less than the connection limit value C2 (step ST53). .

If the notified time rate is not less than connection limit value C1 or not more than connection limit value C2, base station control unit 24 notifies mobile communication terminal device 1 of the start of the call connection procedure (step (ST54) Then, a call connection procedure is executed (step ST55).

On the other hand, if the notified time rate is not equal to or greater than the connection limit value C1 or is not equal to or less than the connection limit value C2, the base station control unit 24 rejects the call connection with the mobile communication terminal. 1 is notified (step ST56).

After requesting the call setup in step ST45, the mobile terminal control unit 18 determines whether the call connection is rejected (step ST46).

When the start of the call connection procedure is notified, the mobile terminal control unit 18 executes the call connection procedure (step ST47). However, when the rejection of the call connection is notified, the mobile terminal control unit 18 ends the call connection process without executing the call connection procedure.

Thus, according to the present embodiment, even in a system in which all call connection control is performed under the initiative of the base station apparatus 2, the RSSI value is at a certain level (threshold L1) in the averaging times T1 and T2. Can be rejected based on the time rate of the period in which the quality is lower than the threshold value or the period in which the quality exceeds a certain level (threshold L2) and the sufficient quality is maintained.

The present invention is not limited to the above embodiments. For example, in each of the above embodiments, the low quality time rate or the high quality time rate is obtained from the change state of the RSSI value, but various types that can be a measure of the quality of the received signal can be applied. For example, when the signal level and the interference level can be detected as in the CDMA system, the ratio of the signal power to the interference wave power can be adopted. Furthermore, when an error control method is adopted and the presence or absence of an error of a frame or the number of error bits is known, the presence or absence of a frame error or the number of error bits can be adopted as a measure of quality.

In a system employing so-called transmission power control for controlling the reception level at the partner station to be a constant value, the quality as seen at the reception level is almost the same as long as the transmission power control is fully functioning. It is constant. If the quality deteriorates at this time, the transmission power control is incomplete due to the restriction on the upper limit of the transmission power of the partner station, and the required reception level is not reached. In such a system, the ratio of the maximum transmittable power to the current transmit power can be considered as a margin for potential quality degradation. Therefore, the present invention can be applied by regarding the ratio between the maximum transmittable power and the current transmit power as the communication quality.

In the above embodiments, the low quality time rate and the high quality time rate are obtained by using the short communication quality value I obtained by identifying the RSSI value for each detection time t0.
The I value may be directly compared with the threshold, and the time when the RSSI value is below or above the threshold may be posted to determine the low quality time rate or the high quality time rate.

Further, the averaging time T1, T2, the threshold L1,
L2 and the connection limit values C1 and C2 may be set to different values depending on whether quality for use in call connection processing is determined or quality for use in call disconnection processing. good. For example, when determining the quality for use in the call disconnection processing, L1 may be changed to a quality level at which noise is so great that speech cannot be heard, and C1 and C2 may be changed to a time rate of about 50%. Conceivable.

In each of the above embodiments, the time rate (low quality time rate) τ1 occupied in the predetermined averaging time T1 during the period in which the short-time communication quality value I is less than the threshold L1 is determined for circuit-switched communication. Although it is determined, the time ratio in which the period during which the short-time communication quality value I exceeds the threshold L1 within the predetermined averaging time T1 can be used for quality determination. Similarly, in each of the above embodiments, for packet-switched communication, a time rate (high quality time rate) τ2 occupied within a predetermined averaging time T2 during a period in which the short-time communication quality value I exceeds the threshold L2 is determined. But the short-time communication quality value I is equal to the threshold L
Even a time ratio in which the period less than 2 occupies within the predetermined averaging time T2 can be used for quality determination. However, in these cases, the connection limit values C1 and C2 need to be changed to corresponding values, and the magnitude determination needs to be reversed.

In each of the above embodiments, the communication quality for each of the circuit-switched communication and the packet-switched communication is determined. However, the target communication type is not limited to the circuit-switched communication and the packet-switched communication. . Alternatively, only the determination of the communication quality for a single communication type may be performed.

The averaging time, the threshold value, and the connection limit value may be prepared for three or more communication types, and the communication quality for three or more communication types may be determined. For example, even in the case of circuit-switched communication, it is conceivable to use different communication types for voice communication and data communication. In other words, in this case, as long as the degree of deterioration and frequency of the voice call are not so severe, it is possible to listen again and the communication itself may be established, but in the case of data communication and not performing error retransmission. Considering such circumstances, it is necessary to determine the communication quality using different averaging times, thresholds and connection limit values, since relatively little quality degradation may be a major problem. You do it.

The communication quality value such as the RSSI value may be obtained by receiving a notification from a partner device such as a base station device. For example, a notification of a reception level of a signal transmitted by the own station at a partner device can be received, and this can be used as a communication quality value.

[0124] The determination result of the communication quality can be used for other purposes such as determination of necessity of handover.

Also, the communication quality during communication may be monitored by the base station apparatus, and the call may be forcibly disconnected when the quality is low.

In the second embodiment, the mobile communication terminal apparatus 1 notifies the base station apparatus 2 of the low quality time rate or the high quality time rate. C1 ratio, high quality time rate and connection limit value C
A ratio of 2, or a result of determining the quality of communication may be notified.

In addition, various modifications can be made without departing from the gist of the present invention.

[0128]

According to the present invention, in a wireless communication apparatus for communicating with another wireless communication apparatus via a wireless line, a communication quality value acquisition for obtaining a predetermined communication quality value relating to the communication quality of the wireless line. Means, the communication quality value acquired by the communication quality value acquisition means, or longer than the change cycle of the communication quality value acquired by the communication quality value acquisition means by the communication quality value recognition means, and more than the averaging time And a time rate measuring means for measuring a time rate during which the communication quality value recognized within the short predetermined recognition time is below or above the predetermined threshold during the predetermined averaging time. Since a time rate at which the communication quality value is degraded so as to be lower than a predetermined threshold value and a time rate at which the communication quality is higher than the predetermined threshold value are sufficient, the time rate is monitored. It makes the mobile communication terminal device possible to determine the communication propriety better.

Further, according to the present invention, there is provided a call setting rejecting means, and when the time rate measured by the time rate measuring means and a predetermined reference value have a predetermined relationship at the time of request for call setting, the call setting is rejected. When the communication rate can be determined to be inferior from the time rate measured by the time rate measuring means, the call setting is rejected, and as a result, unnecessary calls are rejected. A mobile communication terminal device that prevents setting and prevents call setting from being unnecessarily rejected and that can improve channel use efficiency.

Further, according to the present invention, there is provided a call disconnecting means,
During the communication, if the time rate measured by the time rate measuring means and a predetermined reference value have a predetermined relationship, the call is forcibly disconnected, so the time measured by the time rate measuring means If it is determined from the rate that the communication quality is inferior, the set call is forcibly disconnected. As a result, the call is prevented from continuing unnecessarily and the call setting is disconnected. Is not performed more than necessary, and a mobile communication terminal device capable of improving channel use efficiency is obtained.

Further, according to the present invention, there is provided display means comprising a quality display control means and a display unit, wherein predetermined information relating to the time rate measured by the time rate measuring means (for example, the information measured by the time rate measuring means). Ratio of the calculated time rate to a predetermined reference value), the time rate measured by the time rate measuring means is notified to the user by displaying predetermined information relating to the time rate,
The mobile communication terminal device allows the user to appropriately recognize the communication quality.

According to the present invention, the threshold value, the averaging time, and the reference value are set in accordance with each of a plurality of communication types such as, for example, circuit-switched communication and packet-switched communication. Therefore, for each of a plurality of communication types, a threshold, an averaging time, and a reference value corresponding to each characteristic are used to calculate a time rate and a communication quality for each communication type. Pass / fail is determined, and as a result, the mobile communication terminal device can more appropriately determine whether communication is possible and individually determine each of a plurality of communication types.

Further, according to the present invention, display means is provided, and during standby, predetermined information on the time rate measured by the time rate measuring means for each of the plurality of communication types (for example, the time rate measurement The ratio of the time rate measured by the means to the predetermined reference value) is identifiably displayed. During communication, predetermined information on the time rate measured by the time rate measuring means for the type of communication is displayed. Since the information is displayed, during standby, predetermined information on the time rate measured by the time rate measuring means for each of the plurality of communication types is displayed in an identifiable manner, so that the measurement for each communication type is performed. The user can recognize the performed time rate, and during the communication, the time rate measurement unit measures the type of the communication. Predetermined information is displayed with respect to time rate, the measured time constant with respect to communication type running user moves a communication terminal apparatus that can reliably recognize.

Further, according to the present invention, the mobile communication terminal device is connected to the base station device accommodated in the mobile communication network via a radio line, so that the mobile communication terminal device can be connected via the mobile communication network. In a mobile communication system capable of performing communication, the mobile communication terminal device has a communication quality value obtaining means for obtaining a predetermined communication quality value relating to the communication quality of the wireless channel, and a communication quality value obtaining means for obtaining the communication quality value. A time rate measuring means for measuring a time rate occupied during a predetermined averaging time during which the communication quality value obtained is below or above a predetermined threshold, and when requesting call setting to the base station apparatus. And a time rate notifying means for notifying the base station apparatus of predetermined information on the time rate measured by the time rate measuring means, and the mobile communication terminal is provided to the base station apparatus. The call setting rejection means for judging whether or not the call setting is possible based on the information notified by the time rate notifying means, and rejecting the call setting if the call setting is determined to be inappropriate. The call setting at the base station apparatus is performed based on the time rate at which the communication quality value is degraded so that the communication quality value falls below the predetermined threshold value or the time rate at which the communication quality is higher than the predetermined threshold value and is sufficient. Is determined, and if the call setting is inappropriate, the call setting is rejected. As a result, unnecessary call setting is prevented from being performed, and rejection of the call setting becomes unnecessary. Without doing so, it is possible to increase the channel use efficiency.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a mobile communication terminal device configured by applying a wireless communication device according to a first embodiment of the present invention.

FIG. 2 is an RSSI in an RSSI identification circuit 14a in FIG.
The figure which shows a mode of identification of a value.

FIG. 3 is a diagram showing how a low quality time rate τ1 is calculated by a low quality time rate calculation circuit 14b in FIG. 1;

FIG. 4 is a diagram showing how a high quality time rate τ2 is calculated by a high quality time rate calculation circuit 14c in FIG. 1;

FIG. 5 is a flowchart showing a processing procedure in a call connection process by the mobile terminal control unit 17 in FIG. 1;

FIG. 6 is a flowchart showing a processing procedure in a call disconnection process by the mobile terminal control unit 17 in FIG. 1;

FIG. 7 is a flowchart showing a processing procedure in communication quality display processing by the mobile terminal control unit 17 in FIG. 1;

FIG. 8 is a diagram showing a display example of circuit-switched communication quality and packet-switched communication quality.

FIG. 9 is a block diagram showing a main configuration of a mobile communication system according to a second embodiment of the present invention.

10 is a flowchart showing a processing procedure in a call connection process by the mobile terminal control unit 18 and a processing procedure in a call connection process by the base station control unit 24 in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mobile communication terminal apparatus 2 ... Base station apparatus 11 ... Antenna 12 ... Communication unit 12a ... Duplexer 12b ... Receiver 12c ... Transmitter 12d ... RSSI detection part 13 ... Signal processing unit 14 ... Communication quality detection unit 14a ... RSSI Identification circuit 14b Low quality time rate calculation circuit 14c High quality time rate calculation circuit 14d Timing circuit 14e, 14f Communication quality determination circuit 14g, 14h Selector 15 Operation unit 16 Display unit 17 Mobile terminal control unit 17a ... call setting rejection means 17b ... call disconnection means 17c ... quality display control means 18 ... mobile terminal control unit 18a ... time rate notification means 21 ... antenna 22 ... communication unit 23 ... signal processing unit 24 ... base station control unit 24a ... call connection Refusal means

Claims (13)

[Claims] 1. A wireless communication device for communicating with another wireless communication device via a wireless line, a communication quality value obtaining unit for obtaining a predetermined communication quality value related to a communication quality of the wireless line, And a time rate measuring means for measuring a time rate occupied during a predetermined averaging time during which the communication quality value obtained by the value obtaining means is below or above a predetermined threshold. Wireless communication device. 2. A communication quality value recognizing means for recognizing a communication quality value within a predetermined recognition time longer than a change cycle of the communication quality value acquired by the communication quality value acquiring means and shorter than the averaging time. And the time rate measuring means measures a time rate during which a communication quality value recognized by the communication quality value recognition means is below or above a predetermined threshold during a predetermined averaging time. The wireless communication device according to claim 1, wherein: 3. A call setting rejecting means for rejecting call setting when a time rate measured by the time rate measuring means and a predetermined reference value have a predetermined relationship at the time of request for call setting. The wireless communication device according to claim 1, wherein: 4. A communication system comprising a call disconnecting means for forcibly disconnecting a call if the time rate measured by the time rate measuring means and a predetermined reference value have a predetermined relationship during communication. The wireless communication device according to claim 1. 5. The wireless communication apparatus according to claim 1, further comprising a display unit for displaying predetermined information on the time rate measured by the time rate measurement unit. 6. The communication apparatus according to claim 1, wherein the threshold value and the averaging time are set according to each of a plurality of communication types, and use a value according to a communication type to be executed.
Alternatively, the wireless communication device according to claim 2. 7. The threshold value, the averaging time and the reference value are set according to each of a plurality of communication types,
7. The wireless communication apparatus according to claim 3, wherein an apparatus according to a communication type to be executed is used. 8. During standby, predetermined information relating to the time rates measured for each of the plurality of communication types by the time rate measuring means is displayed so as to be identifiable. The wireless communication device according to claim 6, further comprising a display unit configured to display predetermined information regarding a time rate measured by the time ratio measurement unit with respect to a type. 9. The wireless communication apparatus according to claim 5, wherein said display means displays a ratio of a time rate measured by said time rate measurement means to a predetermined reference value. 10. The wireless communication apparatus according to claim 6, wherein the communication types are packet-switched communication and circuit-switched communication. 11. By connecting a mobile communication terminal device to a base station device accommodated in a mobile communication network via a wireless line, the mobile communication terminal device can perform communication via the mobile communication network. In the mobile communication system to be enabled, the mobile communication terminal device includes: a communication quality value obtaining unit that obtains a predetermined communication quality value related to a communication quality of the wireless channel; and a communication quality value obtained by the communication quality value obtaining unit. A time rate measuring means for measuring a time rate occupied during a predetermined averaging time during which the period is below or above a predetermined threshold, and when requesting a call setup to the base station apparatus, the time rate And a time rate notifying means for notifying the base station apparatus of predetermined information on the time rate measured by the measuring means, and wherein the base station apparatus has a time rate notification of the mobile communication terminal apparatus. A mobile communication system comprising: call setting rejection means for judging whether call setting is possible based on information notified by the notifying means, and rejecting the call setting when judging that the call setting is inappropriate. . 12. By connecting a mobile communication terminal device to a base station device accommodated in a mobile communication network via a wireless line, the mobile communication terminal device can perform communication via the mobile communication network. In a mobile communication terminal device used in a mobile communication system capable of enabling, a communication quality value obtaining means for obtaining a predetermined communication quality value related to a communication quality of the wireless channel, and a communication obtained by the communication quality value obtaining means. A time rate measuring means for measuring a time rate occupied during a predetermined averaging time during which the quality value is below or above a predetermined threshold, and when requesting a call setup to the base station apparatus, A mobile communication terminal device comprising: a time rate notifying means for notifying the base station apparatus of predetermined information on the time rate measured by the time rate measuring means. 13. Connecting the mobile communication terminal device to a base station device accommodated in a mobile communication network via a wireless line so that the mobile communication terminal device communicates via the mobile communication network. Communication quality value acquisition means for enabling the mobile communication terminal device to acquire a predetermined communication quality value related to the communication quality of the wireless channel; and communication quality acquired by the communication quality value acquisition means. A time rate measuring unit that measures a time rate occupied during a predetermined averaging time during which the value is below or above a predetermined threshold, and when requesting a call setup to the base station apparatus, A base station device used in a mobile communication system comprising: a time rate notifying unit that notifies predetermined information relating to the time rate measured by the time rate measuring unit to the base station device; Base station comprising call setting rejection means for judging whether or not call setting is possible based on information notified by the communication terminal device, and rejecting the call setting when judging that the call setting is inappropriate. apparatus.