JPH09135203A - Communication quality display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely display actual communication quality in a mobile radio communication channel by measuring both a reception electric field strength and an error rate of a control signal for each unit time and displaying the communication quality in response to the result of both the measurements. SOLUTION: A mobile station making communication with required quality A operates a receiver 2 by a time when a control signal of a simultaneous call channel of a call reception group to which its own station belongs is sent from a base station under the control of a controller 6 to receive a call reception signal. Then a reception electric field strength measurement device 3 measures a reception electric field strength and an error rate measurement device 4 measures a frame error rate. A communication quality display device 5 under the control of the controller 6 receives the measurement value of the reception electric field strength outputted from the reception electric field strength measurement device 3 outputted and the measurement value of the frame error rate outputted from the error rate measurement device 4 for each unit time such as 6-second. Thus, the actual communication quality in the mobile radio communication channel is surely displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication quality display device for displaying the communication quality of a mobile radio communication line in advance on a mobile station terminal of a mobile radio communication system before starting communication.

[0002]

2. Description of the Related Art Communication quality in mobile radio communication lines is
It is determined by the received electric field strength due to the propagation loss according to the distance between the base station and the mobile station, and the intersymbol interference amount due to multipath fading. When a user tries to make a call,
It is convenient for the user to display on the mobile station terminal what kind of communication quality is used for the communication.

In the conventional communication quality display device, the display based on the received electric field strength among the two factors for determining the communication quality is performed by using the following means. FIG. 2 shows a configuration example of a control signal transmitted / received between the base station and the mobile station. The base station divides the control line into a plurality of units in time, and informs the mobile station of information such as the type of the base station a, and a paging line b1 to send an incoming signal to a mobile station with an incoming call. b9, the individual cell line c for transmitting and receiving control information for location registration and transmission is set. Here, in order to reduce the power consumption of the mobile station, the mobile station is classified into a plurality of incoming call groups, the general calling line is divided in time, and an incoming call signal is transmitted for each incoming call group. Conventionally, the base station sends control signals every 0.1 seconds, and the call signal for one incoming call group is sent at 1.2-second intervals (second-generation cordless telephone system, RCR STD-28).

FIG. 3 shows a configuration example of a mobile station including a conventional communication quality display device. The mobile station has an antenna 7 for both transmission and reception, a transmitter 1 for modulating and transmitting a transmission signal, a receiver 2 for demodulating the reception signal, and a reception electric field strength for measuring the electric field strength of a control signal as a communication quality display device. It has a measuring device 3 and a communication quality indicator 5 for displaying the communication quality according to the received electric field strength.

[0005] A mobile station belonging to a certain incoming call group receives a control signal of a paging line of the incoming call group to which the own station belongs during a waiting period waiting for an incoming call from the other party, during the waiting period. The machine 2 is operated to check whether or not there is an incoming call addressed to the own station. At the same time, the reception electric field strength measuring device 3 measures the reception electric field strength of the control signal and sends the measurement result to the communication quality indicator 5. On the communication quality indicator 5, a plurality of thresholds for displaying the communication quality based on the received electric field strength measurement result are set, and a symbol or a number indicating the communication quality is displayed. For example, the received electric field strength is divided into four stages from E1 to E4. When the received electric field strength is E3 or more, three display symbols indicate that the communication quality is very good, and when E2 or more, the display is displayed. Two symbols indicate that communication quality is generally good. One or more display symbols indicate that communication quality is poor, but communication can be continued when E1 or more, and 0 display symbol when E1 or less. Indicates that communication is not possible. By looking at the number of display symbols, the user can know the communication quality at the current location prior to communication.

[0006]

By the way, the communication quality in the mobile radio communication line is not determined only by the received electric field strength as described above, but is greatly influenced by the intersymbol interference amount due to multipath fading, that is, the delay spread. . Therefore, even if the conventional communication quality display device displays a point where the communication quality is very good, the communication quality becomes very poor if the delay spread is large. That is, the display on the communication quality indicator is different from the actual communication state.

Further, in the conventional communication quality display device, while the control signal of the simultaneous call line of the incoming call group to which the own station belongs is transmitted from the base station, the received electric field strength at that time is measured to estimate the communication quality. doing. Therefore, the measurement time is short and sufficient measurement accuracy may not be obtained in some cases. An object of the present invention is to provide a communication quality display device capable of displaying the actual communication quality in a mobile radio communication line with high accuracy.

[0008]

In the communication quality display device of the present invention, both the received electric field strength of the control signal and the error rate (intersymbol interference amount) are measured every unit time, and communication is performed according to both measurement results. Display quality. As a result, the actual communication quality of the mobile radio communication line can be displayed accurately.

Although the required communication quality differs depending on the type of information to be transmitted / received, for example, when high communication quality is required, control signals other than the paging line of the incoming call group to which the own station belongs are also received. To increase the frequency of receiving the control signal (claims 2 and 3). Thereby, the received electric field strength and error rate of the control signal can be measured with high accuracy in a predetermined unit time, and the communication quality with high accuracy can be displayed in a short time.

[0010]

FIG. 1 shows an embodiment of a mobile station including the communication quality display device of the present invention. In the figure, solid arrows indicate signal flows, and dashed arrows indicate device control signals. The mobile station has an antenna 7 for both transmission and reception, a transmitter 1 for modulating and transmitting a transmission signal, a receiver 2 for demodulating the reception signal, and a reception electric field strength for measuring the electric field strength of a control signal as a communication quality display device. It has a measuring device 3, an error rate measuring device 4 for measuring a frame error rate of a control signal, a communication quality indicator 5 for displaying communication quality according to a received electric field strength and a frame error rate, and a controller 6. In this embodiment, the frame error rate that indirectly represents the intersymbol interference amount is measured.

The controller 6 determines the required communication quality according to the type of information to be transmitted and received, and the receiver 2 receives only the control signal addressed to its own station or the control signal not addressed to its own station. Select whether to include it. Further, the unit time set in the reception electric field strength measuring device 3 and the error rate measuring device 4 is controlled, and the measurement cycle of the reception electric field strength and the frame error rate and the display cycle of the communication quality are changed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The type and transmission cycle of a control signal on a control line transmitted by a base station is the same as the conventional one shown in FIG. The mobile station of the present invention transmits and receives a plurality of information such as voice, data and images. The required communication quality differs depending on the type of information transmitted and received. In this embodiment, the required communication quality has two levels A and B shown in Table 1. For example, "communicable" in the communication of the required quality A means that the received electric field strength is E1 or more and the frame error rate is 0.2 or less.

[0013]

[Table 1]

(Communication Quality Display in Required Quality A) A mobile station which performs communication of required quality A is controlled by the controller 6
At the same time that the control signal of the paging line of the incoming call group to which the own station belongs is transmitted from the base station (every 1.2 seconds in this embodiment), the receiver 2 is operated to receive the incoming signal, and at the same time, the received electric field strength is increased. The measuring instrument 3 measures the received electric field strength and the error rate measuring instrument 4 measures the frame error rate. In the communication of the required quality A, the frame error rate is 0.2 or less and "communication is possible". Therefore, it is measured whether or not a frame error occurs at a rate of once or less every 5 frames. Therefore, the error rate measuring device 4 outputs the measured value of the frame error rate in a cycle of once per unit time of 6 seconds required for measuring 5 frames.

The communication quality indicator 5 is output by the error rate measuring device 4 and the measured value of the received electric field intensity output by the receiving electric field intensity measuring device 3 every unit time of 6 seconds under the control of the controller 6. Enter the measured frame error rate, and display the symbol indicating "communication is possible" when the received field strength is E1 or higher and the frame error rate is 0.2 or lower. The communication quality indicator 5 periodically repeats this communication quality display every unit time of 6 seconds. In addition, the reception electric field strength measuring device 3 has a unit time of 6
You may make it output the average value of the received electric field strength for a second.

Further, the communication quality indicator 5 indicates that if no frame error is observed for 10 unit time (1 minute, 50 frames) continuously, the frame error rate is 0.02 or less, and the received electric field strength is E2 or more, communication is performed. Display a symbol that indicates "very good" quality. A frame error was observed before 1 minute passed and the frame error rate exceeded 0.02.
When it becomes 0.2 or less, or when the received electric field strength becomes E1 or more and less than E2, the communication quality display is changed to a symbol indicating "communication is possible". In addition, a frame error occurs at a rate of more than once in 5 frames, and the frame error rate is
When it exceeds 0.2 or when the received electric field strength becomes less than E1, the communication quality display is erased to indicate that communication is impossible.

(Communication Quality Display in Required Quality B) The mobile station which communicates in the required quality B is controlled by the controller 6,
In addition to the paging line of the incoming call group to which the own station belongs, the alert line sent by the base station, the paging line of the other incoming call group,
Each control signal of the individual cell line is also received. That is, the receiver 2 is continuously operated to receive each control signal, and at the same time, the reception electric field strength measuring device 3 measures the reception electric field strength and the error rate measuring device 4 measures the frame error rate. In the communication of the required quality B, the frame error rate is 0.01 or less and "communication is possible", so it is measured whether or not a frame error occurs at a rate of once or less per 100 frames. Therefore, the error rate measuring instrument 4 requires 10 for measuring 100 frames.
The measurement value of the frame error rate is output once per unit time of second.

The communication quality indicator 5 is output by the error rate measuring device 4 and the measured value of the received electric field intensity output by the receiving electric field intensity measuring device 3 every 10 seconds under the control of the controller 6. Input the measured value of the frame error rate, and display the symbol indicating "communication is possible" when the received electric field strength is E3 or more and the frame error rate is 0.01 or less. The communication quality indicator 5 periodically repeats this communication quality display every unit time of 10 seconds.

Furthermore, the communication quality indicator 5 indicates that if no frame error is observed continuously for 10 unit time (100 seconds, 1000 frames), the frame error rate is 0.001 or less, and the received electric field strength is E4 or more, communication is performed. Quality is "very good"
A symbol indicating that is displayed. A frame error is observed 100 seconds after that, and the frame error rate is 0.0.
When it exceeds 0.01 and becomes 0.01 or less, or when the received electric field strength becomes E3 or more and less than E4, the display of the communication quality is changed to a symbol indicating “communication is possible”. Also, when a frame error occurs more than once in 100 frames and the frame error rate exceeds 0.01, or when the received electric field strength is less than E3, the communication quality display is erased and communication is disabled. Is shown.

[0020]

As described above, the communication quality display device of the present invention can accurately display the communication quality determined by the received electric field strength and the intersymbol interference amount. Further, even when trying to communicate the type of information that requires high accuracy, it is possible to display accurate communication quality in a short time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a mobile station including a communication quality display device of the present invention.

FIG. 2 is a diagram showing a configuration example of a control signal transmitted / received between a base station and a mobile station.

FIG. 3 is a block diagram showing a configuration example of a mobile station including a conventional communication quality display device.

[Explanation of symbols]

 1 transmitter 2 receiver 3 received electric field strength measuring device 4 error rate measuring device 5 communication quality indicator 6 controller 7 transmitter / receiver antenna

Claims (3)

[Claims] 1. A receiver for receiving a control signal addressed to itself, which is intermittently transmitted from a base station of a mobile radio communication system to a mobile station, and an integral multiple of a cycle in which the control signal addressed to the own station is received. The unit of time is, the reception field strength measuring device for measuring the reception field strength of the control signal for each unit time, an error rate measuring device for measuring the error rate of the control signal in the unit time, and the unit A communication quality indicator that inputs the received electric field strength and error rate of the control signal measured for each time and displays the communication quality of the mobile radio communication line according to the values, the reception timing of the receiver and the unit time And a controller that causes the communication quality indicator to display the communication quality according to the unit time. 2. A receiver for receiving a control signal addressed to itself and a control signal other than addressed to itself, which are intermittently transmitted from the base station of the mobile radio communication system to the mobile station, and each control signal is received. A unit time is a time that is an integral multiple of the cycle, and a reception field strength measuring device that measures the reception field strength of the control signal for each unit time, and an error rate measurement that measures the error rate of the control signal at the unit time. And a communication quality indicator for inputting the received electric field strength and error rate of the control signal measured for each unit time and displaying the communication quality of the mobile radio communication line according to the values, and the reception by the receiver A communication quality display device, comprising: a controller that sets timing and the unit time, and causes the communication quality display to display the communication quality according to the unit time. 3. The communication quality display device according to claim 1 or 2, wherein the controller is a voice that is transmitted and received between the base station and the mobile station,
A unit required for determining the required communication quality according to the type of data, image, and other information, selecting the control signal reception timing at the receiver accordingly, and further measuring the control signal reception field strength and error rate. A communication quality display device having a structure for controlling time.