JPH09284206A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid deterioration in quality of data transmission and useless increase in traffic by conducting data transmission only when a state of a communication channel is excellent. SOLUTION: An idle signal from a base station C is received by a radio section 11, a MODEM section 12, a CODEC section 13 of a mobile radio equipment T, based on it a CPU 16 detects a reception electric field strength level and an error rate to discriminate a state of a channel. Only when the state of the channel is excellent, data stored in a RAM 15 are modulated and the modulated data are sent from the radio section 11. Thus, the data are sent by taking deterioration in quality of a radio channel due to multi-path or fading or the like into account, then the transmission quality is enhanced and the traffic efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device used for mobile communication, and more particularly to a wireless communication device capable of performing data transmission while monitoring the line status on the mobile device side.

[0002]

2. Description of the Related Art When performing data transmission between mobile radios or a base station using a data transmission terminal connected to a mobile radio, data transmission is performed depending on a line state accompanying movement of the mobile radio. Quality may be deteriorated.
For this reason, conventionally, in order to display whether communication is possible or not, there has been proposed a display device of a communication device which displays an out-of-range / in-range display or a received electric field level.

[0003]

In such a conventional radio communication device, when the above-mentioned in-area display or a display indicating that the received electric field level is an effective level is displayed, data transmission is not possible. When there is a request, the connection with the base station or another mobile radio device is performed in real time in response to this request, and data transmission is performed. For this reason,
Since data transmission is performed even in a state where the data transmission quality may be deteriorated due to multipath, fading, etc., the quality of data transmission frequently deteriorates. The reason for this is that the display within the area and the level of the received electric field are based on the judgment level of voice communication in the mobile device, and this judgment level does not directly judge the suitability of data transmission.

Further, such a wireless communication device can perform data transmission even when the communication line is in a bad state, and as a result, data retransmission, line disconnection and line reconnection are repeated. This was one of the causes of the increase in traffic. The reason is that voice communication has the redundancy of being able to understand the preceding or following words even if a part of the voice is missing. However, in data transmission, even if one data is lost, the reliability of the data is affected, so that the reliability of the data is increased by resending the data.

An object of the present invention is to carry out data transmission only when the communication line is in a good state, thereby making it possible to avoid the above-mentioned deterioration of data transmission quality and unnecessary increase of traffic. To provide a wireless communication device.

[0006]

A wireless communication apparatus of the present invention receives an idle signal transmitted from a partner station and determines the state of a wireless line based on this idle signal, and wireless means from this determination result. It is characterized by comprising means for connecting a wireless line with a partner station when the state of the line satisfies a certain condition, and means for performing data transmission with the partner station when the wireless line is connected. . In this case, the wireless line is connected when the received electric field level of the idle signal is a certain level or more and the error rate is less than a certain standard. Further, it has a storage means for storing data to be transmitted, and is configured to transmit the accumulated data to the partner station when the wireless line is connected.

For example, as a preferred configuration of the wireless communication apparatus of the present invention, a wireless unit capable of receiving an idle signal transmitted from a partner station and transmitting / receiving data, and demodulating and transmitting / receiving the received idle signal. A modulation / demodulation means for modulating / demodulating data, and a CPU for detecting the received electric field level and error rate of the demodulated idle signal to judge the state of the wireless line
And a storage means for accumulating data, and the CPU is configured to control the modulation / demodulation means and the wireless section to the operating state when it is determined that the wireless line is in a good state. Also,
It is preferable to include a display for displaying whether or not data transmission is possible based on the state of the wireless line.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of a wireless communication device according to the present invention, and particularly is a diagram showing an internal configuration of a mobile wireless device. The mobile radio T is connected to the base station C via a radio line. The base station C is capable of transmitting an idle signal to the mobile radio T at all times or intermittently, and the mobile radio T receives the idle signal, and based on this, the mobile radio T communicates with the base station C. The state of the wireless line is determined.

That is, the mobile radio T has a radio section 11 for establishing a radio connection with the base station C, a modem section 12 for modulating a transmission signal and demodulating a reception signal, and predetermined data. A codec section 13 for converting into a format or vice versa, a data interface 14 for connecting an external information terminal device 20 and the codec section 13 to exchange data, and a storage means for temporarily storing this data. RAM 15, a CPU 16 for controlling data transmission / reception at least in the wireless unit 11 and for performing signal analysis, and a display circuit 18 for controlling display on the display 17 based on the output of the CPU 16. Is equipped with.

The signal analysis in the CPU 16 is based on the signal received by the radio section 11, demodulated by the modem section 12 and decoded by the codec section 13, and its received electric field strength and error rate in the received signal. Is recognized and the recognized result is compared with a predetermined reference value to determine the quality of the wireless line. As a result of this determination, if the line quality is stable without being affected by fading or the like, the display circuit 18
To the display 17 and display, for example, "DATA O
"K" is displayed, and at the same time, the data stored in the RAM 15 is coded by the codec unit 13, and the modem unit 12
Then, the wireless unit 11 transmits the signal. Also, the wireless unit 1
RAM1 by demodulating and decoding the signal received in 1
Store in 5. On the other hand, when it is determined that the line quality is unstable, the display circuit 18 displays, for example, “DATA NG” on the display unit 17, and the transmission / reception in the wireless unit 11 is stopped.

FIG. 2 is a flow chart for explaining the operation of the mobile radio shown in FIG. 1, and the data transmission operation will be described with reference to this flow chart. First, the base station C continuously or intermittently transmits an idle signal, and the mobile wireless device T receives the idle signal (S1). The idle signal received by the wireless unit 11 is transmitted to the modem unit 12,
The signal is demodulated by the codec unit 13, and the signal is analyzed by the CPU 16 as described above (S2). And
By analyzing the idle signal, the electric field detection level from the wireless unit 11 is compared with a predetermined reference (S3). If the electric field detection level is below the reference, the CPU 16 causes the display 17 to display “DATA”.
The display of "NG" is displayed and the next idle signal is analyzed (S4).

On the other hand, if the electric field detection level is equal to or higher than the predetermined reference, then the data error rate is determined (S5).
If the error rate is greater than or equal to a predetermined standard, the CPU 16
Displays "DATA NG" on the display 17 (S
4) The next idle signal is analyzed. If the error rate is less than or equal to the predetermined standard, the mobile radio T
It is determined that the quality of the wireless link between the base station C and the base station C is in a condition that stable DATA communication can be performed without being in a state of being interfered with by fading, multipath, etc.
"DATA OK" is displayed on the screen (S6).

Next, the CPU 16 confirms the state of the RAM 15 via the data interface 14 (S
7). When no data to be transmitted is stored in the RAM 15, the next idle signal is analyzed. RAM1
If the data is stored in 5, the CPU 16 controls the wireless unit 11 to connect the communication line to the base station C (S).
8). Then, after the line with the base station C is connected, RA
The data stored in M15 is coded by the codec unit 13, modulated by the modem unit 12, and transmitted from the wireless unit 11 to the base station C (S9). After all the data stored in the RAM 15 has been transmitted, the wireless line with the base station C is disconnected to end the data transmission (S10), and the next idle signal is analyzed.

The CPU 16 analyzes the idle signal at regular intervals to determine whether the display on the display 17 is updated and whether the RAM 15 stores data. This enables real-time data transmission.
Therefore, if this function is used, the operator of the mobile wireless device can perform data transmission only once when performing data transmission, and thereafter the mobile wireless device automatically changes the line status. Since the determination is made and the data transmission is executed at the timing when the line quality is good, the operator can realize reliable data transmission without being concerned about whether the data was transmitted or not.

On the contrary, it can also be used when transmitting data from a base station to a mobile radio.
In this case, in the base station C, when there is a traffic margin, data transmission is performed a plurality of times at intermittent timings, and in the mobile radio T, the CPU 16 determines the line state, and the radio unit at good timings. 11 is set to the receiving state and data is received. The received data is demodulated by the modem unit 12, decoded by the codec unit 13, accumulated in the RAM 15 via the data interface 14, and output to the information terminal device 20 in response to the operator's request. Then, by transmitting the reception of the data to the base station C, the base station C confirms that the data transmission is completed, and the data transmission is completed.

[0016]

As described above, according to the present invention, the idle signal transmitted from the partner station is received, the state of the wireless line is judged based on this idle signal, and the state of the wireless line is constant based on this judgment result. When the condition of is satisfied, it is configured to connect the wireless line with the partner station for data transmission, so that high quality data transmission can be realized, and data transmission can be retransmitted and the line can be disconnected or reconnected. It is possible to suppress the occurrence and efficiently perform data transmission. As a result, traffic can be reduced, and the number of subscribers can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of the present invention and an internal configuration of a mobile wireless device.

FIG. 2 is a flowchart for explaining the operation of the mobile wireless device of the present invention.

[Explanation of Codes] C Base Station T Mobile Radio 11 Radio Section 12 Modem Section 13 Codec Section 14 Interface 15 RAM 16 CPU 17 Display 18 Display Circuit

Claims (5)

[Claims] 1. A wireless communication device including a mobile wireless device that performs data transmission using a wireless line, receives an idle signal sent from a partner station, and determines the state of the wireless line based on the idle signal. Means, a means for connecting a radio line with a partner station when the condition of the radio line satisfies a certain condition based on this determination result, and a means for performing data transmission with the partner station when the radio line is connected A wireless communication device comprising: 2. The wireless communication device according to claim 1, wherein the wireless line is connected when the received electric field level of the idle signal is a certain level or more and the error rate is less than a certain reference. 3. The wireless communication device according to claim 1, further comprising storage means for storing data to be transmitted, and transmitting the accumulated data to a partner station when a wireless line is connected. 4. A radio section capable of receiving an idle signal transmitted from a partner station and transmitting / receiving data, a demodulating means for demodulating the received idle signal and modulating / demodulating the transmitted / received data, and a demodulated idle. CPU that determines the state of the wireless line by detecting the received electric field level and error rate of the signal
And a storage unit for accumulating data, wherein the CPU controls the modulation / demodulation unit and the wireless unit to be in an operating state when the CPU determines that the state of the wireless line is good. 5. The wireless communication device according to claim 1, further comprising a display for displaying whether or not data transmission is possible based on the state of the wireless line.