JPH0851394A - Radio telephone set and judging method for its communication state - Google Patents

Abstract

PURPOSE:To easily discriminate causes of defective communication due to conditions of an electromagnetic waves or by other reasons by providing a cordless telephone set capable of judging the state of the communication on the basis of the receiving state of a control channel and a judging method for the same. CONSTITUTION:The generation of the control channel cch from the received electromagnetic wave and its dissolution are executed by frame generation/ dissolution circuit 14. Further, there is a CRC error and synchronous word error detection circuit 15 in a part of this circuit 4, and a detected CRC error and a detected synchronous word error can be read out successively by a processor. Then, the processor 19 counts the number of the received control channels cch in conformity to a predetermined program, and calculates the probability of the reception of the channel cch by dividing the sum of the number of the control channels in which the detected CRC error and the detected synchronous word error do not occur by the number of the counted control channels. This result is displayed as receiving state indication 4 on a receiving state display screen or is reported to a user by a speaker 18 through an audio circuit 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame-synchronous radiotelephone and a method for determining its communication state, and relates to a cordless telephone or a cellular telephone which is composed of a master unit connected to an exchange network and a movable slave unit. The present invention relates to a wireless telephone and a communication state determination method thereof, which are suitable for discriminating whether a radio wave condition is the cause or another cause when an inoperable state of the device occurs.

[0002]

2. Description of the Related Art Conventionally, in a cordless telephone device,
Generally, the display of radio wave condition was not performed. In addition, although the strength of radio waves was displayed as an indication of the radio wave condition on a cellular telephone, if the display of the radio wave condition indicates the strength of the radio wave, the presence or absence of radio wave interference is unknown, and It was hard to say that it was possible to take sufficient measures and take measures.

Further, in the cordless telephone system, as described in Japanese Patent Laid-Open No. 5-244079, a method of coping with a radio wave disturbance by changing the control channel is studied. However, no consideration was given to the method of determining the superiority or inferiority of the radio wave condition using the control channel.

[0004]

Since the cordless telephone device uses a radio to make a call, the phenomenon that a call cannot be made or noise is generated due to the influence of radio wave interference or the like occurs.

However, when such a phenomenon causes a problem that the devices cannot be connected to each other during the installation work of the devices, the above-mentioned conventional technique cannot grasp the state of the radio wave. , It is very difficult to determine whether this phenomenon is caused by the radio wave condition or another cause (error of installation work of the device, etc.),
There was a problem in that the part that relies heavily on the experience and intuition of a construction worker or maintenance worker was large.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to adjust the synchronization by a frame synchronization method and perform the communication in a cordless telephone depending on the reception state of the control channel. Provide a cordless telephone that can determine the communication status and a method for determining the communication status, and when a communication failure occurs due to installation work as described above, the cause is the radio wave status or other causes. It is to provide a simple and easy dividing method depending on whether it is due to.

Another object of the present invention is to change the frequency of the control channel by judging the communication state according to the reception state of the control channel, or to sequentially try the optimum control channel frequency. , To provide a cordless telephone that corrects the communication condition to be better.

[0008]

In order to achieve the above-mentioned object, the structure of the invention relating to the communication state determining method of the radiotelephone of the present invention is such that the synchronization is adjusted by the frame synchronous method and the radio channel is controlled by the control channel. In a method of performing control to determine the superiority or inferiority of the communication state of a wireless telephone that performs wireless communication, the superiority or inferiority of the communication state is determined based on the reception state of the control channel.

More specifically, in the communication state determining method for the wireless telephone set, the control channel reception probability is defined as the control channel reception probability of the control channels that have been received normally without error among the received control channels. The state is determined by the reception probability of the control channel.

More specifically, the control channel has a sync word and a CRC code bit, and the error is a sync word error and a CRC error.

In order to achieve the above-mentioned object, another configuration of the invention relating to the communication state determining method of the radiotelephone of the present invention is that in the communication state determining method of the radiotelephone, it is determined that the radio wave communication state is bad. In this case, the frequency of the control channel is automatically switched.

Still another configuration is such that the frequencies of a plurality of usable control channels are sequentially and automatically tested, and the frequency with the better result is used for communication.

In order to achieve the above object, the configuration of the invention relating to the radiotelephone of the present invention is a radiotelephone having display means for displaying the communication state, in the communication state determining method of the radiotelephone. The result is displayed on the display means.

In order to achieve the above-mentioned object, another structure of the invention relating to the radiotelephone of the present invention is that in a radiotelephone having voice generating means, the result of the communication state determination method of the radiotelephone is It is designed to be generated by voice means.

Further, another configuration of the invention relating to the radiotelephone of the present invention is, in a radiotelephone having a processor and a high frequency circuit, determining the communication state of the radiotelephone for changing the control channel according to a program interpreted by the processor. The frequency of the control channel of the method is controlled.

[0016]

[Action] by detecting a CRC error and sync word error of the control channel may be a prospect of good communication state between devices, and displays on the phone of the display device is a display unit that, the speaker It can be notified by a hustle sound.

Further, better communication can be obtained by changing the frequency of the control channel or sequentially trying the optimum frequency of the control channel according to the determined communication state.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS. First, the basic idea of the present invention will be described with reference to FIG. FIG. 1 is a conceptual diagram when the present invention is applied to a cordless telephone.

Generally, in a cordless telephone that adjusts the synchronization by the frame synchronization method when the master unit 1 and the slave unit 2 communicate with each other, the master unit 1 sends a control channel cch, and the slave unit 2 periodically. The control channel cch from the base unit 1 is monitored to receive an instruction from the base unit 1 such as an incoming call.

The present invention intends to use this control channel cch for judging the superiority or inferiority of the communication state.

In FIG. 1, the reception status display screen 3 of the handset 2 displays the good reception status by displaying the probability of reception of the control channel cch as a percentage by performing an operation such as inputting a command. are doing. An example of how to obtain the reception probability will be described later. Further, in FIG. 1, the handset 2 displays the reception state, but it is of course possible for the base 1 to display such a display.

Next, the relationship between a general control channel structure and the present invention will be described with reference to FIG. Figure 2
It is a schematic diagram showing an example of a configuration of a control channel applicable to the present invention.

The control channel is a special frame for controlling a wireless line when wireless communication is performed in frame synchronization, and a frequency different from that of other frames is assigned. The sync word 8 and the CRC code bit 10 of FIG. 2 are important in the context of the present invention.

That is, the control channel cch is provided with a sync word 8 for frame synchronization and a CRC code bit 10 for judging data error,
The present invention detects the reception error of the control channel by determining the reception side of the synchronization word 8 on the receiving side, the presence or absence of a CRC error detected using the CRC code bit 10, etc., and determines the superiority or inferiority of the reception state. To do.

Next, the configuration of the cordless telephone according to the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the configuration of the cordless telephone according to the present invention.

The generation and disassembly of the control channel cch from the received radio wave is carried out by the frame generation / disassembly circuit.
Further, a CRC error and sync word error detection circuit 15 is provided in a part of this circuit so that the detected CRC error and sync word error can be sequentially read by the processor. In the present invention, the processor 19 is predetermined. According to the program, the number of control channels cch received is counted, and the sum of the number of detected CRC errors and the number of control channels cch in which the synchronization word error does not occur is divided by the number of counted control channels cch. Calculate the probability of receiving. That is, it is calculated by the following equation (1).

[0027]

[Equation 1]

Then, as described above, the result is as follows.
The information is displayed on the reception state display screen 3 as the reception state display 4, or the user is informed by a sound from the speaker 18 via the voice circuit 16.

Further, when it is determined by the probability of receiving the control channel that the reception state of the radio wave is bad, the processor 19 gives an instruction to the high frequency circuit 12 according to a predetermined program to control the frequency of the control channel. It is also possible to switch automatically.

Further, a method of giving an instruction to the high frequency circuit 12 by a program given to the processor 19 to automatically and sequentially test a plurality of usable control channel frequencies and using the better frequency is also conceivable.

Next, the structure of the CRC error and sync word error detection circuit according to the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing an example of the configuration of the CRC error and sync word error detection circuit 15.

The sync word pattern detection circuit 21 constantly monitors the received signal and outputs a sync word detection signal when a predetermined sync word pattern is detected. The sync word detection signal enters the fuller hole circuit 23. Then, the fuller hole circuit 23 becomes in a synchronized state when it confirms that the synchronization word is periodically detected (that the synchronization word is continuously detected), and the frame start position (control channel) is periodically obtained. Signal indicating the head position of the CRC error detection circuit 22 and the synchronization word detection circuit 24.
To put out.

According to this frame head position signal, CRC
CRC calculation is performed in the error detection circuit 22, and a CRC and error signal is output in the case of an error.

In the sync word detection circuit 24,
If the sync word pattern is not detected at the sync word position calculated from the frame start position signal, a sync word error signal is issued.

Next, the fault isolation method when connection is impossible, which is used in the present invention, will be described with reference to FIG. Figure 5
It is a flowchart figure explaining the fault isolation method at the time of connection failure of a cordless telephone by the reception probability of a control channel.

When a failure occurs, a normal construction worker or a maintenance person tests the reception state. According to this result, if the probability of receiving the control channel cch described above (hereinafter simply referred to as “reception probability”) is 95% or more, it is assumed that the transmission of the radio wave from the master unit and the transmission of the radio wave in the space are normal. Since there is a high possibility that construction errors will occur on the slave unit side, it is necessary to carry out an intensive check on that part.

On the other hand, if the reception probability is 10% or less, it is assumed that the transmission of radio waves from the master unit is not normal, and it can be determined that there is a high possibility of construction error on the master unit side. It is sufficient to carry out various checks.

The reception probability is other than that (10% to 95%).
%), There is a high possibility that connection will be impossible due to the radio wave condition, and measures such as changing the control frequency and changing the installation location should be taken.

[0039]

According to the present invention, in a cordless telephone that performs communication by adjusting synchronization in a frame synchronization system, the cordless telephone that can determine the communication state based on the reception state of the control channel and the communication state determination method thereof. To provide a simple and easy method for determining whether a communication failure occurs due to installation work as described above, whether the cause is the radio wave condition or another cause. You can

Further, according to the present invention, the frequency of the control channel is changed by judging the state of communication according to the reception state of the control channel, or the optimum frequency of the control channel is sequentially tried, thereby improving the It is possible to provide a cordless telephone that corrects the communication state so as to be good.

[Brief description of drawings]

FIG. 1 is a conceptual diagram when the present invention is applied to a cordless telephone.

FIG. 2 is a schematic diagram showing an example of a configuration of a control channel applicable to the present invention.

FIG. 3 is a block diagram showing an example of the configuration of a cordless telephone according to the present invention.

FIG. 4 is a block diagram showing an example of the configuration of a CRC error and sync word error detection circuit 15.

FIG. 5 is a flow chart diagram for explaining a fault isolation method when a cordless telephone cannot be connected depending on a reception probability of a control channel.

[Explanation of symbols]

 cch ... control channel 1 ... cordless telephone master unit 2 ... cordless telephone slave unit 3 ... reception status display screen 4 ... reception status display 5 ... transient response lamp time 6 ... start symbol 7 ... preamble 8 ... synchronization word 9 ... control data 10 ... CRC (Cycric Redundancy Check) code bit 11 ... Antenna 12 ... High frequency circuit 13 ... Modem circuit 14 ... Frame generation / decomposition circuit 15 ... CRC error and sync word error detection circuit 16 ... Voice processing circuit 17 ... Microphone 18 ... Speaker 19 ... Processor 20 ... Keypad 21 ... Synchronous word pattern detection circuit 22 ... CRC error detection circuit 23 ... Flywheel circuit 24 ... Synchronous word error detection circuit

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H04B 7/26 109 T (72) Inventor Masaaki Yoshimura 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Ltd. Information and Communication Division (72) Inventor Kazuyuki Tate 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Yukihiro Shimura 5-7-1 Shiba, Minato-ku, Tokyo NEC Stock company (72) Inventor Noriho Furuya 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (8)

[Claims] 1. A method for determining superiority or inferiority of a communication state of a wireless telephone which performs wireless communication by adjusting synchronization by a frame synchronization type and controlling a wireless line by a control channel, wherein: A method of determining the communication state of a wireless telephone, which comprises determining the superiority or inferiority of the communication state. 2. The control channel reception state is determined by the control channel reception probability, with the rate of the control channel that has been received normally without any error among the received control channels as the control channel reception probability. The method for determining a communication state of a wireless telephone according to claim 1, wherein: 3. The control channel is a sync word and a CR.
3. The method according to claim 2, wherein the method has a C code bit, and the error is a sync word error or a CRC error. 4. The method according to claim 1, wherein the frequency of the control channel is automatically switched when it is determined that the communication state is poor. 5. The method according to claim 1, wherein the frequencies of a plurality of usable control channels are automatically tested sequentially, and the frequency with the better result is used for communication. Item 5. A method for determining a communication status of any one of the wireless telephones according to Item 3. 6. A wireless telephone having a display means for displaying a communication status, wherein the display means displays the result of the communication status determination method of the wireless telephone according to any one of claims 1 to 3. Characteristic wireless telephone. 7. A radiotelephone having voice generating means, wherein the voice means generates a result of the communication state determining method of the radiotelephone according to any one of claims 1 to 3. . 8. A wireless telephone having a processor and a high-frequency circuit, according to a program interpreted by the processor,
Alternatively, a radio telephone which controls the frequency of the control channel according to claim 5.