JP3356743B2 - Radio relay station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, PHS
(Personal Handyphone System) and PDC (Personal D
The present invention relates to a wireless relay station that relays between mobile stations that wirelessly communicate in a digital communication system, such as an digital cellar (digital cellar) system.

[0002]

2. Description of the Related Art As is well known, a radio relay station such as a master unit connected to a public network relays an extension call between slave units A and B which can be used as PHS terminals as shown in FIG. Is possible.

However, for example, as shown in FIG.
Even if a reception error is detected by the base unit due to deterioration of the radio wave environment from the base unit A to the base unit, the base unit reconstructs the received data including the error received from the base unit A and transmits the data to the base unit B. I do.

For this reason, if the radio wave environment from the master unit to the slave unit B is good, the slave unit B determines that there is no error in the data received from the master unit. Therefore, in such a case, in the slave unit B, the noise suppression function that functions when an error is included in the received data does not work, and there is a high possibility that large noise is generated in the audio output. Note that this problem is not limited to a home master unit that performs extension relaying, but also exists in a relay station that performs relaying between wireless mobile stations using a digital communication method.

[0005]

In a conventional radio relay station, when relaying communication, even if there is an error in data received from one mobile station, the received data is reconstructed and the other mobile station is reconfigured. Since the data is transmitted to the station, there is a problem that the other mobile station cannot recognize the data as containing an error, and there is a high possibility that large noise is generated in the output voice.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. When relaying wireless communication, even if there is an error in data received from a mobile station, the relay destination mobile station outputs an audio signal. It is an object of the present invention to provide a radio relay station capable of performing relay without generating large noise.

[0007]

In order to achieve the above object, the present invention relates to a radio relay station which can be connected to a communication network and is capable of relaying between radio-connected mobile stations. Error determining means for determining whether there is an error in received data received from the mobile station through wireless connection based on determination data set in the received data when relaying between stations; When the means determines that there is an error in the received data, the determination data in the received data is
Data transfer means for converting the data into predetermined determination data irrelevant to the content of the received data and transmitting the converted data to the mobile station at the relay destination is provided.

[0008] In the radio relay station having the above configuration, when there is an error in the received data, the decision data in the received data is converted into predetermined decision data irrelevant to the content of the received data. Is transmitted to the relay destination mobile station.

[0009] Therefore, according to the radio relay station having the above configuration, when there is an error in the received data, determination data irrelevant to the content of the received data is set in the received data. For this reason, the mobile station at the relay destination determines that the received data is data containing an error. Therefore, when reproducing the voice based on the received data, various noise suppression functions such as lowering the output level may be performed. Thus, it is possible to prevent generation of large noise in the output sound.

According to another aspect of the present invention, there is provided a radio relay station which is connectable to a communication network and is capable of relaying between wirelessly connected mobile stations. When performing, the error determination means for determining whether there is an error in the data received from the mobile station by wireless connection, and if the data received by the error determination means is determined to be error, the data is Data transfer means for setting to predetermined data and transmitting the data to the relay destination mobile station is provided.

[0011] In the radio relay station having the above configuration, when there is an error in the received data, the received data is set to predetermined data and then transmitted to the relay destination mobile station. Therefore, according to the wireless relay station having the above configuration, when there is an error in the received data, the received data is set to predetermined data. For this reason, the mobile station at the relay destination determines that the data contains an error, and various noise suppression functions such as lowering the output voice level operate to prevent large noise from being generated in the output voice. Can be.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Here, the base station of a digital cordless telephone set provided in a home or a business office will be described as an example of a relay station. FIG. 1 shows the configuration of the master unit. Note that, in this figure, the parts related to the present invention are mainly shown, and the description of other components not shown is omitted.

The master unit shown in FIG. 1 includes a radio unit 110 having an antenna 111, a modem unit 120, a channel codec unit 130, a communication unit 140, a control unit 150,
Memory unit 160 and user interface unit 170
And a handset 180.

A radio frequency signal transmitted from a slave unit (mobile radio terminal device) (not shown) via a radio communication channel is received by an antenna 111 and then received by a reception unit via a high frequency switch 112 (SW) of a radio unit 110. 113 is input.

In the receiving section 113, the received radio frequency signal is mixed with a reception local oscillation signal generated from the frequency synthesizer 114 and frequency-converted into a reception intermediate frequency signal. Note that the frequency synthesizer 1
The local oscillation frequency generated from 14 is instructed by control unit 150 according to the radio channel frequency.

The radio section 110 is provided with a reception field strength detection section (RSSI) 116. The reception electric field strength detection section 116 detects the reception electric field strength of the radio frequency signal arriving from the slave unit, and notifies the control section 150 of the detected value.

The received intermediate frequency signal output from the receiving unit 113 is input to the demodulation unit 121 of the modem unit 120. The demodulation section 121 performs digital demodulation of the received intermediate frequency signal, thereby reproducing a digital communication signal.

In the TDMA decoding section 131 of the channel codec section 130, the digital speech signal is decomposed for each time slot in accordance with an instruction from the control section 150.
The decomposed digital communication signal is input to the communication unit 140.

The communication unit 140 includes an adaptive difference PCM transcoder (ADPCM-TRANSCODER) 141.
And a PCM codec (PCM-CODEC) 142
, A cross point switch 143, and a local line circuit 144.
Consists of

The decomposed digital speech signal is sequentially decoded by the adaptive difference PCM transcoder 141 and PCM codec 142, reproduced as an analog speech signal, and input to the crosspoint switch 143.

The crosspoint switch 143 outputs the analog call signal to the public line via the line circuit 144. In the case of an extension call between the slave and the base unit, the analog call signal is output to the handset 180. In the case of an extension call between the slaves, the analog call signal is output to the handset 180.
Output to the CM codec 142. Handset 180
Is amplified by a receiving amplifier (not shown) and then output to a speaker 181 to be output as a loudspeaker.

On the other hand, a public line or a handset 180
The transmission voice input through the microphone (M) 182 and the analog call signal in the case of an extension call between slave units are transmitted through the crosspoint switch 143 to the PC.
The signals are sequentially encoded by the M codec 142 and the adaptive difference PCM transcoder 141 to become digital communication signals.

In the TDMA encoder 132, the digital speech signal output from the adaptive difference transcoder 141 is inserted into a desired time slot and multiplexed, and the multiplexed digital speech signal is
2 is input. In the modulator 122, the carrier signal is digitally modulated by the digital communication signal, and the modulated carrier signal is input to the transmitter 115.

In the transmitting section 115, the modulated carrier signal is mixed with a transmitting local oscillation signal generated from the frequency synthesizer 114, so that the controlling section 15
It is frequency-converted to the radio channel frequency indicated by 0 and further amplified to a predetermined transmission power level. Then, the radio frequency signal output from the transmitting unit 115 is transmitted from the antenna 111 to the slave via the high frequency switch 112.

The user interface unit 170 is provided with an LC
D and the like, and a display unit 171 for displaying the state of the terminal itself and telephone directory data to be described later, and a key input unit 172 for inputting data and registering various settings.

The memory unit 160 is, for example, a ROM or a RAM.
The storage medium is a semiconductor memory such as a storage medium. The storage medium includes a control program of the control unit 150 and an ID of the own device.
Data, ID data of the child device registered in the child device with this parent device,
It stores various setting information, various control data such as trouble data, and telephone directory data such as speed dial numbers.

The control unit 150 includes, for example, a microcomputer as a main control unit. In addition to the control functions required for controlling each unit and transmitting and receiving data as described above, the control unit 150 is also used for newly establishing an extension call between slave units. When an error occurs in the data received from the slave unit, a function is provided for performing predetermined processing on the received data and relaying the data.

Next, the operation of the above-configured master unit during an extension call between slave units will be described. FIG. 2 is a flowchart showing a process performed by the control unit 150 during this operation. This process is executed every time data is received from the slave unit.

First, in step 2a, an error detection process by CRC is performed on the data received from one of the slave units, and the process proceeds to step 2b. Step 2b
Then, it is determined whether an error has been detected by the process of step 2a. Here, when an error is detected, the process proceeds to step 2c, and when no error is detected, the process proceeds to step 2d.

In step 2c, no processing is performed on the audio data portion of the received data,
For the RC check bit portion, for example, “000
.. "And" 111... "Are converted into a predetermined data sequence irrespective of the audio data sequence, and the process proceeds to step 2e.

In step 2d, a CRC check bit corresponding to the audio data is generated, the CRC check bit is set in the received data, and the process proceeds to step 2e. In step 2e, the received data is transmitted to the slave device that is the relay destination, and the process ends.

As described above, in the master unit having the above configuration, FIG.
As shown in (2), when it is determined that there is an error in the data received during the extension call between the slave units, the CRC check bit is converted into a data string irrelevant to the data string of the voice data in the received data. I have to.

Therefore, according to the master unit having the above configuration, if there is an error in the data received from one of the slave units, a CRC check bit irrelevant to the data sequence of the audio data is added, so that relaying is performed. The previous slave unit determines that there is an error in the audio data to be relayed, and operates various noise suppression functions such as lowering the output audio level, preventing large noises in the output audio. can do.

The present invention is not limited to the above embodiment. For example, in the above embodiment, when it is determined that there is an error in the received data during the extension call between the slave units, the CRC check bit is set to “irrespective of the data sequence of the voice data in the received data. The data string is converted to a data string of "0" or "1". Instead of this, for example, a result of inverting the above CRC check bits "0" and "1" is added to the audio data as a CRC check bit. May be transmitted.

For example, as shown in FIG. 4, audio data in the received data may be converted into a predetermined data sequence. Even with such audio data conversion processing, it is possible to prevent a large noise from being generated in the output audio in the slave device at the relay destination.

The same effect can be exerted by simultaneously performing the above-described CRC check bit conversion processing and audio data conversion processing. It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0037]

As described above, according to the present invention, when there is an error in the received data, the judgment data in the received data is converted into predetermined judgment data irrelevant to the contents of the received data. Thus, the received data is transmitted to the mobile station at the relay destination.

Therefore, according to the present invention, when there is an error in the received data, determination data irrelevant to the contents of the received data is set in the received data. For this reason, the mobile station at the relay destination determines that the received data is data containing an error. Therefore, when reproducing the voice based on the received data, various noise suppression functions such as lowering the output level may be performed. Therefore, it is possible to provide a wireless relay station capable of preventing generation of large noise in output voice.

As described above, according to the present invention, when there is an error in the received data, the received data is set to predetermined data and then transmitted to the relay destination mobile station.

Therefore, according to the present invention, when there is an error in the received data, the received data is set to predetermined data. For this reason, the mobile station at the relay destination determines that the data contains an error, and various noise suppression functions such as lowering the output voice level operate to prevent large noise from being generated in the output voice. Can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of an embodiment of a radio relay station according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the wireless relay station shown in FIG. 1 during an extension call between slave units.

FIG. 3 is a diagram for explaining the operation of the wireless relay station shown in FIG. 1 during an extension call between slave units.

FIG. 4 is an exemplary view for explaining an operation at the time of an extension call between slave units in a modification of the wireless relay station shown in FIG. 1;

FIG. 5 is a diagram showing a state where a master unit connected to a public network relays an extension call between slave units A and B that can be used as PHS terminals.

FIG. 6 shows one handset A during the extension call relay shown in FIG.
FIG. 7 is a diagram for explaining a problem that occurs when an error occurs in data received from a user.

[Explanation of symbols]

Reference Signs List 110 radio section 111 antenna 112 high frequency switch (SW) 113 reception section 114 frequency synthesizer 115 transmission section 116 reception field strength detection section (RSSI) 120 modem section 121 demodulation section 122 modulation section 130 Channel codec section 131 TDMA decoding section 132 TDMA encoding section 140 Communication section 141 Adaptive differential PCM transcoder (ADPCM-
TRANSCODER) 142 PCM codec (PCM-CODEC) 143 Crosspoint switch 144 Local line circuit 150 Control unit 160 Memory unit 170 User interface unit 171 Display unit 172 Key input unit 180 Handset 181 Speaker 182 … Microphone (M)

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B ⁷ /14-7/22 H04B 7/24-7/26 H04Q 7/00-7/38 H04J 3/00 H04L 1 / 00

Claims (4)

(57) [Claims] 1. A mobile device that can be connected to a communication network and is wirelessly connected.
In a radio relay station capable of performing relay between mobile stations, when performing relay between the mobile stations,
Whether there is an error in the received data received from the mobile station,
Based on the data for determination set in the received data
Error determining means for determining, and the error determining means determining that there is an error in the received data
In this case, the determination data in the received data is
Changes to predetermined judgment data unrelated to the contents of the received data
In other words, data for transmitting the received data to the relay destination mobile station.
Wireless relay comprising data transfer means.
Bureau. 2. The data transfer means according to claim 1 , wherein
If the stage determines that there is an error in the received data,
A data string in which the judgment data in the received data is only "0"
And transmits the received data to the relay destination mobile station.
The radio relay station according to claim 1, wherein: 3. The data transfer means according to claim 2 , wherein
If the stage determines that there is an error in the received data,
A data string in which only the judgment data in the received data is "1"
And transmits the received data to the relay destination mobile station.
The radio relay station according to claim 1, wherein: 4. The data transfer means according to claim 1 , wherein:
If the stage determines that there is an error in the received data,
The determination data in the received data is
The judgment data “0” and “1” used in the error judgment are inverted.
The received data is converted to the
2. The wireless communication system according to claim 1, wherein the transmission is performed to a mobile station.
Line relay station.