JPH09148977A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct radio delay time and to prevent the deviation of reception data from a time slot by generating the transmission timing correction data of a slave machine or a master machine with synchronous word detection time data included in transmission data of the slave machine. SOLUTION: Synchronous word detection time data detected by a slave machine synchronous word detector 24 is included in transmission data from the slave machine 20 to the master machine 10. A master machine radio delay detection part 16 detects the presence or absence of radio delay from data through a master machine radio part 12. When it is present, transmission timing correction data of the slave machine 20 is generated and it is transmitted from a master machine antenna 11 to the slave machine 20 through a master machine control part 15. It is received and demodulated by a slave machine radio part 22 through a salve machine antenna 21 and it is inputted to a slave machine control part 26. The control part 26 controls a slave machine TDMA frame synchronous circuit 25 so that transmission timing is improved based on the input and transmits transmission data to the master machine 10 in accordance with the timing. Thus, radio delay time is corrected and absorbed and therefore the deviation of reception data from the time slot can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to TDMA (time d.
ivision multiple access) / TDD (time divis-ion)
The present invention relates to a wireless communication system such as a mobile phone system and a mobile phone system of a duplex type.

[0002]

2. Description of the Related Art In recent years, digitization of automobile telephone systems and mobile telephone systems has been advanced. In digital mobile communication, a plurality of wireless stations temporally divides one frequency and shares it, and realizes bidirectional transmission on a pair of transmission lines.
The MA / TDD method is predominant.

Conventionally, as a wireless communication system composed of a parent device and a child device, those described in FIGS. 3A and 3B are known. FIG. 3A shows a master device used in communication using the TDMA / TDD system, and FIG.
Indicates a slave unit used in communication using the TDMA / TDD system. In FIG. 3A, the master device 10 includes a master antenna 11, a master wireless unit 12, and a master data processing unit 1.
3, a master unit TDMA frame generation unit 14 and a master unit control unit 15. The base unit antenna 11 transmits and receives radio signals. The base unit radio unit 12 demodulates a radio signal received by the base unit antenna 11 or modulates transmission data. The base unit data processing unit 13 performs analysis processing of the demodulated signal obtained by demodulating the wireless signal in the base unit wireless unit 12, or outputs transmission data to the base unit wireless unit 12. The master TDMA frame generation unit 14 generates a TDMA frame and sets transmission / reception timing. The parent device control unit 15 controls the entire device.

In FIG. 3B, the slave device 20 includes a slave antenna 21, a slave radio unit 22, and a slave data processing unit 2.
3, a slave unit synchronization word detector 24, a slave unit TDMA frame synchronization circuit 25, and a slave unit control unit 26. The slave antenna 21 transmits / receives a wireless signal. The handset wireless unit 22 demodulates a radio signal received by the handset antenna 21 or modulates transmission data. The slave unit data processing unit 23 is the slave unit wireless unit 2
In step 2, the demodulated signal obtained by demodulating the wireless signal is analyzed or the transmission data is output to the slave unit wireless unit 22. The slave unit synchronization word detector 24 detects a synchronization word transmitted between the master unit device 10 and the slave unit device 20 from the demodulated signal. The slave TDMA frame synchronization circuit 25 takes timing of transmission / reception based on the synchronization word detection signal output from the slave synchronization word detector 24. The slave unit control unit 26 controls the slave unit data processing unit 23.

The operation of the wireless communication system configured as described above will be described. When transmitting from the master device 10 to the slave device 20, first, the transmission data is output from the master controller 15 to the master data processor 13. The transmission data is output from the base unit data processing unit 13 to the base unit wireless unit 12 according to the TDMA frame generated by the base unit TDMA frame generation unit 14, modulated by the base unit wireless unit 12, and transmitted from the base unit antenna 11 to the radio wave. The signal is sent to the slave device 20 via the external space. The radio signal transmitted from the master device 10 is received by the slave antenna 21, and the received signal is output from the slave antenna 21 to the slave radio unit 22 and demodulated by the slave radio unit 22 to process the slave data. Part 23
After passing through, the data is input to the child device control unit 26.

When transmitting from the slave device 20 to the master device 10, first, the transmission data is output from the slave controller 26 to the slave data processor 23. The transmission data is synchronized by the slave TDMA frame synchronization circuit 25 based on the synchronization word detection signal from the slave synchronization word detector 24,
Output from the handset data processing unit 23 to the handset wireless unit 22,
The radio signal is modulated by the handset wireless unit 22 and transmitted as a radio signal from the handset antenna 21 to the base unit 10 through the external space. The radio signal transmitted from the slave device 20 is received by the master antenna 11, the received signal is output from the master antenna 11 to the master wireless unit 12, demodulated by the master wireless unit 12, and master data processing is performed. After passing through the unit 13, the master unit control unit 1
5 is input.

FIGS. 4A and 4B show TDMA / TDD.
FIG. 3 is a timing diagram showing ideal transmission / reception timings of a master device and slave devices used in communication using the method. First, as shown in FIG. 4 (a), the parent device determines the time slot Tx.
1 transmits to the slave device, and as shown in FIG. 4B, the slave device receives the signal from the master device in the time slot Rx1. The slave device transmits the signal to the master device at time slot Tx2 after a fixed predetermined time x from the timing when the signal of the master device is received as shown in FIG. 4B, and as shown in FIG. The device receives the signal from the slave device in the time slot Rx2. The fixed predetermined time x is generated by the slave unit synchronization word detector 24 based on the synchronization word detection signal. As described above, in the conventional wireless communication system of the TDMA / TDD system, the transmission time slot and the reception time slot are determined in advance, and the slave device is predetermined based on the reception timing when the signal of the master device is received. Sends after a fixed time.

FIGS. 5A and 5B show TDMA / TDD.
FIG. 6 is a timing diagram showing actual transmission / reception timings of a master device and slave devices used in communication using the method. Also,
FIG. 5C is an enlarged view showing the transmission time slot Tx2 in the slave device of FIG. 5B in an enlarged manner, and various data is inserted between the guard bits. First, as shown in FIG. 5A, the parent device transmits to the child device at time slot Tx1, and as shown in FIG. 5B, the child device receives the signal from the parent device at time slot Rx1. To do. As shown in FIG. 5B, the slave device receives the time slot Tx after a fixed predetermined time x from the timing when the signal of the master device is received.
In step 2, it is transmitted to the master device.

[0009]

However, in the above-mentioned conventional wireless communication system, the master device 10 and the slave device 2 are used.
When the communication distance to 0 is long, as shown in FIG. 5A, a delay (wireless delay) occurs in the wireless space from the ideal reception time slot Rx2. If this radio delay time is long, the guard bit in each slot (see FIG.
In (c), it becomes impossible to cover the timing shift due to the delay, and the transmission data from the slave device 20 arrives beyond the reception time slot timing of the master device 10, so that the master device 10 receives the data. It had a problem that it could not. It should be noted that although a radio delay occurs when going from the master device 10 to the slave device 20, it is omitted in FIG. 5 for simplification.

In this wireless communication system, it is required to prevent time slot deviation of received data due to wireless delay.

It is an object of the present invention to provide a wireless communication system capable of preventing time slot deviation of received data due to wireless delay.

[0012]

In order to solve this problem, the present invention comprises a master device and a slave device, and TDMA / TDD system communication by radio signals between the master device and the slave device. Which is a wireless communication system for
A master unit antenna that transmits and receives wireless signals, a master unit wireless unit that demodulates the wireless signal received by the master unit antenna or modulates transmission data, and a demodulated signal obtained by demodulating the wireless signal in the master unit wireless unit Of the master unit, a master unit data processing unit that performs analysis processing of the master unit or outputs transmission data to the master unit wireless unit, a master unit wireless delay detection unit that detects a delay time in a wireless space from a demodulated signal, and a TDMA
A base unit TDMA frame generation unit that generates a frame and controls transmission / reception timing, and a base unit control unit that controls the whole and generates a control message that controls the transmission timing of the slave unit from the delay time in the wireless space. And a slave device, the slave device transmitting and receiving a radio signal, and a slave device,
A slave wireless unit that demodulates a wireless signal received by a slave antenna or modulates transmission data, and an analysis process of a demodulated signal obtained by demodulating a wireless signal by the slave wireless unit or a slave wireless unit Output from the slave unit data processing unit that outputs the transmission data, the slave unit synchronization word detector that detects the synchronization word transmitted between the master unit and the slave unit from the demodulated signal, and the slave unit synchronization word detector The slave unit TDMA frame synchronization circuit that controls the transmission / reception timing based on the synchronized word detection signal, and the slave unit data processing unit and the slave unit TDMA frame synchronization circuit are controlled, and the transmission timing is controlled by receiving the control message. And a slave unit control unit.

As a result, it is possible to obtain a wireless communication system capable of preventing time slot deviation of received data due to wireless delay.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a master device and a slave device, and performs TDMA / TDD system communication by a radio signal between the master device and the slave device. In the wireless communication system, the master device includes a master antenna that transmits and receives radio signals, a master wireless unit that demodulates a wireless signal received by the master antenna or modulates transmission data, and a master wireless device. Unit processing unit that analyzes the demodulated signal obtained by demodulating the radio signal in the unit or outputs the transmission data to the base unit wireless unit, and the base unit that detects the delay time in the radio space from the demodulated signal A master unit TD that generates a TDMA frame and controls transmission / reception timing with a wireless delay detection unit
It has an MA frame generator and a master unit controller that controls the transmission timing of the slave unit based on the delay time in the wireless space for controlling the whole and the slave unit transmits the wireless signal. A slave antenna for transmission and reception, a slave wireless unit that demodulates a wireless signal received by the slave antenna or modulates transmission data, and an analysis process of a demodulated signal obtained by demodulating a wireless signal in the slave wireless unit. Alternatively, a slave unit data processing unit that outputs transmission data to the slave unit wireless unit, a slave unit synchronization word detector that detects a synchronization word transmitted between the master unit and the slave unit from the demodulated signal, and a slave unit. And a control message for controlling the slave unit TDMA frame synchronization circuit, which controls the transmission / reception timing based on the synchronization word detection signal output from the device synchronization word detector, and the slave unit data processing unit and the slave unit TDMA frame synchronization circuit. Is obtained by a to have a slave machine control unit for controlling the transmission timing by receiving the di, has the effect of radio delay time is corrected absorbed by the control message.

According to a second aspect of the present invention, in the first aspect of the present invention, the parent device performs the entire control instead of the parent device control unit of the first aspect, and the parent device wireless delay detection unit. A master unit control unit for controlling the transmission timing of the transmission data of the transmission slot based on the delay time data from the slave unit controller is provided, and the slave unit control device replaces the slave unit control unit according to claim 1 with a slave unit data processing unit. A slave unit control unit that controls the transmission timing of the slave unit based on the transmission timing of the master unit is provided, and the wireless delay time is corrected and absorbed by controlling the transmission timing of the master unit. Has the effect of being.

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. (Embodiment 1) FIGS. 1A and 1B are block diagrams showing a master device 10 and a slave device 20 of a wireless communication system according to an embodiment of the present invention. In FIG. 1A,
Base unit antenna 11, base unit wireless unit 12, base unit data processing unit 13, base unit TDMA frame generation unit 14, base unit control unit 1
5 is the same as that shown in FIG.
The master wireless delay detection unit 16 detects whether or not there is a delay (wireless delay) in the wireless space due to a large distance from the slave device 20, and if there is, a wireless delay time (wireless delay). Time). In FIG. 1B, a slave antenna 21, a slave radio unit 22, a slave data processing unit 23,
The slave unit synchronization word detector 24, the slave unit TDMA frame synchronization circuit 25, and the slave unit control unit 26 are the same as those in FIG. That is, the slave device 20 shown in FIG. 1B has the same configuration as the slave device 20 shown in FIG. 3B, but from the slave controller 26 of FIG. 1B to the slave TD.
As shown by the line going to the MA frame synchronization circuit 25, the slave unit control unit 26 controls the slave unit TDMA frame synchronization circuit 25, which is different from FIG. 3B.

The operation of the radio communication system configured as above will be described. First, the transmission data is output from the parent device control unit 15 to the parent device data processing unit 13. This transmission data is transmitted by the base unit data processing unit 1 according to the TDMA frame generated by the base unit TDMA frame generation unit 14.
3 is output to the base unit radio unit 12, modulated by the base unit radio unit 12, and transmitted from the base unit antenna 11 as a radio signal to the handset device 20 via the external space. The radio signal transmitted from the master device 10 is received by the slave antenna 21, and the received signal is output from the slave antenna 21 to the slave radio unit 22 and demodulated by the slave radio unit 22 to process the slave data. After passing through the section 23, it is input to the slave unit control section 26.

Next, the transmission data is output from the handset device controller 26 to the handset device data processor 23. This transmission data is
The slave TDMA frame synchronization circuit 25 synchronizes on the basis of the sync word detection signal from the slave unit synchronization word detector 24, and the slave unit data processing unit 23 outputs the synchronization signal to the slave unit wireless unit 22. And is transmitted to the master device 10 as a radio signal from the slave antenna 21 via the external space. The radio signal transmitted from the slave device 20 is received by the master antenna 11, and the received signal is received by the master antenna 1.
1 is output to the base unit wireless unit 12, demodulated by the base unit wireless unit 12, passed through the base unit data processing unit 13, and then input to the base unit control unit 15.

The transmission data transmitted to the master device 10 includes, as data, the synchronization word detection time (fixed predetermined time x shown in FIG. 5B) detected by the slave device synchronization word detector 24. The synchronization word detection time data is output from the base unit wireless unit 12 to the base unit wireless delay detection unit 16. The master wireless delay detection unit 16 detects the presence or absence of wireless delay from the synchronization word detection time data, and when it determines that there is wireless delay, generates correction data for the transmission timing of the slave device 20, and the master unit control unit 15 Output to. Next, the transmission data including the correction data of the transmission timing of the slave device 20 is output from the master device controller 15 to the master device data processor 13, and according to the TDMA frame generated by the master device TDMA frame generator 14. The data is output from the base unit data processing unit 13 to the base unit wireless unit 12, modulated by the base unit wireless unit 12,
The radio signal is transmitted from the base station antenna 11 to the handset device 20 through the external space. The radio signal transmitted from the master device 10 is received by the slave antenna 21, and the received signal is output from the slave antenna 21 to the slave wireless unit 22,
The data is demodulated by the handset wireless unit 22, passed through the handset data processing unit 23, and then input to the handset control unit 26.

Next, the transmission data is output from the slave unit control unit 26 to the slave unit data processing unit 23. On the other hand, the child device 20
Of the slave unit control unit 26 based on the correction data of the transmission timing of
Controls the slave TDMA frame synchronization circuit 25 so as to advance the transmission timing. According to the timing, the transmission data is output from the handset data processing unit 23 to the handset radio unit 22, modulated by the handset radio unit 22, and then the handset antenna 21.
Is transmitted to the parent device 10 as a radio signal via the external space.

In the above embodiment, the master device 10
Although the reception time slot in the above has been described, the same applies to the reception time slot in the slave device 20 when transmitting from the slave device 20.

As described above, according to this embodiment, the correction data of the transmission timing of the slave unit 20 is generated based on the synchronization word detection time data included in the transmission data from the slave unit 20, and this correction is performed. Child device 20 according to data
Since the transmission timing is controlled, if a wireless delay time occurs between the master device 10 and the slave device 20, the wireless delay time can be absorbed by the correction, and reception by the wireless delay can be performed. It is possible to prevent data from being out of time slot.

(Second Embodiment) FIGS. 2A and 2B show a master device 10 and a slave device 20 of a wireless communication system according to a second embodiment of the present invention. In FIG. 2A,
Base unit antenna 11, base unit wireless unit 12, base unit data processing unit 13, base unit TDMA frame generation unit 14, base unit control unit 1
5. The master unit wireless delay detection unit 16 is the same as that shown in FIG. That is, although the master device 10 shown in FIG. 2A has the same configuration as the master device 10 shown in FIG. 1A, the master device control unit 15 shown in FIG.
As shown by the line going to the DMA frame generation unit 14, the base unit control unit 15 controls the base unit TDMA frame generation unit 14, which is different from FIG. In FIG. 2B,
The slave unit antenna 21, slave unit wireless unit 22, slave unit data processing unit 23, slave unit synchronization word detector 24, slave unit TDMA frame synchronization circuit 25, and slave unit control unit 26 are the same as those in FIG. 1B. , Description is omitted. That is, the slave unit 20 shown in FIG. 2B has the same configuration as the slave unit 20 shown in FIG. 1B, but the slave TDMA frame synchronization circuit 25.
Is not controlled by the child device control unit 26, which is different from FIG.

The operation of the wireless communication system configured as described above will be described. First, the transmission data is output from the parent device control unit 15 to the parent device data processing unit 13. This transmission data is transmitted by the base unit data processing unit 1 according to the TDMA frame generated by the base unit TDMA frame generation unit 14.
3 is output to the base unit radio unit 12, modulated by the base unit radio unit 12, and transmitted from the base unit antenna 11 as a radio signal to the handset device 20 via the external space. The radio signal transmitted from the master device 10 is received by the slave antenna 21, and the received signal is output from the slave antenna 21 to the slave radio unit 22 and demodulated by the slave radio unit 22 to process the slave data. After passing through the section 23, it is input to the slave unit control section 26.

Next, the transmission data is output from the slave unit control unit 26 to the slave unit data processing unit 23. This transmission data is
The slave TDMA frame synchronization circuit 25 synchronizes on the basis of the sync word detection signal from the slave unit synchronization word detector 24, and the slave unit data processing unit 23 outputs the synchronization signal to the slave unit wireless unit 22. And is transmitted to the master device 10 as a radio signal from the slave antenna 21 via the external space. The radio signal transmitted from the slave device 20 is received by the master antenna 11, and the received signal is received by the master antenna 1.
1 is output to the base unit wireless unit 12, demodulated by the base unit wireless unit 12, passed through the base unit data processing unit 13, and then input to the base unit control unit 15.

The transmission data transmitted to the master device 10 includes, as data, the synchronization word detection time (fixed predetermined time x shown in FIG. 5B) detected by the slave device synchronization word detector 24. The synchronization word detection time data is output from the base unit wireless unit 12 to the base unit wireless delay detection unit 16. The base unit wireless delay detection unit 16 detects the presence or absence of a wireless delay from the synchronization word detection time data, and when it determines that there is a wireless delay, generates correction data for the transmission timing of the base unit 10, and the base unit control unit 15 Output to. Next, the transmission data is output from the parent device control unit 15 to the parent device data processing unit 13. On the other hand, based on the correction data of the transmission timing of the master device 10, the master controller 15 controls the master TDMA frame generator 14 so as to accelerate the transmission timing. According to the timing, the transmission data is output from the base unit data processing unit 13 to the base unit wireless unit 12, and the base unit wireless unit 1
It is modulated by 2 and transmitted from the base unit antenna 11 as a radio signal to the handset device 20 through the external space. Base unit 1
The radio signal transmitted from the slave unit 0 is received by the slave unit antenna 21, and the received signal is transmitted from the slave unit antenna 21 to the slave unit wireless unit 2.
2, is demodulated by the slave unit radio unit 22, passes through the slave unit data processing unit 23, and then is input to the slave unit control unit 26. Next, the transmission data is output from the child device control unit 26 to the child device data processing unit 23. This transmission data is synchronized by the slave unit TDMA frame synchronization circuit 25 based on the synchronization word detection signal from the slave unit synchronization word detector 24, and output from the slave unit data processing unit 23 to the slave unit wireless unit 22. The radio signal is modulated by the handset wireless unit 22 and transmitted as a radio signal from the handset antenna 21 to the base unit 10 through the external space.

In the above embodiment, the master device 10 is used.
Although the reception time slot in the above has been described, the same applies to the reception time slot in the slave device 20 when transmitting from the slave device 20.

As described above, according to this embodiment, the correction data of the transmission timing of the master device 10 is generated based on the synchronization word detection time data included in the transmission data from the slave device 20, and this correction is performed. Base unit 10 according to data
Since the transmission timing is controlled, if a wireless delay time occurs between the master device 10 and the slave device 20, the wireless delay time can be absorbed by the correction, and reception by the wireless delay can be performed. It is possible to prevent data from being out of time slot.

[0029]

As described above, according to the wireless communication system of the present invention, the correction data of the transmission timing of the slave unit or the master unit is based on the synchronization word detection time data included in the transmission data from the slave unit. Since it is possible to control the transmission timing of the slave device or the master device by this correction data, when the wireless delay time occurs between the master device and the slave device, The radio delay time can be absorbed by the correction, and the advantageous effect that the time slot deviation of the received data due to the radio delay can be prevented can be obtained.

[Brief description of the drawings]

FIG. 1A is a block diagram showing a master device of a wireless communication system according to an embodiment of the present invention. FIG. 1B is a block diagram showing a slave device of a wireless communication system according to an embodiment of the present invention.

FIG. 2A is a block diagram showing a master device of a wireless communication system according to a second embodiment of the present invention. FIG. 2B is a block diagram of a slave device of a wireless communication system according to the second embodiment of the present invention. Block Diagram

FIG. 3A is a block diagram showing a master device of a conventional wireless communication system. FIG. 3B is a block diagram showing a slave device of a conventional wireless communication system.

FIG. 4 is a timing diagram showing ideal timing in the master device and ideal timing in the slave device.

FIG. 5 is an explanatory diagram showing an actual timing in a master device, an actual timing in a slave device, and an enlarged transmission time slot in a slave device.

[Explanation of symbols]

 10 parent device 11 parent antenna 12 parent wireless unit 13 parent data processing unit 14 parent TDMA frame generation unit 15 parent device control unit 16 parent wireless delay detection unit 20 child device 21 child antenna 22 child wireless 23 Handset data processing unit 24 Handset synchronization word detector 25 Handset TDMA frame synchronization circuit 26 Handset control unit

Claims (2)

[Claims] 1. A TDMA / TDD comprising a master unit and a slave unit, and a radio signal between the master unit and the slave unit.
A wireless communication system for performing communication according to the method, wherein the master device is a master antenna that transmits and receives a radio signal, and a master wireless that demodulates a radio signal received by the master antenna or modulates transmission data. Unit, a master unit data processing unit that performs analysis processing of a demodulated signal obtained by demodulating a radio signal in the master unit wireless unit or outputs transmission data to the master unit wireless unit, and a wireless space from the demodulated signal. A master wireless delay detecting unit for detecting a delay time in the master unit, a master TDMA frame generating unit for generating a TDMA frame and timing of transmission / reception, and overall control and a transmission timing of the slave device. And a slave unit antenna that creates a control message from the delay time in the wireless space, and the slave unit has a slave antenna that transmits and receives a wireless signal and a slave antenna that is received by the slave antenna. A slave unit wireless unit that demodulates a signal or modulates transmission data, and an analysis process of a demodulated signal obtained by demodulating a wireless signal in the slave unit wireless unit, or output of transmission data to the slave unit wireless unit A slave unit data processing unit, a slave unit synchronization word detector for detecting a synchronization word transmitted between the master unit device and the slave unit device from the demodulated signal, and output from the slave unit synchronization word detector. Slave device TDMA frame synchronization circuit for timing transmission / reception based on a sync word detection signal, the slave device data processing unit, and the slave device TDM.
A wireless communication system having a slave unit controller that controls the A frame synchronization circuit and receives the control message to control the transmission timing. 2. The master device performs the overall control instead of the master controller, and determines the transmission timing of the transmission data of the transmission slot based on the delay time data from the master wireless delay detector. A master device control unit for controlling is provided, and the slave device control device controls the slave device data processing unit in place of the slave device control unit, and the slave device device is based on the transmission timing of the master device. The wireless communication system according to claim 1, further comprising: a slave unit control unit that controls the transmission timing of the.