JP2809750B2 - Transmission timing acquisition method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial Application Field) The present invention relates to a multi-directional wireless communication system using a terrestrial microwave line, such as a single master station and a plurality of slave stations. The present invention relates to a transmission timing acquisition method used for correcting a transmission timing of a slave station in a time division multiple access wireless communication system in which wireless communication is performed by using a burst signal between the mobile stations.

(Prior Art) In recent years, various communication systems have been developed with the development of communication technology and diversification of communication needs. Among them, wireless communication employing a time division multiple access (TDMA) method has been developed. There is a system. FIG. 9 shows an example of the configuration. This system comprises one master station A and a plurality of slave stations B1 to Bn arbitrarily distributed.
Then, a time division multiplexed signal (TDM signal) composed of a continuous wave is transmitted from the master station A to each of the slave stations B1 to Bn, for example, as shown in FIG. 10, and an eleventh signal is sent from the slave stations B1 to Bn to the master station A. As shown in the figure, each of the slave stations B1 to Bn is a time slot assigned to its own station.
By transmitting a data signal composed of a burst wave to TS1 to TSn, data communication is performed between the master station A and each of the slave stations B1 to Bn.

By the way, in this type of system, since the distance between the master station A and each of the slave stations B1 to Bn differs for each slave station, a difference occurs in the propagation time of the radio signal. For this reason, in each of the slave stations B1 to Bn, it is necessary to adjust the transmission timing for each slave station to set the optimum timing so that the transmission signals do not overlap each other in the master station A. Further, even if the optimal timing is set once, the transmission timing changes due to a change in the temperature characteristic of the circuit element during operation.

Therefore, recently, the following transmission timing acquisition method has been considered. That is, each of the slave stations B1 to Bn
For example, a control slot is provided in the TDMA signal transmitted to the TDMA signal as shown in FIG. Then, when the slave station Bi is newly installed or in operation, a burst signal for adjustment is transmitted from the slave station Bi to the master station A using the control slot. On the other hand, the master station A detects the amount of deviation from the normal reception timing of the burst signal for adjustment, and
The detection result of the deviation amount is notified from the master station A to the slave station Bi using the control slot of the TDM signal (FIG. 10). Slave station Bi
Then, the maintenance staff can manually operate the switches in accordance with the notified shift amount, or provide automatic adjustment means and operate the automatic adjustment means in accordance with the shift amount. Adjust the transmission timing.

(Problems to be Solved by the Invention) However, such a transmission timing acquisition method has the following problems. That is, in this transmission timing acquisition method, even during the transmission timing acquisition control period,
The slave stations transmit data burst signals in parallel. Further, the transmission timing capture control is repeatedly performed a plurality of times until the timing correction is completed when the amount of deviation of the transmission timing is large or when the state of the line is unstable. For this reason, the capture operation period of the transmission timing may be long. Therefore, if the data burst signal is transmitted during the transmission timing capturing operation as described above, the data burst signal may be continuously transmitted at an incorrect transmission timing for a long time in some cases. In such a state, the master station receives the data burst signal transmitted from the slave station whose transmission timing is shifted while partially overlapping the data burst signal transmitted from another slave station. For this reason, the transmission quality of the slave station whose transmission timing is shifted is degraded, and the transmission quality of another slave station is also deteriorated. In the worst case, the other slave station may be disconnected. Very unfavorable.

In some slave stations, data transmission control and transmission timing capture control are performed by a common processor. In such a slave station, transmission timing acquisition control is performed between data transmission controls, so that there is a problem that it takes a relatively long time to complete the correction of the transmission timing.

Therefore, the present invention focuses on such a situation, and in a state where the shift amount of the transmission liming exceeds the allowable amount, the data burst signal is not transmitted from the slave station as much as possible,
Accordingly, it is an object of the present invention to provide a transmission timing acquisition method capable of reducing an adverse effect on a data transmission operation of another slave station and improving the efficiency of transmission timing acquisition control.

[Configuration of the Invention] (Means for Solving the Problems) The present invention relates to a time division multiple access wireless communication system for performing wireless communication using a burst signal between one master station and a plurality of slave stations, Transmission means for transmitting a timing acquisition signal to a master station within a control slot provided in the transmission frame. The master station receives the timing acquisition signal from the slave station and corrects the reception timing. Detection notification means for detecting a deviation amount with respect to the reception timing of the slave station, and notifying a timing adjustment control signal corresponding to the detection result to the slave station which has transmitted the timing acquisition signal. Transmission timing acquisition control means for adjusting the transmission timing of its own station so as to make the deviation amount zero according to the timing adjustment control signal provided, the transmission means, and the detection notification In the transmission timing control process by the means and the transmission timing acquisition control means, it is determined whether the deviation amount of the reception timing notified from the master station exceeds an allowable amount, and it is determined that the deviation exceeds the allowable amount. In this case, at least the burst transmission stop control means for stopping the transmission of the data burst signal to the master station until the shift amount of the reception timing notified from the master station decreases to within a predetermined amount. is there.

Further, according to the present invention, in a time division multiple access wireless communication system for performing wireless communication using a burst signal between one master station and a plurality of slave stations, the slave station is provided with a control provided to the master station in its transmission frame. The master station receives the timing acquisition signal from the slave station, detects the amount of deviation of the reception timing from the normal reception timing, and A timing adjustment control signal corresponding to the detection result is notified to the slave station that has transmitted the timing acquisition signal, and it is determined whether or not the amount of deviation from the reception timing exceeds an allowable value. When the value exceeds the allowable value, the transmission stop instruction information for stopping the transmission of the data burst signal is transmitted together with the timing adjustment control signal to the timing. The slave station is provided with detection notifying means for notifying the slave station that has transmitted the signaling for capturing a signal, and the slave station adjusts the transmission timing of its own station so as to make the deviation amount zero according to the timing adjustment control signal notified from the master station. It is configured to include timing acquisition control means and burst transmission stop control means for stopping transmission of a data burst signal to the master station when the transmission stop instruction information is received from the master station.

(Operation) As a result, according to the present invention, if it is determined in the process of controlling the transmission timing of the slave station that the deviation amount of the transmission timing exceeds the allowable amount, at least the deviation amount is equal to the allowable amount. During this period, the transmission of the data burst signal from the slave station is stopped. That is, in the case of a slave station whose transmission timing deviation exceeds the allowable amount, the data transmission operation is not performed during the transmission timing capture control period. Therefore, the deterioration of the transmission quality of the other slave stations during this period is prevented, and even if the time until the correction of the transmission timing is extended becomes longer, the other slave station reaches the line disconnection state during this time. Don't worry. Further, in the transmission timing capture control period, only data transmission control is performed without performing data transmission, so that the processor of the slave station can execute only transmission timing capture control. Therefore, it is possible to improve the efficiency of transmission timing capture control and reduce the time required for correction.

(Embodiment) FIG. 1 shows a configuration of a master station and a slave station to which a transmission timing holding method according to an embodiment of the present invention is applied. In the figure, only one of the plurality of slave stations is shown for convenience of explanation.

First, the master station AA includes a radio circuit terminating device 10, a modulation / demodulation device 11 for modulating / demodulating a transmission / reception signal, a radio transmission / reception device 13 having an antenna 12, an input operation unit such as a key switch, and an output display unit such as a display. Console 14 is provided.

The radio circuit terminating device 10 includes a multiplexing unit 15 and a demultiplexing unit 16 for multiplexing a transmission signal and demultiplexing a received TDMA signal, and is connected to the multiplexing unit 15 and the demultiplexing unit 16 via a signal bus. And a plurality of interfaces 17
Terminals are connected to these interfaces 17 via a line 18.
19 are connected respectively. In addition, the radio circuit terminator 10
Is a control unit 20 and a non-volatile memory such as an E ² PROM
21.

The control unit 20 includes, for example, a microcomputer as a main control unit.In addition to the control unit related to the normal data transmission operation, the phase shift information transmission control unit 20a used when capturing the transmission timing of the slave station BB. Bit shift information transmission control means 20b and timing hold control means 20c
And

When setting the transmission timing of the slave station BB, the phase shift information transmission control means 20a issues an instruction for adjusting the phase shift of the transmission timing to the slave station BB, and then sets the phase transmitted from the slave station BB. This is to notify the slave station BB of the phase shift information of the adjustment burst signal and cause the slave station BB to adjust the phase of the transmission timing.

After the adjustment of the phase shift by the phase shift information transmission control means 20a is completed, the bit shift information transmission control means 20b issues an instruction for adjusting the bit shift to the slave station BB, and then sends the instruction from the slave station BB. Notify the slave station BB of the bit shift information of the burst shift signal for adjusting the bit shift, and notify the slave station BB.
To adjust the transmission timing on a bit-by-bit basis. The phase shift of the phase adjustment burst signal and the bit shift of the bit shift adjustment burst signal are as follows.
Each of them is detected by the shift detecting means 16a provided in the separation unit 16.

The timing holding control means 20c periodically transmits the phase shift information transmission control means 20 to all the operating slave stations.
a and operating the bit shift information transmission control means 20b,
The transmission timing of each slave station is corrected.

FIG. 2 shows the frame structure of the TDM signal transmitted from the master station AA to the slave station BB. This TDM signal has a synchronization bit F and a plurality of data transmission time slots as shown in FIG. A control slot is arranged between TS1 to TSn, and a timing adjustment control signal is transmitted using a part of the control slot. This timing adjustment control signal is composed of bits for inserting the identification number ID of the slave station, the instruction information CONT to the slave station, the phase shift information, the bit shift information, and the preliminary information as shown in FIG.
FIG. 3C shows data transmission time slots TS1 to TSn.
F indicates a synchronization bit, ID indicates an identification number of a slave station, SV indicates a maintenance bit, H indicates data, and P indicates a parity bit.

On the other hand, the slave station BB also includes a radio line terminating device 30, a modem 31, a radio transmitting / receiving device 33 having an antenna 32, and a console 34, like the parent device AA. The wireless line terminating device 30 includes a multiplexing unit 35 that multiplexes transmission data and control signals, a demultiplexing unit 36 that separates a signal addressed to the own station from a TDM signal sent from the master station AA, Department
It has a plurality of interfaces 37 connected to the separation unit 35 and the separation unit 36 via a signal bus. Terminal devices 39 are connected to these interfaces 37 via lines 38, respectively. Further, the radio line terminating device 30 includes a control unit 40
And a non-volatile memory 41 composed of, for example, an E ² PROM, and a transmission timing variable unit. Among them, the transmission timing variable section 42 is firstly composed of a phase shift circuit 42a for varying the transmission phase of the transmission signal, and a bit delay circuit 42b for varying the transmission timing of the transmission signal in bit units.

The control unit 40 includes, for example, a microcomputer as a main control unit.In addition to the control unit related to the normal transmission / reception operation, a phase shift adjustment control unit 40a used when capturing transmission timing, and a bit shift adjustment Control means 40b
And burst transmission stop control means 40c.

The phase shift adjustment control means 40a operates when a phase adjustment instruction is sent from the master station AA, and sends a phase adjustment burst signal to the master station AA using the control slot of the TDMA frame. On the other hand, when phase shift information is sent from the master station AA, the phase shift amount of the phase shift circuit 42a is variably controlled according to this information.

The bit shift adjustment control means 40b operates when a bit shift adjustment instruction is sent from the master station AA, and
A bit adjustment burst signal is transmitted using the control slot of the TDMA frame, and when bit shift information is sent from the master station AA, the delay amount of the bit delay circuit 42b is varied according to this information. To control.

Finally, the burst transmission stop control unit 40c, during the bit shift adjustment by the bit shift adjustment control unit 40b,
It is determined whether or not the bit shift amount sent from A exceeds a predetermined allowable amount. When the bit shift amount exceeds the allowable amount, the transmission of the data burst signal is stopped at that point, and this transmission stop state is maintained until the adjustment of the transmission timing is completed.

FIG. 3 shows a frame structure of a TDMA signal transmitted from each of the slave stations configured as described above to the master station AA. This signal starts at the control slot AQ as shown in FIG. And then each time slot TS for data transmission
1 to TSn are arranged. The burst signal for phase adjustment and the burst signal for bit adjustment are selectively transmitted using a part of the control slot AQ.
The burst signal for phase adjustment is, as shown in FIG.
It consists of a repetition signal of "10" (36 bits). The burst signal for bit adjustment is composed of a predetermined synchronization pattern (SYNC pattern) and the identification number ID of the slave station as shown in FIG. FIG. 2D shows the configuration of the data transmission time slots TS1 to TSn, where G is a guard bit,
ID is the slave station identification number, SV is the maintenance bit, H is the data,
P indicates a parity bit.

Next, a transmission timing acquisition method according to the present embodiment based on the above configuration will be described. It is assumed that the transmission timing of each operating slave station has already been set to an optimum value once by initial timing acquisition at the time of installation.

The control unit 20 of the master station AA monitors the operating time of each operating slave station. In this state, for example, if it is assumed that a certain period of time (for example, several minutes) has elapsed after the initial capture of the transmission timing, for example, the operation time of the slave station BB, the control unit of the master station AA
20 starts the capture control of the transmission timing for the slave station BB. That is, the control unit 20 of the master station AA first creates a timing adjustment control signal for adjusting the phase shift. FIG. 4 shows the configuration, in which the ID number of the slave station BB is inserted into the ID number bit, and the first bit of the 4-bit instruction information, that is, the adjustment type bit corresponds to the phase adjustment instruction. At the same time as setting to “0”, the last bit of the instruction information, that is, the adjustment start end bit is set to “0” corresponding to the adjustment start instruction. Then, the control signal is
At 15, the signal is inserted into the TDM signal control slot and transmitted to the slave station BB. At this time, other areas of the TDM signal control slot and the data transmission time slots TS1 to TS1
Control signals and data destined for the existing slave stations are multiplexed and transmitted to Sn.

On the other hand, the control unit 40 of the slave station BB monitors the arrival of the timing adjustment control signal addressed to the own station while performing normal data transmission / reception control. In this state, the timing adjustment control addressed to the own station from the master station AA is performed. When the signal is sent, the instruction content of the master station AA is first recognized from the instruction information of the control signal.
Since the phase adjustment instruction bit is now "0", the instruction is recognized as phase adjustment, and control for adjusting the phase shift is started thereafter. That is, first, at the transmission timing set in the transmission timing variable unit 42 at the present time,
The burst signal for phase adjustment shown in FIG. 3B is inserted into the control slot AQ of the TDMA frame and transmitted.

On the other hand, after transmitting the timing adjustment control signal, the master station AA determines the regular timing of this reception timing from the reception timing of the phase adjustment burst signal inserted in the control slot of the TDMA signal coming from the slave station BB. The amount of phase shift with respect to the reception timing is detected by the shift detecting means 16a. If a phase shift is detected, the control unit 20 obtains a phase correction value from the phase shift amount, and converts the phase correction value into a phase shift information bit of the timing adjustment control signal shown in FIG. 2 (b). And send it out to slave station BB. For example, if the reception timing of the burst signal (a) for phase adjustment is 5/20 bits behind the normal reception timing (b) as shown in FIG.
Must be advanced by 5/20 bits.
The control unit 20 sends a phase correction value of “−5/20 bits” to the slave station BB. Incidentally, the phase shift information is represented by 8 bits as shown in FIG. 2 (b), and the leading one bit is-, +
, And m / 20 is represented by the remaining 7 bits. In this case, a phase correction value of “10000101” is sent to the slave station BB.

Then, when the master station AA sends the phase correction value addressed to the own station, the control unit 40 of the slave station BB adds the above correction value −5/20 bits to the current setting value of the phase shift amount, and the phase shift circuit The phase shift amount of 42a is corrected to the above addition result. The transmission phase of the slave station is
In AA, adjustment is made so that the phase difference with respect to the reference phase becomes zero.

After the phase correction, the slave station BB sends a burst signal for phase adjustment to the master station AA again with the corrected phase. Then, when the phase correction value is delayed again from the master station AA, the phase shift amount of the phase shift circuit 42a is readjusted according to the phase correction value, and thereafter, the phase difference of the master station AA becomes zero. Repeat the above operations up to.

Now, when the phase difference becomes zero by the above phase adjustment, the master station AA rewrites the phase shift amount stored in the nonvolatile memory 21 to the new phase shift amount set in the slave station BB by the above phase adjustment. Thereafter, as shown in FIG. 6, the adjustment type bit of the 4-bit instruction information is set to "1" corresponding to the bit adjustment instruction, and this control signal is transmitted to the slave station BB. On the other hand, when the control signal instructing the bit adjustment comes from the master station AA, the slave station BB determines that the phase adjustment has been completed, and first determines the non-volatile memory similarly to the master device AA.
The old phase shift amount stored in 41 is rewritten to the new phase shift amount, and then control for bit adjustment is started.
That is, first, the control unit 40 generates a bit adjustment burst signal including a predetermined synchronization pattern and the ID number of the own station as shown in FIG. 3C, and multiplexes this signal into the control slot AQ of the TDMA frame. It is inserted by the conversion unit 35 and transmitted to the master station AA.

When the master station AA receives the bit adjustment burst signal from the slave station BB, the master station AA detects the shift detecting means 16a of the separation unit 16.
Thus, the amount of bit deviation from the normal reception timing is detected from the reception timing of the synchronization pattern. If a bit shift is detected, the control unit 20 obtains a bit shift correction value for reducing the bit shift amount to zero, and uses the correction value as a timing adjustment control signal shown in FIG. 2 (b). Of the slave station BB
Send to. For example, if the reception timing (a) of the bit adjustment burst signal is 9 bits earlier than the normal reception timing (b) as shown in FIG. 7, the transmission timing of the slave station BB needs to be delayed by 9 bits. Therefore, the control unit 30 sends a bit correction value of “+9 bits” to the slave station BB. It should be noted that the bit shift information is also represented by 8 bits similarly to the phase shift information,
Since the leading one bit represents-and +, and the remaining seven bits represent the bit shift amount, a bit correction value of "00001001" is sent to the slave station BB in this case.

On the other hand, when the slave station BB receives a bit correction value (+9 bits) addressed to itself from the master station AA, the slave station BB first compares the bit correction value with a preset allowable value (the number of guard bits). , It is determined whether or not the bit correction value exceeds the allowable value. If it is determined that the bit correction value exceeds the allowable value as a result of this determination, a transmission stop signal is output to the multiplexing unit 35 at this time, thereby stopping the transmission of the data burst signal. If the bit correction value does not exceed the allowable value, the master station AA determines that the data burst signal does not overlap, and continues transmission of the data burst signal. Therefore, the data transmission efficiency does not decrease.

After terminating the transmission stop control of the data burst signal, the slave station BB then sets the delay amount of the bit delay circuit 42b to the currently set value according to the bit correction value (+9 bits) sent from the master station AA. Is further delayed by 9 bits. Thus, the transmission timing of the slave station BB is adjusted in the master station AA so that the bit shift becomes zero with respect to the reference timing. Then, the slave station BB transmits the bit adjustment burst signal to the master station AA again at the transmission timing after the bit shift correction. On the other hand, when the master station AA confirms that there is no bit shift from the reception timing of the bit adjustment burst signal retransmitted from the slave station BB, the non-volatile memory
The old bito delay amount stored in 21 is rewritten to the new bit delay amount set in the slave station BB, and the adjustment start end bit of the instruction information of the timing adjustment control signal is adjusted as shown in FIG. It is set to "1" corresponding to the end instruction and transmitted to the slave station BB. Then, the slave station BB recognizes that the adjustment of the transmission timing is completed from “1” of the adjustment start end bit, and sets the old setting value of the nonvolatile memory 41 to the new delay amount set in the bit delay circuit 42b. To be rewritten.

Then, the multiplexing unit 35 that has been in the transmission stop state during the above-described bit shift correction period is returned to the operating state, and thereafter, data transmission is restarted according to the transmission timing newly set in the nonvolatile memory 41.

Thus, the transmission timing of the slave station BB is corrected to an optimal value. In addition, about the transmission timing of this slave station BB,
Thereafter, each time the predetermined time (for example, several minutes) elapses, the correction is periodically performed according to the adjustment procedure.

In addition, the master station AA also corrects the transmission timing of the other operating slave stations at regular intervals, as in the case of the slave station BB.

Thus, according to the present embodiment, in the bit shift correction process, it is determined whether or not the bit correction value sent from the master station AA in the slave station exceeds the allowable value. Stops the transmission of the data burst signal at that time, and holds this transmission stop state until the correction of the transmission timing is completed, so if the bit shift amount exceeds the allowable value, during the bit correction period , The transmission of the data burst signal is stopped. Therefore, during this period, there is no concern that the data burst signal transmitted from the slave station whose transmission timing is shifted adversely affects the data burst signal transmitted from the other slave station. Transmission quality can be kept high. Further, even if the correction period of the bit shift becomes long, there is no fear that other slave stations will be disconnected during this period. Furthermore, by stopping the transmission of the data burst signal during the bit shift correction period, the control unit 40 does not need to perform control related to data transmission. Therefore, the control unit 40 performs only the bit shift correction control. This makes it possible to improve the efficiency of the bit shift correction control and shorten the time until the correction of the transmission timing is completed.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the transmission of the data burst signal is stopped by determining whether or not the bit shift exceeds the allowable amount in the bit shift correction process. The transmission of the data burst signal may be stopped by determining whether or not the value exceeds the value. With this configuration, the transmission of the data burst signal can be stopped from the phase shift correction period to the bit shift correction period, so that the period during which the transmission quality deteriorates can be further reduced. Further, in the above embodiment, it is determined whether or not the shift amount of the transmission timing in each slave station exceeds the allowable amount, but the shift amount of the transmission timing of each slave station in the master station exceeds the allowable amount. It is also possible to determine whether or not the master station does not transmit the data burst signal to the slave station if it exceeds the allowable amount. Others
The capture control procedure of the transmission timing, the content of the capture control, the configuration of the transmission stop control means, the control procedure, and the like can be variously modified and implemented without departing from the gist of the present invention.

[Effects of the Invention] As described in detail above, the present invention provides a slave station with transmission means for transmitting a timing capture signal to a master station within a control slot provided in its transmission frame, Detection notifying means for detecting a deviation amount of the reception timing for the timing acquisition from the regular reception timing and notifying a timing adjustment control signal corresponding to the detection result to the slave station which has transmitted the timing acquisition signal, and In the slave station, transmission timing acquisition control means for adjusting the transmission timing of its own station so as to make the deviation zero according to the timing adjustment control signal notified from the master station, It is determined whether the deviation amount of the reception timing notified from the station exceeds an allowable value, and when it is determined that the deviation exceeds the allowable value,
A burst signal stop control means for stopping transmission of a data burst signal to the master station at least until the shift amount of the reception timing in the master station is reduced to within a predetermined amount is newly provided.

According to another aspect of the present invention, the slave station is provided with sending means for sending a timing capture signal to a master station in a control slot provided in the transmission frame, and the master station has the timing capture signal. A deviation amount of the reception timing from the normal reception timing is detected, and a timing adjustment control signal corresponding to the detection result is notified to the slave station that transmitted the timing acquisition signal, and whether the deviation amount exceeds an allowable value. The slave station that has transmitted the timing stop signal together with the timing adjustment control signal together with the transmission stop instruction information for stopping the transmission of the data burst signal when the deviation amount exceeds the allowable value. And a detection notification means for notifying the slave station of the own station in accordance with the timing adjustment control signal notified from the master station so as to reduce the deviation amount to zero. Transmission timing capture control means for adjusting the timing and burst transmission stop control means for stopping transmission of a data burst signal to the master station when the above-mentioned transmission stop instruction information is received from the master station. Things. Therefore, according to the present invention, in any of the above configurations, it is possible to prevent the data burst signal from being transmitted from the slave station as much as possible in a state where the transmission timing deviation exceeds the allowable value. The present invention provides a transmission timing acquisition method that can reduce the adverse effect on the data transmission operation of another slave station and that can shift the transmission timing by a predetermined amount or more to concentrate on transmission timing acquisition control and improve its efficiency. be able to.

[Brief description of the drawings]

1 to 8 are diagrams for explaining a transmission timing acquisition method according to an embodiment of the present invention. FIG. 1 is a functional block diagram showing the configuration of a master station and a slave station to which the method is applied. 2 is a configuration diagram of a TDM signal transmitted from the master station to the slave station, FIG. 3 is a configuration diagram of a TDMA signal transmitted from the slave station to the master station, and FIGS. 4 to 8 are used for explaining the operation. FIGS. 9 to 12 are used for explaining the prior art, FIG. 9 is a schematic configuration diagram of a time division multiple access wireless communication system, FIG. 10 is a frame configuration diagram of a TDM signal, FIG. The figure is a timing chart showing the transmission form of each slave station, and FIG. 12 is a frame configuration diagram of a TDMA signal. AA: master station, BB: slave station, 10,30 ... wireless line termination device, 11,31 ... modulator / demodulator, 12,32 ... antenna, 13,33
…… Wireless transceiver, 14,34 …… Console, 15,35 ……
Multiplexing unit, 16, 36 ... separating unit, 16a ... shift detecting means, 1
7, 37 ... interface, 18, 38 ... line, 19, 39 ... terminal device, 20, 40 ... control unit, 20a ... phase shift information transmission control means, 20b ... bit shift information transmission control means, 20c ……
Timing holding control means, 40a phase shift adjustment control means, 40b bit shift adjustment control means, 40c burst transmission stop control means, 21, 41 nonvolatile memory, 42
Transmission timing variable section, 42a... Phase shift circuit, 42b... Bit delay circuit.

Claims (5)

(57) [Claims] 1. A time division multiple access wireless communication system for performing wireless communication by a burst signal between one master station and a plurality of slave stations, wherein the slave station is provided to the master station in a transmission frame thereof. The master station receives the timing acquisition signal from the slave station, and detects a deviation amount of the reception timing from a normal reception timing. A detection notification unit that notifies a timing adjustment control signal corresponding to the detection result to the slave station that has transmitted the timing acquisition signal, wherein the slave station includes the timing adjustment control signal notified from the master station. Transmission timing acquisition control means for adjusting the transmission timing of its own station so as to make the deviation amount zero according to the following; In the control process of the transmission timing by the transmission timing acquisition control means,
It is determined whether the shift amount of the reception timing notified by the master station exceeds the allowable amount, and when it is determined that the shift amount exceeds the allowable amount, at least the shift of the reception timing notified by the master station is determined. Until the amount decreases within the prescribed amount,
And a burst transmission stop control means for stopping transmission of a data burst signal to the master station. 2. A transmission timing control process by said transmission means, said detection notifying means, and said transmission timing acquisition control means, is repeated until the deviation of the reception timing notified from said master station decreases to within a predetermined amount. The transmission timing acquisition method according to claim 1, wherein the transmission timing acquisition method is executed. 3. The detection notifying means according to claim 1, wherein
Detecting a bit shift amount of a reception timing of the timing acquisition signal with respect to a normal reception timing, and notifying a slave station that has transmitted the timing acquisition signal of a timing adjustment control signal corresponding to the detection result. The transmission timing acquisition method according to claim 1. 4. The method according to claim 1, wherein the detecting and notifying means includes:
Detecting a phase shift amount of a reception timing of the timing acquisition signal with respect to a normal reception timing, and notifying a timing adjustment control signal corresponding to the detection result to a slave station that has transmitted the timing acquisition signal. The transmission timing acquisition method according to claim 1. 5. A time division multiple access wireless signal system for performing wireless communication by a burst signal between one master station and a plurality of slave stations, wherein said slave station is provided to said master station in a transmission frame thereof. The master station receives the timing acquisition signal from the slave station, and detects a deviation amount of the reception timing from a normal reception timing. The timing adjustment control signal corresponding to the detection result is notified to the slave station that has transmitted the timing acquisition signal, and it is determined whether or not the amount of deviation from the reception timing exceeds an allowable value. When the deviation amount exceeds an allowable value, transmission stop instruction information for stopping transmission of a data burst signal is referred to as the timing adjustment control signal. Further comprising detection notification means for notifying the slave station that has transmitted the timing capture signal, wherein the slave station transmits its own signal to reduce the deviation amount to zero according to the timing adjustment control signal notified from the master station. Transmission timing capture control means for adjusting timing, and when the transmission stop instruction information is received from the master station,
And a burst transmission stop control means for stopping transmission of a data burst signal to the master station.