JPH03128532A - Transmission timing adjusting system - Google Patents

Abstract

PURPOSE:To always stably and successively easily set the transmission timing of a slave station by sending out a signal for timing adjustment from the slave station to a host station in a slot for control provided in a transmission frame. CONSTITUTION:A phase stagger information transmission control means 20a outputs an instruction to a slave station BB so as to adjust the phase stagger of the transmission timing and notifies the phase stagger information of a burst signal for phase adjustment, which is sent from the slave station BB, to the slave station BB and the phase adjustment of the transmission timing is executed by the slave station BB. After the phase stagger is adjusted by the phase stagger information transmission control means 20a, a bit stagger information transmission control means 20b outputs an instruction to the slave station BB so as to adjust the bit stagger and afterwards notifies the bit stagger information of a burst signal for bit stagger adjustment sent from the slave station BB to the slave station BB and the adjustment of the transmission timing is executed by the slave station BB for the unit of a 1 /2 bit.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a time division multiple access wireless communication system that performs wireless communication between one master station and a plurality of slave stations using burst signals. The present invention relates to a transmission timing adjustment method for adjusting the transmission timing of a slave station so that its transmission signal does not overlap with the transmission signal from other slave stations in a master station.

(Prior Art) In recent years, with the development of communication technology and the diversification of communication needs, various communication systems have been developed, including time division multiple access (TDMA).
There is a wireless communication system that employs a multiple access (Multiple Access) method. FIG. 9 shows an example of the configuration, and this system is composed of one master station A and a plurality of slave stations B1 to Bn arbitrarily distributed.

Then, from the master station A to each slave station B1 to Bn, for example, the 10th
As shown in the figure, time division multiplexed signals (TDM signals) consisting of continuous waves are sent out, and from the slave stations B1 to Bn to the master station A, each of the slave stations B1 to Bn assigns signals to its own station in advance as shown in Figure 11. By sending data signals consisting of burst waves to the time slots TS1 to TSn, the master station A and each slave station B
Data is mutually communicated between 1 and 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 from one slave station to another, a difference occurs in the propagation time of the radio signal. For this reason, each slave station B1 to B
In order to prevent the transmission signals from overlapping each other at the master station A, it is necessary to adjust the signal transmission timings when installing the slave stations and set them to optimal timings.

Therefore, in the past, for example, maintenance personnel were assigned to the master station A and the slave station Bi whose transmission timing was to be adjusted, and in this state, the time slots TSi for data transmission actually allocated by the slave station Bi were used. A burst signal for adjustment is sent out, and the maintenance person at the master station A observes the deviation from the regular reception timing of this burst signal, and reports this amount of deviation to the maintenance person at the slave station Bi by telephone, etc. Child station Bi
Then, maintenance personnel operate switches such as volume controls to adjust the transmission timing so that the amount of deviation becomes zero. However, in this method, the burst signal for adjustment is sent to slave station B.
Time slot TSi for data transmission assigned to i
Since the system is actually used for transmission, system operation must be temporarily stopped each time the transmission timing is adjusted, resulting in a decrease in system availability (1018 points). Furthermore, since maintenance personnel must be dispatched to each of the master station A and the slave station Bi, there is a problem in that adjustments cannot be easily made at any time.

On the other hand, there is the following as another timing adjustment method that has been considered in the past. That is, for example, as shown in FIG. 12, the TD transmitted from each slave station B1 to Bn to the master station A
A control slot is provided in the MA signal, and when adjusting the transmission timing of the slave station Bi, this control slot is used to send out a burst signal for adjustment from the slave station Bi to the master station A. Then, the master station A detects the amount of deviation from the regular reception timing of this adjustment burst signal, and transmits the detection result of this deviation amount from the master station A using the control slot of the TDM signal (Figure m10). Notify the slave station Bi and display it on a display, etc. Then, the maintenance personnel of the slave station Bi manually operate switches according to the amount of deviation displayed on the display, etc., thereby setting the transmission timing of the slave station Bi.

In this type of system, the burst signal for adjustment is
Because it is transmitted using the MA signal control slot,
There is no effect on the data transmission time slots of other slave stations that are already in operation, and therefore the transmission timing of any slave station Bi can be set without stopping the system.

However, in this conventional method, maintenance personnel still manually adjust the transmission timing at the slave station Bi, resulting in incorrect settings and variations in setting accuracy depending on the maintenance personnel. It was difficult to set stable timing. If the transmission timing is not set accurately, transmission signals in adjacent time slots may be adversely affected, resulting in increased transmission errors or, in the worst case, transmission failure. Guard bits are generally provided between time slots in order to absorb minute timing deviations, but in order to prevent interference between time slots due to the above-mentioned incorrect settings, etc., the width of the guard pit must be adjusted. must be expanded. However, if the guard pit width is expanded in this way, TDMA
There is a problem in that the number of time slots for data transmission that can be accommodated in a frame decreases, leading to a decrease in transmission efficiency. Furthermore, in the conventional system described above, a maintenance person must be dispatched to the corresponding slave station Bi each time the transmission timing is adjusted, so there is a problem that the adjustment work is troublesome and cannot be easily performed.

(Problems to be Solved by the Invention) As described above, in the conventional transmission timing adjustment method, maintenance personnel manually set the transmission timing at the slave station, which tends to cause incorrect settings. ! The problem is that stable settings cannot be made because of variations in accuracy, and furthermore, the setting work is troublesome and cannot be easily performed at any time.

Therefore, the present invention focuses on this point, and makes it possible to eliminate the need for maintenance personnel at the slave station, and to easily set the transmission timing of the slave station always stably and at any time.
It is an object of the present invention to provide a transmission timing adjustment method that can reduce the bit shift amount of transmission timing during Jfl and reduce the influence on data transmission.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a time division multiple access wireless communication system that performs wireless communication using burst signals between one master station and a plurality of slave stations. A timing adjustment signal is sent from the master station to the master station within the control slot provided in the transmission frame, and the master station calculates the amount of phase shift of the reception phase of this timing adjustment signal with respect to the normal reception phase of 0 degrees and i80 degrees. is detected, the smaller of them is set as the detected phase shift amount, and information representing this detected phase shift amount is notified to the slave station that sent the timing adjustment signal, and this slave station receives the notification from the master station. The transmission phase of the local station is adjusted in accordance with the information representing the detected amount of phase shift to make the phase shift amount zero, and then a timing adjustment signal is sent from the slave station to the master station at the transmission timing after the phase shift adjustment. The master station detects the amount of bit deviation between the reception timing of this timing adjustment signal and the normal reception timing in 1/2 bit units, and uses the information representing the detected amount of bit deviation from the timing adjustment signal. This notification is sent to the transmitting slave station, and the slave station adjusts the transmission timing of its own station in accordance with the information representing the bit displacement amount to make the bit displacement amount zero.

Further, the present invention provides a series of phase adjustment procedures from sending out a timing adjustment signal to adjusting the phase of the transmission timing, and a series of bit adjustment steps from sending out the timing adjustment signal to bit adjustment of the transmission timing, respectively. Repeating until the deviation and bit deviation are below a predetermined amount, and using a signal with a fixed repeating pattern as a timing adjustment signal to detect the phase deviation, and Another feature is that a specific pattern different from the noise pattern generated on the transmission path is used as the timing adjustment signal.

(Operation) As a result, according to the present invention, it is possible to automatically set the transmission timing of a slave station without requiring maintenance personnel. Therefore, it is possible to always perform stable timing settings by eliminating the occurrence of erroneous settings and variations in setting accuracy, and it is also possible to easily perform timing settings at any time without the need for troublesome work. In addition, the transmission timing of the slave station is adjusted by first detecting the phase shift and setting it to zero or 180 m' off, and then detecting the bit shift and setting it to zero. The master station can always accurately detect the deviation from the normal reception timing of the bit:A required signal sent from the base station.

Furthermore, when detecting a phase shift, the smaller of the phase shift amounts relative to the reference phase of 0 degrees and 180 degrees is selected, and adjustments are made to make this phase shift amount zero, and in the subsequent bit shift adjustment. Since the adjustment is made in units of 172 bits, the increase in bit deviation in transmission timing due to phase adjustment can be suppressed to 1/2 bit, which is compared to the conventional method where the increase in bit deviation due to phase adjustment was 1 bit. The amount of bit shift in the data transmission timing during transmission timing adjustment is reduced by 172% compared to the conventional method.
bits, thereby reducing the impact on other adjacent time slots.

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

First, the master station AA includes a wireless line termination device 10, a modem device 11 that modulates and demodulates transmitted/received signals, a wireless transmitting/receiving device 13 having an antenna 12, a human operation section such as a key switch, and an output display section such as a display. Console 14
It is equipped with

Of these, the wireless line terminal device 10 includes a multiplexer 15 and a demultiplexer 16 that multiplex transmit signals and demultiplex receive TDMA signals;
6 via signal buses, and these interfaces 17 have four wires 1
Terminal devices 19 are respectively connected via 8. Furthermore, the wireless line terminal device 10 has a control unit 20 and, for example, an E2
A nonvolatile memory 21 consisting of FROM is provided. The control unit 20 has, for example, a microcomputer as a main control unit, and in addition to control means related to normal data transmission operations, it also includes a phase shift information transmission control means 20a used when capturing the transmission timing of the slave station BB. and a bit deviation information transmission control means 20b.

The phase shift information transmission control means 20a instructs the slave station BH to adjust the phase shift of the transmission timing when adjusting the transmission timing due to new installation of the slave station BB or periodic inspection after installation. Then, the phase shift information of the phase adjustment burst number i sent from the slave station BB is notified to the slave station BB, and the slave station BB is made to adjust the phase of the transmission timing. The detection of the phase shift is performed by a shift detection means 16a provided in the separating section 16. As a detection method, a method is used in which the received phase is compared with the reference phase of 0 degrees and 180 degrees, and the smaller of the detected phase shift amounts is selected.

After the phase shift information transmission control means 20a has finished adjusting the phase shift, the bit shift information transmission control means 20b issues an instruction to the slave station BB to adjust the bit shift, and then transmits the bit shift from the slave station BB. The bit shift information of the bit shift adjustment burst signal thus obtained is notified to the slave station BB, and the slave station BB is made to adjust the transmission timing in 1/2 bit units. In addition, the detection of the bit shift mentioned above is also
This is performed by a shift detection means 16a provided in the separating section 16.

Figure 2 shows the TDM sent from the master station AA to the slave station BB.
This shows the frame structure of the signal. As shown in Figure (a), this TDM signal has a control slot arranged between the synchronization bit F and a plurality of data transmission time slots TSI to TSn. A timing adjustment control signal is sent using a portion of the control slot. This timing adjustment control signal, as shown in FIG. 3(b), is composed of bits that respectively input the identification number ID of the slave station, instruction information C0NT to the slave station, phase shift information, bit shift information, and preliminary information. Note that (C) in the same figure shows the configuration of the data transmission time slots TSI to TSn, where F is the synchronization bit, ID is the identification number of the slave station, Sv is the maintenance bit, and H
indicates data, and P indicates a parity bit.

On the other hand, the slave station BB also includes a radio line termination device 30, a modem device 31, a radio transmitter/receiver device 33 having an antenna 32, and a console 34, like the parent device AA. Of these, the radio line termination device 30 includes a multiplexing section 35 that multiplexes transmission data and control signals, a demultiplexing section 36 that separates a signal addressed to the local station from the TDM signal sent from the master station AA, and a demultiplexing section 36 that multiplexes transmission data and control signals. A plurality of interfaces 37 are connected to the section 35 and the separation section 36 via signal buses.
Terminal devices 39 are connected to these interfaces 37 via lines 38, respectively.

Further, the wireless line terminal device 30 has a control unit 40 and, for example, an E
2. They each have a nonvolatile memory 41 consisting of a PROM, and a transmission timing variable section 42. First of all, the transmission timing variable section 42 includes a phase shift circuit 42a that varies the transmission phase of the transmission signal, and a bit delay circuit 42b that varies the transmission timing of the transmission signal in units of 1/2 bit.

The control unit 40 has, for example, a microcomputer as a main control unit, and in addition to control means related to normal transmission and reception operations, it also controls phase shift 2 related to capture of transmission timing.
1 set riiQ 8 means 40a and bit deviation 5! The control means 40b is also provided. Phase shift adjustment control means 40
a 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. When phase shift information is sent, the amount of phase shift of the phase shift circuit 42a is variably controlled in accordance with this information. Bit deviation: A adjustment sub-control means 40b, master station AA
It operates when a bit misalignment adjustment instruction is sent from
A bit adjustment burst signal is sent to the master station AA using the control slot of the TDMA frame, and when bit shift information is sent from the master station AA, the bit delay circuit responds to this information. This is to variably control the delay amount of 42b.

FIG. 3 shows the frame structure of the TDMA signal transmitted from each slave station configured as above to the master station AA.
This signal is transmitted to the control slot AQ as shown in FIG.
is placed at the beginning, followed by time slots TS1 to TSn for data transmission. Then, a part of the control slot AQ is used to selectively send out a phase adjustment burst signal and a bit adjustment burst signal. The burst signal for phase adjustment is shown in the same figure (b).
As shown in the figure, it consists of a repeating signal of "10" (38 bits). Further, the bit adjustment burst signal is composed of a predetermined synchronization pattern (SYNC pattern) and the identification number ID of the slave station, as shown in FIG. Note that (d) in the same figure shows the configuration of the data transmission time slots TS1 to TSn, where G is the guard bit, ID is the identification number of the slave station,
Sv represents a maintenance bit, H represents data, and P represents a parity bit.

Next, the transmission timing adjustment method of this embodiment will be explained based on the above configuration. Note that an explanation will be given here taking as an example a case where the transmission timing is adjusted periodically during operation.

If it is now time to adjust the transmission timing of the slave station BB, the control unit 20 of the master station AA first creates a timing adjustment control signal for phase shift adjustment. Figure 4 shows its configuration, in which the ID number of the slave station BB is inserted into the ID number bit, and the first bit of the instruction information consisting of 4 bits, that is, the adjustment type bit, corresponds to the phase adjustment instruction. “
At the same time, the final bit of the instruction information, that is, the adjustment start and end bit, is set to “0” corresponding to the adjustment start instruction.
Set to °. Then, this control signal is sent to the multiplexer 15.
The signal is inserted into the TDM signal control slot and sent to the slave station BB. At this time, other areas of the TDM signal control slot and each time slot T for data transmission
SI to T S n (: indicates that the IIJ I signal and data addressed to each slave station are multiplexed and sent out.

On the other hand, when the control unit 40 of the slave station BB detects that a timing:A adjustment control signal addressed to the own station is inserted into the control slot of the TDM signal sent from the master station AA, the control unit 40 of the slave station BB instructs First, the content of instructions from the master station AA is recognized from the information. Since the phase adjustment instruction bit is now "0", it is recognized that the instruction is for phase adjustment, and thereafter control for phase shift adjustment is started. In other words, if we assume that the phase can be adjusted in units of 1720 bits,
At the current transmission timing, the phase adjustment burst signal shown in FIG. 3(b) 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 detects the phase adjustment burst signal from the control slot of the TDMA signal arriving from the slave station BB, and detects the phase adjustment burst signal using the shift detection means 16a. The reception phase is compared with the normal reception phase of 0 degrees and (80 degrees), and the respective phase deviation amounts are detected.Then, the control unit 20 selects the smaller of these phase deviation amounts, and this selection is performed. A phase correction value is obtained from the detected phase deviation value, and this phase correction value is inserted into the phase deviation information bit of the timing adjustment control signal shown in FIG. 2(b), and is sent to the slave station BB. For example, as shown in FIG. 5, the reception phase of the phase adjustment burst signal (a) is different from the normal reception phase (
Assume that it is delayed by 8/20 bits compared to 0 degrees in b) and is ahead by 2/20 bits compared to 180 degrees in the normal reception phase (b).

Then, the control section 20 selects the smaller of these phase shift amounts, that is, 2720 bits.

It then determines that it is necessary to delay the transmission phase of slave station BB by 2/20 bits, and sends a phase correction value of "r+2/20 bits" to slave station BB. Note that the phase shift information is represented by 8 bits, for example, as shown in FIG. 2(b), with the first 1 bit representing 10 and the remaining 7 bits representing m/20. Therefore, in this case, the phase correction value rooooooloJ is sent to the slave station BB.

On the other hand, when the slave station BB receives the phase correction value addressed to it from the master station AA, the control unit 40 adds the h0 positive value + 2/20 bits to the current value of the phase shift amount, and The phase shift amount of the circuit 42a is corrected to the above addition result. Thus, the transmission phase of the slave station BB is adjusted so that the phase difference is zero or deviated by 180 degrees from the reference phase at the master station AA.

Note that after this phase correction, slave station BB sends the phase adjustment burst signal again to master station AA with the phase after the above correction. In contrast, when the phase correction value is sent again from the master station AA, the phase shift amount of the phase shift circuit 42a is readjusted according to this phase correction value, and thereafter the phase difference of the master station AA is zero or 1.
Repeat the above operation until the position is shifted by 80 degrees.

Now, when the phase difference becomes zero or deviates by 180 degrees due to the above phase adjustment, the master station AA stores the final phase shift amount set in the slave station BB in the nonvolatile memory 21, and then
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 sent to the slave station BB. When the control signal instructing the bit adjustment arrives from the master station AA, the station BB determines that the phase adjustment has been completed and first stores the final phase shift amount in the non-intrusive memory 41 in the same manner as the master unit AA. After that, control for bit adjustment is started.That is, first, the control unit 40 inputs a predetermined synchronization pattern and the own station's I as shown in FIG.
generates a bit adjustment burst signal consisting of a D number,
This signal is inserted into the control slot AQ of the TDMA frame by the multiplexer 35 and sent to the master station AA.

Then, when the bit adjustment burst signal arrives from the slave station BB, the master station AA uses the deviation detection means 16a of the separation unit 16 to detect the amount of bit deviation from the synchronization pattern reception timing to the regular reception timing in units of 172 bits. . Then, the control unit 20 calculates a bit deviation correction value to make this bit deviation amount zero, and inserts this correction value into the bit deviation information bit of the timing A adjustment control signal shown in FIG. 2(b). , is sent to slave station BB. For example, if the reception timing (a) of the bit adjustment burst signal is 0.5 bit earlier than the regular reception timing (b) as shown in FIG. 7, the transmission timing of slave station BB is 0.5 bit earlier. Therefore, the control unit 20 sends a bit correction value of 0.5 bits to the slave station BB. Note that the bit shift information is also expressed in 8 bits like the phase shift information, and the first bit represents - or 10, the next bit represents the presence or absence of a 0.5 bit shift, and the remaining bits represent the presence or absence of a 0.5 bit shift. The 7 bits represent the amount of bit shift. Therefore, in this case, the message to slave station BB is roloooooo.
A bit correction value oJ is sent.

On the other hand, when the slave station BB receives the bit correction value (+0.5 bit) addressed to it from the master station AA, it changes the delay amount of the bit delay circuit 42b by 0.5 from the currently set value.
Delay by bits. Thus, the transmission timing of the slave station BB is adjusted so that the bit deviation with respect to the reference timing at the master station AA becomes zero. And the slave station BB is
At the transmission timing after this bit shift correction, the bit adjustment bar and strike signals are sent again to the master station AA. On the other hand, when the master station AA confirms that there is no bit deviation from the reception timing of the bit adjustment burst signal retransmitted from the slave station BB, the master station AA sets the final bit delay amount set for the slave station BB to a non-volatile state. At the same time, as shown in FIG. 8, the :A adjustment start/end bit of the instruction information of the timing adjustment control signal is set to "1" corresponding to the adjustment end instruction and sent to the slave station BB. . Then, the slave station BB recognizes that the transmission timing adjustment is completed from the adjustment start/end bit being "1", and stores the final delay amount set in the bit delay circuit 42b in the nonvolatile memory 41. Thereafter, data is transmitted according to this transmission timing until the next periodic adjustment.

As described above, this embodiment provides the following effects.

■ Since the control unit 40 of the slave station BB adjusts the transmission timing of the transmission timing variable unit 42 according to the correction value notified from the master station AA, the transmission timing of the slave station BB can be adjusted manually by maintenance personnel. It becomes possible to set the transmission timing automatically without relying on it, and as a result, the transmission timing can always be set stably without causing erroneous settings or variations in set values. Furthermore, since there is no need to dispatch maintenance personnel to the slave station BH, the transmission timing can be quickly and easily set at any time.

■ The procedure for adjusting and setting the transmission timing is divided into a phase shift adjustment procedure and a bit shift adjustment procedure. First, in the phase shift adjustment, the reception phase of the burst signal for phase adjustment from the slave station BB is determined by the master station AA. is compared with the reference phase of 0 degrees and 180 degrees to detect each phase shift,
The smaller of these phase shift amounts is selected and the slave station BB
Then, in the bit shift adjustment, the amount of bit shift with respect to the reference timing of the reception timing of the bit adjustment burst signal sent from slave station BB is detected in units of 172 bits, and this bit shift is Since the bit shift is adjusted by notifying the slave station BH of the amount, the amount of change in the bit shift in the transmission timing that occurs during phase shift adjustment can be suppressed to 0.5 bits. The amount of bits in which data transmitted from slave station BB intrudes into other adjacent time slots can be reduced, thereby minimizing deterioration in transmission quality. By the way, in the conventional method in which phase adjustment was performed by comparing the received phase of the phase adjustment burst signal only with the reference phase of 0 degrees, the detected amount of phase shift was 8/20 bits in the case shown in Figure 5. As a result, the transmission phase (b) of slave station BH is shifted by one bit from the reference phase (a).

■ In the phase shift adjustment procedure and the bit shift adjustment procedure, each adjustment procedure is repeated until the master station AA detects that the phase shift and bit shift have become zero, so each adjustment procedure can be executed once. The settings can be made with higher precision than when the adjustment is finished just by doing the following.

■ As the timing adjustment signal, a repeating pattern of "10" is used that makes it easy to accurately detect rising or falling edges during phase adjustment, and it can be detected clearly distinguishable from the noise pattern generated in the transmission path during bit adjustment. Since the specific pattern is used, the amount of phase shift and the amount of bit shift can be detected with high precision at the master station.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, correction values for the phase shift and bit shift are obtained at the master station AA, and these correction values are transmitted to the slave station BB.
However, the detected values of phase shift and bit shift are directly notified from the master station to the slave station, and the slave station calculates the correction value to reduce these detected values to zero. The transmission timing may be adjusted accordingly. In addition, various modifications may be made to the transmission timing adjustment control procedure in the master station and slave stations, the configurations of the timing adjustment control signal, phase adjustment burst signal, bit adjustment burst signal, etc. without departing from the gist of the present invention. can.

[Effects of the Invention] As detailed above, the present invention transmits a timing adjustment signal from the slave station to the master station within the control slot provided in the transmission frame, and the master station transmits the timing adjustment signal. The amount of phase shift of the reception phase of the normal reception phase of 0 degrees and 180 degrees is detected respectively, the smaller of the two is set as the detected phase shift amount, and the information representing this detected phase shift amount is sent out as the timing adjustment signal. This slave station adjusts its own transmission phase to make the amount of phase shift zero according to the information indicating the detected amount of phase shift notified from the master station, and then A timing adjustment signal is sent from the station to the master station at the transmission timing after the above phase shift adjustment, and the master station detects the amount of bit deviation of the reception timing of this timing adjustment signal with respect to the normal reception timing in 1/2 bit units. Then, the information representing the detected amount of bit deviation is notified to the slave station that sent the timing adjustment signal, and the slave station automatically adjusts the amount of bit deviation to zero according to the information representing the amount of bit deviation. It is designed to adjust the transmission timing of the station.

Therefore, according to the present invention, it is possible to eliminate the need for maintenance personnel at the slave station, to always stably and easily set the transmission timing of the slave station at any time, and to reduce the amount of bit deviation in the transmission timing during transmission timing adjustment. It is possible to provide a transmission timing: A-aligned method that can reduce the influence on data transmission.

[Brief explanation of the drawing]

1 to 8 are for explaining the transmission timing g adjustment method in one embodiment of the present invention, and FIG. 1 is a functional block diagram showing the configuration of a master station and a slave station to which the method is applied; Figure 2 is a configuration diagram of the TDM signal sent from the master station to the slave station, Figure 3 is a configuration diagram of the TDMA signal transmitted from the slave station to the master station, and Figures 4 to 8 are used to explain the operation. The signal configuration diagrams m9 to 12 are used to explain the conventional technology, and FIG. 9 is a schematic configuration diagram of a time division multiple access wireless communication system, and FIG. m10 is a frame configuration diagram of a TDM signal. is a timing diagram showing the transmission form of each slave station, m12
The figure is a frame configuration diagram of a TDMA signal. AA...Master station, BB...Slave station, 10.30...Radio line termination device, 11.31...Modulation/demodulation device, 12.32...Antenna, 13.33...Radio transmission/reception Apparatus, 14.34... Console, 15.35... Multiplexing section, 16.36... Minute M section, 16g... Displacement detection means, 17.37... Interface, 18.38.・
・Line, 19.39...Terminal device, 20.40...
Control unit, 20a... Phase shift information transmission control means, 20
b... Bit deviation information sending control means, 20c... Timing holding control means, 40a... Phase deviation adjustment control means, 40b... Bit deviation adjustment control means, 21.41...
- Non-volatile memory, 42... Transmission timing variable section, 42a... Phase shift circuit, 42b... Bit delay circuit.

Claims (3)

[Claims] (1) In a time division multiple access wireless communication system that performs wireless communication using burst signals between one master station and multiple slave stations, a control slot provided in a transmission frame from the slave station to the master station. The master station sends out a timing adjustment signal, and the master station detects the amount of phase shift of the reception phase of this timing adjustment signal with respect to the normal reception phase of 0 degrees and 180 degrees, and the smaller of the two is determined as the detected phase shift amount. , the information representing the detected amount of phase shift is notified to the slave station that sent the timing adjustment signal, and the slave station adjusts the amount of phase shift according to the information representing the detected amount of phase shift notified from the master station. Adjust the transmission phase of your own station to make it zero,
Next, a timing adjustment signal is sent from the slave station to the master station at the transmission timing after the phase shift adjustment, and the master station calculates the amount of bit deviation of the timing adjustment signal reception timing by 1/2 bit from the normal reception timing. unit, the information representing the detected amount of bit deviation is notified to the slave station that sent the timing adjustment signal, and the slave station sets the amount of bit deviation to zero according to the information representing the amount of bit deviation. A transmission timing adjustment method characterized in that the transmission timing of its own station is adjusted as much as possible. (2) A series of phase adjustment procedures from sending out a timing adjustment signal to adjusting the phase of the transmission timing, and a series of bit adjustment procedures from sending out a timing adjustment signal to bit adjustment of the transmission timing, respectively. 2. The transmission timing adjustment method according to claim 1, wherein the transmission timing adjustment method is repeated until the bit shift becomes equal to or less than a predetermined amount. (3) A repeating pattern signal with a fixed pattern is used as a timing adjustment signal for detecting a phase shift, and noise generated on the transmission path is used as a timing adjustment signal for detecting a bit shift. A claim characterized in that a specific pattern different from the pattern is used (
1) Transmission timing adjustment method described.