JPH02276321A - Automatic inter-station phase compensating system - Google Patents

Abstract

PURPOSE:To easily perform phase compensation even when a large number of stations exist as peripheral radio base stations by connecting a first station to an end station via one or more intermediate stations connected in series with an outgoing line and an incoming line on the same route. CONSTITUTION:The title system is equipped with a central radio base station 10, the peripheral radio base station 20A connected to the central radio base station 10 via the outgoing line 31A and the incoming 31B, the peripheral radio base station 20B connected to the peripheral radio base station 20A via the outgoing line 32A and the incoming line 32B, the peripheral radio base station 20C connected to the peripheral radio base station 20B via the outgoing line 33A and the incoming line 33B, and the peripheral radio base station 20d connected to the peripheral radio base station 20C via the outgoing line 34A and the incoming line 34B. Data from the central radio base station 10 circulates through all the peripheral radio base stations, and is folded at the end peripheral radio base station 20D. Folded data arrives at the central radio base station 10 via the incoming line passing the same route as that of the outgoing line.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inter-station automatic phase system that corrects the phase of data wirelessly transmitted from peripheral wireless base stations to the phase of data wirelessly transmitted from a central wireless base station. Compensation Method [Prior Art] Conventionally, there is an inter-office automatic phase compensation method that performs phase compensation between a central radio base station and peripheral radio base stations using a control signal. An example of this inter-station automatic phase compensation method is shown in the fifth section.
As shown in the figure.

In FIG. 5, 50 is a central radio base station, and 70 is a peripheral radio base station. The central radio base station 50 includes a paging signal encoding device 51, a phase monitoring control device 52, and a delay circuit 5.
3, a transmitter 54, and a transmitting antenna 54A, and a calling signal is applied to an input terminal 55.

Further, the peripheral radio base station 70 basically includes a modulation/demodulation circuit 73, a phase comparison circuit 72, a receiver 71, a reception antenna 71A, a delay circuit 74, a transmitter lff 175, and a transmitter antenna 75A.

Each of the central radio base station 50 and the peripheral radio base stations 70 has two communication lines, a downlink 61 and an uplink 62.
connected by one line. Both lines are set between the phase monitoring control device 52 and the modulation/demodulation circuit 73.

Such an inter-office automatic phase compensation method is used in a wide area wireless paging system. Wide area radio calling system
A large number of radio paging stations, each consisting of a central radio base station and a plurality of peripheral radio base stations, simultaneously transmit the same paging signal by radio. An example of this wide area radio paging system is shown in FIG.

The wide area wireless paging system shown in FIG. 6 includes a communication line 80 between a central wireless base station 50 and a plurality of peripheral wireless base stations
The central wireless base station 50 transmits the calling signal to each peripheral wireless base station 70 via the communication line 80, and the central wireless base station 50 transmits the calling signal from the transmitting antenna 54A, and each peripheral wireless base station 70 transmits the calling signal from the transmitting antenna 75A. , respectively send the same call signal to their own service areas 500 and 600.
It is designed to simultaneously transmit wirelessly to

By the way, the communication line 80 includes not only a wired circuit but also a wireless line, and its route is not uniquely determined but changes. That is, the propagation time difference in the communication line 80 is not the same in each peripheral radio base station, and a phase difference occurs in the radio transmission timing of the paging signal. The overlapping part 700 of the boundaries of each service area 500° 600 is a radio wave interference area where the electric field strengths are close to each other, but if there is a phase difference, the receiver of the receiver located within the radio wave interference area 700 will see two areas with a phase difference. As a result of receiving waves, it cannot be demodulated correctly.
In other words, the call rate will decrease.

Therefore, the fifth method is to automatically compensate for such phase differences between stations to prevent a drop in the paging rate, and to control the paging signal transmission timing between each radio paging station to be in phase in a wide area radio paging system. This is the inter-station automatic phase compensation system shown in the figure.

Next, this conventional inter-office automatic phase compensation operation will be explained. When a calling signal applied to an input terminal 55 is input via the calling signal encoding device 51, the phase monitoring control device 52 in FIG. At the same time as the information is transmitted wirelessly toward the service area of the station, it is transmitted to each peripheral wireless base station 70 via the downlink 61, and wirelessly transmitted from the transmitting antenna 75A toward the respective service area. The above is the original operation of the inter-office automatic phase compensation system. In parallel with transmitting the paging signal, the phase monitoring control device 52 sends a control signal to the downlink 61,
The control signal is sent back from the uplink 62. Then, in the phase monitoring control device 52, the downlink 6
The phase difference between the control signal sent to 1 and the control signal sent back via the uplink 62 is constantly monitored, and when the phase difference exceeds a specified value, the following phase compensation operation is performed.

The phase monitoring control device 52 sends a command to the downlink 61 to set the transmitter 75 of the peripheral wireless base station 7o to a stopped state, and at the same time outputs a start command to the transmitter 54 of its own station.

Next, the phase monitoring control device 52 wirelessly transmits a phase correction signal from the transmission antenna 54A of its own station, and at the same time,
The same phase correction signal is sent to each peripheral wireless base station 70 via the downlink vA61.

Then, in each peripheral wireless base station 70, the wirelessly transmitted phase correction signal is received by the receiver 71 via the receiving antenna 71A and input to the phase comparison circuit 72.

On the other hand, the phase correction signal sent to the downlink 61 is demodulated by the modulation/demodulation circuit 73 and input to the phase comparison circuit 72 . Therefore, the phase comparator circuit 72 detects the re-input phase difference based on the phase of the wirelessly received phase correction signal, and sets the delay amount in the delay circuit 74 according to the detected phase difference.

The above is the inter-station phase compensation operation, and after an appropriate time, the phase monitoring control device 52 sends a command to the downlink 61 to activate the transmitter 75 of each peripheral wireless base station 70, and at the same time sends a subsequent paging signal. A calling signal is also sent to the transmitter 54 of the local station. As a result, each radio base station 70 can wirelessly transmit paging signals at the same phase timing, and a drop in paging rate is prevented. In addition, the central radio base station 50
The delay amount of the delay circuit 53 is artificially set to the optimum value for the system. The conventional inter-office automatic phase compensation system explained above is described in "Facility" Vol. 29, 9, published by the Telecommunications Association.
It is described on pages 79 to 89 of the issue.

[Problem that the invention aims to solve]

In the conventional inter-station phase compensation method described above, the central wireless base station monitors the phase difference between the phase of data sent to each peripheral wireless base station and the phase of data sent back from each peripheral wireless base station. ing.

Therefore, the phases of all peripheral wireless base stations must be monitored by the central wireless base station.

Furthermore, two trees for uplink and downlink are required for each peripheral wireless base station. In other words, when constructing a wide-area radio paging system with a large number of peripheral radio base stations, there are disadvantages in that the economic burden due to the use of lines increases and the equipment at the central radio base station also becomes large-scale for phase monitoring.

In addition, in the conventional inter-station phase compensation method using radio, 1
Since the radio wave range of a single wireless base station is limited, in order to perform phase correction in a wide area wireless paging system, the phase compensation operation must be repeated several times.

In phase compensation operation using radio, surrounding wireless base stations that try to receive radio waves from other wireless stations for phase correction,
Transmitter operation on that frequency must be stopped. Therefore, each surrounding wireless base station is required to activate the transmitter,
The drawback is that a control circuit for stopping is required.

An object of the present invention is to eliminate such drawbacks, eliminate the need for wireless reception of phase correction signals, eliminate the need for phase correction operations that are performed by stopping transmission, and allow many stations to operate as peripheral wireless base stations. It is an object of the present invention to provide an inter-office automatic phase compensation system that can easily perform phase correction even when there is an inter-station automatic phase compensation system that can reduce the number of required lines.

[Means to solve the problem]

The present invention is an inter-office automatic phase compensation system that compensates for the phase of data to be transmitted wirelessly, and when data from the downlink is input, this data is looped back to the uplink and the input data is wirelessly transmitted. When data is input from the last station and the downlink, this data is output to the next downlink, and when data is input from the uplink, this data is output to the next uplink, and the final station outputs the data to the next uplink. Set a delay time so that the phase is the same as the phase of the data to be transmitted wirelessly, and after this delay time, the data input from the downlink is transmitted wirelessly with one or more intermediate stations and delayed by a preset time. data is wirelessly transmitted in the same phase as the final station, and the data transmission time from the time until the data output to the downlink is looped back by the final station and input from the uplink to the data transmission time to the final station. is determined, a delay time is set based on this transmission time and a preset time, and the first station delays the data by this delay time and outputs it to this downlink. The first station is connected to the final station via the one or more intermediate stations connected in series by an uplink.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention. This inter-office phase compensation method uses a central radio base station 1°, a peripheral radio base station 2OA connected to the central radio base station 10 via a downlink 31A and an uplink 31B, and a downlink 32
A, peripheral wireless base station 20B connected to peripheral wireless base station 2OA via uplink 32B, and downlink 33A
, a peripheral radio base station 20C connected to the peripheral radio base station 20B via an uplink 33B, a downlink 34A,
It includes a peripheral radio base station 2QD connected to a peripheral radio base station 20C via an uplink 34B.

Further, the central radio base station 10 includes a delay circuit 11.15, a modulation circuit 12, a demodulation circuit 13, a phase comparison circuit 14, and a transmitter 16, as shown in FIG.

As shown in FIG. 3, the peripheral radio base stations 20A to 20D include a demodulation circuit 21.23, a modulation circuit 22.24,
It includes a phase comparison circuit 25, a delay circuit 26, and a transmitter 27.

In such an inter-office automatic phase compensation system, the delay circuit 11 of the central radio base station 10 delays the data of the paging signal from the input terminal 17 based on the setting signal S. Then, the delayed data a is transferred to the modulation circuit 12 and the phase comparator circuit 1.
Output to 4.

The modulation circuit 12 modulates the data a and transmits it to the downlink 31A.
Send to.

The demodulation circuit 13 demodulates data from the uplink 31B. Then, the demodulated data C is output to the phase comparator circuit 14.

The phase comparison circuit 14 compares the phase of the data a sent to the downlink 31A with the phase of the return data C from the uplink 31B, and estimates the delay time due to the line up to the final peripheral wireless base station 20D. Then, a setting signal is generated for setting a delay in the delay circuit 11 corresponding to the delay time that is insufficient for the set delay time of the delay circuit 15 in the central radio base station 10. Then, the setting signal S is output to the delay circuit 11.

The delay circuit 15 delays the data of the call signal from the input terminal 17 by a set time. The delay amount of the delay circuit 15 is artificially set so that the delay amount due to the line from the central radio base station 10 to the final peripheral radio base station 20D can never exceed the delay amount of the delay circuit 15.

The transmitter 16 wirelessly transmits the data from the delay circuit 15 via the transmitting antenna 16A.

The demodulation circuit 21 of each peripheral radio base station demodulates data input from the downlink. Then, the demodulated data d is output to the modulation circuit 22, the phase comparison circuit 25, and the delay circuit 26.

The modulation circuit 22 modulates the data d and transmits it to the next downlink.

The demodulation circuit 23 demodulates data input from the uplink. Then, the demodulated data e is output to the modulation circuit 24 and the phase comparison circuit 25.

The modulation circuit 24 modulates the data e and transmits it to the next uplink.

The phase comparison circuit 25 detects a phase difference between data d and data e. Then, a setting signal f is used to estimate the phase of the data sent by the peripheral wireless base station 20D that loops back the data, and to set the delay time necessary to have the same phase as the data of the final peripheral wireless base station 20D. generate.

The generated setting signal f is output to the delay circuit 26.

The delay circuit 26 gives the data d a delay time that is half the phase difference between uplink and downlink according to the setting signal f, and makes the data d have the same phase as the data that the lowest peripheral wireless base station 20D receives from the downlink. Then, the delayed data g is output to the transmitter 27.

Transmitter 27 wirelessly transmits data g via transmission antenna 27A.

The uplink passes through the same route as the downlink, which sequentially connects a plurality of peripheral radio base stations, and arrives at the central radio base station 10 in the reverse order of the downlink.

Next, the operation of this embodiment will be explained.

Data of a paging signal is input to the central radio base station 10. The data of this call signal is input to the delay circuit IL 15 via the input terminal 17 shown in FIG.

A delay amount is set in the delay circuit 11 by a setting signal. The delay circuit 11 delays the data of the input call signal by this delay amount and outputs data a. Data a is input to the phase comparison circuit 14 and the modulation circuit 12. The modulation circuit 12 modulates data a and transmits it to the downlink 31A.

Data from the central radio base station 10 travels around all of the peripheral radio base stations and is looped back at the final peripheral radio base station 20D. The returned data reaches the central radio base station 10 via the uplink which follows the same route as the downlink (has the same amount of delay).

The demodulation circuit 13 of the central radio base station 10 is folded back,
Demodulates data from the uplink 31B. The demodulated data C is input to the phase comparator circuit 14.

The phase comparator circuit 14 compares the phase of the data a sent to the downlink 31A with the phase of the return data C from the uplink 31B, and estimates the delay time due to the line up to the final peripheral wireless base station 20D. Then, a setting signal is generated for setting a delay in the delay circuit 11 corresponding to the delay time that is insufficient for the set delay time of the delay circuit 15 in the central radio base station 10. This setting signal is output to the delay circuit 11.

On the other hand, the delay amount of the delay circuit 15 is artificially set so that the delay amount due to the line from the central wireless base station 10 to the final peripheral wireless base station 20'b never exceeds the delay amount of the delay circuit 15. has been done. The delay circuit 15 delays the data of the input call signal by the set delay amount. Transmitter 16 wirelessly transmits data from delay circuit 15 via transmission antenna 16A.

Data transmitted from the central radio base station 10 to the downlink 31A is input to the peripheral radio base station 20A.

Data input to the peripheral wireless base station 2OA is input to the demodulation circuit 21 in FIG. 3. The demodulation circuit 21 demodulates the input data to generate data d.

This data d is input to a modulation circuit 229, a phase comparison circuit 25, and a delay circuit 26. The modulation circuit 22 modulates the data d and transmits it to the downlink 32A.

As already mentioned, the data transmitted to the downlink 32A travels around the surrounding wireless base stations and is sent to the final surrounding wireless base station 20.
Folds back at D. Then, it reaches the peripheral wireless base station 2OA.

The returned data from the uplink 32B is input to the demodulation circuit 23 of the peripheral wireless base station 20A.

A demodulation circuit 23 demodulates the returned data.

The demodulated data e is sent to the phase comparison circuit 25 and the modulation circuit 2.
4 is input. The modulation circuit 24 modulates the data C and transmits it to the central radio base station 10 via the uplink 31B.

The phase comparator circuit 25 is configured as shown in FIG. 4(a).
The downlink data d from the demodulation circuit 21 and the demodulation circuit 2
The phase difference is detected from the phase with the uplink data e from 3. Then, a setting signal f is used to estimate the phase of the data sent by the peripheral wireless base station 20D that loops back the data, and to set the delay time necessary to have the same phase as the data of the final peripheral wireless base station 20D. generate. The setting signal r is input to the delay circuit 26.

The delay circuit 26 is connected to the phase comparison circuit 25 by the setting signal r.
The demodulation circuit 2
Delay data d from 1. Then, delayed data g as shown in FIG. 4(a) is output to the transmitter 27. Transmitter 27 wirelessly transmits data g via transmission antenna 27A.

The peripheral radio base station 20B is similar to the peripheral radio base stations. That is, the peripheral radio base station 20B detects the phase difference between the downlink and uplink as shown in FIG. 4(b),
After delaying by half of the detected phase difference to equalize the phase of the peripheral wireless base station 20D that performs final data loopback, wireless transmission is performed.

Similarly, other peripheral wireless base stations detect the phase difference between the downlink and uplink, delay by half of the detected phase difference, and return the final data to the peripheral wireless base station 20D.
Transmit after making it equal to the phase of . Further, when data is returned as the final peripheral wireless base station 20D, the downlink output and uplink input may be directly connected.

However, in this embodiment, when the route of the line changes and the amount of delay to the final peripheral base station changes, in order to prevent the amount of delay of data sent by all peripheral wireless base stations from changing, the central wireless At the base station, it is necessary to compare the phases of uplink and downlink, adjust the amount of delay in the delay circuit inserted in the downlink, and make corrections so that the amount of delay to the final neighboring wireless base station is always constant. be.

In this way, according to this embodiment, when a large number of radio calling stations consisting of a central radio base station and a plurality of peripheral radio base stations transmit the same data simultaneously, data transmission (3 timings) between each radio calling station is possible. can be in-phase controlled.

Furthermore, when this embodiment is applied to a wide area wireless paging system, the number of lines can be reduced, making it possible to construct an economical system.

〔Effect of the invention〕

As explained above, in the present invention, each station is connected in series through a line, so that the economic burden of using the line is reduced. Furthermore, since phase correction is not performed using radio, phase compensation can be performed even in stations where it is difficult to receive radio waves from other wireless base stations.

Furthermore, since the phase correction operation does not include control of starting and stopping the transmitter, the station control circuit can be simplified.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
FIG. 3 is a configuration diagram of the central wireless base station in the embodiment shown in FIG. 1, FIG. 4 is a configuration diagram of the peripheral wireless base station in the embodiment shown in FIG. Figure 5 is a diagram illustrating the amount of phase correction. Figure 5 is a configuration diagram showing an example of a conventional inter-office automatic phase compensation method. Figure 6 is a wide area radio paging system to which the inter-office automatic phase compensation method of Figure 5 is applied. It is a block diagram which shows an example. 10... Central radio base station 20A to 20D... Peripheral radio base stations 31A to 34A... Downlink line 31B to 34B... Uplink line

Claims (1)

[Claims] (1) An automatic inter-station phase compensation system that compensates for the phase of data to be transmitted wirelessly. When data is input from the downlink, this data is looped back to the uplink, and the input data is transmitted wirelessly. When data is input from the downlink, the station outputs this data to the next downlink, and when data is input from the uplink, it outputs this data to the next uplink, and the final station outputs the data to the next uplink. Set a delay time so that the phase is the same as that of the data to be transmitted, and after this delay time, transmit this data input from the downlink to one or more intermediate stations that wirelessly transmit it, with a delay of a preset time. Data is wirelessly transmitted in the same phase as the final station, and the data transmission time from the time until the data output to the downlink is looped back by the final station and input from the uplink to the data transmission time to the final station. a first station that delays the data by this delay time and outputs it to the downlink, and sets a delay time based on this transmission time and a preset time, and outputs the data to the downlink after delaying the data by this delay time. The inter-station automatic phase compensation system is characterized in that the first station is connected to the final station via the one or more intermediate stations connected in series by a line.