JPH02174428A - Delay adjustment system - Google Patents

Abstract

PURPOSE:To effectively adjust the delay time of each radio base station by counting the time of a signal sent from a control station till it is folded in each radio base station and deciding the delay time. CONSTITUTION:Plural radio base stations (2-1), (2-2)-(2-N) are connected in cascade with a control station 1 respectively, and each radio base station 1 is provided with a transmitter Tx1, Tx2-TxN and a delay circuit DL1, (DL2- DLN) connecting to the transmitter. Moreover, a receiver Rx1, (Rx2-RxN) receiving only a signal sent from its own station is provided. Then the time till the signal sent from the control station 1 is folded in the radio base stations (2-1), (2-2)-(2-N) is counted and decided. Then a signal is sent from a transmission control section 6 by a command from a main control section 4 in the control station 1, the signal is received by a base station, and a signal is sent from the transmitter through a delay circuit in the adjustment of the delay time. When the signal from the transmitter is received by the receiver of its own station, a reception control section 7 adjusts the delay time.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 5) Means for solving the problems to be solved by the invention (Figure 1) Working examples (Figure 2) , Fig. 3, Fig. 4) Effects of the invention [Summary] Regarding the delay adjustment method, it is not necessary to find a place to install a receiving station for delay adjustment, and the delay can be easily corrected even when the connection line length changes. It consists of one control station and multiple radio base stations, and is designed to make the timing of the signals transmitted from the radio base station the same for all radio base stations. In the delay adjustment method, a plurality of wireless base stations are connected in cascade to a control station, and each wireless base station has a transmitter, a delay circuit connected to the transmitter, and a A receiver that receives only the ε signal is installed, and the signal sent from the control station is
The configuration is configured to adjust the delay time of each radio base station by measuring and determining the time it takes for each radio base station to return.

[Industrial application field]

The present invention relates to a delay adjustment method, and more specifically,
Delay time adjustment that eliminates the need to install a receiving station used to adjust the timing of transmitting signals in mobile communications such as radio paging systems (e.g. pagers), and makes it easy to adjust the delay time. Regarding the method.

[Conventional technology]

BACKGROUND ART Conventionally, in mobile communications such as radio paging systems such as pagers, it is necessary to make the transmission timing of signals transmitted from a non-VAA base station the same for all radio base stations.

Therefore, conventionally, a delay adjustment method as shown in FIG. 5 has been used.

l is the control station, CON is the control device in the control station, 2-1.2
-2,...2-N are wireless base stations, DL1, D, respectively.
L2-D LN are delay circuits 11, 12-1!, respectively, provided in the control station 1! , is the length of the connection line between the control station 1 and each radio base station 2-1, 2-2, -2-N, 3 is the receiving station, 1, l is the length of the line between the control station 1 and the receiving station 3. It is the length.

As shown in the figure, conventionally, from a control station l to each radio base station 2-1.
The connection lines to 2-2 and -2-N were installed separately.

In addition, a connection line (length I!0) between the receiving station 3 and the control station 1 for delay adjustment was also separately drawn.

In order to adjust the sending timing U8 of the signal sent from each radio base station 2-1.2-2, -2-N, each radio base station 2-1.2-2, -2-N performs control. The adjustment signal sent from the station is sent out, received by the receiving station 3, and then sent to the control station l.

In the control station 1, an internal control device determines the received signal, and if delay adjustment is necessary, the delay circuits (DL1, DL2-DL
Adjust either (or) of N.

In this way, the timing of sending out signals from all wireless bases is adjusted.

[Problem to be solved by the invention]

The above-mentioned conventional devices had the following drawbacks.

+11 Since one receiving station for delay adjustment needs to receive signals from multiple wireless base stations, it is difficult to find a location for installing the receiving station, and there is no space for installing the receiving station. is also necessary.

(2) A connection line from the receiving station to the control station is required.

(3) When the line length between the control station and each wireless base station changes, it is necessary to individually adjust the delay time corresponding to each non-VAA base station, which is troublesome.

The present invention solves the above-mentioned drawbacks of the conventional technology, eliminates the need to search for a location to install a receiving station for delay adjustment, and eliminates the need for changing the length of the connection line between the control station and each wireless base station. The purpose is to facilitate delay time adjustment when

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the delay adjustment method according to the present invention.

For the control station 1, a plurality of wireless base stations 2-1.2-2,
...Connect 2-N in cascade.

Each radio base station 2-1.2-2, -2-N includes a transmitter (Tx1, Tx2,...TxN) and a delay circuit (DL1, TxN) connected to this transmitter. DL2, DLN
) and receivers for delay time adjustment (Rx1, Rx2, -R
x N ) at the same location.

The receiver (Rx1, Rx2,...RxN)
- Adjust so that each station can only receive signals (radio waves) from its own transmitter.

The delay time adjustment is based on the time it takes for each radio base station 2-1, 2-2, . This is determined by measurement, and for radio base stations that require delay time adjustment, the delay circuit within that station is set to a predetermined value and adjusted. This adjustment is performed by setting the delay time according to instructions from the control station l.

[Effect]

As described above, since each radio base station is provided with a receiver for delay time adjustment, there is no need to provide a separate receiving station as in the conventional case.

Furthermore, since each radio base station is cascade-connected, for example, if the length of the connection line changes between the M-1st and M-th radio base stations from the control station side, - It is sufficient to adjust the delay time at each of the first radio base stations, and there is no need to adjust the delay times at the M-th and subsequent radio base stations.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.
The figure is a diagram showing a delay adjustment method that is an embodiment of the present invention.

Reference numeral 1 denotes a control station, in which a main control section 4, a line connection section 5, a transmission control section 6, a reception control section 7, an interface section 8, etc. are provided.

2-1.2-2 and -2-N are wireless base stations, and each non-VA base station includes a transmitter (Tx1, Tx2).
, -T x N ), a delay circuit (DL1, DL2, ...DLN) connected to this transmitter, and a receiver (
Rx1, Rx2, -RxN) are provided at the same location.

The receivers (Rx1, Rx2, -RxN) provided in each of the radio base stations 2-1, 2-2, -2-N are adjusted to receive only the radio waves of the own station.

For example, in the wireless base station 2-1, the receiving sensitivity is lowered so that only the radio waves sent from the transmitter Txl are received by the receiver Rxl, and the radio waves from other stations are received by the receiver Rxl.
Make sure not to receive it.

Similarly, at the radio base station 2-N, the reception N
The RxN is configured not to receive radio waves from other stations, and only the radio waves sent from the transmitter TxN of the own station are received.

Each radio base station 2-1, 2-2, -2-N is configured to be cascade-connected to a control station.

The transmitter and delay circuit of the radio base station are connected to the transmission control unit 6 in the control station 1, and the receiver of the radio base station is connected to the transmission control unit 6 in the control station 1.
Connect to the reception control section 7 inside.

When adjusting the delay time, a signal is sent from the transmission control section 6 in response to a command from the main control section 4 in the control station 1.

After this signal is received by the non-VAA base station, it passes through a delay circuit and is output from the transmitter.

When the receiver of its own station receives the signal (radio wave) from this transmitter, it sends this received signal to the reception control section 7 of the control station. The reception control section 7 is composed of a control section and a delay circuit, and the delay circuit can be set to either DLL or DLN according to a command from the main control section.

For example, when the mobile base station 2-1 is being controlled, the delay circuit 7 is set to the same value as the DLI, so that the delay times on the outbound and return routes are the same.

The main control unit 4 determines the signal from the reception control unit 7, and if delay adjustment is necessary as a result, it is done by setting the adjusted delay time in the delay circuit in the corresponding mobile base station.

For example, for the mobile base station 2-1, the transmission control unit 6-
The determination is made by measuring the signal return time along the path of delay circuit DLl of mobile base station 2-1, transmitter Txl, receiver Rx1, and reception control unit 7 under the control of main control unit 4.

In the same manner, the return time of the signal to each wireless base station is measured and determined, and if the delay time needs to be adjusted, it is adjusted by adjusting the delay circuit in the corresponding mobile base station. .

FIG. 3 is a timing diagram in a normal state in the embodiment shown in FIG. The propagation time is T
(/x) seconds.

T(/l)+T(12) seconds for the radio base station 2-2, T(Ilr)+'r for the radio base station 2-N
” (ffi 2) +---10 T (An) seconds.

Also, the delay time of the delay circuit, DLI, is T (D
L 1), DL2 is T (DL2) -DLN is T
(DLN).

A transmission signal to each radio base station 2-1.
['Adjust the delay times of the delay circuits DL1, DL2, . . . DLN so as to reach x1, Tx2, -T x N.

That is, from the control station l to each radio base station 2-1.22, -2-
The time required for a signal to reach each transmitter 'l'x1, Tx2, -T xN of N is T(j21>10T (DL
I)=T(j! 1) 10T(β2) +T(D
L2)=T(j! t)+'[” (/ 2)+ −+
Adjust so that T(1,4)+T(DLN)=Tt.

In this way, each radio base station 2-1, 2-2 at time Tl
, -2-N transmit signals all at once.

FIG. 4 is a timing diagram when some of the connection lines between the control station and the radio base station become longer in the embodiment of FIG. 2.

In a normal case, that is, if the delay time is adjusted correctly, the time it takes for a signal to reach the transmitter of each wireless base station is constant at TI, as described above, and T (lt) + T (DL 1) =T (1t) +T (j!2
) +T (D L 2) =-=T (j! ri 10T <12)+T (13)+-...10T C1
There is a relationship: s ) = T t.

Now, for example, assume that the connection line between the radio base stations 2-1 and 2-2 has become longer from 12 to 12+Δ12.

At this time, the time for the signal to pass through Δ12 is T(Δj22)
Then, in the wireless base station 2-2, TI is T1+T(Δ
j22)=Ta.

In this case, the radio base station 2-1 remains in TI, but
For the radio base stations 2-2, 2-3, -...1-N, the length becomes Tx+'r''(Δ12)=Ta.

Therefore, in order to adjust the time, adjust the delay time of the wireless base station on the control station side before the wireless base station 2-2 so that TI becomes T! Just do it.

In this example, it is sufficient to adjust only the delay circuit DLl of the radio base station 2-1 to lengthen it by T (Δ12).

In this way, in the radio base station 2-1, the time for the signal to reach the transmitter Txl becomes Tt + T (Δf = T*, and from the radio base station 2-2 to 2N, the time required for the signal to reach the transmitter Txl is T (Δ12).
This makes it possible for all wireless base stations to transmit signals at the same time at time T2.

Generally, if there is a change in the length of the connection line (sometimes it gets longer and sometimes it gets shorter), for example, if it is between M-1st and Mth of the wireless base station, then from the 1st M
It is only necessary to adjust the time at each of the radio base stations up to -1, and there is no need to adjust the time at the M-th to N-th (MAN) radio base stations.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

fl) Since there is no need to separately provide a receiving station for delay time adjustment, there is no need to search for a place to install it.

(2) Even if the connection line between the control station and the radio base station changes, it is only necessary to adjust the delay time for some radio base stations, making it easy to adjust the delay time.

(3) Since there is no need to provide a separate receiving station, there is no need for a connection line.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the delay adjustment method according to the present invention, Fig. 2 is a diagram showing the delay adjustment method as an embodiment of the invention, and Fig. 3 is a normal state in the embodiment shown in Fig. 2. FIG. 4 is a timing diagram for the embodiment shown in FIG. 2 when the line length of the connection line becomes longer, and FIG. 5 is a diagram showing a conventional delay adjustment method. ■-Control station 2-1.2-2, Dx1, Dx2, Tx1, Tx2, Rx1, Rx2. 2-N-Radio base station D x N -Delay circuit/T x N-Transmitter/RxN-...Receiver Patent applicant Fujitsu Ltd. Representative patent attorney Akira Yamatani Sakae 12 type] We

Claims (1)

[Claims] One control station (1) and a plurality of radio base stations (2-1, 2-2,...2-N
), and in a delay adjustment method for making the transmission timing of signals transmitted from a wireless base station the same for all wireless base stations, a control station (1) is configured to transmit a signal from a plurality of wireless base stations (2-1 ,2
-2, ...2-N) are connected in cascade, and each radio base station (2-1, 2-2, ...2-N) is connected to a transmitter (Tx1, Tx2 ,...TxN) and
Delay circuits (DL1, DL2, etc.) connected to this transmitter
...DLN) and a receiver (Rx1) that receives only the signals transmitted from its own station.
, Rx2, ......RxN), and the control station (
1) A delay adjustment method characterized in that the delay time of each radio base station is adjusted by measuring and determining the time it takes for a signal transmitted from the radio base station to return at each radio base station.