JPH06303182A - Inter-office phase synchronizing system and device used for this - Google Patents

Abstract

PURPOSE:To simplify a device constitution and to improve the information efficiency of a calling signal by providing highly accurate clocks on a central office and a peripheral office, compensating the delay amount of a variable delay device by the peripheral office by the timing obtained from the clock and transmitting the calling signal. CONSTITUTION:High performance clocks 10 to 12 are provided on a central office 1 and peripheral offices 60 and 61, and the office 1 simultaneously transmits the time information of the clock 12 and the transmission designation time of the calling signal from the inter-office delay amount from a signal preparation part 13 by including them in frame signals. The offices 60 and 61 transmit frame signals by the timing of the transmission designation time of the office 1 based on the time information of the clocks 10 and 11. When the change of delay amount and jitters are generated due to the route switching, etc., of inter-office repeating lines 20 and 21, the cycles of the frame signals are changed. Therefore, phase synchronizing control parts 30 and 31 monitor the cycles and adjust the delay amount of variable delay devices 70 and 71 from the detection result of a phase delay. Thus, the information efficiency of the calling signal is improved, the reception, connection and disconnection control of radio waves of the offices 60 and 61 become unnecessary and a device constitution is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in a radio selective calling system. In particular, it relates to effective utilization of the information area of a calling signal and phase delay synchronization technology.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIGS. FIG. 5 is an overall configuration diagram of a conventional example. FIG. 6 is a block diagram of a conventional device. FIG. 7 is a diagram showing the format of a conventional frame signal. FIG. 8 is a diagram illustrating a conventional phase synchronization method. As shown in FIG. 5, one service area is composed of a plurality of wireless zones. The central station 1 creates a ringing signal to be transmitted to the wireless section, and transmits the call signal to the peripheral station 60 via the trunk lines 20, 21, ..., 2n.
61, ..., 6n are transmitted all at once. The ringing signals transmitted from the central station 1 all at once are transmitted to the peripheral stations 60, 61, ..., 6n after transmission delay times τ0, τ1, ... At this time, in the place 4 where the zones overlap, the peripheral stations 60, 6
When the electric field strengths of the radio waves transmitted from each of 1 are almost equal and the radio propagation delay of each radio wave is ignored,
In the phase of the ringing signal received by the receiver 5, the relay line 20 ...
It is known that there is a phase difference caused by a propagation delay difference | τ0−τ1 | of 2n, and this phase difference significantly reduces the reception rate. Inter-station phase compensation is necessary to compensate for this phase difference.

FIG. 6 shows an example of phase compensation used in a conventional radio paging system. The central station 1 creates a ringing signal to be transmitted in the wireless section, and simultaneously transmits it to the peripheral stations 60 and 61 via the trunk lines 20 and 21. In the peripheral stations 60 and 61,
Variable delay devices 70 and 71 for performing phase compensation, phase compensation antennas 80 and 81, and phase compensation controller 9
0 and 91 and transmitters 100 and 101 are provided, respectively. The variable delay devices 70 and 71 are provided with buffers, and call signals are temporarily stored in the buffers and read under the control of the phase compensation control units 90 and 91.

FIG. 7 shows the format of a frame signal transmitted in the wireless section. A frame signal is formed by connecting a ringing signal having a fixed length to one frame synchronization signal and further connecting a phase compensating signal having a fixed length. The phase compensation signal is composed of a specific bit pattern for phase compensation. An infinite number of frame signals configured in this way are transmitted to the wireless section.

FIG. 8 has the block configuration of FIG.
2 shows a phase compensation method using the ringing signal format of.
One of the peripheral stations 60 and 61 serves as a phase compensation reference station, and the other serves as a phase compensation station. Each of the peripheral stations 60 and 61 has a function capable of becoming a phase compensation reference station or a phase compensation station, but either of them is set by the control of the central station 1. Here, the peripheral station 60 will be described as a phase compensation reference station, and the peripheral station 61 will be described as a phase compensation station.

The peripheral station 61, which is a phase compensation station, constantly detects the frame synchronization signal and the phase compensation signal from the frame signal received by the phase compensation antenna 81.
The time from the detection of the frame synchronization signal to the detection of the phase compensation signal is monitored by the phase compensation control unit. When the phase compensation station performs phase compensation, the output of the transmitter of the phase compensation station is cut off in order to reliably receive the radio wave of the peripheral station 60 which is the phase compensation reference station at the timing when the phase compensation signal is transmitted. The phase compensation signal transmitted from the reference station is detected. Here, since the transmission times of the frame signals of the peripheral station 61, which is the phase compensation station, and the peripheral station 60, which is the phase reference station, are time T0 and time T0 + ε, respectively,
The detection time from the frame signal to the phase compensation signal in the phase compensation station is shorter by ε than when the phase is accurate. Therefore, the phase compensation control unit 91 of the phase compensation station can match the phase of the frame signal of the phase reference station by compensating the variable delay amount by ε.

[0007]

However, this method has a drawback that the information rate of the paging signal is lowered because the time slot for the phase compensation signal is set in the frame signal to be transmitted. In addition, since a high-power transmitter is frequently connected and disconnected in each peripheral station, a device for suppressing power supply fluctuation must be added to the power supply device. Further, since each peripheral station needs to receive the radio wave of the phase reference station which is another peripheral station, a new device is required to synchronize the phase of the peripheral station isolated from the adjacent station.

The present invention has been made against such a background, and provides an inter-station phase synchronization system and a device used therefor which can effectively utilize the information area of a calling signal and simplify the hardware configuration of the device. The purpose is to provide.

[0009]

The first aspect of the present invention is to:
A service area is composed of a plurality of wireless zones, a plurality of central stations provided for each service area, and a plurality of central areas that are connected to the central station by a relay line and that are provided for each of the wireless zones and that transmit a call signal to a wireless terminal. And a means for generating a call signal including the identification number of the wireless terminal and phase compensation information for compensating the phase of the call signal, and the frame configuration of the call signal and the phase compensation information. Means for sequentially time-multiplexing and transferring to the peripheral station, the peripheral station means for temporarily holding the framed signal and means for reading and transmitting from the buffer according to the phase compensation information. It is an inter-station phase synchronization system equipped with and.

A feature of the present invention is that the central station and the peripheral stations are provided with clock means, the phase compensation information includes time information, and the transmitting means has the time information. It includes a means for transmitting at a time according to the following. It is preferable that the time information includes transmission time designation information of the calling signal, and the transmitting unit includes a unit that transmits the calling signal when the current time matches the value of the transmission time designation information.

Further, since the ringing signal is transmitted at a constant cycle, the phase compensation information is multiplexed on this ringing signal at equal intervals. Therefore, the transmitting means can detect the phase delay of the paging signal from the arrival interval of the phase compensation information. When the phase delay is detected according to the detection result, the means for compensating the phase delay may be activated. Further, the above-mentioned equal intervals can be configured to be every second or every one minute.

A second aspect of the present invention is a central station apparatus and peripheral station apparatus used in this inter-station phase synchronization system.

[0013]

[Operation] High-precision clocks are installed at the central station and peripheral stations,
Each peripheral station compensates the delay amount of the variable delay device according to the timing obtained from the clock installed in each peripheral station and transmits the call signal.

As a result, it is not necessary to always insert a signal for phase compensation into the frame signal to be transmitted, and it is possible to achieve phase synchronization between stations without performing control by disconnecting the transmitter. Further, it is possible to achieve phase synchronization of the calling signals between the peripheral stations that the radio waves of each other do not reach.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention.

According to the present invention, a service area is constituted by two wireless zones, a central station 1 provided for each service area, and a central area 1 connected to the central station 1 by relay lines 20 and 21 and provided for each wireless zone. Two peripheral stations 6 for transmitting a calling signal to the receiver 5 which is a wireless terminal.
0, 61, the central station 1 generates a ringing signal including the identification number of the receiver 5 and phase compensation information for compensating the phase of the ringing signal, and a frame configuration of the ringing signal and the phase compensation information. The peripheral stations 60 and 61 each include a buffer for temporarily holding the frame-structured signal and the phase compensation from the buffer. Variable delay device 7 including means for reading and transmitting according to information
It is an inter-station phase synchronization system with 0 and 71.

Here, a feature of the present invention is that the central station 1 and the peripheral stations 60 and 61 are provided with clocks 10 to 12, and the phase compensation information includes time information and a variable delay device 70, Reference numeral 71 is where the means for transmitting at the time according to this time information is included. The time information includes transmission time designation information of the calling signal, and includes the variable delay device 7
0 and 71 include means for transmitting a calling signal when the current time matches the value of the transmission time designation information.

Further, the ringing signal is sent out at a constant period T, the phase compensation information is multiplexed on this ringing signal at equal intervals, and the variable delay devices and buffers 70 and 71 change the phase compensation information from the arrival interval of the phase compensation information. The configuration is such that the phase delay of the calling signal is detected and the control for compensating the phase delay is performed according to the detection result.

Next, the format of the frame signal used in the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing a format of a frame signal used in the embodiment of the present invention. The unique word is divided into a frame synchronization pattern and a system signal related to system information, and is transmitted in a constant cycle T. The system signal is an information signal related to the system and includes an area code and the like.

The central station 1 is provided with a signal producing section 13 for producing a transmission signal and a clock 12, and the peripheral stations 60, 61 are provided with variable delay devices 70, 71 and a phase synchronization control section 3.
0, 31 and clocks 10, 11 and transmitters 100, 1
01 is installed.

First, the initial operation in which the central office 1 starts or resets the phase compensation will be described. Time information obtained from the installed clock 12 and the central station 1 and peripheral stations 6
Based on the maximum delay amount between 0 and 61, the designated time for transmitting the calling signal is transmitted to each of the peripheral stations 60 and 61 as a part of the system information of the frame signal. In FIG. 2, the phase compensation operation is started by the (k + 2) th frame signal. Next, in the peripheral stations 60 and 61, based on the time information obtained from the clocks 10 and 11 installed in the respective peripheral stations 60 and 61, this frame is transmitted at the timing of the transmission time designated by the central station 1. Send a signal.

Next, the phase compensation operation in the steady state will be described. Usually, in many cases where phase compensation is required, the relay line 20 connecting the central station 1 and the peripheral stations 60, 61,
21. The change in the delay amount and the occurrence of jitter due to the switching of the route and the like occur at 21. In this way, when the delay amount change jitter occurs on the relay lines 20 and 21, the cycle T of the frame signal sent from the transmission line changes. Therefore, the phase synchronization control units 30 and 31 monitor the cycle,
When the frame signal is not detected in the constant period T, the system signal of the frame signal to be transmitted is detected and the delay amount is adjusted.

As a result, it is not necessary to always allocate the time slot of the phase compensation signal to the format of the frame signal, and the information efficiency can be improved. Further, since it is not necessary to receive the radio wave of the phase reference station, it is not necessary to control the disconnection of the transmitter. Further, phase synchronization in an isolated station where radio waves do not reach from an adjacent station can be easily realized by the same configuration.

Next, another frame signal format of the embodiment of the present invention will be described with reference to FIGS. 3 and 4 are diagrams showing formats of other frame signals according to the embodiment of the present invention. FIG. 3 shows the peripheral stations 60, 6 as a part of a paging signal including a special address that does not assign the transmission time designation information to general subscribers.
It is transmitting all at once. As a result, not only the unique word area but also the transmission time designation information can be inserted and used at an arbitrary position of the calling signal.

In FIG. 4, the transmission time designation information is every second or every minute. As a result, the transmission time designation information is
A simple number of information such as “1”, “2”, ..., “30”, ... Is sufficient, and the transmission time designation information area can be reduced. Further, the phase synchronization control in the central station 1 and the peripheral stations 60 and 61 can be simplified because they are all processed by a simple number of information.

[0026]

As described above, according to the present invention, it is possible to improve the information efficiency of the calling signal while performing the phase synchronization between the stations, and it is not necessary to receive the radio waves of the adjacent peripheral stations, and the power source is used. Since it is not necessary to control the connection and disconnection frequently, the hardware configuration of the device can be simplified.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a format of a frame signal used in the embodiment of the present invention.

FIG. 3 is a diagram showing a format of another frame signal according to the embodiment of the present invention.

FIG. 4 is a diagram showing another frame signal format according to the embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a conventional example.

FIG. 6 is a block diagram of a conventional device.

FIG. 7 is a diagram showing a format of a frame signal of a conventional example.

FIG. 8 is a diagram illustrating a conventional phase synchronization method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central station 5 Receiver 10, 11, 12 Clock 20-2n Relay line 30, 31 Phase synchronization control part 60-6n Peripheral station 70, 71 Variable delay device 80, 81 Phase compensation antenna 90, 91 Phase compensation control part 100 , 101 transmitter

Claims (5)

[Claims] 1. A service area is composed of a plurality of wireless zones, a central station provided for each of the service areas, and a call to a wireless terminal provided for each of the wireless zones and connected to the central station by a relay line. A plurality of peripheral stations transmitting signals, the central station generating a ringing signal including the identification number of the wireless terminal and phase compensation information for compensating the phase of the ringing signal, and the ringing signal and the phase. Means for transferring the frame-compensated compensation information to the peripheral station in a time-sequential manner and transferring the frame-complexed signal to the peripheral station, the peripheral station according to the phase compensation information from the buffer for temporarily holding the frame-structured signal. In the inter-station phase synchronization system including a means for reading and transmitting, in the central station and the peripheral station clock means is provided, the phase compensation information, It contains time information, the means for transmitting, interoffice phase synchronization method, characterized in that it includes means for transmitting to the time according to the time information. 2. The time information includes transmission time designation information of the paging signal, and the transmitting means includes means for transmitting the paging signal when the current time matches the value of the transmission time designation information. The inter-station phase synchronization system according to claim 1, including the phase synchronization system. 3. The ringing signal is transmitted at a constant cycle, the phase compensation information is multiplexed on the ringing signal at equal intervals, and the transmitting means is configured to delay the phase delay of the ringing signal from the arrival interval of the phase compensation information. 2. The inter-station phase synchronization system according to claim 1, further comprising: a means for detecting the signal and a means for compensating the phase delay according to the detection result of the detection means. 4. The inter-station phase synchronization system according to claim 3, wherein the equal intervals are every one second or every one minute. 5. A central station device and a peripheral station device used in the inter-station phase synchronization system according to claim 1.