RU2134487C1 - Method for simultaneous paging in paging system - Google Patents

Abstract

FIELD: communications engineering. SUBSTANCE: paging system has its terminal, set of base stations connected to paging-system terminal, and facility for transmitting fixed-period synchronizing pulse signal to paging-system terminal and to base stations which involves paging to base stations by paging-system terminals, page signal storage in base stations, generation of transmission interrupt signal for base stations by paging-system terminal during reception of synchronizing pulse signal upon paging, and synchronization of base stations by sync signal during reception of transmission interrupt signal for simultaneous transmission of stored page signal. EFFECT: provision for simultaneous paging. 6 cl, 5 dwg

Description

Technical field
The invention relates to a paging system, and more particularly to a method for transmitting a paging signal simultaneously from base stations by using a global satellite radiodetermination system (GPS) receiver.

State of the art
Typically, the paging system performs a radio call service. The radio call signal is transmitted to the subscriber receiver of the paging system (pager) of the corresponding region from the base station of a specific cell provided for by the cell plan. A paging signal (paging signal) is transmitted to all base stations for interrogation, and these base stations transmit a paging signal at the same time to prevent a pager from repeatedly receiving the same signal in an area covered by a plurality of base stations. Therefore, all base stations transmit a paging signal simultaneously.

 As shown in FIG. 1, a paging terminal 110 (paging terminal) connected to a T1 / E1 line transmits a signal from a trunk line to a first, second, Nth transmission line, encoding it. The signal transmitted from the paging terminal 110 includes a functional tone, a guard tone, and paging data. The first, second, Nth stations 112, 114, and 116 perform a radio call service by receiving a signal through a transmission line. Base stations 112, 114, and 116 transmit a radio frequency signal through their transmitter after compensating for differences for a plurality of signal transmission times of each base station with respect to signal acquisition time from paging terminal 110. Each base station sets a simultaneous transmission time by calculating a signal propagation time from a paging terminal to a corresponding one. base station.

 The paging terminal 110 transmits a signal for transmitting a signal for registering a signal transmission time from a given terminal to a first base station 112, and registers a signal arrival time back from a base station in a loop. The same principle applies to calculating the signal transmission time for the second base station 114 and the Nth base station 116.

 If the transmission time from the paging terminal 110 to the base station 112 is 500 μs, and the transmission time from the terminal 110 to the base station 114 is 1000 μs, then the base station 112 transmits an RF signal after a time interval of 500 μs, and the base station 114 transmits a signal immediately without delay. Therefore, the pager correctly receives the request data from the paging terminal 110. The pager can receive the radio frequency signal without error if the time difference of the simultaneously transmitted signals is less than one quarter of the transmission speed.

 The paging terminal 110 calculates a signal transmission time to each base station, and each base station transmits an RF signal simultaneously using the calculated time in a conventional paging system. However, there are errors, for example, in digital-to-analog and analog-to-digital conversion; the signal may be distorted due to the condition of the transmission line, in addition, there may be a change in the transmission line in the transmission sector for various reasons when calculating the propagation time of the signal. Difficulties arise when it is necessary to re-calculate the propagation time of a signal over a fixed period of time in case of replacement of the transmission equipment or change of the transmission line in the transmission sector. These errors reduce the efficiency of the paging system service, and therefore there is an urgent need to eliminate such errors.

SUMMARY OF THE INVENTION
An object of the present invention is to provide a method for simultaneously transmitting a paging signal in a paging system to establish the same transmission time in response to a synchronizing pulse signal of a GPS receiver.

 According to the present invention, in a paging system including a paging terminal, a plurality of base stations connected to a paging terminal, and means for continuously supplying a fixed-period synchronizing pulse signal to a paging terminal and base stations, a paging signal is simultaneously transmitted in accordance with by a method including transmitting a paging signal to a base station by a paging terminal, storing the paging signal by the base stations by providing a paging terminal with a transmission interruption signal for receiving base stations upon receiving a synchronizing pulse signal after transmitting a paging signal, and providing base stations with synchronization with a synchronizing signal upon receipt of a transmission interruption signal so as to enable simultaneous transmission of a stored paging signal.

Brief Description of the Drawings
In the future, the invention and its additional advantages are illustrated by the best options for its implementation with reference to the illustrative drawings, in which the same position denotes the same or analogue elements and which shows the following:
FIG. 1 is a block diagram of a conventionally known paging system (paging system);
2 is a block diagram of a paging system according to the present invention,
FIG. 3 is a waveform at a frequency of 1 pulse / s from the GPS receiver of FIG. 2
4 is a control flowchart in a paging terminal of a paging system according to the present invention,
FIG. 5 is a control flowchart in a base station of a paging system according to the present invention.

Preferred Embodiments
As shown in FIG. 2, the paging system terminal 110 (paging terminal) is connected to the T1 / E1 line and also connected to the base station 114 via a transmission line. The paging terminal 110 and base station 114 are connected to GPS receivers 212 and 222, respectively. The GPS receiver provides the location of a moving object using a navigation satellite, and it performs its function by calculating the phase difference of the reflected signals of many radio waves from the navigation satellite.

 At the paging terminal 110, the data input processor 214 is aligned with the T1 / E1 line. The paging system central processor 216 stores the paging system subscriber database and confirms whether the request signal from the input processor 214 is a signal from the subscriber or not by accessing the database. A network simultaneous transmission controller 218 connected to the central processor 216 converts the paging signal into a predetermined code (POSAG, GOLAY, NEC, etc.). The simultaneous transmission controller 218 receives a clock signal from a GPS receiver 212. The synchronizing pulse signal has one period of duration per second (1 pulse / s). The transmission line switching module 220 transmits an input signal from the simultaneous transmission controller 218 in the network to all base stations and from all base stations to the controller 218.

 In base station 114, interface means 224 for matching with paging terminal 110 are provided with interface means 224 connected to switching module 220. A memory 228 provides for storing data received from the controller 226, and the transmitter 230 converts the paging signal into an RF signal when controlled by the controller 226. The GPS receiver 222 sends a synchronizing pulse signal (1 pulse / s) to the controller 226 of the base station 114. The controller 226 receives and transmits various control signals in conjunction with the simultaneous transmission controller 218.

 Synchronizing signals with a frequency of 1 pulse / s (figure 3) from each receiver 212 and 222 of the GPS system are synchronized with each other. Time moments A and B are precisely synchronized with the corresponding time moments A 'and B'.

 As shown in FIG. 4, the data input processor 214 transmits the called number and related information to the central processor 216 upon detection of an input registered pager number from the caller. The central processor 216 sends the header code and associated information of the corresponding called number to the simultaneous transmission controller 218 after confirming the information from the input processor 214 stored in the database. The controller 218 receives information from the central processor 216 in step 410 and encodes it in step 411. In step 412, the controller 218 transmits a paging signal to the switching module 220, and the paging signal is transmitted to each base station using the switching module 220. After transmitting the paging signal, the controller 218 detects the presence of a leading edge (point 'A') of a pulse with a frequency of 1 pulse / s from the GPS receiver 212 in step 413. If there is a leading edge at point 'A', the controller 218 transmits a transmission interrupt signal through the module to mmutatsii 20 to each base station.

 The controller 226 (FIG. 5) of the base station 114 receives the paging signal from the controller 218 in step 510 and stores it in the memory 228 (with random access) in step 511. Then, the controller 226 checks whether or not a transmission interrupt signal has been received from the paging terminal 110 at step 512. After receiving the transmission interrupt signal, the controller 226 detects the presence of a leading edge (sense 'B') of a pulse with a frequency of 1 pulse / s from the GPS receiver 222 in step 513. If there is a leading edge at point 'B', the controller 226 transmits a paging signal stored in memory 228 to transmitter 230. Transmitter 230 converts the received paging signal to an RF signal, and each base station transmits a paging signal at the same time as B '.

 Thus, the present invention provides a means for setting a synchronized time point for transmitting a paging signal simultaneously from each base station using a 1 pulse / s signal from a GPS receiver 212 and 222 by connecting GPS receivers 212 and 222, a paging terminal 110, and a base stations 114 with each other.

 The traditional system of simultaneous transmission provides the possibility of paging services with a speed of about 1200 bits / s due to errors in calculating the transmission time.

 The present invention enables paging at 2400, 4800 and 6400 bps. The proposed method for simultaneous transmission using a synchronizing signal with a frequency of 1 pulse / s from the GPS receiver guarantees high performance and improved quality of paging services.

Claims (6)

 1. A method for simultaneously transmitting a paging signal in a paging system comprising a paging system terminal, a plurality of base stations connected to a paging system terminal, and means for supplying a fixed period synchronizing pulse signal to a paging system terminal and base stations, characterized in , which includes the transmission by the terminal of the paging system of the paging signal to the base stations, storing the paging signal in the base stations, the liver of a paging system terminal generating a transmission interruption signal for said base stations upon receiving a synchronizing pulse signal after transmitting a paging signal, and synchronizing base stations with a synchronization signal upon receipt of a transmission interruption signal to simultaneously transmit a stored paging signal.  2. The method according to claim 1, characterized in that the synchronizing pulse signal is a signal generated by the global satellite radio detection system with a period of 1 pulse / s.  3. A method for simultaneously transmitting a paging signal in a paging system, comprising means for generating a synchronizing pulse signal with a fixed period, a paging system terminal and a plurality of base stations connected to a paging system terminal for storing a paging signal transmitted by a paging system terminal, for simultaneously transmitting the paging signal in response to the synchronizing pulse signal after receiving the transmission interrupt signal, from ichayuschiysya that includes encoding the paging signal transmitted to the base stations, and generating a transmission interrupt signal to said base station when receiving the synchronizing pulse signal.  4. The method according to claim 3, characterized in that the synchronizing pulse signal is a signal generated by the global satellite radio detection system with a period of 1 pulse / s.  5. A method for simultaneously transmitting a paging signal by base stations in a paging system comprising means for generating a synchronizing pulse signal with a fixed period, a paging system terminal for transmitting a paging signal with a transmission interrupt signal generated in response to a synchronizing pulse signal, and a plurality of base stations connected to the terminal of the paging system, characterized in that it includes storing a paging signal, an appeal to a remembered paging signal when receiving a transmission interrupt signal and transmitting the paging signal that was being accessed in response to a synchronizing pulse signal.  6. The method according to p. 5, characterized in that the synchronizing pulse signal is a signal generated by the global satellite radio detection system with a period of 1 pulse / s.

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