RU2173026C2 - Circuit delaying reference signal of synchronization from receiver of global satellite system of radio positioning, method of simultaneous transmission of search call - Google Patents

Abstract

FIELD: radio communication. SUBSTANCE: invention refers to circuit and method which provide for simultaneous transmission of data of search call in system of search call with the use of delay of reference signal of synchronization from global satellite system of radio positioning. Method of transmission of data of search call in system of search call includes stages of input of reference signal of synchronization from receiver of global satellite system of radio positioning into aggregate of controllers of transmitters, its delay by value of 1-X seconds for its input into each controller of aggregate of transmitters ( value X is time delay related to transmitter coupled to each controller of transmitters ), transmission of data of search call from aggregate of controllers of transmitters to each transmitter in correspondence with delayed synchronization signal and simultaneous transmission of data of search call from aggregate of transmitters. By virtue of this fact simultaneous transmission of data of search call is synchronized by reference signal of synchronization from receiver of global satellite system of radio positioning despite time difference of transmission related to each transmitter. EFFECT: possibility of simultaneous transmission of data of search call synchronized by reference signal of synchronization from receiver of global satellite system of radio positioning. 7 cl, 4 dwg

Description

BACKGROUND OF THE INVENTION
1. The technical field to which the invention relates.
The present invention relates to a circuit and method for transmitting paging data in a paging system, and more particularly, to a circuit and method for delaying a synchronization reference signal from a receiver of a global satellite radiodetermination system for simultaneously transmitting paging data in a paging system.

2. Description of the related field of technology
A conventional paging system offers various types of wireless call services for each pager (paging receiver) in the system. The paging system includes a plurality of base nodes that offer call service for a cell (i.e., a specific area). Each base node receives call data from the terminal equipment of the paging system and sends a call signal over the air to a pager in a suitable area. Each base node must simultaneously send data to the paging system in such a way as to prevent the terminal equipment from receiving pagers (located in the overlapping area of the cell) of identical signals from many base nodes and reduce the error rate of received data.

 Historically, various methods have been used to transmit paging data simultaneously. Nowadays, the popular method for providing simultaneous transmission of paging data uses a receiver of the global satellite radiodetermination system ("GSSR") to synchronize the transmission of paging data by absolute time. The GSSR system is a satellite radio communication system that uses various satellites orbiting the earth to determine the location or direction of moving bodies, such as aircraft and ships. The method of operation of the GSSR receiving device includes transmitting numerous full-period waves to the satellite and measuring the phase shift between the transmitted wave and the wave received from the satellite. A typical paging data method using a GSSR receiver includes sending synchronized paging data based on absolute time information from a high speed paging system with a high speed paging protocol.

 In general, the paging system can be divided into paging terminal equipment, which generates paging data from information received from the subscriber, and a base node that receives paging data from the paging terminal equipment and transmits a radio relay frequency to the corresponding pager. The base unit portion of the paging system can further be divided into (1) a transmitting device control portion for combining the paging data (received from the paging terminal equipment) with a corresponding protocol that synchronizes the received paging data in accordance with the absolute time information (i.e. reference synchronization signal) from the receiving device of the GSSR and sending the received paging data to the (2) section of the transmitting device in which the received data The paging call is modulated by the radio relay frequency and then transmitted to the corresponding pager.

 Because the paging data synchronization method is based on a paging system using a high speed paging protocol, the transmitter controller associated with each base node must determine in advance the exact time at which paging data should be sent. This determination is made based on the received paging data and the reference system information from the paging terminal equipment. Then, at a certain time, the controller of the transmitting device sends the paging data to the transmitting device, in which the paging data is modulated on the radio frequency and then transmitted. As shown above, the controller of the transmitting device is responsible for organizing all the time information and for synchronizing and transmitting paging data to the transmitting device.

 There are several problems associated with the actual implementation of the conventional method for transmitting paging data simultaneously, as described above. Firstly, since the configuration of the simultaneous transmission of paging data is based on the installation of terminal equipment paging, only the controller of the transmitting device takes into account the timing of the transmission of data paging (i.e., the transmitting device cannot take into account these aspects). In other words, even if the controller of the transmitting device synchronizes the transmission of the paging data based on the absolute time information, the transmitting device can only perform frequency modulation and transmission of the paging data received from the controller of the transmitting device. In addition, even if the controller of the transmitting device sends the paging data to the transmitting device at an appropriate time (i.e., the determined time described above), there is no way to compensate for the time delay that may occur between the time at which the transmitting device receives and modulates the search data call, and the time at which it transmits this data.

 With reference to FIG. 1 of the prior art, there is shown a timing diagram for transmitting paging data from a controller of a transmitting device and transmitting radio relay data of a paging call from a transmitting device in accordance with a reference synchronization signal, 1IVS (pulse per second) from a GSSR. In particular, FIG. 1 (a) illustrates the signal 1IVS from the GSSR. FIG. 1 (b) illustrates a timing diagram of the transfer of paging data from the controller of the transmitting device to the transmitting device, which are synchronized in absolute time of n seconds. FIG. 1 (c) illustrates a paging data synchronization signal, which is a reference read in paging data from a transmitter. FIG. 1 (d) shows a timing diagram of the transmission of received paging data (which is modulated by the radio frequency) from a transmitter.

 In FIG. 1 (b), the controller of the transmitting device is synchronized in absolute time of n seconds, whereby the paging data as well as the transmission synchronization signal are sent to the transmitting device.

 The transmitter receives the transmitted synchronization signal and reads the paging data in response to the front of each synchronization signal. The transmitter then modulates the paging data on the radio frequency and transmits it.

 As shown in FIG. 1, there is a time delay associated with the reading of the paging data by the transmitting device, which is called a data sampling delay (“STD”), as well as a time delay associated with the modulation process of the paging data (which is read) on the radio frequency, which is called the frequency delay modulation ("ZCHM"). Assuming that the sum of these two delay time periods is the total delay time (X) of the transmitting device, from FIG. 1, it becomes clear that the actual time of transmission of the paging data from the transmitter cannot be synchronized in absolute time n. In particular, the paging modulated data is transmitted with a time delay X (i.e., a delay time of the transmitting device), compared with the absolute time n.

 There are various differences in the delay time periods between currently available commercially available transmitting devices. Even the transmitting devices that are assembled by the same company have small errors among themselves, which cause changes in the length of the delay time of these transmitting devices. As a result of this, during actual use, even when service of the paging system is offered by matching different transmitting devices, there are differences in the transmission time of the final radio relay transmission by each transmitting device in the system, thereby preventing the simultaneous transmission of paging data. Therefore, in actual use, when paging data is received, the error rate increases due to differences in transmission time from transmitting devices having different delay time periods.

Summary of the invention
Therefore, the technical task of the present invention is to solve this problem by providing a circuit for delaying the synchronization reference signal (1IVS) formed by the receiving device of the GSSR, thereby controlling the time at which the paging data is sent from the transmitting device controller of the paging system node to the transmitting device so to compensate for errors caused by the delay time associated with the transmitting device, and to provide a way to synchronize the search data call (transmit (in the form of a radio relay frequency) in absolute time so as to achieve simultaneous transmission of such data.

 In one aspect of the present invention, a circuit for delaying a synchronization reference signal from a receiver of a global satellite radiodetermination system (GSSR) comprises: a data bus; a trigger connected to a data bus and responsive to a trigger input signal for receiving a signal from a data bus; a counter-controller connected to the data bus and responding to the reference synchronization signal received from the receiver of the GSSR (1IVS) to count a series of pulses of the reference synchronization signal of the counter and generate a counter output signal in response to it, so the counter-controller starts counting pulses reference counter synchronization signal in response to the signal 1IVS; and a comparator connected to the trigger and the counter-controller, designed to receive a data bus signal from the trigger and to generate a delayed signal (1IVS) in response to the data bus signal received from the trigger and the counter output from the counter-controller.

 In accordance with another aspect of the present invention, a method for simultaneously transmitting paging data in a paging system having a plurality of transmitter controllers for receiving paging data, and a transmitter associated with each of the transmitter controllers for modulating and transmitting paging data received from the corresponding controller of the transmitting device, comprises the steps of: introducing a reference synchronization signal from a global satellite receiver Stem radiodetermination (GSSR) into a plurality of controllers, transmitters paging system; delays of 1 - X seconds, the synchronization reference signal from the receiver of the global satellite radiodetermination system (GSSR), which arrives at each of the transmitting device controllers, where the value of X is the delay time associated with the transmitting device associated with each of the transmitting device controllers ; sending paging data from a plurality of transmitting device controllers to each of the associated transmitting devices in accordance with a delayed synchronization signal; and simultaneously transmitting paging data from a plurality of transmitting devices, wherein simultaneously transmitting paging data is a synchronized reference synchronization signal from a receiving device of the GSSR.

In accordance with yet another aspect of the present invention, a paging system for simultaneously transmitting paging data comprises
means for receiving a synchronization reference signal from a receiver of a global satellite radiodetermination system (GSSR) using a plurality of transmitting device controllers,
means operatively connected to each of said plurality of transmitting device controllers for delaying by 1 - X seconds of said synchronization reference signal,
means for sending said paging data from said plurality of transmitting device controllers to a plurality of transmitting devices, each of which corresponds to one of said plurality of transmitting device controllers, in accordance with said delayed reference synchronization signal, said value X representing the delay time of each of the transmitting devices ,
means for simultaneously transmitting said paging data from said plurality of transmitting devices, wherein said simultaneous transfer of paging data is synchronized by said synchronization reference signal from said receiving device of the GSSR.

 These and other objectives, features and advantages of the present invention will become apparent from the following detailed description of illustrative embodiments thereof, which should be read in connection with the accompanying drawings.

Brief Description of the Drawings
FIG. 1 (a) to (d) illustrate conventional timing diagrams of transmitting paging data from a controller of a transmitting device to a transmitting device and transmitting modulated paging data from a transmitting device as reference for a signal 1IVS from the GSSR.

 FIG. 2 illustrates a block diagram for delaying a reference clock signal 1IVC to provide a delayed signal (1IVC ') in accordance with the present invention.

 FIG. 3 (a) and (b) illustrate timing charts showing the relationship between the synchronization reference signal (1IVC) from the GSSR and the corresponding delayed signal 1IVC 'according to the present invention.

 FIG. 4 (a) to (d) illustrate timing diagrams for a method according to the present invention for sending paging data from a controller of a transmitting device and transmitting modulated paging data from a transmitting device as reference signals for a synchronization reference signal 1IVC and a delayed signal 1IVC '.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Consider FIG. 2, which is a block diagram illustrating a block diagram according to the present invention for delaying a reference clock signal 1IVC to provide a delayed signal (1IVC '). In FIG. 2, a data bus for entering data into the trigger (indicated by D1) is provided for introducing the desired time delay into the trigger (100) and the counter-controller (200). When the trigger input signal is supplied, the trigger (100) sets the input time delay value in the comparator (300) via the data bus (D2) to input data from the trigger into the comparator.

 Now, an example will describe the operation of the circuit. Assume that the delay time X of the transmitter is 10 ms. Then the circuit is configured to delay the 1IVS signal for 1 s - 10 ms = 990 ms in order to generate a delayed 1IVS signal ("1IVS '"). In order to obtain this delay time, the reference synchronization (120) of the counter must be set at a frequency of 100 Hz so as to receive synchronizing pulses every 10 ms (i.e., a period of 10 ms). These pulses are entered into the counter-controller (200) and counted. The said counter-controller starts counting said pulses of said reference synchronization signal of the counter in response to said signal 1BC. If these clock pulses are counted 99 times, the signal 1IVS can be delayed by 990 ms. Since in the above example the delay should be 990 ms in steps of 10 ms, the delay value 99 (hexadecimal value 63) is supplied to the data bus D1. It is understood that if a step of less than 10 ms is required, reference synchronization of a higher frequency can be used and the unit of measurement of the counter can be increased.

 As soon as the delay value is set in the comparator 300, the counter-controller (200) starts counting 10 ms reference clock pulses when it receives the first signal 1IVS from the GSSR. The counter-controller (200) continuously provides the counter readings, which are supplied to the comparator (300) via the counter output line (indicated by C1). In the comparator (300), the desired time delay (which is received from the trigger (100)) and the counter value (which comes from the controller counter (200)) are continuously compared. If it is determined that these two values are different, the counter-controller (200) continues to count and delay the initial 1IVC signal with 10 ms increments. When the output value of the counter signal (which is counted continuously with 1) coincides with the delay value set in the comparator (300) (which is 99 in the above example), the comparator (300) generates a signal 1ІВС ', which is delayed by 990 ms (99 times 10 ms-steps) compared with the signal 1IVS. Then the signal 1IVS 'enters the counter-controller (200) to set the counter to its original position. This process is repeated for each pulse of the signal 1ВТС ', which enters the counter-controller (200) to create a signal delayed by 990 ms signal 1IVС'.

 As demonstrated above, the conventional method of sending paging data from the controller of the transmitting device to the transmitting device is based on absolute time information (i.e., 1IVC signal) and does not take into account the delay time of the transmitting device. Now with reference to FIG. 3 and 4, a method of compensating a transmission delay time of a transmitting device by optionally controlling the timing of a paging data transmission will be described according to the present invention. In accordance with the present invention, the reference time for sending paging data from the controller of the transmitting device to the transmitting device is determined using signal 1 of IVS ', which is generated by delaying signal 1 of IVS from GSSR. If signal 1IVS 'is represented in the form of a time equal to an absolute time pulse of 1 s in signal 1IVC, this is equivalent to generating a signal 1IVC at time point X in advance, where X is the delay time of the transmitting device. In particular, the timing diagram of FIG. Figure 3 illustrates the 1IRC 'signal generated by delaying the 1IVC signal (as described above) by 1-X = 990 ms (where X was assumed to be 10 ms). As shown in FIG. 3 (a) and (b), when the IVS signal 1 is delayed by a time of 1 - X, the signal 1IVC 'is essentially a signal that is advanced forward by time X relative to the signal 1IVC, when evaluated in absolute time. As was stated above, the signal 1ІВС '(as opposed to the signal 1ІВС) is a reference signal by means of which the controller of the transmitting device sends paging data to the transmitting device. It is noted here that said IVS signal 1 serves as a synchronization reference signal used by the controller of the transmitting device to send call data to the transmitting device. By itself, the advanced time X compensates for the delay time X of the transmitting device. Therefore, due to the application of this method, the final moment of transmission from the transmitting device will be synchronized in absolute time, despite the delay time of the transmitting device.

 For example, as shown in FIG. 3, after the delay of the 1IVS signal (at the time of absolute time 00 seconds) by any value, the delayed signal (i.e. 1IVS ') is applied at the next moment of the absolute time 01 second. Essentially, when coordinated with the transmitting device with a delay time X and after a delay, the 1IVS signal (at 00 seconds) to 1-X, this delayed 1IVS 'signal is applied and the absolute time is 01 second.

 With reference to FIG. 4 is a timing diagram for a method of sending paging data from a controller of a transmitting device and transmitting modulated paging data from a transmitting device in accordance with the present invention, based on a synchronization reference signal 1IVC and a delayed signal 1IVC '. As shown above and further illustrated in FIG. 4 (a) and (b), the signal 1IVC 'is essentially a signal advanced forward by time X in absolute time. Timing diagrams in FIG. 4 (b) and 4 (c) show that the transmission of data from the controller of the transmitting device to the transmitting device in accordance with the present invention is synchronized by signal 1IVS '. Further, the timing diagrams in FIG. 4 (a) and 4 (d) show that the transmission of data (modulated by radio-frequency frequency) from the transmitting device in accordance with the present invention is synchronized by signal 1BC. As a result, the controller of the transmitting device sends the data paging call to the transmitting device in accordance with the signal 1 IVS '. Then the paging data is transmitted from the transmitting device, essentially, at a delayed point in time X, which is synchronized in absolute time n seconds (i.e., signal 1IVS).

 There are several advantages to using the method of the present invention described above in a paging system. Firstly, since the moment of transmitting the paging data from the controller of the transmitting device to the transmitting device can be advanced forward (in terms of absolute time), the moment of transfer can be compensated, regardless of the delay time of the transmitting device. In particular, the transmitter controller sends paging data to the transmitter at an advanced point in time X (i.e., the delay time of the transmitter), so that the transmission time of the microwave signal from the transmitter is synchronized in absolute time (i.e., 1IMC signal ) Therefore, regardless of the delay time of the transmitting device, all base nodes can simultaneously transmit search data call (through their respective transmitting devices).

 Moreover, even if different transmitters having different delay times associated with them are matched and used in the paging system, the controller of the transmitting device sends paging data at a time that is adjusted in advance according to each delay time of the transmitting device, most offering the user a flexible system. This contributes to ease of manufacture and improvement since the transmitter manufacturer does not need to optionally fix the delay time for each transmitter.

 The simultaneous transmission method described above also minimizes the error rate of paging data reception that may appear in areas of cell overlap. In addition, it is possible to develop an effective system, since in each node this concept of simultaneous data transmission to all systems can be applied.

 Although illustrative embodiments of the present invention have been disclosed herein with reference to the accompanying drawings, it should be understood that the invention is not limited to these embodiments only and that those skilled in the art can make various other changes and modifications here without departing from the gist and scope of claims of the invention. All such changes and modifications are intended to be included in the scope of the claims of the invention defined by the attached claims.

Claims (7)

 1. Scheme for delaying the reference synchronization signal from the receiver of the global satellite radiodetermination system (GSSR) in the paging system, characterized in that it contains a first data bus designed to introduce the desired time delay, a trigger connected to the first data bus and responding to the input a signal for receiving a signal from the first data bus, a counter-controller connected to the first data bus and responsive to the synchronization reference signal received from the receiver GSSR device, designed to count a series of synchronizing pulses of the reference synchronization and generate an output signal in response to it, so the counter-controller starts counting a series of synchronizing pulses of the reference synchronization in response to the synchronization reference signal received from the receiver of the GSSR, and a comparator connected to trigger and counter-controller, designed to receive from the output of the trigger the signal of the second data bus, designed to establish the value of the input time aderzhki, and for generating a delayed reference clock signal in response to the second data bus signal received from the output of the flip-flop, and the output controller counter.  2. The circuit according to claim 1, characterized in that the comparator provides a delayed reference synchronization signal when the output signal of the counter-controller is equal to the signal of the second data bus.  3. The circuit according to claim 1, characterized in that the counter-controller is set to its initial state when the delayed reference synchronization signal comes from the output of the comparator.  4. The circuit according to claim 1, characterized in that the signal of the first data bus corresponds to the delay time of the transmitting device in the paging system.  5. The circuit according to claim 1, characterized in that the delayed reference synchronization signal serves as a synchronization reference for the controller of the transmitting device with respect to sending paging data to the transmitting device associated with the controller of the transmitting device in the paging system.  6. The circuit according to claim 5, characterized in that the paging data is transmitted from the transmitting device, and the transmission of the paging data is synchronized by the reference synchronization signal.  7. A method for simultaneously transmitting paging data in a paging system having a transmitter of a paging device for receiving paging data and a plurality of transmitting devices associated with a controller of a paging device, comprising: receiving, from the receiving device, a reference clock signal 1 of the TDF devices of the global satellite radiodetermination system (GSSR), characterized in that they delay by a value of 1 - X seconds the reference synchronization signal 1 of the TDF p by the controller of the transmitting device, wherein the value X is the delay time between each of the specified set of transmitting devices and the controller of the transmitting device, send paging data from the controller of the transmitting device to the specified each of the set of transmitting devices in accordance with the delayed reference synchronization signal 1 IVS ', which delayed in accordance with X of each of the plurality of transmitting devices, and transmitting paging data from each of the specified a set of transmitting devices that transmits said paging data after receiving said paging data.

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