Synchronizing method of mobile communication satellite

[Detailed Description of the Invention]

In the mobile communication system with which the present invention sends out the same send data signal by the same phase to a moving terminal from a central base station and a plurality of circumference base stations, It is related with the art which amends the phase of the send data signal sent out from a central base station and each circumference base station on the basis of the digital signal sent out from the clock of the communications system, and the satellite which has [ un-synchronizing and ] a lock. Although the send data signal is transmitted by the ground connecting line between 1 central base station and each circumference base station in a mobile communication system, the phase of a send data signal may shift by course change of - ground connecting line, etc. Although there is a method which performs phase amendment on the basis of the signal for phase amendment transmitted by radio from a central base station as one of the publicly known methods for performing this phase amendment, In the circumference base station in the geographical feature which cannot be foreseen from a central base station, there was a fault which cannot perform phase amendment without the ability to receive the electric wave from a central base station. When a service area was expanded, there was a fault which cannot perform phase amendment of the long-distance circumference base station at which the electric wave of a central base station cannot arrive. Although the clock from which a mobile communication system is extracted from the digital signal from a satellite as other publicly known methods is made to carry out a subordinate synchronization and there is a method which amends the phase of the send data from a central base station in each circumference base station on the basis of the frame synchronization signal of the digital signal from a satellite, The complicated circuit which receives the digital signal from a satellite in a central base station, extracts a clock from the received signal, and carries out speed change to the clock of a mobile communication system is required for this method, And since the clock of a mobile communication system was dependent on the clock of the digital signal from a satellite, there was a fault that the reliability of a mobile communication system was governed by the reliability of a satellite. The present invention is made to perform phase amendment of the send data signal of the mobile communications 1 system on the basis of the frame synchronization signal of the digital signal, without subordinating the clock of a mobile communication system to the digital signal from a satellite, in order to solve these faults. Hereinafter, Drawing 1 of an opinion shows one example of the present invention with a drawing about the example of the present invention. In the figure, central base station 1 and circumference base station 2 received the telemetry signal discharged from satellite 5 using receiving antenna 3 and receiver 4, and have sent out the digital signal to which it restored to central base station phase amendment circuit 6 or circumference base station phase amendment circuit 7. While Sign corner-ized device 8 generates a send data signal and sends it out to central base station phase amendment circuit 6 and circumference base station phase amendment circuit 7 via ground connecting line 9, it is always supervising the phase of a chip box Si Be returned send data signal via ground connecting line 9 from each circumference base station, Detection of a phase gap will give a phase amendment demand to central base station phase amendment circuit 6. If a phase amendment demand is received, central base station phase amendment circuit 6 creates a reset pulse on the basis of the frame synchronization signal of a satellite telemetry signal, and sends it out to circumference base station phase amendment circuit 7. In a central base station and a circumference base station, phase amendment is performed based on the above-mentioned reset pulse in a Gentlemen phase amendment circuit, and a send data signal is sent out to transmitter 1o, and is discharged from a transmitting antenna. Drawing 2 is a figure for explaining the principle of phase amendment of the present invention. In Drawing 2, 11 sets the cycle to Po by the received IJ time many satellite Telemet [ as ] signal frame synchronization signal. 12 sets the cycle to Pl with the timing signal of send data. If considering the case where frame synchronization signal 11 of a satellite telemetry signal and timing signal 1z of send data synchronize both signals are coincided at a certain time To, both signals are in agreement again at time Tl after time [ to be equivalent to Dan S of each cycle of both signals ] progress. Time Tl is obtained by Male reset at time To by [ equivalent to cycle pI of timing signal 12 of send data ] carrying out a number-of-times count in the pulse of IJ time many Satellite TV [ as ] signal frame synchronization signal 11. Since timing 12 of send data is movable by adjustment of the read-out time from a memory, it is a reset signal from a central base station at time'ro, If the frame synchronization signal counter of the satellite telemetry signal of a circumference base station is reset, it is possible to detect a gap of the send data timing to time T1, and to amend a phase in the circumference base station. When frame synchronization signal 11 of a satellite telemetry signal and timing signal 12 of send data are asynchronous, both signals may shift somewhat at time 1, but phase amendment can be performed by adjusting compulsorily the timing signal of the send data of all the offices. Drawing 3 shows the phase amendment circuit of the central base station of one example of the present invention. According to the distance of a central base station and a circumference base station, send data signal C sent out from coding equipment 7 of Drawing 1 in Drawing 3 was beforehand defined by fixed delay circuit 13, and time delay is carried out. Transmitting data frame synchronous detector circuit 14 detects the delayed frame synchronization of send data signal d, and outputs transmitting data frame Synchronous signaling. Read-out timing signal generating circuit 15 outputs read-out timing signal To in sync with transmitting data frame Synchronous signaling. This Signal is equivalent to timing signal 12 of the send data under explanation of Drawing 2 mentioned above. Write-in timing signal generating circuit 16 outputs write-in timing signal f which similarly synchronizes with transmitting data frame synchronized signal 6, and has the same cycle as read-out timing signal To. It is for memory circuit 17 performing variable delay, and send data signal d is written in by write-in timing signal f, and is read by read-out timing signal To. Signal t outputted from memory circuit 17 is sent out to transmitter 10 of Drawing 1. On the other hand, Signaling to which it restored with Beautiful teleme IJ signal receiver 4 of Drawing 1 is sent out to satellite telemetry frame synchronization detector circuit 18, and satellite telemetry frame synchronization signal a is outputted by this circuit. This signal alpha is equivalent to IJ time many satellite Telemet [ as ] signal frame synchronization signal 11 under explanation of Drawing 2 mentioned above. Phase amendment demand Signaling to which reset pulse generating [119 is sent out from coding equipment 7 Back star telemetry frame synchronization signal alpha reset by 0 satellite telemetry deflection 1 Beam synchronized signal counter 20 Over reset pulse J which outputs reset pulse I to the timing which reads with satellite telemetry frame synchronization signal alpha, and whose timing signal To corresponds is counted, The standard timing signal system for phase amendment is outputted. The timing by which this signal A is generated is equivalent to time T1 under explanation of Drawing 2 mentioned above. If it reads on the basis of signal A and the timing of timing signal A potato is changed, send data signal t of an office besides all the X will be adjusted to the same phase. Drawing 4 shows the phase amendment circuit of the circumference base station of one example of the present invention. This circuit is completely the same as the circuit except reset pulse generating circuit 15 in the central base station phase amendment circuit shown in Drawing 3, receives reset pulse J from a central base station, and performs phase amendment in the same operation as a central base station phase amendment circuit. Cycle Pl of 32 milliseconds and a read-out timing signal of cycle Po of the IJ time many satellite Telemet [ as ] signal frame synchronization signal in one example of the present invention is 155 milliseconds. The data-communications time between a central base station and a circumference base station is P. Since it is small enough compared with (32 Mi lJ second), the malfunction by the delay of a reset signal does not arise. It is although the reset pulse is generated in this example to the timing which reads with 1 satellite telemetry frame synchronization signal a and whose timing signal Into corresponds when there is a phase amendment demand from coding equipment 7, It reads with satellite telemetry frame synchronization signal a, and detects phase relation with timing signal Boss, If the method of controlling the relative phase relation of read-out timing signal Ri to satellite Telemet IJ frame synchronization signal 4 is taken, it will be the timing of the arbitrary pulses of the above-mentioned satellite Telemet IJ frame synchronization signal, and it is possible to generate a reset signal. Since phase amendment of send data is performed in a mobile communication system on the basis of the clock of this Mobile communication system segregated meeting != cow-meeting Custodian !=, and the digital signal of an asynchronous satellite according to the method of the present invention as explained above, Without the reliability of a mobile communication system being extensively governed by the reliability of a satellite, without receiving Influence of the distance between a central base station and a circumference base station, or geographical feature, the send data of the same phase can be sent out and an effect is large. On the other hand, the present invention has an advantage easily realizable in the comparatively easy circuit of about 30 Digital E C abbreviation.

[Brief Description of the Drawings]

A figure for the figure and Drawing 2 in which Drawing 1 shows one example of the present invention to illustrate the principle of phase amendment of the present invention, the figure in which Drawing 3 shows the phase amendment circuit of the central base station of one example of the present invention, and Drawing 4 are figures showing the phase amendment circuit of the circumference base station of one example of the present invention. 1 ... central base station, 2 ... circumference base station, 3 ... receiving antenna, 4 ... receiver, 5 ... satellite, 6 ... central base station phase amendment circuit, 7 ... circumference base station phase amendment circuit, 8 ... coding equipment, 9 ... ground connecting line, 10 ... Transmitting 4L l 1 ... Frame synchronization signal of a satellite telemetry signal, 12 ... timing signal of send data, 13 ... fixed delay circuit, 14 ... transmitting data frame synchronous detector circuit, 15 ... read-out timing generator circuit, 16 ... write-in timing generator circuit, 17 ... memory circuit, 18 ... satellite telemetry frame synchronization detector circuit, 19 ... reset pulse generating circuit, 20 ... frame synchronized signal counter, Po ... [ ... The frame synchronization signal of a satellite telemetry signal and the timing signal of send data are coincidence Si Time and T1 / ... Time T ] The cycle of an IJ time many satellite Telemet [ as ] signal frame synchronization signal, Pl ... The cycle of the timing signal of send data, To The time after Or time S progress, S ... Time to be equivalent to the product of cycle Po of an IJ time many satellite Telemet [ as ] signal frame synchronization signal, and the cycle of the timing signal of send data, 4 ... A satellite telemetry frame synchronization signal, k ... Read-out timing signal, c, dSg [ ... Satellite telemetry Belief, Le / ... Standard timing signal representative / Patent attorney Drawing 1 of Takashi Homma ] ... A send data signal, L ... A transmitting data frame synchronized signal, f ... A write-in timing signal, I Drawing 2 Drawing 3