KR20050060289A - Repeater for mobile telecommunication - Google Patents

Abstract

The present invention relates to a mobile communication repeater having a relay function and a pilot beacon function. The present invention relates to a reception antenna (10) for receiving a talk frequency from a base station and a desired frequency band among the received talk frequencies. The receiving duplexer 20, the low noise amplifier 30 which suppresses and amplifies the noise of the signal input from the receiving duplexer 20 to the maximum, and the talk frequency signal output from the low noise amplifier 30 A UP / DOWN converter 40 for converting the signal, a power amplifier 50 for amplifying the signal output from the UP / DOWN converter 40, and a frequency band for the signal from the power amplifier 50 again. In the mobile communication repeater composed of a duplexer 60 for outputting through the bay and a transmission antenna 70 for transmitting the output from the duplexer 60, the UP / DO The apparatus further includes a pseudo frequency converter 40a for receiving a specific talk frequency from the signal output from the WN converter 40 and converting the signal to a pseudo frequency which is not serviced by the base station. The power amplifier 50 includes an UP / DOWN converter 40. And amplifying the signal output from the pseudo frequency output from the pseudo frequency converter 40a to a predetermined output.

Description

Repeater for mobile telecommunications

The present invention relates to a mobile communication repeater mounted on a mobile means having a relay function and a pilot beacon function. More particularly, the present invention relates to a pseudo frequency of a FA (Frequency Assignment) input through a receiving antenna. The present invention relates to a repeater for a mobile communication that can prevent a call from being disconnected when passing through a jurisdiction between base stations having different numbers of talk frequencies without having to install a separate switched pilot beacon (SPB) next to the base station.

In general, during a two-way call, a cellular phone or personal communication (PCS) for dividing a data transmission service area into a plurality of cells and installing a base station in each of them for data transmission. A mobile communication service such as a service may continue without disconnection in a cell of the other base station when the mobile station (MS) leaves the cell of one base station (BTS) serving and enters the cell of the other base station. Hand-over (or hand-off) must be performed.

In the conventional case, a separate switched pilot beacon (SPB) was installed next to the base station to perform the handover.

An object of the present invention is to convert the frequency of any one frequency (FA) input through the receiving antenna to a pseudo frequency to the base station between each base station having a different number of talk frequencies without installing a separate switched pilot beacon (SPB) next to the base station It is to provide a repeater for mobile communication that can prevent the call is disconnected when passing through the jurisdiction.

Preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the drawings.

1, a mobile communication repeater 1 according to the present invention includes a reception antenna 10 for receiving a talk frequency from a base station, and a reception duplexer 20 for outputting only a desired frequency band among the received talk frequencies. And a low noise amplifier 30 for suppressing and amplifying the noise of the signal input from the reception duplexer 20 to the maximum, and UP / converting the talk frequency signal output from the low noise amplifier 30 back to a talk frequency signal. DOWN converter 40, a power amplifier 50 for amplifying the signal output from the UP / DOWN converter 40, and a duplexer for passing the signal from the power amplifier 50 back through only a desired frequency band and outputting it. 60, and a transmission antenna 70 for transmitting the output from the duplexer 60.

In addition, the mobile communication repeater 1 according to the present invention further includes a pseudo frequency converter 40a for receiving a specific call frequency among the signals output from the UP / DOWN converter 40 and converting it to a pseudo frequency which is not serviced by a base station. The power amplifier 50 synthesizes a signal output from the UP / DOWN converter 40 and a pseudo frequency output from the pseudo frequency converter 40a and amplifies the signal to a predetermined output.

Referring to FIG. 2, the pseudo frequency converter 40a is a telephone frequency input from the first local oscillator 41, the talk frequency converter, and the first local oscillator 41, which generate and output a first local signal, respectively. And a first mixer 42 for generating and outputting an intermediate frequency by mixing the first local signal, and an IF filter 43 for outputting only the desired frequency band of the intermediate frequency input from the first mixer 42, and outputting the intermediate frequency. A pseudo frequency is generated by mixing the intermediate frequency and the second local signal respectively input from the second local oscillator 44, the IF filter 43, and the second local oscillator 44, which generate and output two local signals. The second mixer 45 is composed of.

For example, the first mixer 42 has a first frequency having a magnitude of 871.11 MHz input from the pseudo frequency converter 40a and a size of 801.11 MHz input from the first local oscillator 41. Local signals are mixed and converted into intermediate frequencies having a magnitude of 70 MHz and output to the IF filter 43. The IF filter 43 passes only the desired frequency band of the intermediate frequency having an input size of 70 MHz and outputs it to the second mixer 45. The second mixer 45 mixes an intermediate frequency having a magnitude of 70 MHz input from the IF filter 43 with a second local signal having a magnitude of 806.03 MHz input from the second local oscillator 44, thereby providing 876.03 MHz. A pseudo frequency 2FA having a magnitude is generated and output to the power amplifier 50.

As shown in Fig. 3, the repeater 1 of the present invention is located in the jurisdiction boundary 80 between the base stations 90 and 95 so that the vehicle 80 including the mobile station MS has a different number of talk frequencies. In the course of passing through jurisdiction 85 between A 90 and base station B 95, if the mobile station MS is talking on a call frequency 3FA that is not present in adjacent base station B 95, the mobile station (MS) measures the signal strength of the pilot channel or the talk frequency of the target base station A (90), and if the measured signal strength is greater than a preset threshold, the same frequency as the talk frequency of the adjacent base station B (95) Transmit FA change request signal to request to change to pseudo frequency with. When the FA change request signal is received by the target base station A 90, the target base station A 90 transmits the FA change request signal to the mobile communication repeater 1 of the present invention. Subsequently, the mobile communication repeater 1 of the present invention generates and outputs a pseudo frequency in the pseudo frequency converter 40a as described above so that the call of the mobile station can be continuously made without disconnection.

As described above, the mobile communication repeater according to the present invention has a relay function and a pilot beacon function, so that the jurisdiction boundary between each base station having a different number of talk frequencies without installing a separate switched pilot beacon (SPB) next to the base station. By avoiding disconnection of the call as it passes through, the cost of installing a switched pilot beacon (SPB) can be reduced.

1 is a block diagram showing a repeater for mobile communication according to the present invention;

FIG. 2 is a circuit diagram illustrating the pseudo frequency converter of FIG. 1.

3 illustrates a process in which a vehicle moves jurisdiction between base stations having different numbers of talk frequencies.

<Code Description of Main Parts of Drawing>

10: receiving antenna 20: receiving duplexer

30: low noise amplifier 40: UP / DOWN converter

40a: pseudo frequency converter 41: first local oscillator

42: first mixer 43: IF filter

44: second local oscillator 45: second mixer

50: power amplifier 60: transmission antenna

70: transmit duplexer

Claims (2)

A reception antenna 10 for receiving a communication frequency from a base station, a reception duplexer 20 for outputting only a desired frequency band among the received communication frequencies, and a noise of a signal input from the reception duplexer 20 to the maximum A low noise amplifier 30 for suppressing and amplifying, an UP / DOWN converter 40 for converting the talk frequency signal output from the low noise amplifier 30 back to a talk frequency signal, and the UP / DOWN converter 40 A power amplifier 50 for amplifying the output signal, a duplexer 60 for passing the signal from the power amplifier 50 again through a desired frequency band, and transmitting an output from the duplexer 60 In the mobile communication repeater composed of a transmission antenna (70), The apparatus further includes a pseudo frequency converter 40a for receiving a specific call frequency among the signals output from the UP / DOWN converter 40 and converting the signal to a pseudo frequency which is not serviced by a base station. The power amplifier 50 further includes an UP / DOWN converter. And a pseudo frequency outputted from the pseudo frequency converter (40a) and amplified to a predetermined output. The method of claim 1, The pseudo frequency converter 40a is configured to generate a first local signal and output a first local oscillator 41, the talk frequency converter and the first local oscillator 41 respectively. The first mixer 42 to generate and output the intermediate frequency by mixing the first filter 42, the IF filter 43 to pass through the desired frequency band of the intermediate frequency input from the first mixer 42, and generates the second local signal A second mixer for generating a pseudo frequency by mixing an intermediate frequency and a second local signal input from the second local oscillator 44, the IF filter 43, and the second local oscillator 44, respectively; A repeater for mobile communication, characterized in that consisting of 45).