Repeating installation using telephone line

• US 6,738,597 B1
• Filed: 07/16/2001
• Issued: 05/18/2004
• Est. Priority Date: 06/24/1998
• Status: Expired due to Fees

• Current Assignee: SK Telecom Co., Ltd.
• Original Assignee: SK Telecom Co., Ltd.
• Inventors: Yook, Jun-Soo, Jeung, Ha-Jae
• Primary Examiner(s): Vuong, Quochien B.
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US09/720,631
• Time in Patent Office: 1,037 Days
• Field of Search: 455/11.1, 455/3.01, 455/209, 455/14, 455/15, 455/16
• US Class Current: 455/11.1
• CPC Class Codes: H04B 7/15535 Control of relay amplifier gain amplifier gain control in general H03G3/00; gain control reducing self - or loop interference H04B7/15578
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

A repeating apparatus of the present invention converts a data signal from the mobile switching center to an intermediate frequency signal and transfers the intermediate frequency signal to an unused telephone line and a dedicated line network. The apparatus converts the intermediate frequency signal transferred through the unused telephone line and the dedicated line network to the data signal frequency signal and transfers the data signal to the mobile switching center. In the present invention, the intermediate frequency signal is transferred between a mother station and at least one first child station through the unused telephone line and the intermediate frequency signal is modulated to transfer between the mother station and at least one second child station through the dedicated line network.

Claims

1. A repeating apparatus comprising:

a mother station within a base station; and

at least one first and second child stations,

wherein the mother station mixes a data signal from a mobile switching center to generate an intermediate frequency signal to transfer to a unused telephone line and converts the intermediate frequency signal transferred through the telephone line to a baseband signal to transfer to the mobile switching center, depending on a synchronization signal generated by a synchronization signal generating means in the base station, and

the intermediate frequency signal is transferred between the mother station and the at least one first child station through the unused telephone line,

wherein the mother station mixes the data signal from the mobile switching center to generate the immediate frequency signal to transfer through a dedicated line network and converts the intermediate frequency signal transferred through the dedicated line network to the baseband signal to transfer to the mobile switching center, depending on the synchronization signal generated by the synchronization signal generating means in the base station, and

the intermediate frequency signal is modulated to transfer between the mother station and the at least one second child station through the dedicated line network,

wherein the mother station includes;

a controlling means for composting the data signal from the mobile switching center with a code division multiple access technique to generate the intermediate frequency signal to transfer through the dedicated line network, converting the intermediate frequency signal transferred through the dedicated line network to the baseband signal and demodulating the baseband signal with the code division multiple access technique for each channel to transfer to the mobile switching center;

a frequency converting means for converting the frequency of the intermediate frequency signal to a lower frequency;

a signal transferring means for transferring the intermediate frequency signal converted by the frequency converting means to the controlling means; and

a signal distributing means for distributing the intermediate frequency signal transferred via the signal transferring means to transfer through the unused telephone line and the dedicated line network and distributing the intermediate frequency signal received through the phone line and the dedicated line network to transfer to the signal transferring means,

wherein a signal generated at the base station is transferred by using low frequency bandwidth of the telephone line and signal generated to the first and the second child stations are transferred by using high frequency bandwidth of the telephone line.

2. The apparatus as recited in claim 1, wherein the mother station further includes:

a signal connecting means for connecting operation state monitoring signals corresponding to the at least one first and second child stations distributed by the signal distributing means to the controlling means,

wherein the mother station detects operation failure of the at least one first and second child stations by using the operation state monitoring signals from the signal connecting means.

3. The apparatus as recited in claim 2, wherein the operation state monitoring signals for the at least one first and second child stations are audio frequency signals that are not transferred via the signal transferring means but transferred via the signal connecting means.

4. The apparatus as recited in claim 1, 2 or 3, further comprising:

a signal coupling means connected to the telephone line and the dedicated line network for coupling signals between the mother station and the at least one first and second child stations;

at least one first PCM (Pulse Coded Modulation) converting means for converting a PCM signal transferred from the signal coupling means to the intermediate frequency signal and the operation state monitoring signals to transfer to the mother station and converting the intermediate frequency signal transferred from the mother station to the PCM signal to transfer to the signal coupling means; and

at least one second PCM converting means for converting the intermediate frequency signal and the operation state monitoring signal transferred from the at least one second child station to the PCM signal to transfer to the signal coupling means and for converting the PCM signal transferred from the signal coupling means to the intermediate frequency signals to transfer through the unused telephone line to the at least one second child station.

5. The apparatus as recited in claim 4, wherein the at least one first child station is disposed at a shadow area of inside of a building in which the mother station is located, and the at least one second child stations is disposed at a shadow area of outside of the building connected to the dedicated line network.

6. The apparatus as recited in claim 1, wherein each of the at least one first and second child stations includes:

a first gain controlling means for detecting gain loss of the intermediate frequency signal transferred from the mother station to generate a first gain control signal for compensating the gain loss of the intermediate frequency signal;

a up-converting means for up-converting the intermediate frequency signal transferred from the mother station to a high frequency signal and compensating, depending on the first gain control signal, the gain of the high frequency signal up-converted to transfer to outside;

a second gain controlling means for estimating gain loss induced to a received signal from the outside during transmission to the mother station through the unused telephone line and the dedicated line network by using the first gain control signal transferred from the first gain controlling means to generate a second gain control signal for compensating the gain loss of the received signal; and

a down-converting means for down-converting the high frequency signal transferred from the outside to the intermediate frequency signal and compensating, depending on the first gain control signal, the gain of the intermediate frequency signal down-converted to transfer to the mother station.

7. The apparatus as recited in claim 6, further comprising:

a first duplexer for transferring the high frequency signal transferred from the up-converting means to the outside and transferring the high frequency signal transferred from the outside to the up-converting means; and

a second duplexer for transferring the intermediate frequency signal transferred through the telephone line and the dedicated line network to the down-converting means and transferring the intermediate frequency signal transferred from the down-converting means to the telephone line and the dedicated line network.

8. The apparatus as recited in one of claims 6 and 7, further comprising:

an operating state monitoring means for monitoring operation states of the first gain controlling means, the up-converting means, the second gain controlling means and the down-converting means; and

a first filtering means for filtering the monitoring signal of the audio frequency bandwidth transferred from the operation state monitoring means and transferring the filtered signal to the telephone line and the dedicated line network.

9. The apparatus as recited in claim 8, wherein the first gain controlling means includes:

a gain detector for detecting the gain loss of the intermediated frequency signal transferred through the telephone line and the dedicated line network; and

a gain controller receiving the detected gain loss from the gain detector for providing the up-converting means and the first gain controlling means with the first gain controlling signal to compensate the gain loss of the intermediate frequency signal.

10. The apparatus as recited in claim 9, wherein the up-converting means includes:

a up-converter for up-converting the intermediate frequency signal transferred from the telephone line and the dedicated line network to the high frequency signal;

a second filtering means for filtering the high frequency signal up-converted by the up-converter to extract a signal of a first predetermined bandwidth to be transferred;

a first gain compensating means for compensating, depending on the first gain control signal transferred from the gain controlling means, the gain of the signal extracted by the second filtering means; and

a first amplifying means for amplifying the gain compensated high frequency signal from the first gain compensating means and transfer the amplified high signal to the first duplexer.

11. The apparatus as recited in claim 10, wherein the down-converting means includes:

a down-converter for down-converting the high frequency signal transferred via the first duplexer to the intermediate frequency signal;

a third filtering means for filtering the intermediate frequency signal down-converted by the down-converter to extract a signal of a second predetermined bandwidth to be transferred;

a second gain compensating means for compensating, depending on the second gain control signal transferred from the second gain controlling means, the gain of the signal extracted by the third filtering means; and

a second amplifying means for amplifying the gain compensated intermediate frequency signal from the second gain compensating means and transfer the amplified intermediate signal to the second duplexer.