AU751627B2 - Mobile communication system and method for solving blanket area - Google Patents
Mobile communication system and method for solving blanket area Download PDFInfo
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- AU751627B2 AU751627B2 AU17542/00A AU1754200A AU751627B2 AU 751627 B2 AU751627 B2 AU 751627B2 AU 17542/00 A AU17542/00 A AU 17542/00A AU 1754200 A AU1754200 A AU 1754200A AU 751627 B2 AU751627 B2 AU 751627B2
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Description
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name of Applicant: Actual Inventors: Address for Service: MTI CO., LTD.
TTTTT TTC'nD7\T T7 TnrTv T rmTm" Sang Gun LEE Byung Shik KANG CULLEN CO., Patent Trade Mark Attorneys, 239 George Street, Brisbane, Qld. 4000, Australia.
Invention Title: MOBILE COMMUNICATION SYSTEM AND METHOD FOR SOLVING BLANKET AREA The following statement is a full description of this invention, including the best method of performing it known to us: MOBILE COMMUNICATION SYSTEM AND METHOD FOR SOLVING BLANKET AREA BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a mobile communication system and method, and more particularly, to a mobile communication system and method in which transmission and reception are carried out between the base transceiver station and repeater at an idle frequency among a commercial frequency band, solving the blanket area.
Discussion of Related Art A mobile communication system generally includes a base transceiver station, base station controller, mobile switching center and mobile stations. The base transceiver station communicates with the mobile stations in a specific frequency band, each base station having a predetermined coverage area. A plurality of base transceiver stations are appropriately arranged to allow the coverage areas of the base transceiver stations to be overlapped with each other, widening the entire coverage area.
However, even though the arrangement of the plurality of base transceiver stations covers the entire city, the blanket area where the telephone service is not available generates according to a base transceiver station which was providing service due to the effect of an obstacle like buildings and topography. The generation of blanket area does not give smooth telephone service to mobile station users located therein. To solve this problem, a base transceiver station may be set up in the blanket area. However, this consumes enormous expense for 10 setting up the base transceiver station.
Furthermore, in a conventional technique for solving the blanket area, the base transceiver station performs transmission/reception to/from mobile stations in the blanket area using a repeater employing a microwave of above 10GHz or optical repeater. However, the repeater employing the microwave is expensive and sensitive to attenuation due to raining, and requires a visibility range. With the optical repeater, it is difficult to secure the optical line.
SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a mobile communication system and method for solving blanket area that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a mobile communication system and method for solving blanket area, in which an umbrella base transceiver station and remote repeater for repeating it are set up, to solve the blanket area.
To accomplish the object of the present invention, there is provided a mobile communication system including a plurality of base transceiver station each of which has a predetermined 0 coverage area, an umbrella base transceiver station having the coverage area which covers the coverage areas of the plurality of base transceiver stations, and a remote repeater set up in blanket area which is located between the plurality of base transceiver stations, the remote repeater being for carrying out transmission/reception to/from the umbrella base transceiver station using an idle frequency band among frequency bands used by the plurality of base transceiver stations.
The remoter repeater converts the idle frequency used for transmission/reception to/from the umbrella base transceiver station into the frequencies used by the n base transceiver stations, to carry out transmission/reception to/from the mobile station in the blanket area.
To accomplish the object of the present invention, there is provided a communication method in a mobile communication system including a plurality of base transceiver stations each of which has its coverage area, the method including the steps of an umbrella base transceiver station transmitting signals at an idle frequency which is not used by the plurality of base transceiver stations among a commercial frequency band, the umbrella base transceiver station transmitting the signal with a transmission power which covers the coverage areas of the plurality of base transceiver stations, a remote repeater, set up in the blanket area located between the plurality of base transceiver stations, receiving the idle frequency, converting it into a frequency band used by the plurality of base transceiver stations, and transmitting/ receiving it to/from a mobile station in the blanket area, and the remote repeater converting the signal at the commercial frequency band, received from the mobile station, into the idle frequency band, and transmitting it to the umbrella transceiver station.
The step of transmitting signals to the mobile station by the remote repeater includes the steps of amplifying the signal received from the umbrella base transceiver station, converting the frequency band of the amplified signal into a first frequency, filtering the signal whose frequency band is converted, using a bandpass filter, splitting the filtered signal into multiple frequency bands, converting the frequencies of the split signals into at least one commercial frequency band used by the plurality of base transceiver stations, and amplifying the signals whose frequencies are converted, and transmitting them to the mobile station.
The step of transmitting signals to the umbrella base transceiver station by the remote repeater includes the steps of 10_ amplifying the signal received from the mobile station, converting the frequency band of the amplified signal, filtering the signal whose frequency band is converted, using a bandpass filter, converting the filtered signal into the idle frequency band, and amplifying the converted signal.
It is to be understood that both the foregoing general description and the following detailed description are exemplary o" and explanatory and are intended to provide further explanation oo~• of the invention as claimed.
BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention: In the drawings: Fig. 1 illustrates coverage areas of and umbrella base transceiver station and conventional base transceiver stations; Fig. 2 illustrates commercial frequency channels of a mobile communication system; and Fig. 3 illustrates the configuration of a remote repeater.
"010 DETAILED DESCRIPTION OF PREFERRED EMBODIMENT Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The following description takes personal communication service (PCS) as an example for convenience.
Fig. 1 illustrates coverage areas of base transceiver stations and umbrella base transceiver station. In Fig. i, small circles (shown as thin solid line) indicate the coverage areas of the conventional base transceiver stations and a large circle (shown as thick solid line) indicates the coverage area of umbrella base transceiver station 21. Umbrella base transceiver station 21 has the following characteristics different from those of the conventional base transceiver stations. First of all, it has the coverage area which is larger than those of the conventional multiple base transceiver stations and includes them. Furthermore, it uses a frequency, different from the frequency employed for communication between the conventional base transceiver stations and repeater, as its transmission/reception frequency.
Specifically, the commercial frequency band of PCS system of Korea is around 1.8GHz which is divided into a predetermined number of channels (for example, Fl, F2, Fn) for use. Some ooeoo channels among the divided channels are used as transmission/ reception band in the coverage area of one base transceiver station. Accordingly, a plurality of idle commercial frequency channels Ggenerate other than the channels used. The mobile communication system using the umbrella base transceiver station according to the present invention employs the idle commercial .oooeo frequency channels as its transmission/reception frequency used between the base transceiver stations and repeater.
In a conventional PCS system, its base transceiver station carries out transmission/reception to/from the repeater with a microwave of 18GHz, and each of the base transceiver station and repeater transmits signals to a mobile station at the commercial frequency of 1.8GHz. Accordingly, the signal at the commercial frequency band of 1.8GHz is required to be converted into a signal at the frequency band of 18GHz to perform communication between the base transceiver and repeater using the microwave of 18GHz. Therefore, the repeater or base transceiver station for receiving the signal at the microwave band needs a filter for filtering high frequency signals, increasing the expense for the system. On the contrary, the umbrella base transceiver station 10 according to the present invention uses the idle frequency channel (1.8GHz) that is not used among the multiple commercial oeeee frequency channels (1.8GHz) as the transmission/reception frequency, to enable filtering of signal at a frequency lower than the conventional one, decreasing the expense for the system.
Fig. 2 illustrates the commercial frequency channels at the band of 1.8GHz of the PCS system. For example, when the base transceiver stations within the umbrella base transceiver station uses the channel i, channel 2 and channel 3, respectively, as their frequency channels to transmit/receive signals to/from the mobile stations, the umbrella base transceiver station performs transmission/reception to/from the remote repeater using the idle frequency channel, for instance, channel n, among the commercial frequency channels. As described above, the present invention employs the umbrella base transceiver station and remote repeater to allow transmission/reception between the umbrella base transceiver station and mobile stations in blanket area to be carried out. Here, transmission/reception between the umbrella base transceiver station and repeater uses the idle commercial frequency.
The remote repeater of the mobile communication system according to the present invention includes a first antenna 1 for 1 0 receiving a signal from the umbrella base transceiver station, receiving a signal from the remote repeater and sending it to the umbrella base transceiver station, a first duplex 2, connected to first antenna i, for enabling bothway communication, a first low-noise amplifier 3 for amplifying the signal transmitted through the first duplex, a first combiner 4 for converting the frequency band of the signal received through the first duplex into a first frequency band, a first bandpass filter 5 for filtering the output signal of the first combiner, a splitter 6 for splitting the output signal of the first bandpass filter, a plurality of forward channel converters 100-1-n for converting the frequency channel of the signal split by the splitter into the commercial frequency channel in each coverage area, a summer 9 for summing up the output signals of the plurality of forward channel converters, a second duplex 10, connected to the summer, for enabling bothway communication, a second antenna 16 for sending the signal transmitted through the second duplex to the blanket area and receiving a signal from a mobile station in a specific area, and a backward channel converter 200 for converting the commercial frequency channel of the signal received from the mobile station by the second antenna into an o idle commercial frequency channel.
10 Forward channel converter 100 includes a second combiner 7- 1 l-n for converting the frequency of the signal filtered by the 555S55 bandpass filter into the commercial frequency band in each coverage area, and a high-power amplifier 8-1-n for amplifying the power of the signal whose frequency is converted by the 5 second combiner. Backward channel converter 200 includes a lownoise amplifier 11 for amplifying the signal of the mobile station, which is transmitted at a commercial frequency channel through the second duplex, a third combiner 12 for converting the frequency of the signal amplified by the low-noise amplifier into a second frequency of the commercial frequency channels in each coverage area, a second bandpass filter 13 for filtering the signal converted by the third combiner, a fourth combiner 14 for converting the frequency of the signal filtered by the second bandpass filter into the idle commercial frequency channel, and a high-power amplifier 15 for amplifying the signal converted by the fourth combiner.
The operation of the remote repeater is explained below. The remote repeater receives a signal from the umbrella base transceiver station, converts its frequency channel and transmits it to the mobile station. The remote repeater also receives a signal from the mobile station, converts its frequency channel and transmits it to umbrella base transceiver station. There is explained below the operation of receiving the signal from umbrella base transceiver station and transmitting it to the mobile station.
The signal is received by first antenna 1 from the umbrella base transceiver station, and then it passes through duplex 2, to be amplified by low-noise amplifier 3. The amplified signal is modulated by first combiner 4 into a predetermined frequency band. This is for facilitating filtering process in the filter.
That is, the aforementioned signal modulation is required because it is difficult to realize a filter which can filter a signal at a high frequency band. The modulated signal is filtered by first bandpass filter 5 in order to correctly split the signals of commercial frequency channels of Fig. 2. The filtered signal is split by channels using splitter 6 into signals to be sent to the blanket area of each base transceiver station. The signals split by splitter 6 are modulated by second combiner 7-1-n into commercial frequency channels in each blanket area, shown in Fig.
2. The modulated signals are amplified by high power amplifier 8, increasing their transmission powers. The signals which passed through the plurality of forward channel converters 100-1-n are summed up, to be transmitted from the second antenna through 10 duplex 10 to the mobile station.
Plurality of forward channel converter 100-1-n are required, *o**ee when neighboring cells use multiple frequencies, for supporting it. That is, the plurality of forward channel converter split reception signals, convert them into multiple corresponding signals and then transmit them, thereby preventing service disconnection and ping-pong effect on the boundary between the base transceiver stations.
There is explained below the operation of the remote repeater, which receives a signal from the mobile station, modulates its frequency channel and transmits it to the umbrella base transceiver station. The signal is received by the second antenna from the mobile station, and then amplified by low-noise amplifier 11. The amplified signal is modulated by third combiner 12 into a predetermined frequency band to facilitate filtering of the signal transmitted at a commercial frequency channel from the mobile station. The modulated signal is filtered by second bandpass filter 13. The filtered signal is modulated by fourth combiner 14 into a frequency of the idle frequency channel among the commercial frequency channels. The power of the signal modulated into the idle frequency channel is amplified by the high-power amplifier, to be sent to the umbrella base transceiver 10 station through first antenna 1.
The above-described mobile communication system using the Soooo.
umbrella base transceiver station of the present invention has the following advantages. Upon setting up of the umbrella base transceiver station, multiple base transceiver stations are 4i5 covered together under the umbrella base station, solving the blanket area problem in corresponding area without adding "I multiple base transceiver stations. Moreover, the idle frequency *:too: channel is used through frequency conversion, not disturbing calling in the coverage area of the base transceiver stations under the umbrella base station. Furthermore, the blanket area problem can be solved cheaply without regard to the arrangement of the base transceiver stations. According to the mobile communication system and method of the present invention, the umbrella base transceiver station and remote repeater are employed, thereby solving the blanket area.
It will be apparent to those skilled in the art that various modifications and variations can be made in the mobile communication system and method for solving blanket area of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided 0 they come within the scope of the appended claims and their equivalents.
4*
Claims (7)
1. A mobile communication system, comprising: a plurality of base transceiver station each of which has a predetermined coverage area; an umbrella base transceiver station having the coverage area which covers the coverage areas of the plurality of base transceiver stations; and a remote repeater set up in blanket area which is located between the plurality of base transceiver stations, the remote C. repeater being for carrying out transmission/reception to/from the umbrella base transceiver station using an idle frequency band among frequency bands used by the plurality of base transceiver stations, and converting the idle frequency band used in transmission/reception to/from the umbrella base transceiver 15 station into at least one frequency band used by the plurality of base transceiver stations, to perform transmission/reception S• to/from a mobile station in the blanket area.
2. The mobile communication system as claimed in claim 1, wherein the remote repeater comprises: a first antenna for receiving a signal from the umbrella base transceiver station, receiving a signal from the remote repeater and sending it to the umbrella base transceiver station; a first duplex, connected to the first antenna, for enabling bothway communication a first low-noise amplifier for amplifying the signal transmitted through the first duplex; a first combiner for converting the amplified signal into a first frequency band; S•a first bandpass filter for filtering the output signal of *.1O the first combiner; a splitter for splitting the output signal of the first 0 e bandpass filter; *00 a plurality of forward channel converters for converting the egos ••0o frequency of the signal split by the splitter into at least one 5 commercial frequency band; OS.. a summer for summing up the output signals of the plurality 000-" of forward channel converters; a second duplex, connected to the summer, for enabling bothway communication; a second antenna for transmitting/receiving the signal transmitted through the second duplex to/from the mobile station in the blanket area; and a backward channel converter for converting the commercial frequency band of the signal received from the mobile station by the second antenna into the idle commercial frequency band.
3. The mobile communication system as claimed in claim 2, wherein the each of the forward channel converters comprises: a second combiner for converting the frequency of the signal filtered by the bandpass filter into a commercial frequency band in coverage area; and a high-power amplifier for amplifying the power of the signal whose frequency is converted by the second combiner. The mobile communication system as claimed in claim 2, wherein the backward channel converter comprises: a low-noise amplifier for amplifying the signal of the mobile station, which is transmitted at a commercial frequency 15 channel through the second duplex; a third combiner for converting the frequency of the signal amplified by the low-noise amplifier into a second frequency of the commercial frequency channel in each coverage area; a second bandpass filter for filtering the signal converted by the third combiner; a fourth combiner for converting the frequency of the signal filtered by the second bandpass filter into the idle commercial frequency channel; and a high-power amplifier for amplifying the signal converted by the fourth combiner. A communication method in a mobile communication system including a plurality of base transceiver stations each of which has its coverage area, the method comprising the steps of: an umbrella base transceiver station transmitting signals S10 at an idle frequency which is not used by the plurality of base Stransceiver stations among a commercial frequency band, the umbrella base transceiver station transmitting the signal with ooo a transmission power which covers the coverage areas of the plurality of base transceiver stations; a remote repeater, set up in the blanket area located between the plurality of base transceiver stations, receiving the •e idle frequency, converting it into a frequency band used by the plurality of base transceiver stations, and transmitting/ receiving it to/from a mobile station in the blanket area; and the remote repeater converting the signal at the commercial frequency band, received from the mobile station, into the idle frequency band, and transmitting it to the umbrella transceiver station.
6. The method as claimed in claim 5, wherein the step of transmitting signals to the mobile station by the remote repeater comprises the substeps of: amplifying the signal received from the umbrella base transceiver station; converting the frequency band of the amplified signal; filtering the signal whose frequency band is converted, using a bandpass filter; 0 splitting the filtered signal into multiple frequency bands; o. converting the frequencies of the split signals into at least one commercial frequency band used by the plurality of base transceiver stations; and 15 amplifying the signals whose frequencies are converted, and transmitting them to the mobile station. *0*
7. The method as claimed in claim 5, wherein the step of transmitting signals to the umbrella base transceiver station by the remote repeater comprises the substeps of: amplifying the signal received from the mobile station; converting the frequency band of the amplified signal; filtering the signal whose frequency band is converted, using a bandpass filter; converting the filtered signal into the idle frequency band; and amplifying the converted signal, and transmitting it to the umbrella base transceiver station.
8. A mobile communication system substantially as herein described with reference to Figures 2 and 3 of the accompanying drawings.
9. A communication method in a mobile communication system substantially as herein described with reference to Figures 2 and 3 of the accompanying drawings. DATED this 1 6 t h day of February 2000 MTI CO., LTD. JUNI AUSTRALIA PTY LTD By their Patent Attorneys CULLEN CO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU17542/00A AU751627B2 (en) | 2000-02-16 | 2000-02-16 | Mobile communication system and method for solving blanket area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU17542/00A AU751627B2 (en) | 2000-02-16 | 2000-02-16 | Mobile communication system and method for solving blanket area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1754200A AU1754200A (en) | 2001-08-23 |
| AU751627B2 true AU751627B2 (en) | 2002-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU17542/00A Ceased AU751627B2 (en) | 2000-02-16 | 2000-02-16 | Mobile communication system and method for solving blanket area |
Country Status (1)
| Country | Link |
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| AU (1) | AU751627B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5659879A (en) * | 1993-07-30 | 1997-08-19 | Alcatel N.V. | Method of covering shadow areas in a cellular mobile radio system and radio booster for implementing this method |
| EP0860953A1 (en) * | 1997-02-21 | 1998-08-26 | Sagem Sa | Method of radiotelephone communication between a base station and a mobile telephone by means of a repeater |
-
2000
- 2000-02-16 AU AU17542/00A patent/AU751627B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5659879A (en) * | 1993-07-30 | 1997-08-19 | Alcatel N.V. | Method of covering shadow areas in a cellular mobile radio system and radio booster for implementing this method |
| EP0860953A1 (en) * | 1997-02-21 | 1998-08-26 | Sagem Sa | Method of radiotelephone communication between a base station and a mobile telephone by means of a repeater |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1754200A (en) | 2001-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC1 | Assignment before grant (sect. 113) |
Owner name: MTI CO., LTD. Free format text: THE FORMER OWNER WAS: MTI CO., LTD. JUNI AUSTRALIA PTY LTD |
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| FGA | Letters patent sealed or granted (standard patent) |