KR20040004237A - Frequency converting wireless repeater using ISM band as link frequency for in-building service - Google Patents

Abstract

PURPOSE: An in-building frequency conversion repeater for using an ISM(Industrial, Scientific and Medical) frequency band as a link frequency is provided to offer radio communication services to the inside of a building by simply installing main and sub frequency conversion repeaters. CONSTITUTION: A charging cradle(311), at which a terminal(331) is installed, consists of a sub frequency conversion and amplification unit(322) and a charger(324). The sub frequency conversion and amplification unit(322) converts and amplifies a signal supplied from an antenna(321). The amplified signal is transmitted to a terminal antenna(332) through a coupler(323) by wireless. In addition, the charging cradle comprises a speaker or an audio output block(323).

Description

Frequency converting wireless repeater using ISM band as link frequency for in-building service}

The present invention uses a wireless repeater as a method to solve the case where a wireless communication signal such as mobile communication and satellite broadcasting is not drawn in a sufficient size in the building, a shadow area is generated, the outside to radiate a signal of sufficient size in the building The present invention relates to a method and apparatus for increasing the service signal strength in a building by using a frequency different from an external incoming signal as a link frequency without using the same frequency as the incoming signal.

The signal strength of wireless communication such as mobile communication and satellite broadcasting depends on the service area, the distance from the base station and the satellite, and the signal is weakened by obstacles on the radio wave propagation path. In particular, the interior of the building is attained with a significantly weaker signal strength than the exterior of the building and even out of service due to the building's radio-blocking effect. As a method for servicing the shadow area in the building, a wireless repeater that receives an external signal through an antenna and amplifies the signal and radiates it back into the building.

1 illustrates an existing indoor wireless communication service method. The satellite 101 and the mobile communication base station 102 may emit a voice or data signal to a service area or receive a signal from a terminal in the service area. Even if the building is within the service area, when the signal transmission loss of the building is large, the communication signal of a small intensity reaches the terminal 121 in the building, making service difficult. In order to increase the strength of the signal in the building, the antenna 111 is installed on the side of the building such as a window or the outside which can receive a relatively large signal compared to the inside of the building to receive signals from the satellite 101 and the base station 102. Done. This signal is amplified by a bidirectional or unidirectional amplifier 112 and radiated through an antenna 113 located inside the building. As a result, the terminal 121 receives a signal having a great strength, such as the outside, inside the building, thereby enabling a communication service. In the case of a mobile communication service that is bidirectional communication, a reverse link exists. In the reverse case, the opposite signal path is formed and the terminal 121 signal is sent to the base station 102 through the repeater 112.

However, if the amplification gain of the amplifier 112 is considerably high for the emission of a larger signal in a building, a part of the signal radiated through the internal service antenna 113 is directed to the external signal antenna 111 and returned to 114. The circular loop that amplifies and radiates is formed, which may cause oscillation of the amplifier, which may make it impossible to operate normally. In particular, when the external signal antenna 111 and the internal service antenna 113 are separated through the ground, such as underground, considerable separation can be obtained. However, apartments and ground offices are near to the interior of the building and close to the windows to obtain sufficient signal separation. I can't.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and simply installs a main frequency converter in order to provide a wireless communication service in a building.

The present invention not only improves the signal separation between the input and output antennas by separating the in-building repeater into the main, but also makes the installation easier by configuring the link via wireless.

1 illustrates an existing indoor wireless communication service method.

2 illustrates an improved indoor wireless communication service method.

3 illustrates a configuration of a terminal charging cradle incorporating a frequency converter / amplifier.

<Explanation of symbols for the main parts of the drawings>

101: satellite 102: wireless communication base station

111: external signal antenna 112: wireless communication repeater

113: antenna for internal service 114: signal induced path between the internal and external antenna

121: wireless communication terminal

211: external signal antenna (main frequency converter / repeater)

212: main frequency converter / amplifier 213: link antenna (main frequency converter / amplifier)

214, 225: service frequency

221: link antenna (副 frequency converter / amplifier)

222 frequency converter / amplifier

223: service antenna (副 frequency converter / amplifier)

224: link frequency between the main frequency converter and the amplifier

231: wireless communication terminal

311: Terminal Charging Cradle with Integrated Frequency Converter / Amplifier

321: built-in link antenna 322: frequency conversion / amplifier

323: coupler

324: Charger 325: Speak / Audio Out

326: power in port

327: link frequency 328: service frequency

331: wireless communication terminal 332: internal antenna antenna

The present invention for solving the above technical problem is to use the link frequency to ensure signal separation and to use the ISM band as the link frequency.

2 is an improved indoor wireless communication service method according to the present invention.

In the forward direction, external signal antenna 211 receives a signal from satellite 101 or base station 102 at frequency F1 214. The signal is converted into a frequency F2 224 through a main frequency converter / amplifier 212 and amplified and radiated through the antenna 213. Frequency F2 224 uses the ISM band. The link signal at the frequency of F2 224 is input to the frequency converter / amplifier through the antenna 221 and is frequency-converted and amplified to the service frequency F1 225 and radiated through the antenna 223. The terminal 231 communicates through a service frequency.

Figure 3 is a configuration of a charging cradle with a built-in power frequency converter / amplifier for one-way satellite broadcasting service. The charging cradle 311 is largely comprised of a frequency converter / amplifier 322 and a charger 324. The terminal is configured to be detachable from the charging cradle. The frequency converter / amplifier 322 converts and amplifies the signal received from the antenna 321 into a service frequency. The amplified signal is induced wirelessly from the coupler 323 to the terminal antenna 332. The charging cradle may also have a speaker or audio output 325. In the case of FIG. 2, since the ISM band is used as the link frequency, the frequency permit is unnecessary and there is an advantage in terms of efficient use of frequency resources by not using a separate band for the link frequency, but the output of the frequency converter / amplifier 222 If the increase or the amount of organic power between the link antenna 221 and the service antenna 223 increases, there is a disadvantage that the output should be small enough to prevent the oscillation of the amplifier. In order to reduce the organic power between the antennas, the service antenna 223 is embedded in the charging cradle 311 in the form of a coupler 323, and the internal antenna 332 of the terminal 331 is mechanically close to the coupler 323. By making the distance, the frequency conversion / amplifier 322 and the terminal 331 can be transmitted and received with less signal strength.

The present invention is to implement a repeater for the in-building service to directly radiate the incoming signal, and to radiate a signal of greater intensity in the building by increasing the signal separation between the external antenna and the service antenna by using the link frequency in the middle instead of directly amplifying the radiation into the building To do it. In particular, in case of the conventional frequency conversion repeater, a serviceable frequency is used separately because some of the available frequencies licensed by the operator are used as the link frequency. This can be an inefficient use of resources. In other cases, the link frequency uses a separate band, such as a microwave frequency, which also requires a frequency license and additional costs due to the use of resources.

The ISM band, which does not require a separate license, is a radio wave rule under the International Telecommunication Convention and is separately allocated for industrial, scientific, and medical purposes and consists of the following frequency bands. 6.765 kHz (± 15 kHz), 13.560 kHz (± 7 kHz), 27.120 kHz (± 163 kHz), 40.68 MHz (± 20 kHz), 2.450 GHz (± 50 MHz), 5.800 GHz (± 75 MHz), 24.125 GHz (± 125 MHz)

단말 The terminal charging cradle with the service antenna in the form of a coupler in the frequency converter / amplifier does not generate oscillation of the device due to the organic energy between the antennas of the frequency converter / amplifier so that it can be serviced with good signal quality anywhere in the room. do.

Mobile communication data service and digital satellite broadcasting can contribute to revitalization of data service and satellite broadcasting service because there are more users in buildings than outdoors such as India and roads.

Another advantage of using the built-in antenna charging cradle indoors is that the video playback is used due to the service characteristics, but the continuous play time is limited due to lack of battery capacity. When the power cord is connected, the charging cradle has no limit on continuous playback time, so the service can be used freely.

Claims (10)

In the downlink for transmitting a signal to the terminal in a wireless communication system, Means for receiving a service frequency signal received from outside the building; Means for converting the received service frequency signal into a link frequency signal which is an Industrial, Scientific & Medical (ISM) frequency different from the service frequency and transmitting the same into a building; A repeater having means for receiving said link frequency signal and converting it back to a service frequency 2. The apparatus of claim 1, further comprising: means for receiving a service frequency signal transmitted by the terminal for uplink transmission, which transmits the signal from the terminal to the wireless communication system; Means for converting and receiving the received service frequency signal into a link frequency signal of an Industrial, Scientific & Medical (ISM) frequency which is different from the service frequency signal; And a means for receiving the converted link frequency signal, converting it into a service frequency signal, and transmitting the converted link frequency signal to an outside of a building. The relay apparatus according to claim 1, wherein the means for converting the link frequency signal into a building is embedded in an antenna having a window attachment function. 3. The apparatus of claim 2, wherein the means for converting a service frequency signal into a link frequency on the downlink and transmitting it into a building is the same mechanism as the means for converting a link frequency signal into a service frequency signal on the uplink and transmitting it outside the building. Relay device included in The relay apparatus according to claim 2, wherein the means for converting a link frequency signal on the downlink into a service frequency signal is included in the same mechanism as the means for converting a service frequency signal on the downlink into a link frequency signal. 5. The relay apparatus according to claim 4, wherein the frequency converting means of the up-down link included in the same mechanism is built in the antenna with window attachment function. 2. The relay apparatus according to claim 1, further comprising a terminal charging function in a means for receiving the link frequency signal and converting the link frequency signal back to a service frequency. 6. The relay apparatus according to claim 5, wherein the terminal charging function is further provided in the frequency converting means of the up and down links included in the same mechanism. 9. A terminal charging cradle device according to any one of claims 7 and 8, wherein said frequency converting means includes a terminal charging function. 10. A terminal charging cradle device according to claim 9, comprising means for coupling a service frequency signal to a terminal antenna.