KR20060016015A - Interface apparatus between base station and repeater in a mobile internet service - Google Patents

Abstract

The present invention provides a device for interfacing a base station and a portable internet repeater in a portable Internet service using a time division duplex (TDD) method: installed at an antenna port of the base station to extract an electromagnetic wave signal of a main signal emitted through an antenna, or Transmitting coupler; Switch means installed between the coupler and the repeater to switch the switch to a receiving terminal or a transmitting terminal according to a control signal output from the repeater; And an attenuator installed between the receiving terminal or the transmitting terminal of the switch means and the repeater to attenuate the level of the power signal output through the coupler or applied to the coupler. In order to secure isolation, it can be changed to a coupler that attenuates 20dB, and instead of a circulator, it uses switch means with excellent isolation characteristics and additionally inserts a 30dB attenuator to maximize the isolation of transmission and reception channels to prevent malfunction of the repeater to increase reliability. In addition, the present invention provides a matching device between a mobile internet repeater and a base station capable of providing a high quality service by reducing noise.

Description

Matching device between mobile internet repeater and base station {INTERFACE APPARATUS BETWEEN BASE STATION AND REPEATER IN A MOBILE INTERNET SERVICE}             

1 is a diagram illustrating a matching device between a general CDMA repeater and a base station,

2 is a diagram illustrating a matching device between a repeater and a base station according to an example of the prior art;

3 is a view showing a matching device between a mobile internet repeater and a base station according to the present invention;

4 is a view showing the structure of a coupler applied to the present invention,

5 is a view showing the structure of the switch means applied to the present invention.

    Explanation of symbols on the main parts of the drawings

100: mobile Internet base station 110: antenna port

120: interface 121: coupler

125: switch means 127: attenuator

128: transmit attenuator 129: receive attenuator

140: donor repeater 160: remote repeater

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable internet repeater, and more particularly, to a matching device of a portable internet repeater and a base station for interfacing a base station and a portable internet repeater in a portable internet service using a time division duplex (TDD) method. It is about.

Recently, discussions on mobile Internet services in the 2.3 GHz band have been actively conducted, and the mobile Internet creates a new communication market following CDMA and high-speed internet, and also converges in the current trend of industrial development. It is expected to be a representative of the industry.

The 2.3GHz band 'portable Internet' is a service that enables broadband high-speed Internet even in the mid- to low-speed movement, and compared to the conventional wireless LAN and high-speed Internet service, the Internet can be used in a mobile environment (less than 60km per hour). Compared to multimedia mobile phone service such as EVDO, EVS has been spotlighted because its transmission speed can be increased up to 10 times (3 Mbps down).

Representative technologies that provide wireless Internet pilot service based on TDD technology include Japan's PHS technology, ArrayComm's i-busrt technology and IP Wireless's technology.

As PHS in Japan has recently shifted from voice-centric to data-oriented services, PHS demand has been revitalized, but so far, it is based on the technology of ArrayComm's i-Burst and IP Wireless, which aims only at the data services market. Looking at the trend of wireless Internet services, most of the big telecommunications manufacturers have not been active in the development of TDD technology, except for Siemens, which announced the TDD prototype.

The lukewarm attitude of large manufacturers to the development of TDD technology is due to the fact that the current mobile market is formed around the frequency division duplex (FDD) of IMT-2000. Currently, companies such as ArrayComm, IP Wireless, Inter Digital, Navini, and Broadstorm are participating in the development of TDD technology, and some companies provide commercial products.

TDD (Time Division Duplex) technology supports bidirectional transmission using the same frequency band, unlike the FDD scheme that uses different frequency bands for uplink and downlink for bidirectional communication. Theoretically, the same data rate support is possible using fewer timeslots than FDD, and the technical nature of the time slot's dynamic allocation makes it suitable for transmission of asymmetric or bursty applications. It is expected to be a very attractive technology for telecom operators who want to provide wireless Internet service.

In the case of the portable Internet, a portable Internet base station and a repeater are required, such as a CDMA mobile communication service. An interest of the present invention is how to use a repeater by connecting a repeater to a base station.

In general, the method of matching a repeater with a base station differs from the CDMA mobile communication using the FDD method and the matching method in the portable Internet using the TDD method.

In general, the matching scheme in the CDMA repeater 40 using the frequency division duplex (FDD) scheme is an antenna of the CDMA base station 10 because the frequencies of the transmission channel TX and the reception channel RX are different as shown in FIG. A coupler 20 and a duplexer 30 are added to match the port 15.

However, in the portable Internet, the transmission channel TX and the reception channel RX have the same frequency in a time division duplex (TDD) scheme, and thus, isolation of the transmission channel TX and the reception channel RX becomes a problem.

In general, a method easy to think of is a method of matching the portable Internet base station 50 and the repeater 80 by inserting the coupler 60 and the circulator 70 as shown in FIG. 2.

The circulator 70 is a three-terminal signal branch circuit element, in which a magnetic body such as a resonance plate and a ferrite is disposed in a shape in which three ports are surrounded at a 120-degree angle, and the circulator 70 is disposed. The characteristic of is that the power incident to one port is output to only one of the other two ports, the other is not output.

Depending on the design, power goes only to the right or left port and not to the rest. Thus, as a three-port device rotates directionally, it transmits signals only to ports in a specific direction.

However, when the circulator 70 is used as the matching device of the mobile Internet base station 50 and the repeater 80, the isolation of the transmission / reception channels TX and RX is considerably dropped so that the transmission signal is reconstructed to the reception channel RX. There is a situation in which the repeater 80 malfunctions or noise is generated so that the relay 80 does not function properly as the repeater 80.

Accordingly, an object of the present invention is to provide a portable Internet repeater and a base station that can eliminate the malfunction of the repeater by maximizing the isolation between the transmission channel and the reception channel in the case of a portable Internet using a TDD (Time Division Duplex) method. To provide a matching device.

Another object of the present invention is to directly interface to the antenna port of the base station of the method of interfacing the repeater with the portable Internet base station in the mobile Internet service, by securing the best isolation characteristics by the appropriate combination of coupler, switch means and attenuator The present invention provides a matching device between a mobile internet repeater and a base station capable of preventing malfunctions.

Technical means of the present invention for achieving the above object, in the apparatus for interfacing the base station 100 and the portable Internet repeater 140 in a portable Internet service using a time division duplex (TDD) method: an antenna of the base station 100 A coupler 121 installed at the port 110 and extracting an electromagnetic signal of the main signal emitted through the antenna or transmitting the electromagnetic signal to the base station 100; Switch means 125 installed between the coupler 121 and the repeater 140 to switch the switch to the receiving terminal (125-3) or the transmitting terminal (125-2) in accordance with the control signal output from the repeater 140 ; And a power signal installed between the receiving terminal 125-3 or the transmitting terminal 125-2 and the repeater 140 of the switch means 125 and outputted through the coupler 121 or applied to the coupler 121. And an attenuator 127 that attenuates the level.

Specifically, the coupler 121 is configured to attenuate the power 20dB with a sampler for extracting the main signal output from the base station 100 to 20: 1 [dB], the switch means 125 is a transmission and reception channel Isolating is about 50 to 60dB, the attenuator 127 is installed between the repeater 140 and the transmission terminal 125-2 of the switch means 125 is applied to the signal to the coupler 121 It consists of a transmission attenuator 128 to attenuate, and a reception attenuator 129 installed between the receiving terminal 125-3 of the switch means 125 and the repeater 140 to attenuate the signal output through the coupler 121. The signal attenuation of the reception attenuator 129 or the transmission attenuator 128 is 30 dB.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 illustrates a matching device between the portable Internet repeater 140 and the base station 100 according to the present invention, and includes a base station 100, a coupler 121, a switch means 125, an attenuator 127, and a donor repeater. 140, and a remote repeater 160.

In general, in order to expand the cell managed by the mobile Internet base station 100 or service a shadow area during the mobile Internet service, the cell is extended or the shadow area is eliminated using the portable internet repeater 140, and the repeater 140 It connects to the remote repeater 160 through the optical path 150 to the extended area or the shaded area through the Internet service to the mobile communication terminal 180 in the cell corresponding to the area.

In this way, the repeater 140 is required for the portable Internet service. In this case, the repeater 140 should be matched with the base station 100. Although there are several types according to the matching method, there is an unavoidable case to be connected to the antenna port 110.

In the time division duplex (TDD) type portable Internet, since the carrier frequencies of the transmission channel TX and the reception channel RX are the same, the isolation between the transmission channel TX and the reception channel RX is very important. Therefore, the repeater 140 and the base station 100 must be matched in such a manner as to maximize the isolation of the transmission channel TX and the reception channel RX.

The base station 100 accesses the corresponding Internet server through a predetermined exchange according to the web address requested from the repeater 140 or the web address requested from the mobile communication terminal 180, and receives request information from the Internet server. It is configured to transmit to the repeater 140 or transmit the request information to the mobile communication terminal in its cell.

The repeater 140 transmits the request information to the base station 100 in accordance with the requested Internet service request from the mobile communication terminal 180 such as a notebook, handheld, PDA, mobile phone, and transmits the information from the base station 100. Is provided and configured to deliver to the mobile communication terminal 180 in the cell.

The repeater consists of a donor repeater 140 and a remote repeater 160, the donor repeater 140 is configured to transmit and receive an RF signal with the base station 100, the remote repeater 160 and the donor repeater 140 Is connected to the optical cable 150 is configured to transmit and receive RF signals through the optical cable 150, but directly transmit and receive RF signals with the mobile communication terminal 180 in the cell.

In order to connect the donor repeater 140 with the base station 100, a matching is required, and a matching interface 120 is installed between the base station 100 and the donor repeater 140.

Interface 120 according to the present invention is composed of a coupler 121, the switch means 125 and the attenuator 127, the interface 120 may be separately installed outside the donor repeater 140, the donor repeater It may be embedded in 140.

That is, the coupler 121 is configured in the coupler is installed in the antenna port 110 of the mobile Internet base station 100 to extract the electromagnetic signal of the main signal emitted through the antenna, the switch means 125 is a coupler Installed between the 121 and the repeater 140 is configured to switch the switch to the receiving terminal 125-3 or the transmitting terminal 125-2 in accordance with the control signal output from the repeater 140, attenuator 127 ) Is a level of a power signal installed between the receiving terminal 125-3 or the transmitting terminal 125-2 of the switch means 125 and the repeater 140 and output from the repeater 140 or applied to the repeater 140. It is configured to attenuate.

The coupler 121 uses a phenomenon in which energy is exchanged between adjacent objects due to leakage electromagnetic waves generated from a line in an RF device, and a sampler which distributes and extracts the power of the main signal output from the base station 100 by 20: 1. Consists of That is, the coupler 121 extracts the RF signal output from the base station 100 but attenuates and outputs 20 dB.

The signal output through the coupler 121 is input to the attenuator 127 through the switch means 125, the signal attenuated through the attenuator 127 is input to the donor repeater 140.

The attenuator 127 is provided between the receiving terminal 125-3 of the switch means 125 and the repeater 140 to receive attenuator 129 for attenuating the signal output through the coupler 121, and the repeater The transmission attenuator 128 is provided between the transmission terminal 125-2 of the switch 140 and the switch 140 to attenuate the signal output from the repeater 140.

4 shows the coupler of FIG. 3, the coupler 121 applied to the present invention uses a coupler 121 of 20: 1, and the coupler 121 is connected to the base station 100. 1) and an output port 121-2 connected to the antenna through the main port 121-1 and a coupling port 121-3 connected to the repeater 140 side.

The coupler 121 is a device that extracts the main signal output from the base station 100 and outputs the signal to the repeater 140 or transmits the signal output from the repeater 140 to the base station 100. Conversely, the signal input to the coupler 121 is attenuated by 20 dB and transmitted to the base station 100.

And, as shown in FIG. 5, the switch means 125 receives the antenna terminal 125-1 connected to the coupler 121, the transmission terminal 125-2 connected to the transmission attenuator 128, and the reception attenuator 129. It is comprised by the terminal 125-3.

The transmission channel TX may move only a signal to the antenna terminal 125-1 by switching, and the signal of the antenna terminal 125-1 may move only to the reception terminal 125-3 by switching. However, there is a signal in which the signal of the transmission channel TX moves to the reception channel RX because the isolation characteristics of the transmission and reception terminals 125-2 and 125-3 of the switch means 125 are not ideal. The switch unit 125 has an isolation between the transmission and reception terminals 125-2 and 125-3, that is, the transmission channel TX and the reception channel RX, is approximately 50 dB to 60 dB.

The control means of the switch means 125 is a control signal of the switch means 125 is made by a separate algorithm inside the portable Internet repeater 140, so this separate algorithm for this is not mentioned in the present invention.

The attenuator 127 simply serves to attenuate only the signal.

In the portable internet service, the repeater 140 and the portable internet base station 100 interface with each other. In the repeater 140, the isolation of the transmission channel TX and the reception channel RX must be maintained at 100 dB or more. The present invention can accurately extract the received signal, and the present invention has a gist of trying to secure 100 dB or more of isolation.

Referring to the operation of the present invention configured as shown in Figure 3, the signal transmitted from the base station 100 is attenuated 20dB through the coupler 121 is applied to the switch means 125, the signal is again received by the switch means 125 It is input to the reception attenuator 129 through the terminal 125-3, and attenuates about 30 dB through the reception attenuator 129 and is input to the reception channel RX of the repeater 140.

On the contrary, the signal of the transmission channel TX of the donor repeater 140 is attenuated by 30 dB through the transmission attenuator 128 and applied to the transmission terminal 125-2 of the switch means 125. 20 dB attenuated again through the coupler 121 and is applied to the base station 100 through the antenna port 110.

In addition, the signal of the repeater 140 passing through the transmission attenuator 128 during the transmission is moved to the receiving terminal 125-3 due to the isolation problem of the switch means 125, but the transmission signal of the repeater 140 Since attenuated approximately 110 to 120 dB through 30 dB of the transmission attenuator 128, 50 dB to 60 dB of the switch means 125, and 30 dB of the reception attenuator 129, the signal is re-entered into the receiving channel RX of the repeater 140. 100 dB attenuation, which is the goal of the isolation of the transmission channel TX and the reception channel RX of 140, can be sufficiently achieved, and thus has little effect on the operation of the donor repeater 140.

Although specific embodiments of the present invention have been described and illustrated above, the total attenuation of the coupler and the attenuator can be adjusted somewhat within 50 dB, for example, the signal attenuation of the coupler is 10 to 30 dB and the attenuation of the attenuator is 20 to 40 dB. It is obvious that various modifications can be made by those skilled in the art. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

Therefore, in the present invention, when coupling the repeater through the antenna port of the base station by changing the coupler to attenuate 20dB to secure the isolation, by using a switch means excellent in isolation characteristics instead of the circulator, and additionally insert a 30dB attenuator, By maximizing the isolation of the transmission and reception channels to prevent malfunction of the repeater, it is possible to increase the reliability and reduce the noise to provide high quality service.

Claims (5)

An apparatus for interfacing a base station and a portable internet repeater in a portable Internet service using a time division duplex (TDD) method: A coupler installed at the antenna port of the base station to extract the electromagnetic signal of the main signal emitted through the antenna or to transmit the electromagnetic signal to the base station; Switch means installed between the coupler and the repeater to switch the switch to a receiving terminal or a transmitting terminal according to a control signal output from the repeater; And And an attenuator provided between a receiving terminal or a transmitting terminal of the switch means and a repeater to attenuate a level of a power signal output through the coupler or applied to the coupler. The method according to claim 1, The coupler is a matching device between the mobile Internet repeater and the base station, characterized in that the sampler for extracting the main signal output from the base station to 20: 1 [dB]. The method according to claim 1, The switch means is a matching device between the mobile Internet repeater and the base station, characterized in that the isolation of the transmission and reception channel is approximately 50 to 60dB. The method according to claim 1, The attenuator may include: a reception attenuator installed between the receiving terminal of the switch means and the repeater to attenuate a signal output through the coupler; And a transmission attenuator disposed between the repeater and the transmission terminal of the switch means to attenuate a signal applied to the coupler. The method according to claim 4, And the signal attenuation of the reception attenuator or the transmission attenuator is 30 dB.

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