KR200304926Y1 - An apparatus for sharing with antenna feeder of mobile communications - Google Patents

Abstract

The present invention relates to an antenna feeder common device used in base stations of various mobile communication systems, and more particularly, to use a conventional mobile communication system to integrate a next-generation mobile communication service that will be serviced in the future. The present invention relates to an antenna feeder common device for a mobile communication antenna having a common antenna feedline, which can compensate for a feeding loss due to a different system.

The purpose of the present invention is to provide an integrated tower tower amplification device for wireless communication that integrates the next generation mobile communication service using existing installed base station and tower tower amplification device, while reducing system additional cost and using antenna feeder in common. .

Therefore, the present invention is equipped with a diplexer (complex) to use a common antenna feedline to compensate for the loss of the feed by different systems, by using the existing base station and tower tower amplification device to integrate the next generation mobile communication service Because it can be used to reduce the additional cost of the system, it is effective to improve the propagation environment by preventing the disruption of base station equipment.

Description

An apparatus for sharing with antenna feeder of mobile communications}

The present invention relates to an antenna feeder common device used in base stations of various mobile communication systems, and more particularly, to use a conventional mobile communication system to integrate a next-generation mobile communication service that will be serviced in the future. The present invention relates to an antenna feeder common device for a mobile communication antenna having a common antenna feedline, which can compensate for a feeding loss due to a different system.

In the conventional mobile communication base station system consisting of a base station device and an antenna, when the antenna is installed far from the base station device, the reception performance of the system is increased due to an increase in the reception noise figure (NF) due to the long transmission line connecting them. In order to compensate for the deterioration, tower tower amplification apparatuses for improving reception performance by mounting a transmission / reception filter and a low noise amplifier close to the antenna constituting the front end of the base station apparatus are widely used.

Figure 1A is a block diagram showing an embodiment of a tower tower amplification apparatus according to the prior art. In FIG. 1A, the transmission (Tx) signal from the base station is sent out to the space by the antenna 11 via the transmission filter 14. On the contrary, the reception (Rx) signal received by the antenna is amplified by the low noise amplifier 13 through the reception filter 12 and then transmitted to the base station through a cable. This method has a disadvantage in that separate transmission / reception paths are required for separate transmission and reception paths.

Figure 1B is a block diagram showing another embodiment of the tower tower amplification apparatus according to the prior art as to solve the above problems. In FIG. 1B, the transmission (Tx) signal from the base station passes only the transmission signal at the duplexer 15 and is sent out to the space by the antenna 11. On the contrary, the reception (Rx) signal received by the antenna is amplified by the low noise amplifier 13 through the reception filter 12, and then only the reception signal is passed through the duplexer 15 and transmitted to the base station through a cable.

However, since only one communication system is used in this manner, the next-generation mobile communication service, which is to be serviced in the future, cannot be used, and in particular, it cannot cope with a trend such as the recent reduction of the system cost or the common use of the base station to prevent the base station equipment from being disrupted. There is another problem.

The present invention is to solve the above problems, by using the existing base station and tower tower amplification device to integrate the next-generation mobile communication services, while reducing the additional cost of the system antenna feeder for mobile communication antenna feeder can be used in common The technical problem is to provide a common device.

Figure 1A is a block diagram showing an embodiment of a tower tower amplification apparatus according to the prior art.

Figure 1B is a block diagram showing another embodiment of the tower tower amplification apparatus according to the prior art.

Figure 2 is a block diagram showing an embodiment of a mobile communication antenna feeder common apparatus according to the present invention.

Figure 3 is a block diagram showing another embodiment of the antenna communication line common device for mobile communication according to the present invention.

※ Explanation of codes for main parts of drawing

11. Antenna 12. Reception Filter

13. Low Noise Amplifier 14. Transmit Filter

15. Duplexer 21. First Antenna

22. First Band Receive Filter 22-1. First Band Receive Filter 223. First Band Low Noise Amplifier 24. First Band Transmit Filter

31. Second antenna 32. Second band transmission / reception filter

41. Antenna feeder 42. Diplexer

51. Common antenna

Therefore, the present invention devised to solve the above technical problem is a first antenna for transmitting and receiving a radio signal or a second antenna; and a plurality of communication systems that are input through the first antenna or a common antenna A first band receiving filter for filtering a received signal of a first band among the received signals, and a first band low noise amplifier for receiving the filtered signal from the first band receiving filter and amplifying the signal with a predetermined gain; A first band reception filter 2 for receiving an amplified signal from a band low noise amplifier and filtering and outputting the amplified signal; and a first band transmission for filtering a first band transmission signal and outputting the free band through the first antenna or a common antenna A filter; and filters the transmission and reception signals of the second band transmitted and received through the second antenna or the common antenna. A second band transmission / reception filter; and an antenna feed line for feeding signals of the first band and the second band; and a diple separating two different signals of the first band and the second band to share the antenna feed line. Lexer; configured to include.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the antenna communication line common device for a mobile communication according to the present invention. In the following description, the same or corresponding members are given the same reference numerals and description thereof will be omitted.

2 is a block diagram illustrating an embodiment of a mobile communication antenna feeder common apparatus according to the present invention. In FIG. 2, the transmission (Tx) signals from the first band base station (BTS) and the second band base station are input to the diplexer 42 and then through the shared antenna feed line 41, respectively. ) Is applied to the second band transmission / reception filter 32 and filtered, the transmission signal of the first band is sent to the space by the first antenna 21 and the transmission signal of the second band to the second antenna 31. . An antenna capable of transmitting and receiving a signal of the first band is used as the first antenna 21, and an antenna capable of transmitting and receiving a signal of the second band is used as the second antenna 31.

On the contrary, the first band reception (Rx) signal received by the first antenna 21 is amplified by the first band low noise amplifier 23 through the first band reception filter 22 and then the first band reception is performed again. Filtered by filter 2 (22-1) and then applied to the antenna feed line (41). In addition, the reception (Rx) signal of the second band received by the second antenna 31 is filtered by the second band transmission / reception filter 32 and then applied to the antenna feed line 41.

In addition, two different reception signals of the first band and the second band applied to the antenna feed line 41 are separated by the diplexer 42 and transmitted to the first band base station and the second band base station, respectively. .

3 is a block diagram showing another embodiment of a mobile communication antenna feeder common apparatus according to the present invention for sharing the antennas as one. In FIG. 3, the transmission signals from the first band base station and the second band base station are input to the diplexer 42 and then transmitted and received with the first band transmission filter 24 and the second band through the shared antenna feed line 41, respectively. Filtered and applied to the filter 32, the transmission signals of these first and second bands are sent out to the space by the common antenna 51. As the common antenna 51, a dual band antenna capable of transmitting and receiving signals of both the first band and the second band is used.

On the contrary, the received signal of the first band received by the common antenna 51 is amplified by the first band low noise amplifier 23 through the first band receive filter 22 and then again received by the first band receive filter 2 (22). Filtered by -1) and then applied to the antenna feed line 41. In addition, the received signal of the second band received by the common antenna 51 is filtered by the second band transmission / reception filter 32 and then applied to the antenna feed line 41.

In addition, two different received signals of the first band and the second band respectively applied to the antenna feed line 41 are separated by the diplexer 42 and transmitted to the first band base station and the second band base station, respectively. .

In this case, the second band may be a low frequency band, and an existing communication system may be used. For example, a 800 MHz band cellular system or a 1.8 GHz personal mobile communication (PCS) system may be used. . In addition, the first band is a high frequency band, and a next generation mobile communication (IMT-2000) system of a 2.1 GHz band to be serviced in the future may be used.

Therefore, the service operator of the existing mobile telephone system uses the mobile telephone system as the second band and the next-generation mobile communication system as the first band, or the mobile telephone system as the second band and the personal mobile communication system system as the first band. The service operator of the existing personal mobile communication system can use the personal mobile communication system as the second band and use the next generation mobile communication system as the first band.

In this case, in order to smoothly operate the next-generation mobile communication service in the existing mobile phone base station or personal mobile communication base station, since the frequency is relatively high, the tower tower amplification device should be installed in the antenna feeder to secure the service area. As described above, the antenna feed line 41 can be efficiently used by further providing the diplexer 42.

In other words, the present invention is to share the feeder for supplying a signal to the antenna in several frequency bands, if the radio communication system with different frequencies to share the tower (tower) for the service in the same area to share the feeder And compensate for the loss in the relatively high frequency band to have the same service area.

In general, the transmission loss L _transmission in a wireless communication system is obtained by Equation 1 below.

Where L _free-space represents free space loss, L _terrain represents loss due to terrain and features, L _feeder represents feeder loss, G _antenna represents the gain of the antenna, d represents the distance between the base station and the mobile station (km), f Is the frequency in GHz. As can be seen in Equations 1 and 2, the free space loss increases as the frequency increases, and the transmission loss is affected by the free space loss and the feed line loss, but the feed line loss increases as the frequency increases. However, if the tower is to be shared by a system with a different frequency band, the loss of the high frequency band must be compensated.

In particular, the recent mobile communication service transmits and receives a large amount of data such as text and video as well as voice calls, and if the transmission loss increases in a high frequency band system, the bit error rate (BER) increases, resulting in poor communication quality. Therefore, a system for compensating for the transmission loss is inevitably required. Table 1 below shows the minimum power level with respect to the threshold of the bit error rate according to the communication speed.

In this case, Table 1 means that the minimum power level must be increased in order to maintain the same bit error rate threshold as the communication speed increases. Therefore, as described above, the transmission loss increases as the frequency of use increases, and the minimum power level increases as the communication speed increases, as shown in Table 1, so that the service operator transmits / receives the power level to maintain the same cell coverage. Need to be increased.

Such a system standard can increase the power level by increasing the transmit power at the base station, but can not increase the transmit power of the terminal at the base station. Method is used.

However, as described above, conventionally, only one communication system installed previously cannot be used, and next-generation mobile communication, which will be serviced in the future, cannot be used. In the present invention, the antenna feeder is commonly used with a diplexer so as to integrate the next-generation mobile communication service to be serviced by using the existing mobile communication system. The problem of the prior art was solved by allowing compensation. Table 2 shows the effect of reducing the number of feeder lines according to the present invention with respect to the number of feeder lines according to the prior art in a three-sector or six-sector base station. As can be seen in Table 2, according to the present invention, the system cost is reduced by reducing the number of feeders, and the load of the tower is reduced.

By the above configuration, the antenna communication line common device for mobile communication according to the present invention simplifies the system configuration and compensates for the feed line loss according to the frequency band, thereby reducing the feeder cost and suppressing the double investment of the base station tower. Importantly, it is possible to secure the power level for the boundary value of the bit error rate according to the communication speed and capacity.

Although the antenna feeder common device for mobile communication according to the present invention has been illustrated and described with respect to preferred embodiments, the scope of the present invention is not limited thereto, and it can be variously extended and applied based on the technical idea. It is obvious to him.

As described above, the present invention is provided with a diplexer to compensate for power loss due to different systems by using an antenna feeder in common, and integrates a next generation mobile communication service using a base station and a tower tower amplification device that is installed. It can be used to reduce the additional cost of the system and to improve the propagation environment by preventing the base station equipment from being disrupted.

Claims (3)

A first antenna to a second antenna or a common antenna for transmitting and receiving a radio signal; and A first band reception filter for filtering a reception signal of a first band among reception signals of a plurality of communication systems inputted through the first antenna or a common antenna; and A first band low noise amplifier which receives the filtered signal from the first band receiving filter and amplifies and outputs the signal with a predetermined gain; and A first band receiving filter 2 which receives the amplified signal from the first band low noise amplifier and filters and outputs the amplified signal again; A first band transmission filter for filtering a first band transmission signal and outputting the first band transmission signal to free space through the first antenna or a common antenna; and A second band transmission / reception filter for filtering a transmission / reception signal of a second band transmitted / received through the second antenna or a common antenna; and An antenna feed line for feeding signals in the first band and the second band; And a diplexer that separates two different signals of a first band and a second band to share the antenna feed line. delete The method of claim 1, wherein the first band, And a frequency band higher than that of the second band.