KR100909818B1 - Repeater system for deep shadow region in wcdma wireless communication network - Google Patents

Abstract

A repeater system for a shadow region using a frequency shift in a WCDMA(Wideband Code Division Multiple Access) wireless network is provided to remove the possibility of the malfunction by accessing a macro cell in a link region. A donor unit(10) is arranged inside a macro cell. A macro base station(100) outputs the frequency of the signal to a wireless link region. A remote unit(12) is separated and arranged with the donor unit. The remote unit transmits the signal transmitted by the donor unit to a first service region. The terminal relays the signal of center frequency by the terminal located within the service area.

Description

Repeater system for deep shadow region in WCDMA wireless communication network

The present invention relates to a repeater system used in WPC communication network, and more particularly, to a repeater system suitable for a shadow area such as a deep room where radio waves do not reach.

A repeater refers to a device that receives a weak signal and outputs a strong signal corresponding to it or reproduces a waveform. Such a repeater is installed in a shaded area where a base station of a mobile communication company cannot receive radio waves, for example, inside a large building or behind a mountain or hill, in a tunnel or subway station. Such shaded areas may also include small population centers, amusement parks, valleys, etc., where there is little traffic outside the base station's service area.

However, in the shaded area located inside the building, a coaxial cable is installed to transmit a signal to an area to provide a mobile communication service. However, when the distance to the shaded area is long, the length of the cable is increased, thereby increasing the installation cost and damaging the aesthetics of the building. Thus, there is a need for deep shadow area services based on a radio link structure.

On the other hand, a wireless link RF repeater has been proposed as a solution of a wireless LAN AP using Wi-Fi, but as can be understood by those skilled in the art, wireless LAN communication has a basic structure different from that of CDMA communication, such a wireless link repeater structure. Cannot be applied to CDMA communication as it is.

The technical problem to be achieved by the present invention can be applied to a deep shadow area based on a wireless relay method, not by wire, and when the link area is not a shadow area within the link area, the terminal is connected to only the macro cell and malfunctions. There is no possibility of providing a repeater system.

In the repeater system for a deep shadow area according to the present invention for achieving the technical problem in the repeater system for signal relay in the shadow area in the W U. C.D.M wireless communication network having a channel raster of N kHz,

A donor unit disposed in the macro cell and inputting a signal from the macro base station to shift the frequency of the input signal by an odd multiple of + 1 / 2N kHz and output it to a first region defined as a radio link region; And

A deep shadow is arranged by being spaced apart from the donor unit by shifting the frequency transmitted by the donor unit to a raster equal to odd times kHz of + 1/2 N or odd times kHz of-1/2 N. And a remote unit which transmits a signal of a center frequency that is an integer multiple of a positive integer N kHz to a terminal located in the first service area by transmitting to a first service area which is an area.

In addition, the donor unit is disposed in the macro cell and inputs a signal from the macro base station to shift the frequency of the input signal by an odd multiple kHz of + 100 to output to the first area defined as the radio link area, the remote unit Is spaced apart from the donor unit by a predetermined distance and further shifts the frequency of the signal transmitted by the donor unit to a raster equal to + 100 N kHz to send the first service area which is a deep shadow area by transmitting the first service area. It is preferable that the terminal located in the terminal be relayed to receive a signal having a center frequency that is an integer multiple of 200 kHz.

In addition, the repeater system,

A second signal disposed within the first service area and inputting a signal from the remote unit to shift the frequency of an input signal by an odd multiple of + 1 / 2N kHz to output to a second area defined as a second radio link area; Donor unit; And

The first service area is further spaced apart from the second donor unit by a predetermined distance and further shifts a frequency of the signal transmitted by the second donor unit to a raster equal to + 1/2 N kHz or-1/2 N kHz. It is also possible to further include a second remote unit for transmitting a signal shifted by an integer multiple of N kHz in the terminal located in the second service area by transmitting to a second service area that is a deeper shadow area.

According to the present invention, a repeater device can be applied to a deep shadow area based on a wireless relay method without using a wire, and a terminal device is connected only to a macro cell within a link area so that there is no possibility of malfunction.

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

The repeater system according to the present invention is most preferably applied to a wireless communication network such as a wide-band code-division multiple access (W-CDMA) wireless communication network. In the case of the PCS method, the frequency band of 1.8 GHz to 2.1 GHz is used for the cellular method and the 800 MHz band is used for the cellular method, and in the frequency band, the band of 1.23 MHz is used per FA for the CDMA 2G / 1X and W- CDMA communication uses a wider 5 MHz band.

In the case of W-CDMA wireless communication, it has a channel raster of 200 kHz and its center frequency is determined from an integer multiple of 200 kHz. In the present invention, in the repeater acting as a donor when the repeater is installed in the shaded area, the frequency is shifted, but the frequency is shifted to about the median frequency of the raster channel frequency or an odd multiple of the median. The experiment confirmed that the terminal is not connected to the frequency band by shifting the median frequency of the raster channel frequency or an odd multiple of the median, and connecting such a phenomenon to the repeater. That is, a terminal located in a frequency band shifted about the median frequency of the raster channel frequency or an odd multiple of the median of the raster channel frequency connects to the macro cell region of the existing frequency where the frequency is not shifted if the region is not a shadow region. . In a donor repeater, the signal amplified by shifting about half the raster channel frequency is received by the repeater acting as a remote unit and provided to a deep shadow area.

1 is a block diagram illustrating a structure of a repeater system for a deep shaded area according to an embodiment of the present invention. Referring to FIG. 1, the deep shadow area repeater system according to the present invention is disposed in the macro cell 102 and inputs a signal from the macro base station 100 so that an odd multiple kHz of + 1/2 N, for example, N is 200. The donor unit 10 has a donor unit 10 for shifting the frequency of the input signal by 100 or 300 or 500 kHz and outputting the first signal 104 to the first region 104 defined as the radio link region. At this time, the terminal is connected to the channel of the center frequency corresponding to an integer multiple of 200 kHz, the terminal is not connected in the band of the center frequency of 100 kHz. In the ^{W-CDMA 3GPP (3 rd Generation} Partnership Project) of the communication and defines a channel raster of 200 kHz in all the bands, when, by experiment shifting the frequency by half a unit of the channel raster was confirmed that the terminal is not connected . That is, the terminal located in the first region 104 connects only to the macro cell 102 and does not accept the signal amplified by the donor unit 10 and does not connect to the first region 104 which is the radio link region.

In addition, the repeater system for the deep shaded area according to the present invention is disposed spaced apart from the donor unit 10 by a predetermined distance, and the signal transmitted by the donor unit 10 is odd times of + 1/2 N kHz or − Positive shift at the terminal located within the service area by further shifting the frequency to a raster of an odd multiple of 1/2 N, for example, + 100 kHz or-100 N kHz, and sending it to the deeper shaded first service area 106. And a remote unit 12 for relaying to receive a signal of a center frequency that is an integer multiple of an integer N kHz.

For example, the donor unit 10 shifts and amplifies the input signal by an odd multiple of the center frequency + 100 kHz, 300 kHz, 500 kHz, or 100 kH, and the remote unit 12 amplifies the shifted signal by + 100 kHz or −. Shift the frequency further to 100 N kHz raster to change the frequency band to center frequency + 200 kHz or macro cell frequency. Thus, cell 106 is created and this cell 106 functions as a first service area.

However, when the wireless link area is a shaded area where the signal from the macro base station 100 does not reach, the donor unit is installed in the upper part of the hallway, and the remote unit is installed in the lower part of the hallway so that the wireless link area can make a call. It would be more desirable to install the area so that it would not be needed, such as a corridor area between underground parking lots.

2 is a view for explaining the operation and effect of the repeater system according to the present invention. Referring to FIG. 2, the signal in the macro cell region having the center frequency c is shifted by 100 kHz in the donor unit so that the center frequency is shifted by an odd multiple of c + 100 kH or 100 kHz. The remote unit shifts the signal shifted by the donor unit by an odd multiple of + 100 kHz or an odd multiple of-100 kHz so that its center frequency has an raster channel of an integer multiple of 200 kHz relative to the center frequency c of the macro cell. The terminal can be connected normally.

That is, the terminal can be connected to the macro cell region frequency band 210 and the first service region frequency band 214 shifted by an integer multiple of 200 kHz with respect to the center frequency c of the macro cell. However, the terminal is not connected to the radio link region frequency band 212 shifted by an odd multiple of 100 kHz with respect to the center frequency c of the macro cell.

Next, embodiments for frequency shift in the donor unit and the remote unit will be described. FIG. 3 is a block diagram illustrating an example of a structure for performing frequency shift in a donor unit and a remote unit as components of a repeater system according to the present invention. That is, the structure described below can be applied to both the donor unit or the remote unit. 3, a first PLL 300 and a second PLL 302 installed in a downlink path, a third PLL 304 installed in an uplink path, and a fourth PLL 306 are provided. The first PLL 300 is connected to the first downconversion mixer 326 and the second PLL 302 is connected to the first upconversion mixer 332. The third PLL 304 is connected to the second downconversion mixer 342 and the fourth PLL 306 is connected to the second upconversion mixer 348.

In addition, in the downlink path, the repeater according to the present invention is connected to a duplexer 322, which is used to separate frequencies in a frequency division scheme (FDD), to the first antenna 320 so as to amplify the output of the duplexer with low noise. A first LNA 324, an image cancellation filter 310 for canceling an image band excluding the first downlink frequency band from the low noise amplified signal, and a signal output from the image cancellation filter 310 to a first PLL ( A downconversion mixer 326 for downconverting using the signal output from 300, a bandpass channel filter 328 for bandpass filtering the downconverted signal, and a bandpass filtered signal for automatic gain adjustment An AGC-Automatic Gain Controller 330, a first upconversion mixer 332 that upconverts the gain adjusted signal using the signal output from the second PLL 302, and an upconverted A local cancellation filter 334 for canceling unnecessary bands from the call, a high output amplifier 336 for amplifying a signal from which unnecessary bands except the second downlink frequency band is canceled to high output for radio emission, and the high output amplifier 336 A second duplexer 338 connected to one end and a second antenna 339 are provided.

In addition, the repeater according to the present invention performs low noise amplification of a signal received through the second duplexer 338 and a second duplexer 338 that receives a signal received through the second antenna 339 in the uplink path. A second LNA 340, an image cancellation filter 314 for canceling an image band excluding the first uplink frequency band from the low noise amplified signal, and a signal output from the image cancellation filter 314 to a third PLL ( Gain is automatically adjusted by inputting a downconversion mixer 342 which downconverts using the signal output from 304, a bandpass channel filter 344 for bandpass filtering the downconverted signal, and a bandpass filtered signal. An AGC-Automatic Gain Controller 346, a second upconversion mixer 348 for upconverting the gain adjusted signal using the signal output from the fourth PLL 306, and a second uplink. frequency It made a local cancellation filter 316, the erase signal for erasing unnecessary band unnecessary bands other than the station to the high-power amplifier 350 for the high-power amplifier for radio emission. The signal amplified to high power is radiated through the first duplexer 322 and the first antenna 320. The bandpass filter 328 next to the up-conversion mixer 326 functions as a local rejection filter in the heterodyne IF method, and removes the harmonic component in the direct conversion method. Function as a filter.

FIG. 4 is a block diagram illustrating another example of a structure for frequency shifting in a donor unit and a remote unit as components of a repeater system according to the present invention. Referring to FIG. 4, a signal input terminal is connected to an output terminal of the first downconversion mixer 407, receives a signal output from the first downconversion mixer 407, and decodes the received signal to analyze the result. The apparatus further includes a signal analyzer 408 for outputting a control signal. The control signal output terminal of the signal analyzer 408 is connected to the first PLL 400, the second PLL 402, the third PLL 404, and the fourth PLL 406.

According to the embodiment, by performing a call quality analysis process comprising the step of analyzing the RSCP and Ec / Io to further include a signal analyzer 408 for providing signal quality analysis information to decode the received signal macro The original FA selection of the cell can be made. The signal analyzer 408 performs a call quality analysis process including analyzing RSCP and Ec / Io as in a user terminal to provide signal quality analysis information so that the FA having the best signal quality can be selected. The MCU (not shown) may analyze each situation by using signal quality analysis information provided from the signal analyzer 408 and set an input FA and an output frequency.

FIG. 5 is a block diagram illustrating another example of a structure for performing frequency shift in a donor unit and a remote unit as components of a repeater system according to the present invention. Referring to FIG. 5, a band pass channel filter including a SAW filter is implemented as digital filters 522 and 524 using DSP components. The digital filters 522 and 524 together with the signal analyzer 508 form the DSP unit 52. The configuration and operation of the mixers and filters connected to the first PLL 500, the second PLL 502, the third PLL 504, and the fourth PLL 506, respectively, are the same as those described with reference to FIG. 3. The description is omitted.

In the case of including the DSP unit 52 as described above, the call quality analysis process includes the step of analyzing the RSCP and Ec / Io by the signal analyzer 408 as in the user terminal as described with reference to FIG. 4. The signal quality analysis information is provided to select the FA having the best signal quality in the repeater, and the MCU (not shown) analyzes each situation using the signal quality analysis information provided from the signal analysis unit 408 and inputs the signal quality analysis information. FA, and output frequency can be set.

The signal analyzer 408 may be integrated into the DSP unit 52 in the form of a logic array. In addition, since the logic array inside the DSP part can easily change the performance of the digital filter by changing the coding, it is best to integrate the signal analysis unit in the form of a logic array in the DSP unit 52 as in the above embodiment. In addition to the ability to select FA, the characteristics of the channel filter can be very adaptive.

The repeater system according to the present invention as described above can be suitably applied to recent building structures. In recent years, the building is often made of a glass structure in order to take advantage of the aesthetic aspect, especially in the case of restaurants, coffee shops, and taverns, it is designed as a glass wall rather than a concrete wall to look out the window. There is no problem in making a mobile phone call in the vicinity of the glass wall in a building made of glass walls. Repeaters are installed in the shadowed areas that are located underground. In general, antennas are installed on the outer wall of the building and are extended to the shadowed areas using coaxial cables. According to the present invention, however, the terminal is connected only to the macro cell in the link area without the use of a coaxial cable, but wirelessly.

A first service area created by a remote unit 62 in a deeply shaded area, such as the basement of the building, in a building whose front face is made of glass walls suitable for applying the repeater system according to the invention as shown in FIG. 6. The terminal located in 606 communicates with the base station via the remote unit 62 and the donor unit 60, and the terminal located in the radio link area 604 formed by the donor unit 60 is the terminal cell. There is no possibility of malfunction by connecting only to 602.

7 is a block diagram illustrating a structure of a repeater system for a deep shaded area according to another embodiment of the present invention. Referring to FIG. 7, the donor unit 10 and the remote unit 12 described with reference to FIG. 1 may be included and disposed in the first service area 106 to input a signal from the remote unit 12. A second donor unit 706 that shifts the frequency of the input signal by an odd multiple of kHz of +1/2 N and outputs it to the second region 704 defined as the second radio link region, and the second donor unit 706 ) Is spaced apart by a predetermined distance and further shifts the frequency of the signal transmitted by the second donor unit 706 to a raster equal to + 1/2 N kHz or-1/2 N kHz. A second remote relaying to receive a signal shifted by N kHz or a signal of a macro cell frequency at a terminal located within the second service area 708 by sending it to a second service area 708 that is a deeper shaded area than 106. Further comprises a unit 710 It is broken.

The repeater system according to the embodiment may be preferably installed in a building consisting of two underground levels. For example, the remote unit is installed in the upper part of the corridor where people do not pass well, and the service unit is installed in the open part connected from the lower part of the hall to the underground parking lot so that the corridor area becomes the wireless link area.

1 is a block diagram showing the structure of a repeater system for a deep shadow area according to an embodiment of the present invention,

2 is a view for explaining the operation and effect of the repeater system according to the present invention,

3 is a block diagram showing an example of a structure for frequency shifting in a donor unit and a remote unit as a component of a repeater system according to the present invention;

4 is a block diagram showing another example of a structure for frequency shifting in a donor unit and a remote unit as a component of a repeater system according to the present invention;

5 is a block diagram showing another example of a structure for frequency shifting in a donor unit and a remote unit as a component of a repeater system according to the present invention;

6 is a view showing an example of the installation structure of the repeater system according to the present invention, and

7 is a block diagram showing the structure of a repeater system for a deep shadow area according to another embodiment of the present invention.

Claims (3)

A repeater system for signal relay in a shadowed area in a W.D.C. wireless network having a channel raster of positive integer N kHz, A donor unit disposed in the macro cell and inputting a signal from the macro base station to shift the frequency of the input signal by an odd multiple of + 1 / 2N kHz and output it to a first region defined as a radio link region; And A deep shadow is arranged by being spaced apart from the donor unit by shifting the frequency transmitted by the donor unit to a raster equal to odd times kHz of + 1/2 N or odd times kHz of-1/2 N. WU CDMA wireless communication network comprising a; remote unit for transmitting to the first service area which is an area to receive a signal of the center frequency, which is an integer multiple of the positive integer N kHz by the terminal located in the service area; Repeater system for deep shadow areas. The method of claim 1, The donor unit is disposed in the macro cell and inputs a signal from the macro base station, shifts the frequency of the input signal by an odd multiple of + 100 kHz, and outputs it to a first area defined as a radio link area. The remote unit is spaced apart from the donor unit by a predetermined distance, and further shifts the frequency transmitted by the donor unit to a raster of +100 kHz to send the first service area which is a deep shadow area. 1 A repeater system for a shadow area deep in a W.C CD wireless communication network, characterized in that the relay located in the service area to receive a signal of the center frequency that is an integer multiple of 200 kHz. The method of claim 1, A second donor unit disposed in the service area and inputting a signal from the remote unit to shift the frequency of the input signal by an odd multiple of + 1 / 2N kHz to output to a second area defined as a second radio link area; ; And The first service area is further spaced apart from the second donor unit by a predetermined distance and further shifts a frequency of the signal transmitted by the second donor unit to a raster equal to + 1/2 N kHz or-1/2 N kHz. And a second remote unit which transmits a signal shifted by N kHz or a signal of a macro cell frequency to a terminal located in the service area by transmitting to a second service area which is a deeper shadow area. A repeater system for shadow area deep in CDA wireless network.

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