KR20060005918A - Apparatus and its method for generating pseudo pilot pn, and wireless repeating system using that - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a pseudo pilot PN (Pseudo Noise) generating device and a method thereof, a wireless relay system using the same and a computer-readable recording medium recording a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention generates a pseudo pilot PN by determining the position and size of a pilot PN to be inserted into a signal of a base station to be relayed after searching (searching) a pilot PN of various base station signals flowing into a wireless repeater. To provide a pseudo pilot PN generator and a method thereof and a computer readable recording medium having recorded thereon a program for realizing the method.

Another object of the present invention is to provide a wireless relay system for transmitting a pilot PN of a desired base station relatively larger than a pilot PN of another base station among several base station signals relayed through a wireless repeater.

3. Summary of Solution to Invention

The present invention provides a pseudo pilot by determining a position and a size of a pilot PN to be inserted by searching (searching) a pilot PN (Pseudo Noise) of one base station signals branched from an end side in a wireless relay system. Pseudo pilot PN generating means for generating a PN; Receiving means for receiving base station signals coming in through a multipath from a plurality of base stations; Pseudo pilot PN insertion means for inserting a pseudo pilot PN received from the pseudo pilot PN generating means into a base station signal to be relayed among the base station signals received through the receiving means; Relay means for receiving and relaying base station signals inserted with the pseudo pilot PN by the pseudo pilot PN inserting means; Signal branching means for branching the base station signals received from the relaying means and transferring one base station signal to the pseudo pilot PN generating means; And transmitting means for receiving and transmitting (radiating) signals of the base station of the other side to which the pseudo pilot PN is inserted from the signal branching means.

4. Important uses of the invention

The present invention is used in a wireless relay system and the like.

Pilot PN, Pseudo Pilot PN, Insertion Position and Size Determination, Wireless Relay System

Description

Apparatus and its method for generating pseudo pilot PN, and wireless repeating system using that}             

1a to 1d is an exemplary view of a conventional wireless relay system,

2 is a search energy distribution diagram of a pilot PN (Pseudo Noise) on a conventional time axis;

3 is a search energy distribution diagram of a pilot PN (including a pseudo pilot PN) on a time axis according to the present invention;

4 is a configuration diagram of an embodiment of a pseudo pilot PN generating apparatus and a wireless relay system using the same according to the present invention;

5 is a flowchart illustrating an embodiment of a method for generating a pseudo pilot PN according to the present invention.

* Explanation of symbols for the main parts of the drawings

410: receiving antenna 420: first coupler

430: general repeater 440: second coupler                 

450: transmit antenna 460: pseudo pilot PN generator

461: frequency down converter 462: QPSK demodulator

463: searcher 464: pseudo pilot PN generator

465: QPSK Modulator 466: Frequency Upconverter

467: Microprocessor

The present invention relates to a pseudo pilot PN (Pseudo Noise) generating device and a method thereof, a wireless relay system using the same, and a computer-readable recording medium recording a program for realizing the method. Pseudo to solve the decrease of base station capacity due to poor call quality, poor reception condition, and frequent handoff caused by amplifying and relaying signals of several base stations simultaneously through a wireless relay system under The present invention relates to a pilot PN generating device, a method thereof, a wireless relay system using the same, and a computer-readable recording medium storing a program for realizing the method.

In the present invention, the pilot pseudo noise (PN) refers to a short PN code carried on a pilot channel in, for example, a code division multiple access (CDMA) or a wideband code division multiple access (WCDMA) communication scheme. The pilot PN distinguishes a base station on a 64-chip interval basis.

In the present invention, a pseudo pilot PN is not a pilot PN actually searched from a base station signal, but a pilot generated according to the present invention and used in a base station signal to be used as a reference for demodulation and handoff at a terminal side. Say PN.

In the present invention, the wireless relay system refers to a system for relaying a base station signal in a shaded area by receiving a base station signal wirelessly from the base station.

Here, the shaded area means an area where the radio path between the base station and the terminal is cut off. In other words, it refers to an area where radio waves cannot reach by buildings or terrain. In order to solve the shadow area, an additional base station is installed or a relay system is used to design a wireless network.

However, the method of eliminating the local area by expanding the base station is inefficient because it requires a huge investment. Therefore, a relay system that can create high communication quality and service range improvement effect at low cost is widely used. That is, in terms of performance, the base station has a much better characteristic than the relay system, but the base station has a disadvantage that it is more expensive than the relay system. Therefore, it is common to use a relay system to eliminate small shadow areas.

On the other hand, conventional wireless repeaters include a radio frequency (RF) type general repeater, a microwave repeater using a microwave, a small base station, a wireless optical repeater using a wireless optical signal.                         

1A to 1D are exemplary diagrams of a conventional wireless relay system.

First, the general repeater 11 as shown in FIG. 1A receives a radio frequency (RF) signal of a wireless communication band from a mortgage station, amplifies it, and transmits it to a shaded area.

In addition, the microwave repeater 12 as shown in FIG. 1B converts an RF (Radio Frequency) signal into a microwave band frequency signal (8 to 30 GHz band) using a microwave transmitter between the mortgage station and the small cell. To transmit.

In addition, the small base station 13 as shown in FIG. 1C is a miniaturized base station of a wireless communication system.

Finally, the wireless optical repeater as shown in FIG. 1D receives an optical signal from the donor equipment 14 and the donor equipment 14 for converting a radio frequency (RF) signal transmitted from a base station into an optical signal. Coverage equipment 15 for converting and radiating an RF (Radio Frequency) signal.

However, in the conventional wireless relay system as described above, unwanted base station signals are also introduced and amplified together with the base station signal to be relayed and then transmitted to the service area of the wireless relay system. Accordingly, there is a problem that the other base station signal acts as a reception noise to the terminal located in the service area of the wireless relay system.

This phenomenon may cause more serious problems as the interval between base stations becomes narrower as the number of subscribers increases.                         

That is, due to the difficulty of several base station signals flowing into the wireless repeater located in the downtown area where the distance between neighboring base stations is narrow as the number of subscribers is still high, poor reception, poor call quality, And decrease in base station capacity. This is because the handoff request of the terminal frequently occurs according to the change of the signal level of each base station input to the wireless repeater.

The present invention has been proposed to solve the above problems, and after searching (searching) a pilot PN of several base station signals introduced to a wireless repeater, the position and size of a pilot PN to be inserted into a signal of a base station to be relayed are determined. An object of the present invention is to provide a pseudo pilot PN generating apparatus for determining and generating a pseudo pilot PN, and a computer readable recording medium having recorded thereon a method for implementing the method.

Another object of the present invention is to provide a wireless relay system for transmitting a pilot PN of a desired base station relatively larger than a pilot PN of another base station among various base station signals relayed through a wireless repeater.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An apparatus of the present invention for achieving the above object comprises: a pseudo pilot PN generating apparatus comprising: frequency downconverting means for receiving a base station signals to be relayed and frequency downconverting under control of a control means; Demodulation means for demodulating the base station signals down-converted in the frequency down-converting means; Search means for searching (searching) an entire pilot PN of base station signals demodulated by the demodulation means; The control means for determining the position and size of a pilot PN to be inserted by receiving a result of searching (searching) a pilot PN of base station signals in the searching means; Pseudo pilot PN generating means for receiving the position and size of the pilot PN determined by the control means and generating a pseudo pilot PN according thereto; Modulation means for modulating a pseudo pilot PN signal generated by the pseudo pilot PN generating means; And frequency up-converting means for outputting the pseudo pilot PN signal modulated by the modulation means in frequency up-conversion according to the control of the control means and outputting the signal to be inserted into base station signals to be relayed.

In the apparatus of the present invention, the control means receives a result of searching (searching) a pilot PN of base station signals (including a pseudo pilot PN) by the searching means, and a pseudo pilot is inserted. And calculating and adjusting the position and size error of the PN, and transmitting the result to the pseudo pilot PN generating means.

On the other hand, the method of the present invention, the pseudo pilot PN generation method, comprising: selecting a frequency assignment (FA) after initializing the searcher and the pseudo pilot PN generator; Causing the searcher to search (search) the entire pilot PN according to a PN offset value; Determining a position and a size of a pilot PN to be inserted by using a result of searching (searching) a pilot PN at the searcher; And a generating step of transmitting the determined position and size of the pilot PN to the pseudo pilot PN generator to generate a pseudo pilot PN accordingly.

The method may also include searching for (searching) a pilot PN of base station signals (including a pseudo pilot PN) by the searcher; Calculating a position and magnitude error of a pre-inserted pseudo pilot PN using a result of searching (searching) a pilot PN of base station signals (including a pseudo pilot PN) at the searcher; And adjusting the position and size error of the calculated pseudo pilot PN and repeating the operation from the generation step.

On the other hand, the present invention includes a function of selecting a frequency assignment (FA) after initializing the searcher and the pseudo pilot PN generator in the microprocessor to generate a pseudo pilot PN; Allowing the searcher to search (search) all pilot PNs according to PN offset values; Determining a position and a size of a pilot PN to be inserted by using a result of searching (searching) a pilot PN at the searcher; And a computer-readable recording medium having recorded thereon a program for realizing a function of generating the pseudo pilot PN by transmitting the determined position and size of the pilot PN to the pseudo pilot PN generator. .                     

The present invention also provides a function for allowing the searcher to search (search) pilot PNs of base station signals (including pseudo pilot PNs); Calculating a position and magnitude error of a pre-inserted pseudo pilot PN by using a result of searching (searching) a pilot PN of base station signals (including a pseudo pilot PN) at the searcher; And a computer readable recording medium having recorded thereon a program for further realizing the function of repeating from the generation step after adjusting the position and size error of the calculated pseudo pilot PN.

On the other hand, the system of the present invention for achieving the above another object, in the wireless relay system, of the pilot PN to search (search) the pilot PN (Pseudo Noise) of the base station signals branched at the end side (insert) Pseudo pilot PN generating means for determining a location and size to generate a pseudo pilot PN; Receiving means for receiving base station signals coming in through a multipath from a plurality of base stations; Pseudo pilot PN insertion means for inserting a pseudo pilot PN received from the pseudo pilot PN generating means into a base station signal to be relayed among the base station signals received through the receiving means; Relay means for receiving and relaying base station signals inserted with the pseudo pilot PN by the pseudo pilot PN inserting means; Signal branching means for branching the base station signals received from the relaying means and transferring one base station signal to the pseudo pilot PN generating means; And transmission means for receiving and transmitting (radiating) base station signals of the other side to which the pseudo pilot PN is inserted from the signal branching means.                     

In the system of the present invention, the pseudo pilot PN generating means receives the base station signals of one side to which the pseudo pilot PN is inserted from the signal branching means to search (search) the pilot PN of the base station signals. And calculating and adjusting the position and size error of the inserted pseudo pilot PN to generate a pseudo pilot PN and to transmit the pseudo pilot PN to the pseudo pilot PN insertion means.

As described above, the present invention searches for (pilots) a pilot (Pilot) PN which is a reference for demodulation and handoff of a terminal among all base station signals input to the wireless repeater, and then pilots the pilot PN of the base station signal to be serviced by another base station. By sending relatively larger than PN, it prevents poor reception and poor call quality in the standby state, eliminating shadow area caused by PN pollution, and prevents frequent handoff of the terminal in the service area. This can solve the problem of the reduction of the base station capacity.

That is, the present invention searches for (pilots) pilot PNs of various base station signals introduced to a wireless repeater, determines a position and size of a pilot PN to be inserted, generates pseudo pilot PN, and then relays The pilot PN of the determined size is inserted into the determined position within the pilot PN section of the base station, and as a result, the pilot PN of the base station to be relayed is made relatively larger than the pilot PN of other base stations, thereby making it stable in the service area of the wireless repeater. Allows you to build a call processing foundation.                     

In addition, in the present invention, when the capacity of the base station currently being relayed is excessive, the pilot PN of several base station signals flowing into the wireless repeater is searched (searched) to determine the position and size of the newly inserted pilot PN. ) After generating a pilot PN, a pseudo pilot PN generated at the determined size is inserted into the newly determined position in a pilot PN section of a base station to be newly relayed, thereby relaying a service of another neighboring base station without disconnection of a call terminal in service. By switching to, the amount of call between base stations can be distributed.

And, in the process of determining the position and size of the pilot PN to be inserted, the insertion position of the pseudo pilot PN should be inside a region recognized as the same pilot PN as the pilot PN of the base station to be relayed, and the search energy of the pilot PN of another base station Have a relatively large search energy.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a search energy distribution diagram of a pilot PN on a conventional time axis, and FIG. 3 is a search energy distribution diagram of a pilot PN (including a pseudo pilot PN) on a time axis according to the present invention.

In general, a short PN code (pilot PN) carried on a pilot channel in a code division multiple access (CDMA) or a wideband code division multiple access (WCDMA) communication scheme serves to distinguish each base station using a temporal offset.

When the pilot PN is searched among signals flowing into the wireless repeater when there are several base stations around the wireless relay system, the search energy of the pilot PN with respect to the time axis as shown in FIG. Searching energy distribution can be obtained.

At this time, the pilot PN distinguishes the base stations in units of 64 chip sections, and there are several search positions due to multipaths from the base station to the terminal in the 64 chip sections. In FIG. 2, search energies denoted by “201” and “202” denote different base stations, and #N (N is a natural number) denotes the number of signals transmitted from the same base station and subjected to multipath.

On the other hand, when searching for the pilot PN among the signals flowing into the wireless repeater when there are several base stations around the wireless relay system according to the present invention, the search energy of the pilot PN with respect to the time axis as shown in FIG. (searching energy) distribution can be obtained. In this case, search energy represented by "301" and "302" in FIG. 3 means different base stations, and #N (N is a natural number) means the number of signals transmitted from the same base station and subjected to multipath.

In FIG. 3, "303" indicates a pseudo pilot PN that is forcibly inserted into a signal of a base station to be relayed by the pseudo pilot PN generator according to the present invention.

On the other hand, the terminal adopts a lake receiver structure in consideration of the effect of multi-path, which usually includes four fingers (finger). At this time, the multipath signals determined by the searcher as the same base station signal are allocated to the fingers according to their positions, and the higher the search energy is, the higher the priority is assigned.

Therefore, in FIG. 3, the insertion position of the pseudo pilot PN 303 must be in an area recognized as the same pilot PN as the pilot PN of the base station to be relayed, and the size of the pseudo pilot PN 303 is another base station including "302". It should have a relatively large search energy compared to the search energy of the pilot PN of.

4 is a block diagram of an embodiment of a pseudo pilot PN generating apparatus and a wireless relay system using the same according to the present invention.

In the following embodiment, a conventional RF communication repeater (general repeater) and QPSK modulated base station signals are described as an example, but the present invention is not limited thereto.

As shown in FIG. 4, the wireless relay system according to the present invention includes a reception antenna 410, a first coupler 420, a general repeater 430, a second coupler 440, a transmission antenna 450, and a pseudo pilot. PN generator 460 is included.

The receiving antenna 410 is a donor antenna, which receives a base station signal to be relayed from another base station adjacent to the wireless relay system and other unwanted base station signals, and transmits the received base station signal to the first coupler 420. do.

The first coupler 420 receives the pseudo pilot PN generated by the pseudo pilot PN generator 460 and inserts the pseudo pilot PN into a base station signal received through the reception antenna 410. At this time, as the insertion position is generated by the pseudo pilot PN generating device 460 described later, the pseudo pilot PN is inserted into an area recognized as the same pilot PN as the pilot PN of the base station to be relayed. In the present invention, for example, a pseudo pilot PN is inserted at a position about four chips before the first chip among pilot PNs of a base station to be relayed. In an embodiment of the present invention, a case in which the pseudo pilot PN is inserted and coupled to the base station signal using the first coupler 420 is described as an example, but may be implemented using other signal synthesizers.

The general repeater 430 receives the base station signal inserted with the pseudo pilot PN from the first coupler 420 and amplifies the base station signal to the second coupler 440. Here, the general repeater 430 may use any one of various types of wireless repeaters, and the operation at this time is different from the input signal only, and the other operations operate in the same manner as the existing various wireless repeaters. This will not be described in detail any further.

The second coupler 440 branches a signal of a portion of the base station signal amplified by the general repeater 430 to the pseudo pilot PN generator 460, and transmits most other base station signals to the transmission antenna 450. To pass. Here, in an embodiment of the present invention, a case of extracting (branching) a part of signals by coupling a base station signal using the second coupler 440 is described as an example, but other signal splitters, circulators, and the like are described. It can also be implemented.

The transmitting antenna 450 receives the base station signal inserted with the pseudo pilot PN through the second coupler 440 and transmits (radiates) the shadowed area. Accordingly, the searcher of the terminal searches for a pilot PN, which is a criterion for demodulation and handoff of the terminal, and preferentially assigns a signal having a high search energy (signal with a pseudo pilot PN inserted) to the finger. do.

The pseudo pilot PN generating device 460 searches (searches) pilot PNs of various base station signals received through the second coupler 440 to determine the position and size of a pilot PN to be inserted to be pseudo. A pilot PN is generated and delivered to the first coupler 420. At this time, the determined insertion position of the pilot PN should be located in the region recognized as the same pilot PN as the pilot PN of the base station to be relayed (for example, 4 chips before the first chip among the pilot PNs of the base station to be relayed). The size of the determined pilot PN is about 5% to 100% (appropriately about 20%) larger than the largest search energy of the pilot PN of another base station. Here, the size of the pilot PN may have an appropriate value according to the implementation environment.

In addition, the pseudo pilot PN generator 460 searches (searches) and inserts pilot PNs of various base station signals (including the pseudo pilot PN) received through the second coupler 440. A pseudo pilot PN is generated by calculating and adjusting a position and magnitude error of one pseudo pilot PN, and further performing a function of transferring the pseudo pilot PN to the first coupler 420. This is because the pseudo pilot PN is generated at the correct position by generating a pseudo pilot PN such that the pseudo pilot PN is inserted at a position about 4 chips before the first chip among the pilot PNs of the base station to be relayed in consideration of delay and the like. Although this may be inserted, in practice, since the insertion may be offset by about 1 chip, the process of calculating and adjusting the position and size error of the inserted pseudo pilot PN is further performed. In more detail, it is as follows.

First, the insertion position correction will be described.

As described above, the first intended insertion position was 4 chips before the first chip, but when re-searched, it was found that the chip was delayed by one chip from the microprocessor 467 to the pseudo pilot PN generator 464 if it was detected 5 chips before. You will be asked to generate a pilot. On the contrary, before 3 chips, one chip is pulled to generate. On the other hand, even if an error of more than two chips (two to three chips) occurs with respect to the initially inserted position due to other additional problems, the error correction is performed by pushing or pulling by one chip. This is because a situation in which the service does not occur due to the location does not occur as long as the area is recognized as the pilot PN of the same base station.

Next, looking at the size correction, the cause for the size correction can be largely divided into two cases. One is a case where the signal environment flowing into the general repeater 430 is unchanged, but the energy of the pseudo pilot PN inserted according to the present invention is different from the intended, and the second is the energy of the inserted pseudo pilot PN as intended. This is the case where the size needs to be resized due to the change in the signal environment flowing into the general repeater 430. However, when looking at only the search results, it is difficult to distinguish in which case a size error occurs. Therefore, the target search energy of the pseudo pilot PN is determined from the research result (120% larger than other base station PN search energy changed as a result of the initial research), and based on the search energy of the pseudo pilot PN with respect to the current output level. Determine whether to increase or decrease by Here, since the search energy is a power concept, it is proportional to the square of the signal magnitude, and thus, if only the search energy and the target search energy for the current signal magnitude are determined, how much to increase or decrease the signal can be calculated. In addition, the increase and decrease of the signal can be controlled by the digital gain of the pseudo pilot PN generator 464, or by inserting a digital attenuator (not shown) on the external RF circuit. It can also be implemented in parallel. At this time, even when the digital attenuator is used, the control command of the microprocessor 467 is received.

Meanwhile, the pseudo pilot PN generator 460 according to the present invention includes a frequency down converter 461, a quadrature phase shift keying (QPSK) demodulator 462, a searcher 463, a pseudo pilot PN generator 464, and a QPSK modulator ( 465, frequency upconverter 466, and microprocessor 467.

The frequency down converter 461 is a device which performs a general frequency down function, and controls the base station signals (PLL control, etc.) of the microprocessor 467 by branching a part of the output through the second coupler 440. Accordingly, the frequency down-conversion is transmitted to the QPSK demodulator 462. In this case, the frequency down converter 461 down-converts, for example, a high frequency signal of an RF band into an intermediate frequency (IF) band signal to enable signal processing.

The QPSK demodulator 462 is a device that performs a general QPSK demodulation function. The QPSK demodulator 462 performs QPSK demodulation on a number of base station signals down-converted by the frequency down converter 461 and transmits the demodulated signals to the searcher 463.

The searcher 463 is a device for performing a general search function. The searcher 463 searches (searches) the entire pilot PN of several base station signals QPSK demodulated by the QPSK demodulator 462 and transmits the result to the microprocessor 467.

The microprocessor 467 receives a result of searching (searching) a pilot PN of various base station signals at the searcher 463 to determine the position and size of a pilot PN to be inserted, and then the result is a pseudo pilot PN generator. Forward to 464. At this time, the insertion position and size of the determined pilot PN are as described above.

At this time, the microprocessor 467 receives a result of searching (searching) a pilot PN of several base station signals (including a pseudo pilot PN) at the searcher 463 and then inserts a pseudo pilot PN. It further performs the function of calculating and adjusting the position and magnitude error of and transmitting the result to the pseudo pilot PN generator 464. The reason is as described above.

The pseudo pilot PN generator 464 is a device that performs a general PN generation function. The pseudo pilot PN generator 464 receives a position and size of a pilot PN determined by the microprocessor 467 and generates a pseudo pilot PN according to the QPSK modulator. Forward to (465). At this time, the insertion position and the size of the generated pilot PN is as described above.

The QPSK modulator 465 is a device that performs a general QPSK modulation function. The QPSK modulator 465 performs QPSK modulation on the pseudo pilot PN signal generated by the pseudo pilot PN generator 464 and transmits the QPSK modulator to the frequency up-converter 466.

The frequency up-converter 466 is a device that performs a general frequency up-function, and frequency-upconverts a pseudo pilot PN signal QPSK-modulated by the QPSK modulator 465 according to control of a microprocessor 467 (PLL control, etc.). Transfer to the first coupler 420. At this time, the frequency up-converter 466 up-converts, for example, the IF band signal into a high frequency signal of the RF band.

In the above embodiment, the QPSK modulation and demodulation method is described as an example, but in practice, the modulation and demodulation method used for the relayed base station signal may be used.

5 is a flowchart illustrating a method for generating a pseudo pilot PN according to the present invention, and illustrates a process of generating a pseudo pilot PN by adjusting an exact insertion position and size of the pseudo pilot PN.

First, the microprocessor 467 initializes the searcher 463 and the pseudo pilot PN generator 464 (510). The microprocessor 467 selects a frequency assignment (FA) (520).

Thereafter, the microprocessor 467 controls the searcher 463 to search (search) the entire pilot PN according to the PN offset value (530).

Thereafter, the microprocessor 467 receives the result of searching (searching) the pilot PN at the searcher 463 and determines the position and size of the pilot PN to be inserted (540). At this time, the insertion position and size of the determined pilot PN are as described above.

Thereafter, the microprocessor 467 transmits the position and size of the determined pilot PN to the pseudo pilot PN generator 464 to generate a pseudo pilot PN accordingly (550). At this time, the insertion position and the size of the generated pilot PN is as described above.

Thereafter, the microprocessor 467 controls the searcher 463 to search (search) the pilot PN of several base station signals (including the pseudo pilot PN).

Thereafter, the microprocessor 467 receives a result of searching (searching) a pilot PN of several base station signals (including a pseudo pilot PN) at the searcher 463, and then positions and sizes of the pseudo pilot PNs inserted therein. Compute the error (570).

Thereafter, the microprocessor 467 proceeds to the pseudo pilot PN generation process 550 after adjusting the position and size error of the calculated pseudo pilot PN (580).

As such, the microprocessor 467 performs the error correction for the insertion position and the size of the pilot PN determined initially by repeating the above-described processes (550 to 580).                     

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, after searching (searching) a pilot (Pilot) PN that is a reference for demodulation and handoff of the terminal among all the base station signals input to the wireless repeater, the pilot PN of the base station signal to be serviced By transmitting relatively larger than the pilot PN of the base station, it prevents poor reception and poor call quality in the standby state, eliminating the shadow area caused by PN pollution, and the frequent handoff of the terminal in the service area. It is possible to solve the problem of reducing the base station capacity.

That is, the present invention has an effect of establishing a stable call processing base in the service area of the wireless repeater by transmitting a pilot PN of a base station to be relayed relatively larger than that of other base stations.

In addition, the present invention has the effect of distributing the call volume between the base stations by switching to the relay service of another adjacent base station without disconnection of the service terminal when the capacity of the base station currently relay service is excessive.

Claims (15)

In a wireless relay system, Pseudo pilot PN generating means for generating pseudo pilot PN by determining the position and size of pilot PN to be inserted by searching (searching) the pilot PN (Pseudo Noise) of the base station signals branched at the end side ; Receiving means for receiving base station signals coming in through a multipath from a plurality of base stations; Pseudo pilot PN insertion means for inserting a pseudo pilot PN received from the pseudo pilot PN generating means into a base station signal to be relayed among the base station signals received through the receiving means; Relay means for receiving and relaying base station signals inserted with the pseudo pilot PN by the pseudo pilot PN inserting means; Signal branching means for branching the base station signals received from the relaying means and transferring one base station signal to the pseudo pilot PN generating means; And Transmission means for receiving and transmitting (radiating) signals of the base station of the other side to which the pseudo pilot PN is inserted from the signal branching means Wireless relay system comprising a. The method of claim 1, The pseudo pilot PN generating means is By receiving the base station signals of one side into which the pseudo pilot PN is inserted from the signal branching means, the pilot PNs of the base station signals are searched (searched) to calculate and adjust the position and magnitude error of the inserted pseudo pilot PN. And generating a pseudo pilot PN and delivering the pseudo pilot PN to the pseudo pilot PN insertion unit. The method according to claim 1 or 2, The pseudo pilot PN generating means is And a pseudo pilot PN is generated by determining an insertion position of the pseudo pilot PN such that the pseudo pilot PN is inserted into an area recognized as the same pilot PN of the base station to be relayed. The method of claim 3, wherein The pseudo pilot PN generating means is The size of the pseudo pilot PN is determined so that the pilot PN of the base station to be relayed has a larger search energy than the largest search energy of the pilot PN of another base station, thereby generating a pseudo pilot PN of a corresponding size. Wireless relay system. The method of claim 4, wherein The pseudo pilot PN generating means is A frequency down converter for receiving a base station signal branched by the signal branching unit and performing frequency downconversion under the control of a microprocessor; A demodulator for demodulating base station signals down-converted in the frequency down converter; A searcher for searching (searching) an entire pilot PN of the base station signals demodulated by the demodulator; The microprocessor configured to determine the position and size of a pilot PN to be inserted by receiving a result of searching (searching) a pilot PN of base station signals at the searcher; A pseudo pilot PN generator for receiving the position and size of the pilot PN determined by the microprocessor and generating a pseudo pilot PN accordingly; A modulator for modulating a pseudo pilot PN signal generated by the pseudo pilot PN generator; And Frequency up-converter for up-converting the frequency of the pseudo pilot PN signal modulated by the modulator to the pseudo pilot PN insertion unit under control of the microprocessor. Wireless relay system comprising a. In the pseudo pilot PN generator, Frequency downconverting means for receiving the base station signals to be relayed and performing frequency downconversion according to the control of the control means; Demodulation means for demodulating the base station signals down-converted in the frequency down-converting means; Search means for searching (searching) an entire pilot PN of base station signals demodulated by the demodulation means; The control means for determining the position and size of a pilot PN to be inserted by receiving a result of searching (searching) a pilot PN of base station signals in the searching means; Pseudo pilot PN generating means for receiving the position and size of the pilot PN determined by the control means and generating a pseudo pilot PN according thereto; Modulation means for modulating a pseudo pilot PN signal generated by the pseudo pilot PN generating means; And Frequency up-converting means for outputting the pseudo pilot PN signal modulated by the modulation means in frequency up-conversion according to the control of the control means and outputting it to be inserted into base station signals to be relayed. Pseudo pilot PN generating device comprising a. The method of claim 6, The control means, The search means receives a result of searching (searching) a pilot PN of base station signals (including a pseudo pilot PN), and calculates and adjusts the position and magnitude error of the inserted pseudo pilot PN. The pseudo pilot PN generating apparatus further comprises a function of delivering to the pseudo pilot PN generating means. The method according to claim 6 or 7, The control means, The insertion position of the pseudo pilot PN is determined so that the pseudo pilot PN is inserted into the region recognized as the same pilot PN as the pilot PN of the base station to be relayed. The pseudo pilot PN generating means is And a pseudo pilot PN generating device to be inserted at an insertion position determined by the control means. The method of claim 8, The control means, The size of the pseudo pilot PN is determined such that the pilot PN of the base station to be relayed has a larger search energy than the largest search energy of the pilot PN of another base station. The pseudo pilot PN generating means is And a pseudo pilot PN having a size determined by the control means. In the method of generating a pseudo pilot PN, Selecting a Frequency Assignment (FA) after initializing the searcher and pseudo pilot PN generators; Causing the searcher to search (search) the entire pilot PN according to a PN offset value; Determining a position and a size of a pilot PN to be inserted by using a result of searching (searching) a pilot PN at the searcher; And A generation step of transmitting the determined pilot PN to the pseudo pilot PN generator to generate a pseudo pilot PN accordingly; Pseudo pilot PN generation method comprising a. The method of claim 10, Allowing the searcher to search (search) pilot PNs of base station signals (including pseudo pilot PNs); Calculating a position and magnitude error of a pre-inserted pseudo pilot PN using a result of searching (searching) a pilot PN of base station signals (including a pseudo pilot PN) at the searcher; And Repeating from the generation step after adjusting the position and magnitude error of the calculated pseudo pilot PN Pseudo pilot PN generation method further comprising. The method of claim 10 or 11, The insertion position determination process of the pseudo pilot PN, And a method for generating a pseudo pilot PN such that a pseudo pilot PN is inserted so that a pseudo pilot PN is inserted into an area recognized as a pilot PN identical to a pilot PN of a base station to be relayed. The method of claim 12, Determining the size of the pseudo pilot PN, And a method of generating a pseudo pilot PN such that the pilot PN of the base station to be relayed has a larger search energy than the largest search energy of the pilot PN of another base station. To the microprocessor to generate a pseudo pilot PN, Selecting a Frequency Assignment (FA) after initializing the searcher and pseudo pilot PN generators; Allowing the searcher to search (search) all pilot PNs according to PN offset values; Determining a position and a size of a pilot PN to be inserted by using a result of searching (searching) a pilot PN at the searcher; And Generating function for transmitting the determined position and size of the pilot PN to the pseudo pilot PN generator to generate a pseudo pilot PN accordingly. A computer-readable recording medium having recorded thereon a program for realizing this. The method of claim 14, Allowing the searcher to search (search) pilot PNs of base station signals (including pseudo pilot PNs); Calculating a position and magnitude error of a pre-inserted pseudo pilot PN by using a result of searching (searching) a pilot PN of base station signals (including a pseudo pilot PN) at the searcher; And A function of repeating from the generation step after adjusting the position and size error of the calculated pseudo pilot PN A computer-readable recording medium that records a program for further realization.

Images