KR20060034937A - Apparatus generating synchronizing signal between base station and repeaters in the high-speed packet transmission system and method thereof - Google Patents

Abstract

The present invention discloses a synchronization signal supply apparatus and a method between a base station and a relay station in a high speed packet transmission system.

According to the present invention, an apparatus for supplying a synchronization signal to each relay station in a high-speed packet transmission mobile communication system including a plurality of relay stations connected to a central base station via a wireless transmission network, is provided in the base station, GPS (Global Position System) A reference frequency transmitting means for transmitting the reference frequency signal for synchronization of each relay station generated using the reference frequency tone received through the receiver to the relay station and the relay station, and outputs the reference frequency transmitting means received through the transmission network. Distribution, demodulating the reference frequency signal, correcting the phase of the demodulated signal, and providing the reference frequency signal as a reference frequency signal of each functional unit, to each relay station miniaturized in a wireless system based on high-speed packet data transmission. Synchronous information can be delivered efficiently, allowing flexible movement between relay stations The signal quality can be improved and the relay station can be miniaturized because it does not have to have a GPS receiver in each station, thus eliminating obstacles caused by the position selection of the relay station, and effectively eliminating the shadow area by minimizing the relay station. In addition, it has the effect of improving the optimal data quality and increasing the capacity of subscribers, and reducing the installation and management costs.

Description

Apparatus generating synchronizing signal between base station and repeaters in the high-speed packet transmission system and method according to the present invention.

1 is a schematic diagram of a high speed packet transmission system to which the present invention is applied.

2A and 2B are block diagrams of an entire synchronization signal supply apparatus according to the present invention.

3 is a detailed block diagram of a reference frequency generator according to the present invention.

4 is a detailed block diagram of a reference frequency receiver according to the present invention;

* Explanation of symbols for the main parts of the drawings

101: base station 102: base station antenna

103: relay station antenna 104: relay station

105: digital unit 106: transfer unit

201: reference frequency generator 202: modulator and upconverter

203,214: Bandpass filter 204,211: Power synthesizer

205,210,215,216: Amplifier 206,209: Duplexer

301: Splitter 302: Upconverter

The present invention relates to a synchronization signal supply apparatus and method thereof in a high-speed packet transmission system. More particularly, the present invention relates to a synchronization signal supply apparatus and a method for transmitting the frequency-modulated signal based on a transmission method using a radio signal to a relay station. It relates to a method of correcting phase.

In the conventional base station system, a synchronization signal requiring synchronization is not separately transmitted to the relay station, but a method of correcting the phase of the reference frequency of the base station by using a frequency correction device inside the terminal is applied. This is not an issue because signal disconnection and voice change are subtle in the low packet method, and it is not a big problem. However, in a high-speed packet transmission system, even a short time signal disconnection cannot be ignored in terms of packet amount. This can lead to degradation of system performance and capacity.

The technical problem to be achieved by the present invention, in order to solve the above problems, by providing a reference frequency and time synchronization information from the base station of the high-speed packet transmission system to each relay station, it is possible to efficiently synchronize the relay station, Accordingly, an object of the present invention is to provide a synchronization signal supply device and a method thereof in a high speed packet transmission system capable of improving the capacity and performance of an entire system.

An apparatus for providing a synchronization signal between a base station and a relay station in a high speed packet transmission system according to the present invention for solving the above technical problem is provided in a high speed packet transmission mobile communication system including a plurality of relay stations connected through a wireless transmission network with a central base station. An apparatus for supplying a synchronization signal to each relay station, the apparatus comprising: a reference frequency signal for synchronization of each relay station provided in the base station and generated using a reference frequency tone received through a GPS (Global Position System) receiver; Reference frequency transmitting means for transmitting to the relay station; And a distribution unit provided at the relay station, to distribute the output of the reference frequency transmitting means received through the transmission network, to demodulate the reference frequency signal, to correct the phase of the demodulated signal, and to provide the reference frequency signal of each functional unit. Reference frequency receiving means; characterized in that it comprises a.

The reference frequency transmitting means comprises: reference frequency generating means for generating a reference frequency for synchronization of the relay station using the reference frequency tone received through the GPS receiver; Power synthesizing means for synthesizing the reference frequency generated by the reference frequency generating means with existing data; And a transmitting means for amplifying the output of the power synthesizing means, and then converting the power synthesizing means into a wireless signal.

At this time, the reference frequency generating means, the first distribution means for distributing the signal received through the GPS receiver; Distribution and amplifying means for amplifying by distributing one output of the first distribution means into a plurality of signals; First band filtering means for band filtering the other output of the first distribution means; And variable attenuation means for adjusting an output level of a signal input from the first band filtering means.

In this case, the reference frequency generating means receives the other output of the first distribution means and generates a phase-locked reference frequency signal having a band different from the input reference frequency to the first band filtering means. It may further include a; providing a first phase locked loop.

The reference frequency receiving means includes: first amplifying means for amplifying a signal received through the wireless network; First power distribution means for distributing the output of the first amplification means into a plurality of signals; Second band filtering means for extracting a reference frequency signal by filtering the output of the first frequency distribution means; A second phase locked loop for correcting the output phase of the second band filtering means; And second power distribution means for distributing the output of the second phase locked loop into a plurality of signals.

In this case, the reference frequency receiving means may further include a second amplifying means for adjusting and amplifying a gain of the output of the second band filtering means, and the reference frequency receiving means may further include: It may further include a dispensing means for dispensing the output.

In this case, the reference frequency receiving means may further include a third phase locked loop which receives the output of the second power distribution means and provides a phase-fixed reference frequency signal.

In accordance with another aspect of the present invention, a method for providing a synchronization signal between a base station and a relay station in a high speed packet transmission system is applied to a high speed packet transmission wireless network system including a plurality of relay stations connected through a wireless network. A method for providing a synchronization signal to each relay station, the method comprising: a first step of generating a reference frequency signal for synchronization of each relay station using a reference frequency tone received through a GPS (Global Position System) receiver; A second step of synthesizing the generated reference frequency signal with a signal transmitted to the RS; Extracting the reference frequency signal from the transmitted signal; And a fourth step of correcting a phase of the demodulated reference frequency signal to provide a reference frequency signal.

In the present invention, by using a 10MHz reference frequency signal processed and output from a GPS receiver installed in a conventional base station system, FM modulation is used to transmit a frequency to be used as a reference frequency, and the relay station uses the reference frequency signal to synthesize a frequency synthesizer. Synchronize the frequency generated by At this time, the reference frequency signal to be transmitted is selected as a frequency that is not affected by the distortion by the data signal transmitted together. That is, the reference frequency signal is determined by avoiding the frequency represented by the third order nonlinear distortion of the carrier wave being transmitted.

In this way, by transmitting the reference frequency to the relay station, the frequency synchronization and timing synchronization of the entire system can be maintained, thereby allowing the movement between the relay stations flexibly and miniaturization of the relay station can be achieved. Can improve the quality of service.

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

1 is a schematic configuration of a high speed packet transmission system to which the present invention is applied, in which, reference numeral 101 is a base station, 102 is a base station antenna, 103 is a relay station antenna, 104 is a relay station, 105 is a digital unit (DU), and 106 is a transmission unit. TU and 107 denote GPS antennas, respectively.

The transmitting unit (TU) 106 of the base station transmits data and synchronization signals to the relay station 104 using the base station antenna 102, and the relay station 104 is included in the radio signal received using the relay station antenna 103. Demodulated synchronization signal is used as internal reference signal.

2A and 2B are block diagrams of an entire synchronization signal supply apparatus according to the present invention, in which 201 is a reference frequency generator, 202 is a modulator and an up-converter, and 203, 214 are band pass filters (BPF), 204, 211 is a power synthesizer, 205, 210, 215, 216 is an amplifier, 206, 209 is a duplexer, 207 is a base station antenna, 208 is a relay antenna, 212 is a downconverter and demodulator, 213 is a phase locked loop (PLL) ).

The synchronization signal supply apparatus according to the present invention is provided in part in the base station transmission unit (106 in Fig. 1) and the relay station (104 in Fig. 1).

The 10 MHz reference frequency tone output from the digital unit 105 is input to the reference frequency generator 201. The reference frequency generator 201 frequency modulates the reference frequency for synchronization by the system using the 10 MHz reference tone. The frequency-modulated signal is up-converted using the up-converter 202 up to a frequency to be used between the base station 101 and the relay station 104, and a band filter 203 is used to remove harmonic components. Like the packet data of the base station 101, the power synthesizer 204 is synthesized into one signal. The synthesized signal is amplified by the amplifier 205 and then passed through the duplexer 206 and radiated through the base station antenna 207.

The radio signal transmitted from the base station 101 is introduced into the duplexer 209 through the antenna 208 of the relay station and amplified by the amplifier 210. The signal amplified by the amplifier 210 is divided into a plurality of signals to extract the packet data signal and the reference frequency signal through the power divider 211. The down-converter 212 demodulates the reference frequency signal from the down-converted signal, and phase-corrects again through the phase-locked loop 213 to be input to the frequency synchronizer through the band pass filter 214. This reference frequency is input to the frequency synthesizer of the up-converter and down-converter, which will operate the packet data during modulation and demodulation, and is used as the reference frequency.

FIG. 3 is a detailed block diagram of the reference frequency generator of FIG. 2A, where 301 is a divider, 302 is a modulator and an up-converter, 303 is a band pass filter, and 304 is a variable attenuator.

The divider 301 receives a reference frequency of 10 MHz and distributes it, one for the 10 MHz reference frequency used in the transmission unit (Fig. 1 106). In addition, the other 10 MHz reference frequency distributed by the distributor 301 is up-converted to a frequency adjacent to the transmission / reception frequency between the base station 101 and the relay station 104 via the modulator and the up-converter 302, In order to reduce the noise, the output is passed through the band pass filter 303, and a variable amplifier 304 that is variable to adjust the signal strength is used.

FIG. 4 is a detailed block diagram of the reference frequency receiver according to the present invention, and shows only the reference frequency receiver at the front end of the small base station of FIG. 2A in detail. In the figure, 401 denotes a divider, 402 denotes a variable amplifier, 403 denotes a down-converter and a demodulator, 404 denotes a phase locked loop, and 405 denotes a bandpass filter.

The divider 401 distributes the radio signal received through the antenna of the relay station into a packet data signal and a frequency modulated signal, and the signal strength capable of demodulating the down-converted signal using the variable amplifier 402 to increase or decrease the signal. The down converter 403 performs down conversion to demodulate the synchronization signal in the demodulator. This synchronization signal is changed into a reference frequency signal which is phase locked by the phase lock loop 404. The phase-locked loop 404 is used to synchronize 10MHz with the input signal of 10MHz again, and is otherwise necessary to improve the phase noise of the signal. The output of the phase locked loop is suppressed and output from spurious and harmonics through the band pass filter 405 in order not to affect the entire system.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, conversions, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

In addition, it can be easily understood by those skilled in the art that each of the above steps according to the present invention can be variously implemented in software or hardware using a general programming technique.

And some steps of the invention may also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, CD-RW, magnetic tape, floppy disks, HDDs, optical disks, magneto-optical storage devices, and carrier wave (eg, Internet It also includes the implementation in the form of). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

According to the present invention, an apparatus for supplying a synchronization signal to each relay station in a high-speed packet transmission mobile communication system including a plurality of relay stations connected to a central base station via a wireless transmission network, is provided in the base station, GPS (Global Position System) A reference frequency transmitting means for transmitting the reference frequency signal for synchronization of each relay station generated using the reference frequency tone received through the receiver to the relay station and the relay station, and outputs the reference frequency transmitting means received through the transmission network. Distribution, demodulating the reference frequency signal, correcting the phase of the demodulated signal, and providing the reference frequency signal as a reference frequency signal of each functional unit, to each relay station miniaturized in a wireless system based on high-speed packet data transmission. Synchronous information can be delivered efficiently, allowing flexible movement between relay stations Signal quality can be improved, and relay stations can be miniaturized by not having GPS receivers in each station, thus eliminating obstacles due to relay station positioning, and minimizing relay stations can effectively eliminate shadow areas. In addition, it has the effect of improving the optimal data quality and increasing the capacity of subscribers, and reducing the installation and management costs.

Claims (5)

An apparatus for supplying a synchronization signal to each relay station in a high speed packet transmission mobile communication system including a plurality of relay stations connected to a central base station through a wireless transmission network. Reference frequency transmitting means which is provided in the base station and transmits a reference frequency signal for synchronization of each relay station generated using a reference frequency tone received through a GPS (Global Position System) receiver to the relay station; And The relay station is provided, and distributes the output of the reference frequency transmitting means received through the transmission network, demodulates the reference frequency signal, corrects the phase of the demodulated signal, and provides it as a reference frequency signal of each functional unit. Reference frequency receiving means; synchronization signal supply apparatus between the base station and the relay station in a high-speed packet transmission system comprising a. The method of claim 1, The reference frequency transmitting means, Reference frequency generating means for generating a reference frequency for synchronization of the relay station by using the reference frequency tone received through the GPS receiver; Power synthesizing means for synthesizing the reference frequency generated by the reference frequency generating means with existing data; And And a transmitting means for amplifying the output of the power synthesizing means, and then converting the power synthesizing means into a wireless signal and transmitting the converted signal to the base station and the relay station in the high speed packet transmission system. The method of claim 2, The reference frequency generating means, First distributing means for distributing a signal received through the GPS receiver; Distribution and amplifying means for amplifying by distributing one output of the first distribution means into a plurality of signals; First band filtering means for band filtering the other output of the first distribution means; And And variable attenuating means for adjusting an output level of a signal input from the first band filtering means. The method of claim 2, The reference frequency receiving means, First amplifying means for amplifying a signal received through the wireless network; First power distribution means for distributing the output of the first amplification means into a plurality of signals; Second band filtering means for extracting a reference frequency signal by filtering the output of the first frequency distribution means; A second phase locked loop for correcting the output phase of the second band filtering means; And And second power distribution means for distributing the output of the second phase locked loop into a plurality of signals. A method for providing a synchronization signal to each relay station applied to a high speed packet transmission wireless network system including a plurality of relay stations connected to a base station through a wireless network, Generating a reference frequency signal for synchronization of each RS using reference frequency tones received through a GPS (Global Position System) receiver; A second step of synthesizing the generated reference frequency signal with a signal transmitted to the RS; Extracting the reference frequency signal from the transmitted signal; And And a fourth step of correcting a phase of the demodulated reference frequency signal and providing the reference frequency signal as a reference frequency signal.

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