KR20060047360A - Apparatus and method for processing the signal delay between optic repeater and base-station on tdd system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a signal delay processing apparatus and a method of a base station and a relay period in a time division duplex system.

2. The technical problem to be solved by the invention

The present invention is to overcome the signal delay between the base station and the relay period by using a delay apparatus in a time division duplex (TDD) system, that is, the RF signal transmitted from the base station to the repeater and radiated (sent) by the base station is a predetermined frame. By transmitting the delayed by the delay, the RF signal radiated from the base station and the RF signal passing through the repeater to accurately match the timing synchronization, thereby minimizing the interference of the signal, thereby providing a signal delay processing apparatus and method thereof There is a purpose.

3. Summary of Solution to Invention

A signal delay processing apparatus for a base station and a relay period in a time division duplex (TDD) system, comprising: preprocessing means for preprocessing a base station signal; Distribution means for distributing the base station signal preprocessed by the preprocessing means; Means for transferring the base station signal of one side distributed by the distribution means to an external repeater without delay; Base station signal delay means for delaying the other base station signal distributed by the distribution means by a predetermined frame; And post-processing means for transmitting the base station signal delayed by the base station signal delay means.

4. Important uses of the invention

The present invention is used in time division duplex (TDD) systems and the like.

Time Division Duplexing (TDD), Base Station Signal Delay, Overcoming Signal Delay, Minimizing Signal Interference, Timing Synchronization Match, Optical Repeater

Description

Apparatus and method for processing the signal delay between optic repeater and base-station on TDD system in time division duplex system

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

2 is a configuration diagram of an optical relay system used in a conventional code division multiple access / time division duplex (CDMA / TDD) system.

3 is a configuration diagram of an apparatus for processing a signal delay between a base station and a relay period in a time division duplex (TDD) system according to the present invention;

4 is a flowchart illustrating a signal delay processing method between a base station and a relay period in a time division duplex (TDD) system according to the present invention.

* Explanation of symbols for the main parts of the drawings

30: RF (Radio Frequency) module 31: RF unit

32 PreAmp 33 Splitter

34: external interface connector 35: base station RF signal delay module

36: high power amplifier (HPA) 37: antenna

38: master optical repeater

The present invention relates to an apparatus and a method for processing signal delay between a base station and a relay period in a time division duplex (TDD) system, and more particularly, to use a delay device (eg, a base station RF signal delay module) in a time division duplex (TDD) system. The present invention relates to a signal delay processing apparatus and a method for overcoming a signal delay between a base station and a relay period.

In the following embodiment will be described by taking an optical repeater as an example of the repeater.

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

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 transliteration area through the expansion of the base station is inefficient because it requires a huge investment. Therefore, a relay system that can generate high communication quality and service range improvement 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 RF (Radio Frequency) type general repeater, microwave repeater using microwave, small base station and the like.

1A to 1C 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 (8-30 GHz band) using a microwave transmitter between the mortgage station and the small cell. send.

The small base station 13 shown in Fig. 1C is a miniaturization of a general base station of a wireless communication system.

On the other hand, the optical repeater is a device that is widely used to expand the area that can be serviced by one base station, located in the vicinity of the base station to convert the forward signal transmitted from the base station into an optical signal or to transmit the optical signal transmitted to the base station A master optical repeater for converting a reverse signal, and converts an optical signal from the master optical repeater to a forward high frequency signal at a location far from a base station and transmits it to a terminal or converts a reverse high frequency signal from the terminal to an optical signal It consists of a slave optical repeater to transmit to.

For reference, a code division multiple access / time division duplex (CDMA / TDD) system uses a time division multiplexing (TDD) scheme for dualization and an orthogonal frequency division multiplexing / frequency division multiple access (OFDMA) scheme for multiplexing. First, time division duplexing (TDD) is a bidirectional transmission method in which uplinks and downlinks are alternately assigned in time in the same frequency band, and a base station is divided into time slots. Use a particular frequency channel as only one of the forward and reverse links.

OFDMA (OFDM / FDMA) is a digital modulation scheme for improving transmission rate per bandwidth and preventing multipath interference, such as orthogonal frequency division multiplexing using multiple carriers orthogonal to each other. OFDM is a combination of Orthogonal Frequency Division Multiplexing (FDMA) and Frequency Division Multiple Access (FDMA).

The configuration of the optical relay system will be described in more detail with reference to FIG. 2.

2 is a configuration diagram of an optical relay system used in a conventional code division multiple access / time division duplex (CDMA / TDD) system.

As shown in FIG. 2, a general optical relay system includes a base station controller 21, a base station 22, a master optical repeater 23, and a plurality of slave optical repeaters 24.

The forward signal generated by the base station 22 is converted into an optical signal by the master optical repeater 23 and then transmitted to the slave optical repeater 24 through the optical cable, and the slave optical repeater 24 is the master optical repeater 23. The optical signal from) is converted into a high frequency signal and transmitted to the terminal.

In addition, the reverse signal generated from the terminal is converted into an optical signal by the slave optical repeater 24 and then transmitted to the master optical repeater 23, the master optical repeater 23 receives the optical signal from the slave optical repeater 24 The signal is converted into an appropriate band signal and then transmitted to the base station 22.

Here, the appropriate band is determined by which point of the base station the master optical repeater 23 transmits the reverse signal. In general, the appropriate band is often a medium frequency or a low frequency band rather than a high frequency used in a wireless environment. At this time, the band in which the master optical repeater 23 converts the optical signal is applied regardless of the connection scheme of the base station 22 and the master optical repeater 23.

Meanwhile, in a code division multiple access / time division duplex (CDMA / TDD) system, a general master optical repeater 23 adjusts a gain of a forward signal received from a base station 22 or a gain of a reverse signal received from a terminal. A master gain controller, an optical transceiver for converting a signal processed by the master gain controller into an optical signal, a master control unit (MCU) and a master control unit (MCU) for controlling and supplying power to the above components; MCU) includes a modulator for transmitting and receiving data for monitoring and controlling the slave optical repeater (24).

As such, the master optical repeater 23 is positioned between the base station 22 and the slave optical repeater 24 to relay a signal. That is, as described above, in the optical relay system, the forward signal from the base station 22 and the reverse signal from the terminal are finally transmitted / received through the radio transmitter / receiver RF of the slave repeater 24.

However, in the optical repeater as described above, the signal processing delay problem and the optical fiber delay problem are inevitable due to the characteristics of the optical path.

On the other hand, in the conventional code division multiple access / frequency division duplex (CDMA / FDD) system, since the link is separated using frequency, there is no problem about delay. However, in a system using time division duplex (TDD) for link division, there is a problem that the delay of the repeater acts as a very large interference.

That is, the code division multiple access / time division duplex (CDMA / TDD) system uses a time division multiplexing (TDD) scheme for dualization and OFDMA for multiplexing, and thus uses the same frequency in both forward and reverse directions, and uses a link as time division. Separate Therefore, the switching synchronization between the repeater (master optical repeater 23 and slave optical repeater 24) and the base station 22 is very important. If the synchronization is not exactly matched, there is a problem that the interference caused by this is very large. Due to the signal interference at the cell boundary due to the delay of the time division duplexing (TDD) optical relay system, the signal quality is deteriorated and thus the service quality is deteriorated.

The present invention has been proposed to solve the above problems, and an object thereof is to provide a signal delay processing apparatus and a method for overcoming a signal delay between a base station and a relay period using a delay apparatus in a time division duplex (TDD) system. .

That is, the present invention transmits the signal from the base station to the repeater immediately, and the RF signal radiated from the base station is transmitted by delaying a predetermined frame so that the RF signal radiated from the base station and the RF signal passing through the repeater are accurately synchronized. It is an object of the present invention to provide an apparatus and a method for processing a signal delay, in which N s are matched and thus interference of a signal is minimized.

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 signal delay processing apparatus of a base station and a relay period in a time division duplex (TDD) system, comprising: preprocessing means for preprocessing a base station signal; Distribution means for distributing the base station signal preprocessed by the preprocessing means; Means for transferring the base station signal of one side distributed by the distribution means to an external repeater without delay; Base station signal delay means for delaying the other base station signal distributed by the distribution means by a predetermined frame; And post-processing means for transmitting the base station signal delayed by the base station signal delay means.

On the other hand, the method of the present invention, the signal delay processing method of the relay station and the base station in a time division duplex (TDD) system, the pre-processing step of pre-processing the base station signal; A distribution step of distributing a base station signal preprocessed in the preprocessing step; Transmitting a base station signal of one side distributed in the distribution step to an external repeater without delay; A base station signal delay step of delaying another base station signal distributed in the distribution step by a predetermined frame; And a post-processing step of transmitting the base station signal delayed in the base station signal delay step.

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.

3 is a block diagram of a signal delay processing apparatus of a base station and a relay period in a time division duplex (TDD) system according to the present invention, in which "30" is an RF (Radio Frequency) module and "31" is an RF unit. "32" is preamplifier, "33" is splitter, "34" is external interface connector, "35" is base station RF signal delay module, "36" is high power amplifier (HPA), "37" is antenna, "38" Each represents a master optical repeater.

As shown in FIG. 3, in the time division duplex (TDD) system according to the present invention, a signal delay processing apparatus of a base station and a relay period includes an RF unit 31 for processing a base station signal (RF), and the RF The preamplifier 32 for amplifying the base station signal subjected to the RF processing by the unit 31 and the base station signal amplified by the preamplifier 32 are distributed at an appropriate ratio (for example, 5 to 5). A distributor 33 for directly transmitting the base station signal of one side to the external master optical repeater 38 without delay, and delaying the base station signal of the other side distributed by the distributor 33 by a predetermined frame (for example, one frame). A high power amplifier (HPA) for amplifying the base station RF signal delayed by the base station RF signal delay module 35 and the base station RF signal delayed by the base station at high power to be transmitted (emitted) through the antenna 37 ( 36).

At this time, in the embodiment, the base station RF signal delay module 35 is connected to the distributor 33 and the high power amplifier 36 through the first and second external interface connectors 34, and an external master optical repeater. Although the case in which the 38 is connected to the distributor 33 through another external interface connector 34 is described, according to an implementation scheme, the base station RF signal delay module 35 is not connected to the distributor 33 via the external interface connector 34. It may be implemented in various ways, such as directly mounted in the (30).

In addition, in one embodiment, the splitter 33 is interlocked immediately after the preamp 32 and the base station RF signal delay module 35 and the external master optical repeater 38 are connected to the splitter 33. Although the interlocking case is described, the distributor 33, the base station RF signal delay module 35, and the external master optical repeater 38 may be connected to the high power amplifier 36 if the efficiency of the high power amplifier 36 is slightly reduced. It can also be placed at the rear end. Of course, at this time, the distribution ratio is different from the above embodiment. For example, the distribution ratio of the base station RF signal delay module 35: the external master optical repeater 38 may be 8: 2.

In addition, the degree of delaying the base station signal in the base station RF signal delay module 35 may be determined in consideration of the processing delay of the master optical repeater 38 which is actually implemented and interworked, and the delay of the optical path actually used in the implementation.

4 is a flowchart illustrating a signal delay processing method between a base station and a relay period in a time division duplex (TDD) system according to the present invention.

First, the base station signal is subjected to RF (Radio Frequency) processing (41). Thereafter, the RF-processed base station signal is amplified (42).

Thereafter, the amplified base station signal is distributed at an appropriate ratio (for example, 5 to 5) (43).

Thereafter, the base station signal of one side of the distributed base station signal is transferred to the external master optical repeater 38 without delay (44).

In addition, after delaying the base station signal of the other side of the distributed base station signal by a predetermined frame (for example, one frame) (45), the delayed base station RF signal is amplified with high power and transmitted through the antenna 37 (radiation). (46).

In general, timing synchronization can be achieved by delaying one frame for frame synchronization in processing delay and optical path delay of the optical repeater. In this case, however, switching timing synchronization is ensured, but signal interference at the cell boundary is maximized. Therefore, in the present invention, as described above, the signal from the base station to the master optical repeater is directly transmitted without delay, and the base station RF signal transmitted from the base station is delayed for a predetermined frame so that the base station RF signal and the RF signal passing through the optical repeater are accurately Not only do the timings match, but the interference of the signal can be minimized.

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.

As described above, the present invention has an effect of overcoming signal delay between the base station and the relay period by simply using a delay apparatus in a time division duplex (TDD) system.

That is, the present invention transmits the signal from the base station to the repeater immediately, and the RF signal radiated (sent) from the base station is transmitted by delaying a predetermined frame (for example, 1 frame), thereby passing the RF signal radiated from the base station and the repeater. It is possible to ensure that the timing of the RF signal is exactly synchronized, thereby minimizing the interference of the signal.

In addition, the present invention can improve the signal quality by minimizing the signal interference at the cell boundary due to the signal delay of the time division duplexing (TDD) optical relay system, thereby significantly improving the quality of service.

Claims (7)

In the signal delay processing apparatus of the base station and the relay period in a time division duplex (TDD) system, Preprocessing means for preprocessing a base station signal; Distribution means for distributing the base station signal preprocessed by the preprocessing means; Means for transferring the base station signal of one side distributed by the distribution means to an external repeater without delay; Base station signal delay means for delaying the other base station signal distributed by the distribution means by a predetermined frame; And Post-processing means for transmitting the base station signal delayed by the base station signal delay means Signal delay processing apparatus of the base station and the relay period in a time division duplex (TDD) system comprising a. The method of claim 1, The base station signal delay means, The signal delay processing apparatus of the base station and the relay period in the time division duplexing (TDD) system, characterized in that for delaying the base station signal by a delay time determined in consideration of the processing delay and the optical path delay in the external repeater. The method according to claim 1 or 2, The pretreatment means, An RF unit for processing a base station signal (Radio Frequency); And A preamplifier (PreAmp) for amplifying a base station signal processed by the RF unit and outputting the amplified base station signal to the distribution means, The post-processing means, And a high power amplifier for amplifying the base station signal delayed by the base station signal delay unit at high power to be transmitted (emitted) through an antenna, wherein the signal delay processing apparatus of the base station and the relay period in the time division duplexing (TDD) system . The method of claim 3, wherein The base station signal delay means, The signal delay processing apparatus of the base station and the relay period in a time division duplexing (TDD) system, characterized in that connected to the distribution means and the high power amplifier, respectively, via first and second external interface connectors. A signal delay processing method of a relay station and a base station in a time division duplex (TDD) system, A preprocessing step of preprocessing the base station signal; A distribution step of distributing a base station signal preprocessed in the preprocessing step; Transmitting a base station signal of one side distributed in the distribution step to an external repeater without delay; A base station signal delay step of delaying another base station signal distributed in the distribution step by a predetermined frame; And Post-processing step of transmitting the base station signal delayed in the base station signal delay step Signal delay processing method of the base station and the relay period in a time division duplex (TDD) system comprising a. The method of claim 5, wherein The base station signal delay step, And delaying the base station signal by a delay time determined in consideration of the processing delay and the optical path delay in the external repeater. The method according to claim 5 or 6, The pretreatment step, RF (Radio Frequency) processing of the base station signal; And Amplifying the base station signal processed by the RF; The post-treatment step, And amplifying the base station signal delayed in the base station signal delay step at high power and transmitting the same through an antenna. 2. The signal delay processing method of a base station and a relay period in a time division duplexing (TDD) system.

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