KR100837075B1 - Method for operating repeater of td-scdma system - Google Patents

Abstract

A method for operating a TD-SCDMA(Time Division-Synchronous Code Division Multiple Access) system is provided to reduce costs for establishing a network and improve quality by using a repeater by preventing confusion of repeater radio channel estimation. A repeater receives an emitted signal from a mobile terminal located in an area where radio channels of a base station and the repeater are simultaneously received(S100). The repeater extracts a pilot signal by sampling the emitted signal from the mobile terminal(S200). The repeater transmits the pilot signal of the mobile terminal to the base station via a relay line connected by a fixed line with the base station(S300). The base station receives the pilot signal and analyzes a radio channel of the emitted signal which has been received via the repeater(S400).

Description

Repeater operation method of TD-SCDMA system {METHOD FOR OPERATING REPEATER OF TD-SCDMA SYSTEM}

The following drawings, which are attached in this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a view for explaining a repeater operating method of a TD-SCDMA system according to a first embodiment of the present invention.

2 is a view for explaining a repeater operating method of a TD-SCDMA system according to a second embodiment of the present invention;

3 is a view for explaining a repeater operating method of a TD-SCDMA system according to a third embodiment of the present invention;

<Description of Symbols for Main Parts of Drawings>

100: base station

200: repeater

300: mobile terminal

400: relay line

The present invention relates to a time division-code division multiple access (TD-SCDMA) system, and more particularly, to a base station in a TD-SCDMA system using a joint detection technique. The present invention relates to a repeater operating method of a TD-SCDMA system for operating an outdoor repeater normally in a mixed region of repeaters and repeaters.

In general, the TD-SCDMA system has three major characteristics compared to the WCDMA and CDMA 2000 systems in the frequency division duplex mode.

First, it is suitable for asymmetric services. Since the frequency division duplex scheme employed by the WCDMA and CDMA 2000 systems allocates a fixed frequency band for forward / reverse data transmission, the mobile Internet has asymmetric data traffic between forward and reverse directions. Wireless resources cannot be used efficiently when providing services such as However, since the TD-SCDMA technology controls the forward and reverse slot units, the number of forward and reverse transmission slots can be adaptively adjusted according to the amount of traffic, which is effective for asymmetric data transmission.

In addition, the second feature is that it is easy to change from the existing second generation mobile communication system to the third generation mobile communication system. The TD-SCDMA standard has a 1.6 MHz carrier band, allowing for the addition of TD-CDMA systems to second-generation mobile networks such as GSM and IS-95 for band use and wireless network design, reducing initial investment and ensuring stability. can do.

In addition, the third characteristic is that the frequency efficiency is improved by introducing a joint detection technique, a precise forward synchronization technique of the terminal, a smart antenna, and dynamic channel allocation. In practice, smart antenna technology has been considered to be introduced in other 3G mobile communication systems, and thus it may be difficult to consider it as an advantage of TD-SCDMA, but combined detection and terminal synchronization are considered unique technologies of TD-SCDMA.

In connection with the third feature of TD-SCDMA described above, the TD-SCDMA communication method currently being promoted in China uses a joint detection technique as described above as a reception technique. It uses a code division scheme like the CDMA technique used in Korea, but additionally estimates the radio channel state between the base station and the terminal to remove signals from other base stations and other terminals, thereby reducing the signal-to-noise The core of the technology is to significantly improve the S / N ratio.

However, this technology assumes only base stations installed outdoors. More specifically, only base station signals are used when outdoor repeaters (optical, RF, microwave, laser, etc.) are installed in addition to the base stations installed outdoors. An area that receives a repeater signal at the same time occurs. Accordingly, in a region where the base station and the repeater are mixed, the state of the radio channel is different from the case where the base station is installed outdoors, thereby causing confusion during channel estimation and reducing the reception performance of the radio channel such as reducing the S / N ratio. There is a problem.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is more particularly in a TD-SCDMA system using a joint detection technique in an outdoor area in which a base station and a repeater are mixed. In order to operate a type repeater normally, the repeater is a radio of the base station and the repeater in a time division-synchronous code division multiple access (TD-SCDMA) system in a mixed base station and repeater region. Receiving a radiation signal from a mobile terminal located in an area where a channel is simultaneously received; extracting a pilot signal by sampling the radiation signal from the mobile terminal; A pilot scene of the extracted mobile terminal through a relay line connected to each other by wire Transmitting a call to the base station; estimating a radio channel state between a base station and a mobile terminal, including receiving a pilot signal of the extracted mobile terminal and analyzing a radio channel of a radiation signal through the repeater The present invention provides a method of operating a repeater of TD-SCDMA to significantly improve the signal-to-noise (S / N) ratio by removing signals from other base stations and other mobile terminals, and estimating radio channel conditions between repeaters and mobile terminals.

In accordance with an aspect of the present invention, a method for operating a repeater of a complex time division-code division multiple access (TD-SCDMA) system in a mixed area of a base station and a repeater is provided. The method includes: a) the repeater receiving a radiation signal from a mobile terminal located in an area in which the radio channels of the base station and the repeater are simultaneously received; b) sampling, by the repeater, a radiation signal from the mobile terminal to extract a pilot signal; c) transmitting, by the repeater, the pilot signal of the extracted mobile terminal to the base station through a relay line connected to the base station by wire; And d) receiving, by the base station, the pilot signal of the extracted mobile terminal and analyzing a radio channel of the radiated signal through the repeater.

In the above configuration, step d), the base station samples the radiation signal from the mobile terminal received separately, and analyzes the pilot signal, and receives the pilot signal sampled through the repeater and the base station through each of the sampled pilot signal It is characterized by performing joint detection in consideration of the channel and the repeater channel.

According to another aspect of the present invention, there is provided a repeater operating method of a TD-SCDMA system in a region where a base station and a repeater are mixed: a) wherein the repeater is a region in which radio channels of the base station and repeater are simultaneously received; Receiving a radiation signal from a mobile terminal located at; b) the repeater transmitting the received radiation signal to the base station through a relay line connected to the base station by wire; And c) the base station receives the radiation signal from the mobile terminal separately received and the radiation signal transmitted to the repeater through the relay line, and samples each radiation signal to perform combined detection considering the base station channel and the repeater channel. Steps to perform; characterized in that it comprises a.

In the above configuration, step b) is characterized in that the repeater transmits the received radiation signal as an analog signal or a digital signal through a relay line connected to the base station by wire.

According to yet another aspect of the present invention, there is provided a repeater operating method of a TD-SCDMA system in a region where a base station and a repeater are mixed: a) wherein the repeater is simultaneously receiving radio channels of the base station and repeater; Receiving a radiation signal from a mobile terminal located in an area; b) the repeater transmitting the received radiation signal to the base station through a relay line connected to the base station by wire; c) the base station receiving the radiation signal from the mobile terminal separately received and the radiation signal transmitted to the repeater through the relay line and collecting each radiation signal; And d) the base station sampling the collected radiated signals to perform joint detection considering the base station channel and the repeater channel.

In the above configuration, the step b), the repeater operation method of TD-SCDMA repeater, characterized in that for transmitting the received radiation signal as an analog signal or a digital signal through a relay line connected to the base station wired to each other.

(Example)

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

FIG. 1 is a diagram illustrating a relay operating method of a time division-synchronous code division multiple access (TD-SCDMA) system according to a first embodiment of the present invention.

As shown in FIG. 1, a base station 100 and a repeater 200 are mixed in an area to which a repeater operating method according to the present invention is applied, and wireless channels of the base station 100 and the repeater 200 coexist in the area. Done. Accordingly, the mobile terminal 300 located in the corresponding area simultaneously receives the radio channel of the base station 100 and the radio channel of the repeater 200. For reference, the repeater 200 applied to the present invention refers to an outdoor repeater.

As described above, the base station and the repeater look at the repeater operating method according to the first embodiment of the present invention in such an area as follows.

First, the repeater 200 receives a radiation signal from the mobile terminal 300 located in an area where the radio channels of the base station 100 and the repeater 220 are simultaneously received (S100).

Subsequently, the repeater 200 receiving the radiation signal from the mobile terminal 300 transmits the radiation through an over-head signal, preferably digital sampling, from the radiation signal through signal analysis. A pilot signal from which the high frequency is removed from the signal is extracted (S200).

Then, the repeater 200 transmits the extracted pilot signal of the mobile terminal to the base station through the relay line 400 connected to the base station 100 in a wired manner with each other (S300).

Thereafter, the base station 100 receives the pilot signal extracted from the repeater 200 and analyzes the radio channel of the radiation signal through the repeater (S400). Preferably, the base station 100 receives the radiation signal from the mobile terminal through the radio channel of the base station 100 separately from the reception of the radiation signal from the mobile terminal 300 in the repeater 200 to perform signal analysis. Extract the pilot signal through. Thereafter, the base station 100 receives the pilot signal extracted through the relay line 400 and performs joint detection considering the base station channel and the repeater channel together with the pilot signal analyzed by the base station. That is, the base station 100 estimates the radio channel state between the base station 100 and the mobile terminal 300 to remove signals of other base stations and other mobile terminals, and also the radio channel between the repeater 200 and the mobile terminal 300. By estimating the state, the signal-to-noise ratio is significantly improved.

Next, a repeater operating method of a TD-SCDMA system according to a second embodiment of the present invention will be described with reference to FIG. 2.

Basically, in the method of operating a repeater of the TD-SCDMA system according to the second embodiment of the present invention, the base station 100 and the repeater 200 are mixed in a corresponding region as in the first embodiment of the present invention, and the base station is located in the region. Wireless channels of the 100 and the repeater 200 coexist. Accordingly, the mobile terminal 300 located in the corresponding area also simultaneously receives the radio channel of the base station 100 and the radio channel of the repeater 200.

First, the repeater 200 receives a radiation signal from the mobile terminal 300 located in an area where the radio channels of the base station 100 and the repeater 220 are simultaneously received (S100).

Then, the repeater 200 transmits the received radiation signal to the base station 100 through the relay line 400 connected to the base station 100 in a wired manner with each other (S200). In this case, the repeater converts the received radiation signal from the mobile terminal 100 into an analog signal or a digital signal and transmits the converted signal.

Then, the base station 100 receives the radiation signal received through the relay line 400 and performs joint detection considering the base station channel and the repeater channel (S300). Preferably, the base station 100 receives the radiation signal from the mobile terminal 300 through the base station radio channel, separately from the reception of the radiation signal from the mobile terminal in the repeater 200. Thereafter, the base station 100 receives the radiation signal transmitted through the relay line 400, and the radiation signal from the mobile terminal 300 received through the base station 100 radio channel and the repeater 200 radio channel, respectively. By self-analyzing, joint detection considering the base station channel and the repeater channel is performed. That is, the base station 100 estimates the radio channel state between the base station and the mobile terminal, removes signals from other base stations and other mobile terminals, and significantly improves the S / N ratio by estimating the radio channel state between the repeater and the mobile terminal. do.

Finally, referring to FIG. 3, a repeater operating method of a TD-SCDMA system according to a third embodiment of the present invention will be described.

Basically, in the method of operating a repeater of the TD-SCDMA system according to the third embodiment of the present invention, the base station 100 and the repeater 200 are mixed in a corresponding region as in the first and second embodiments of the present invention. In the region, the radio channels of the base station 100 and the repeater 200 coexist. Accordingly, the mobile terminal 300 located in the corresponding area also simultaneously receives the radio channel of the base station 100 and the radio channel of the repeater 200.

First, the repeater 200 receives a radiation signal from the mobile terminal 300 located in an area where the radio channels of the base station 100 and the repeater 220 are simultaneously received (S100).

Then, the repeater 200 transmits the received radiation signal to the base station 100 through the relay line 400 connected to the base station 100 in a wired manner with each other (S200). In this case, the repeater converts the received radiation signal from the mobile terminal 100 into an analog signal or a digital signal and transmits the converted signal.

Then, the base station 100 receives the radiation signal received through the relay line 400, and transmits the radiation signal from the mobile terminal 300 received through the base station channel and the radiation signal received through the relay line. Collect (S300). That is, the base station 100 receives the radiation signal from the mobile terminal 300 through the base station radio channel, in addition to receiving the radiation signal from the mobile terminal 300 in the repeater 200. Thereafter, the base station 100 receives the radiation signal transmitted through the relay line 400, and the radiation signal from the mobile terminal 300 received through the base station 100 radio channel and the repeater 200 radio channel, respectively. To be collected.

Thereafter, the base station 100 analyzes the collected radiation signal and performs joint detection considering the base station channel and the repeater channel (S300). That is, the base station 100 estimates the radio channel state between the base station and the mobile terminal by sampling the collected radiation signal, removes signals from other base stations and other mobile terminals, and estimates the radio channel state between the repeater and the mobile terminal. This significantly improves the S / N ratio.

Through the above-described configuration, the repeater operating method of the TD-SCDMA system according to the present invention is to estimate the radio channel state between the base station and the mobile terminal in a mixed area of the base station and the outdoor repeater, and to remove signals from other base stations and other mobile terminals. In addition, the signal-to-noise (S / N) ratio can be remarkably improved by estimating the radio channel state between the repeater and the mobile terminal.

In addition, in the mobile communication system using combined detection, it is possible to prevent the confusion of the repeater radio channel estimation, thereby enabling the use of the repeater, thereby reducing network construction cost and improving quality.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

Claims (6)

In a repeater operation method of a time division-code division multiple access (TD-SCDMA) system in a region where a base station and a repeater are mixed, a) the repeater receiving a radiation signal from a mobile terminal located in an area in which the radio channels of the base station and the repeater are simultaneously received; b) sampling, by the repeater, a radiation signal from the mobile terminal to extract a pilot signal; c) transmitting, by the repeater, the pilot signal of the extracted mobile terminal to the base station through a relay line connected to the base station by wire; And d) receiving, by the base station, the pilot signal of the extracted mobile terminal and analyzing a radio channel of the radiation signal through the repeater; and a method of operating a repeater of TD-SCDMA. The method of claim 1, wherein the d) step, The base station analyzes a pilot signal by sampling a radiated signal from a mobile terminal separately received, receives a pilot signal sampled through the repeater, and detects a base station channel and a repeater channel through a sampled pilot signal. TD-SCDMA repeater operation method characterized in that the detection. In the repeater operating method of the TD-SCDMA system in the mixed base station and repeater, a) the repeater receiving a radiation signal from a mobile terminal located in an area in which the radio channels of the base station and the repeater are simultaneously received; b) the repeater transmitting the received radiation signal to the base station through a relay line connected to the base station by wire; And c) the base station receives the radiation signal from the mobile terminal separately received and the radiation signal transmitted to the repeater through the relay line, and samples the respective radiation signals to perform joint detection considering the base station channel and the repeater channel. Repeater operation method comprising a; TD-SCDMA comprising a. The method of claim 2, wherein b), And the repeater transmits the received radiation signal as an analog signal or a digital signal through a relay line connected to the base station in a wired manner. In the repeater operating method of the TD-SCDMA system in the mixed base station and repeater, a) receiving, by the repeater, a radiation signal from a mobile terminal located in a region where the radio channels of the base station and the repeater are simultaneously received; b) the repeater transmitting the received radiation signal to the base station through a relay line connected to the base station by wire; c) the base station receiving the radiation signal from the mobile terminal separately received and the radiation signal transmitted to the repeater through the relay line and collecting the respective radiation signals; And and d) sampling, by the base station, the collected radiated signal and performing joint detection in consideration of a base station channel and a repeater channel. The method of claim 5, wherein b), And the repeater transmits the received radiation signal as an analog signal or a digital signal through a relay line connected to the base station in a wired manner.

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