KR101028311B1 - Repeater observation apparatus and method - Google Patents

Abstract

The present invention relates to a relay monitoring apparatus and a method thereof, and a relay monitoring apparatus for operating normally in any situation through comprehensive monitoring of switch malfunction, oscillation, change in the asymmetry ratio of a TDD frame, and the like in a TDD relay system; It is intended to provide a method.

To this end, the present invention provides a relay monitoring apparatus comprising: downlink output level detection means for detecting a downlink output level; Downlink time detecting means for detecting a downlink time; Uplink output level detecting means for detecting an uplink output level; Uplink time detecting means for detecting uplink time; And a level comparison and each link based on signals received from the uplink output level detecting means, the downlink output level detecting means, the uplink time detecting means, and the downlink time detecting means according to a previous link control signal. By comparing the time detection signal, if the repeater oscillation and switch malfunction are detected, the signal is transmitted to the central control unit for display. If the change of the asymmetric traffic is detected, the link control signal for the changed asymmetric traffic is generated through the switch control unit. And frame time level comparison means for causing the changes to be displayed.

TDD, Relay Monitoring, Frame Synchronization, Asymmetric Traffic, Mobile Internet, Link Control Signal

Description

Relay monitoring apparatus and method

1 is an exemplary configuration diagram of a conventional TDD relay device;

2 is an exemplary view illustrating a process of generating a link control signal of a general link control unit;

3 is a block diagram of a portable Internet relay system using a relay monitoring apparatus according to an embodiment of the present invention,

4 is a block diagram of a portable Internet relay system using a relay monitoring apparatus according to another embodiment of the present invention,

5 is an explanatory diagram showing frame time information of a TDD signal in a portable Internet relay system using a relay monitoring apparatus according to the present invention;

6 is a diagram illustrating an exemplary switch structure for preventing oscillation in a portable Internet relay system using a relay monitoring apparatus according to an embodiment of the present invention;

7 is a diagram illustrating an exemplary switch structure for preventing oscillation in a portable Internet relay system using a relay monitoring apparatus according to another embodiment of the present invention;

8 is a configuration diagram of an embodiment of a relay monitoring device linked to the link control unit according to the present invention;

9 is a flowchart illustrating an asymmetric traffic detection process in the relay monitoring method according to the present invention;

10 is a flowchart illustrating an operation of detecting a switch malfunction and oscillation in the relay monitoring method according to the present invention.

* Explanation of symbols for the main parts of the drawings

301: first band limiting filter 302,306: directional coupler

303: first switch control unit 304: gain unit

305: second switch control unit 307: second band limit filter

308: uplink detector 309: downlink detector

310: link control unit 311: relay monitoring device

The present invention relates to a relay monitoring apparatus and a method thereof, and more particularly, to provide a general monitoring function for switching malfunction, oscillation, and change of asymmetry ratio of a TDD frame in a time division duplex (TDD) relay method. The present invention relates to a relay monitoring apparatus and method for enabling a TDD relay system to operate normally in any case.

Here, the time division duplex (TDD) refers to a bidirectional transmission scheme in which uplinks and downlinks are alternately assigned in time in the same frequency band. This TDD scheme has higher transmission efficiency than frequency division duplexing (FDD) scheme, which allocates different frequencies for uplink and downlink, and is suitable for asymmetric or bursty application transmission due to dynamic allocation of timeslots. There is a characteristic. In addition, TDD is also one of the target technology of the 2.3GHz band portable Internet method.

The basic concept of the portable Internet refers to "portable internet service that provides high-speed wireless Internet access anywhere, anytime while stopping and moving." Here, "stop and move" basically means that the Internet should be able to be flexibly connected to the indoors of homes and offices, as well as outdoors such as parks and streets, and "high speed" basically This means that the transmission speed of the high-speed wired Internet level (1 to 2Mbps per subscriber) must be supported.

Currently, it is a technology that enables high-speed wireless Internet access in the 2.3GHz band, and foreign technologies (i-burst, flash-OFDM, etc.) of WiBro (Wireless Broadband) and WDSL (Wireless Digital Subscriber Line) technologies Wireless LAN (Local Area Network) improvement technology.

The portable Internet service of the 2.3 GHz band refers to a service that can provide a variety of information and contents by accessing the Internet at a high transmission speed in a stationary and walking state using a portable wireless terminal.

Currently, according to the ideas of communication experts, various types of terminals, such as a personal computer (Personal Computer) or a PDA (Personal Digital Assistants), are expected to be used as portable terminals. However, these early dedicated terminals are likely to evolve into integrated multi-mode terminals in the long term with the development of communication technology. Although mobility varies depending on the technology, it guarantees a slightly higher level of walking mobility than the current wireless LAN in the 2.4 GHz band.It also provides stable speeds above average 1 Mbps, depending on the technology. By providing, it is expected that smooth wireless internet will be possible.

The portable Internet utilizes the 2.3 GHz band to overcome the limitations of existing systems in terms of usage area and charges, and provides high-speed Internet access on the go as well as stationary at the quality and cost of Asymmetric Digital Subscriber Line (ADSL). Means Internet service.

The mobile Internet is faster than the transmission speed during the movement pursued by the existing IMT-2000 (International Mobile Telecommunication-2000), and unlike the WLAN (Wireless LAN) can provide Internet services in indoor as well as outdoor mobile environment.

In addition, the mobile Internet supports handoff between cells as in the conventional mobile communication service, and provides seamless service even while moving. In addition, as with wired Internet, the company seeks to maximize bandwidth efficiency in order to enable constant charge based connection. In other words, the aim of the present invention is to overcome the market limitations of existing mobile communication services by securing economic feasibility, and to provide the same internet access environment as wired lines using various portable computer terminals including notebook PCs.

On the other hand, in the current wireless communication market in which frequency securing is a big problem, a time division duplex (TDD) method that enables communication with a single frequency has been in the spotlight in recent years. Unlike the past, this is believed to be possible due to the development of parts and equipment that can be synchronized at the right time.

TDD method can theoretically support the same service using smaller timeslot than Frequency Division Duplexing (FDD) method, and also has a structure similar to the current Internet by using asymmetrical arrangement of up / down time slots. It has the technical characteristics suitable for the transmission of the application. As a result, the frequency can be used at a relatively low cost by enabling a high transmission rate without using only half as compared to the FDD scheme.

Due to these characteristics, TDD technology has become a very attractive technology for wireless carriers, but in the meantime, it is very difficult to detect the synchronization of time slot dynamic allocation and solve the problem of time delay according to transmission distance. Had been hit. Recently, however, various technologies have overcome this problem and are expanding the market. As described above, since downlink can be easily combined with many current wired Internet communication systems, it is in the spotlight again.

1 is an exemplary configuration diagram of a conventional TDD relay device, in which "11" is a base station antenna, "12" is a directional coupler (D / C), "13", "17" is a switch (SW), and "14". "19" denotes a band limit filter, "15", "20" denotes a low noise amplifier (LNA), "16" and "21" output amplifiers, "18" denotes a service antenna, and "22" denotes a switch controller. Indicates.

As shown in FIG. 1, the conventional TDD relay apparatus has a structure of detecting a synchronization of a TDD frame and controlling a switch based thereon.

As a method of detecting the TDD frame synchronization, as shown in FIG. 2 to be described later, the preamble signal of the uplink / downlink is generally detected to synchronize with the base station, and the switch is controlled based on the base station antenna 11 when the downlink is activated. The base station signal introduced through the signal is amplified via the switch 13, the band limiting filter 14, and the low noise amplifier 15 through the output amplifier (high power amplifier) 16, and then the switch 17 and the service antenna 18. Is delivered to the terminal.

On the contrary, when the uplink is activated, the terminal signal input through the service antenna 18 and the switch 17 is amplified by the band limiting filter 19, the low noise amplifier 20, and the output amplifier 21, and then the switch 13. ) Is transmitted to the base station through the base station antenna 11.

As described above, since the conventional TDD scheme requires an algorithm for appropriately switching uplink / downlink through frame sync detection, the conventional TDD repeater can detect TDD frame sync well to properly switch up / down. Was the main concern.

Therefore, in order to overcome these limitations, there is a need for a method of monitoring a specific TDD repeater. That is, through comprehensive monitoring of the switch operation status of the repeater, oscillation problem, isolation problem, and asymmetric traffic change of the portable Internet frame, the repeater properly establishes a proper link between the base station and the terminal under any circumstances. There is a need for a way to relay.

The present invention has been proposed to meet the above requirements, and in the TDD relay method, a relay monitor that can operate normally in any situation through comprehensive monitoring of switch malfunction, oscillation, change in the asymmetry ratio of the TDD frame, and the like. It is an object of the present invention to provide an apparatus and a method thereof.

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.

The apparatus of the present invention for achieving the above object comprises: a downlink output level detecting means for detecting a downlink output level; Downlink time detecting means for detecting a downlink time; Uplink output level detecting means for detecting an uplink output level; Uplink time detecting means for detecting uplink time; And a level comparison and each link based on signals received from the uplink output level detecting means, the downlink output level detecting means, the uplink time detecting means, and the downlink time detecting means according to a previous link control signal. By comparing the time detection signal, if the repeater oscillation and switch malfunction are detected, the signal is transmitted to the central control unit for display. If the change of the asymmetric traffic is detected, the link control signal for the changed asymmetric traffic is generated through the switch control unit. And frame time level comparison means for causing the changes to be displayed.

In addition, the method of the present invention includes a relay monitoring method, comprising: a downlink output level detecting step of detecting a downlink output level; A downlink time detecting step of detecting a downlink time; An uplink output level detecting step of detecting an uplink output level; An uplink time detection step of detecting uplink time; And a level comparison and each link time detection signal based on the detected uplink output level, the detected downlink output level, the detected uplink time, and the detected downlink time according to a previous link control signal. In comparison, when a repeater oscillation and a switch malfunction are detected, a signal is transmitted to the central control unit for display, and when a change in asymmetric traffic is detected, a link control signal for the asymmetric traffic is generated through the switch control unit, and the change is changed. A frame time level comparison step for display.

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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 the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a portable Internet relay system using a relay monitoring apparatus according to an embodiment of the present invention.

As shown in FIG. 3, the portable Internet relay system (a time division duplex (TDD) relay system) using the relay monitoring apparatus according to the present invention processes downlink and uplink signals received through a base station antenna and a service antenna. A gain unit 304 for detecting a downlink signal, a downlink detector 309 for detecting a downlink signal, an uplink detector 308 for detecting an uplink signal, and levels and time information of the downlink and uplink signals Based on the monitoring result of the relay monitoring device 311 and the relay monitoring device 311 for monitoring the frame time change and relay performance, the link control signal is generated by matching the frame synchronization based on the downlink and uplink signals. First and second switches for switching to downlink or uplink according to the link control signal by mutual switching operation with the link control unit 310. And a position control section (303 305).

The operation of the portable Internet relay system using the relay monitoring apparatus according to an embodiment of the present invention having the above configuration will be described in detail as follows.                     

The downlink signal received through the base station antenna passes through the first band limiting filter 301 and passes through the first switch control unit 303 through the directional coupler (D / C) 302 to provide a low noise amplifier (LNA) 314. A downlink signal is input among the TDD signals having the frame structure of FIG. 5 which is amplified through the CPL 324 and described below to the link control unit 310 by the coupler (CPL) 324.

Based on the downlink signal input as described above, a link control signal is generated in synchronization with the frame through preamble detection, signal demodulation, level detection, and the like, as shown in FIG. 2. 303), the second switch control unit 305 is properly controlled to switch the uplink / downlink to properly relay the base station signal and the terminal signal.

Here, referring to the operation of the relay monitoring apparatus 311 in synchronization with the TDD frame, in the case of downlink, the signal received from the base station antenna passes through the first band limiting filter 301 and the first switch controller 303. Amplified by the low noise amplifier 314 and then supplied to the link controller 310 and the amplifier (AMP) 334 through the coupler 324. The link control unit 310 generates a link control signal based on the signal transmitted through the coupler 324 and monitors the link signal, and the amplifier 334 amplifies the output signal of the coupler 324 to attenuate ( 344 is then passed to the high power amplifier (HPA) 354 to obtain the desired output level, and the signal past the high power amplifier 354 is passed through the second switch controller 305 to the directional coupler 306. To signal.

Then, the directional coupler 306 transmits the signal in two directions, the second band limiting filter 307 and the downlink detector 309. In this case, the signal passing through the second band limiting filter 111 is transmitted to the terminal through the service antenna, and the downlink detector 309 detects the downlink level and time information based on the signal from the directional coupler 306. To the relay monitoring device 311.

On the contrary, in the case of uplink, the signal received from the service antenna is passed through the second switch control unit 305 through the second band limiting filter 307 through the first switch control unit 303 and the low noise amplifier 314 and the amplifier. The directional coupler 302 enters the directional coupler 302 through the second switch control unit 305 and the first switch control unit 303 through the attenuator 344 and the high power amplifier 354. The signal is divided by the detector 308, and the main uplink signal is transmitted to the base station through the first band limiting filter 301 and the base station antenna.

At this time, the uplink detection unit 308 detects the level information and time information of the signal received from the directional coupler 302 and transmits it to the relay monitoring device 311. In this case, the relay monitoring apparatus 311 may cause an internal oscillation phenomenon and a malfunction of the switch, and the base station may modify the ratio of the uplink / downlink according to the service environment as necessary.

In the present invention, in order to actively cope with such a change in the surrounding environment, the relay monitoring device 311 detects downlink level and time information and uplink level and time information to detect switch malfunction, oscillation, and up / down of a TDD frame. Solve the problem of the change in the downlink ratio to facilitate a smooth relay.

Here, a specific operation process of the relay monitoring device 311 will be described in FIG. 8 to be described later.

The structure of FIG. 3 uses the same link for the uplink / downlink link as compared to the structure of FIG. 4 to be described later, so that the system can be easily implemented and the cost can be reduced.

4 is a block diagram of a portable Internet relay system using a relay monitoring apparatus according to another embodiment of the present invention.

As shown in FIG. 4, the portable Internet relay system (a time division duplex (TDD) relay system) using the relay monitoring apparatus according to the present invention includes a first gain unit for processing a downlink signal received through a base station antenna. 404, a second gain unit 412 for processing the uplink signal received through the service antenna, a downlink detector 409 for detecting the downlink signal, and an uplink for detecting the uplink signal The link detection unit 408, a relay monitoring device 411 for detecting frame time change and relay performance by detecting the level and time information of the downlink and uplink signals, and monitoring results of the relay monitoring device 411. Based on the downlink and uplink signals, the link control unit 410 and the switching control unit for generating a link control signal in synchronization with the frame are operated to operate according to the link control signal. It includes first and second switch control unit (403, 405) for switching switches to a direction link or uplink.

In the portable Internet relay system using the relay monitoring apparatus according to another embodiment of the present invention having the configuration as described above, the gain unit for performing uplink or downlink signal processing, the first gain unit 404 and the second gain unit ( Since the operation process is performed separately by installing at 412, the process is the same as that of FIG. 3, and a detailed description thereof will be omitted.

6 is an exemplary explanatory diagram showing a switch structure proposed for oscillation prevention in a portable Internet relay system using a relay monitoring apparatus according to an embodiment of the present invention, wherein the monitoring relay apparatus 311 having the structure of FIG. ) Is a configuration for securing the isolation between the uplink and the downlink signal when properly switched through the link control signal.

As shown in FIG. 6, when the downlink is activated, the base station signal is amplified through the gain unit 64 through the first switch 60, the second switch 61, and the third switch 62. Next, the data is transmitted to the terminal through the fifth switch 65, the sixth switch 66, and the seventh switch 65. At this time, the uplink has a high isolation with respect to the first path due to the fifth switch 65, the fourth switch 63, and the first switch 60, so that the monitoring relay 311 does not oscillate with the base station. Signal relay can be smoothly performed by the terminal.

On the contrary, when the uplink is activated, the three relays, like the seventh switch 67, the eighth switch 68, and the third switch 62, have high isolation, so that the monitoring relay 311 has no problem with the oscillation problem. The base station and the terminal signal can be relayed efficiently.

FIG. 7 is an exemplary explanatory diagram showing a switch structure proposed for preventing oscillation in a portable Internet relay system using a relay monitoring apparatus according to another embodiment of the present invention. The monitoring relay apparatus 411 having the structure of FIG. In the following description, a configuration for securing isolation between uplink and downlink is described.

As shown in FIG. 7, when downlink is activated, the base station signal is amplified through the first gain unit 73 through the first switch 70 and the second switch 71, and then the third switch 74. The fourth switch 75 is transmitted to the terminal. At this time, the uplink which is the inactive link is the first switch 71, the sixth switch 79, the fourth switch 75, the fifth switch 76 is turned off (OFF), the second gain unit 77 The second attenuator 78 therein has a maximum value, so that the monitoring relay device 411 can smoothly transmit the base station signal to the terminal without oscillation.

On the contrary, when the uplink is activated, the first switch 70, the second switch 72, the third switch 74, and the fourth switch 75 of the downlink which are inactive links are turned off. The first attenuator 72 in the first gain unit 73 has a maximum value so that the terminal signal can be smoothly transmitted to the base station without oscillating uplink.

8 is a diagram illustrating an embodiment of a relay monitoring apparatus in which a link control unit is linked according to the present invention.

As illustrated in FIG. 8, the relay monitoring apparatuses 311 and 411 according to the present invention include a downlink output level detector 81 for detecting a downlink output level, and a downlink time detector for detecting a downlink time. 84, an uplink output level detector 82 for detecting an uplink output level, an uplink time detector 85 for detecting an uplink time, and an uplink according to a previous link control signal Based on the signals received from the downlink output level detectors 81 and 82 and the uplink and downlink time detectors 84 and 85, level comparison and respective link time detection signals are compared to perform repeater oscillation and switch malfunction. If it detects, it transmits a signal to the central control unit 86 so that the operator can display it, and if it detects a change in asymmetric traffic, it changes through the switch control unit 87. A frame time the level comparison section 83 for generating a link to the control signal for the asymmetric traffic and display for the operator to know the changes.

Referring to the asymmetric traffic detection process, repeater oscillation, switch malfunction detection process of the operation of the relay monitoring apparatus according to the present invention having the structure as shown in FIG. 8 in more detail.

9 is a flowchart illustrating an asymmetric traffic detection process in the relay monitoring method according to the present invention, and illustrates an operation process when asymmetric traffic of a TDD frame is changed.

As shown in FIG. 9, when a repeater is first operated or a malfunction of a switch is detected during operation, or periodically, TDD frame synchronization is detected through preamble detection and downlink level detection as shown in FIG. 8 (901 to 903). When reliability is secured (904), if it is determined that frame synchronization is detected, a link control signal is generated (905). The detected TDD frame structure is compared with the previous frame structure (906). Update (907).

10 is a flowchart illustrating an operation of detecting a switch malfunction and oscillation in the relay monitoring method according to the present invention.

Even if the monitoring relay properly synchronizes the downlink signal transmitted from the base station with the frame synchronization, there may be a case in which an internal oscillation and an operation error of the switch occur, thereby preventing a smooth relay function.

As shown in FIG. 10, the downlink level and time information is detected (1001 to 1003) and the uplink level and time are detected (1006 to 108). Repeatedly determine the reliability (1005, 1009) performs a function to allow the operator to know whether there is an abnormality.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk). 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.

According to the present invention as described above, if the level information and time information of the TDD signal is detected and applied to a relay system including a relay monitoring device, an appropriate relay can be performed in any environment, and a change in asymmetric traffic of the base station can be updated. Therefore, it can be applied to all kinds of TDD repeater systems, and it is possible to further increase the reliability of equipment through the alarm information of the TDD repeater.

Accordingly, the present invention provides a comprehensive monitoring of the switch operation state of the repeater, oscillation problem, isolation problem, and change of asymmetric traffic of the mobile Internet frame. It has the effect of being able to relay.

Claims (11)

In the relay monitoring device, Downlink output level detecting means for detecting a downlink output level; Downlink time detecting means for detecting a downlink time; Uplink output level detecting means for detecting an uplink output level; Uplink time detecting means for detecting uplink time; And According to a previous link control signal, the level comparison and the respective link time are based on the signals received from the uplink output level detecting means, the downlink output level detecting means, the uplink time detecting means, and the downlink time detecting means. By comparing the detection signals, when the repeater oscillation and the switch malfunction are detected, a signal is transmitted to the central control unit for display. When a change in the asymmetric traffic is detected, a link control signal corresponding to the changed asymmetric traffic is generated through the switch control unit. Frame time level comparison means for displaying the changes Relay monitoring device comprising a. The method of claim 1, The frame time level comparison means, When a repeater detects a malfunction of a switch during the first operation or operation, or when TDD frame synchronization is detected periodically through preamble detection and downlink level detection, and reliability is secured, a link control signal is detected. And a relay monitoring apparatus that generates a different ratio by comparing the detected TDD frame structure with the previous frame structure and updates the asymmetry ratio if different. The method of claim 1, The frame time level comparison means, A relay monitoring device that detects the level and time of the downlink, detects the level and time of the uplink, and judges each reliability by comparing four signals and displays the presence or absence of an abnormality. In the relay monitoring method, A downlink output level detecting step of detecting a downlink output level; A downlink time detecting step of detecting a downlink time; An uplink output level detecting step of detecting an uplink output level; An uplink time detection step of detecting uplink time; And According to a previous link control signal, a level comparison and each link time detection signal are compared on the basis of the detected uplink output level and the detected downlink output level with the detected uplink time and the detected downlink time. In case of detecting repeater oscillation and switch malfunction, it transmits a signal to the central control unit and displays it.If a change of asymmetric traffic is detected, it generates a link control signal suitable for the changed asymmetric traffic and displays the change. Frame time level comparison Relay monitoring method comprising a. delete delete delete delete delete delete delete

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