KR100712652B1 - Mobile communication system comprising mobile communication network repeater used in in-building system and service method thereof - Google Patents

Abstract

The present invention relates to a mobile communication system having a mobile communication network relay device used in an in-building system, comprising: a master unit installed at a predetermined position in a building and drawing a radio frequency (RF) signal from a base station; It is installed by each floor and provides the service by communicating with the mobile terminals located in the service area by using the installed floor as a service area, and each one divides the overall set FA by setting only one frequency (Frequency Allocation). The relay having a plurality of slave units, and the FA of which the signal strength is large when the signal strength of the FA currently being service is smaller than the preset reference value by analyzing the signal strength of the FA currently being serviced and the signal strength of another FA. A mobile terminal requesting a change to the base station through the relay device; The mobile terminal checks the signal strength of the FA currently being serviced and checks the signal strength of another FA when the measured signal strength of the FA is less than a preset reference value, and the strength of the other FA signal is greater than the preset reference value. If large, a change request message is sent to another FA, and the base station changes the FA of the corresponding mobile terminal upon receiving the FA change request message.

In-building, relay, master, slave

Description

MOBILE COMMUNICATION SYSTEM COMPRISING MOBILE COMMUNICATION NETWORK REPEATER USED IN IN-BUILDING SYSTEM AND SERVICE METHOD THEREOF}             

1 is a view showing a schematic overall installation structure and a reverse noise state of a mobile communication network relay device used in a general in-building system

FIG. 2 is a schematic diagram showing the overall structure of a mobile communication network relay device used in an in-building system and a reverse noise state according to an embodiment of the present invention.

FIG. 3 is a block diagram of the entire master unit of FIG. 2.

4 is a block diagram illustrating an entire block unit of FIG. 2.

5 is a flowchart illustrating a frequency allocation changing operation of a mobile terminal provided with a service through a mobile communication network relay apparatus used in an in-building system according to an embodiment of the present invention.

The present invention relates to a relay device of a mobile communication network, and more particularly, to a mobile communication system having a small or micro relay device used in an in-building system and a service method thereof.

The mobile communication system is a base station management system that operates and manages a plurality of base station transceiver systems, a base station controller, and a plurality of base station controllers, which communicate with a mobile terminal (mobile station) located within a corresponding service area. (Base Station Manger System), Switching Center System (Mobile Switching Center), etc. Such a mobile communication system generally covers the call service area by the proper arrangement of each base station, but there is a call shadow area where the call quality is significantly degraded, such as the underground space of a large building or the inside of a high-rise building. Therefore, the mobile communication system amplifies the signal received from the base station and transmits the signal received from the base station to the mobile terminal in the shaded area and prevents the signal received from the mobile terminal in the shaded area in order to prevent the quality of communication service caused by the shaded area formed in the basement or building. Wireless repeaters that amplify and transmit to base stations are installed and operated in the shaded area.

FIG. 1 is a diagram illustrating a schematic overall installation structure and a reverse noise state of a mobile communication network relay device used in a general in-building system. Referring first to the installation structure of the relay device with reference to (a) of Figure 1, the relay device is installed in an appropriate position (for example, the top of the building) in the building and the base station (not shown) to cover the shadow area inside the building A master unit 130 for drawing a radio frequency (RF) signal from a wired or wirelessly. The master unit 130 is connected to a plurality of slave units 140a to 140h that may be installed for each floor. The slave units 140a to 140h provide a service by communicating with a mobile terminal (not shown) located in the service area using the installed floor as a service area. The master unit 130 and the slave unit 140a to 140h are connected via a wired cable to transmit a signal, and the transmission signal may use an RF or IF (Intermediate Frequency) signal.

Since such relay devices, which are widely used in in-building and the like, can cover the shadow area relatively economically, a large amount of small repeaters are expected to be used in the next generation mobile communication system IMT-2000. In particular, as the proportion of data-oriented services increases in voice-oriented services, the role of the relay device in the in-building system is not merely to secure a range of services, but to accommodate subscriber capacity and to serve as a spot cell. Its importance is growing.

However, the capacity of the relay device widely used in in-building and the like has a problem of being limited by the reverse output, unlike the base station defined by the blocking probability by soft capacity. That is, the reverse output of most relay devices currently supplied is, for example, a very small class of 21 dBm or less, and can increase the noise level of the base station when the reverse output is increased. Therefore, the capacity of the relay device is limited because the reverse power of the relay device should be designed to be low within the range that does not affect the service. In (a) of FIG. 1, slave units 140a to 140h installed in respective floors are configured according to frequency allocation (FA) of the corresponding mobile communication system (FA1, 2, 3, and 4 in the example of FIG. 1). FIG. 1 (b) shows that the reverse noise levels by the slave units 140a to 140h installed in each floor in the relay device are accumulated over the entire band.

Accordingly, an object of the present invention is to provide a mobile communication system having a mobile communication network relay device used in an in-building system capable of increasing capacity by reducing the backward noise level as compared with the prior art, and a service method thereof.

In order to achieve the above object, an aspect of the present invention is a mobile communication system having a mobile communication network relay device used in an in-building system, which is installed at a predetermined position in a building to receive a radio frequency (RF) signal from a base station. It draws a master unit and communicates with the master unit, and is provided for each floor to provide a service by communicating with a mobile terminal located in a corresponding service area using the installed floor as a service area, and each FA (Frequency Allocation) in advance. A relay device having a plurality of slave units that divide and set the FAs that are set up entirely, and analyze the signal strengths of the FAs currently being serviced and the signal strengths of other FAs. If the reference value is smaller than the reference value, the relay device changes to FA with a large signal strength. It characterized in that it comprises a mobile terminal requesting to the base station through.                         

According to another aspect of the present invention, a master unit installed at a predetermined position in a building and drawing a radio frequency (RF) signal from a base station and communicating with the master unit is installed for each floor and uses the installed floor as a service area. A mobile communication network used in an in-building system composed of a plurality of slave units that provide services by communicating with a mobile terminal located in a service area, and each of which sets only one FA (Frequency Allocation) in advance and divides the overall set FA. A service method of a mobile communication system having a relay device, the method comprising: checking a signal strength of a FA currently being serviced by the mobile terminal; and a different FA if the signal strength of the checked FA is smaller than a predetermined reference value previously set. Checking the signal strength of the other FA signals When the strength is greater than a preset reference value, transmitting a change request message to the other FA and changing the FA of the corresponding mobile terminal when the base station receives the FA change request message. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

FIG. 2 is a diagram illustrating a schematic installation overall structure and a reverse noise state of a mobile communication network relay device used in an in-building system according to an embodiment of the present invention. Referring to Figure 1 (a), the relay device according to an embodiment of the present invention is installed in a suitable location (for example, the top of the building) in the building to cover the shadow area inside the building as in the conventional base station ( The master unit 230 which draws the RF signal from a wire or wirelessly through a wired or wireless communication with a mobile terminal (not shown) installed in each floor and serving the installed floor as a service area to provide a service. It is composed of a plurality of slave units (240a ~ 240h) to provide. The master unit 230 and the slave unit 240a to 240h are connected via a wired cable to transmit a signal, and the transmission signal may use an RF or IF signal.

In this case, the relay apparatus according to the present invention intends to lower the backward noise level by dividing the FA for each floor and servicing the conventional full band by amplifying each floor. That is, as shown in Fig. 2, the slave units 240a to 240h provided for each floor are, for example, when the frequency allocation is set to FA 1, 2, 3, 4, 8th to 1st floor. Only one FA, which is properly set for each floor, is set up (8F-FA 1, 7F-FA 2, 6F-FA 3, 5F-FA 4, 4F-FA 1, etc.). To this end, each slave unit 240a to 240h services only the corresponding FA using a channel saw filter. In (b) of FIG. 1, since the reverse noise levels of the slave units 240a to 240h installed in each floor in the relay device are accumulated in the assigned FAs, it can be seen to be very low compared to the related art. Hereinafter, the configuration and operation of the master unit 230 and the slave units 240a to 240h will be described in detail with reference to the accompanying drawings.

3 is a block diagram of the master unit 230 of FIG. 2. Referring to FIG. 3, in the master unit 230, a signal received through an antenna ANT from a base station (not shown) is input to a duplexer 312 through an arrester 310 and a duplexer 312. Only the reception band is passed through and input to the low noise amplifier (LNA) 314. The signal output from the low noise amplifier 314 is input to the up / down module 320. The up / down module 320 performs frequency filtering, frequency conversion, and amplification for frequency downconversion. do. The signal output from the up / down module 320 is amplified by the drive amplifier 316 and then input to the duplexer 318 and then transmitted to each slave unit 240a to 240h. The signal input to the up / down module 320 is input to the mixer 322 for frequency downconversion through the preamplifier 321, and a difference signal from a local signal from the internal oscillator is received. After being output, the bandpass is passed by the band pass filter 323, and then inputted through the attenuator 324 and the amplifier 325 to the mixer 326 and down-converted, and then output through the amplifier 327.

The signal transmitted from the slave units 240a to 240h to the master unit 230 is input to the duplexer 318, and only the reception band is passed through the duplexer 318 to the low noise amplifier (LNA) 346. The signal output from the low noise amplifier 346 is input to the up / down module 330. The up / down module 330 performs frequency filtering, frequency conversion, and amplification for frequency up-conversion. do. The signal output from the up / down module 330 is amplified by the high power amplifier (HPA) 344 and then input to the duplexer 312 and then transmitted to the base station through each antenna ANT. The signal input to the up / down module 330 is input to the mixer 322 for up-converting the frequency through the preamplifier 331, and then outputs a difference signal with a local signal from the internal oscillator. After being band-passed by 333, the attenuator 334 and the amplifier 335 are input to the mixer 336, and the frequency is up-converted, and then output through the amplifier 337.

4 is a block diagram illustrating the entire configuration of the slave units 240a to 240h of FIG. 2. Referring to FIG. 4, in the master unit 230, the transmitted signal is input through the duplexer 312 and input to the up / down module 420, where the up / down module 420 is a frequency. Frequency filtering, frequency conversion, and amplification operations for downconversion are performed. The signal output from the up / down module 420 is amplified by the drive amplifier 416 and then input to the duplexer 418 and then transmitted to each mobile terminal (not shown) through the antenna ANT. . The signal input to the up / down module 420 is input to the mixer 422 through the preamplifier 421 for frequency downconversion, and then outputs a difference signal with the local signal from the internal oscillator. After being band-passed by 423, the attenuator 424 and the amplifier 425 are input to the mixer 426 to be down-converted, and then output through the amplifier 427. In this case, the band pass filter 423 is set to band pass only one FA set in the corresponding slave units 240a to 240h according to the characteristics of the present invention.

The signal transmitted from the mobile terminal to the slave units 240a to 240h is input to the duplexer 418 through the antenna ANT and then to the low noise amplifier (LNA) 446. The signal output from the low noise amplifier 446 is input to the up / down module 430. The up / down module 430 performs frequency filtering, frequency conversion, and amplification for frequency up-conversion. do. The signal output from the up / down module 430 is input to the duplexer 412 and transmitted to the base station. The signal input to the up / down module 430 is input to the mixer 422 for up-converting the frequency through the preamplifier 431, and then outputs a difference signal with the local signal from the internal oscillator. After the band is passed by 433, the attenuator 434 and the amplifier 435 are input to the mixer 436 and the frequency is up-converted, and then output through the amplifier 437. In this case, the band pass filter 433 is set to band pass only one FA set in the corresponding slave units 240a to 240h according to the characteristics of the present invention.

The configuration and operation of the mobile communication network relay device used in the in-building system having the above configuration can be made, and through this configuration, the relay device can reduce the reverse noise level to each of the mobile terminals within the service range while providing mobile communication. To provide services. However, in the above configuration, since only one FA is allocated to each floor, for example, the call service may be interrupted when the mobile terminal provided with the service on a specific floor moves between floors. Accordingly, in the present invention, the mobile terminal analyzes the signal strength of the FA currently being received and the signal strength of another FA so as to perform an operation of requesting the base station to change the FA appropriately. This will be described in more detail with reference to FIG. 5.

5 is a flowchart illustrating an operation of changing a frequency allocation of a mobile terminal provided with a service through a mobile communication network relay device used in an in-building system according to an embodiment of the present invention. Assuming that the mobile terminal is receiving service through FA1, first, in step 510, the mobile terminal checks the FA1 signal strength. Thereafter, in step 512, it is determined whether the signal strength of the examined FA1 is smaller than a preset reference value. If the signal strength is smaller than the preset reference value, the flow proceeds to step 514. In step 514, other FA signal strengths are inspected. In step 516, it is determined whether the strength of the other FA signals that are examined is greater than a preset reference value. If the signal strength is greater than the reference value, the flow proceeds to step 528. If the signal strength is not greater than the reference value, the flow proceeds to step 518.

In step 518, the mobile terminal is considered to be out of service range, and in step 520, a notification message is transmitted. The notification message is provided to the master unit via the slave unit 1 which is currently providing the service to the mobile terminal (step 522) and then provided to the base station (step 524). The base station performs an appropriate function in step 526 by the reception of the notification message.

On the other hand, if the strength of the other FA signal is greater than the preset reference value in step 516, the change request to the corresponding FA in step 528, the change request message is provided to the slave unit 1 (step 530), the master unit Through step 532 is provided to the base station (step 536). In step 536, the base station receiving the FA change request message changes the FA of the corresponding mobile terminal (for example, changes to FA2). Accordingly, the mobile communication service passes through the master unit through the corresponding slave unit 2 of FA2. Provided to the mobile terminal (steps 538, 540, 542).

As described above, the mobile terminal analyzes the signal strength of the FA currently being serviced and the signal strength of the other FA, and requests the base station to change the FA accordingly, so that the FA changes.

As described above, the configuration and operation of a mobile communication system including a mobile communication network relay device used in an in-building system according to an embodiment of the present invention can be performed. Although described, various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but by the claims and equivalents of the claims.

As described above, the mobile communication system including the mobile communication network relay device used in the in-building system of the present invention amplifies and services the conventional full band as shown in FIG. 1 by dividing the FA for each floor. Compared with the relay, the noise level can be reduced by several times FA. As a result, the reverse output can be increased up to 4 times, which is advantageous for securing coverage in the shadow area, and also eliminates unnecessary handovers in a building with a mixture of pseudorandom noise (PN).

Claims (3)

A mobile communication system having a mobile communication network relay device used for an in-building system, A master unit installed at a predetermined location in a building and drawing a radio frequency (RF) signal from a base station, and communicating with the master unit, and installed in each floor and having a corresponding installed floor as a service area, a mobile terminal located in a corresponding service area A relay device having a plurality of slave units which provide a service by communicating with a service, and each of which has a single FA (Frequency Allocation) set in advance to divide and service the overall set FA; Analyzes the signal strength of the FA currently being serviced and the signal strength of another FA, and requests the base station to change the FA to a base station through the relay device when the signal strength of the FA currently being service is smaller than a preset reference value. Relay device comprising a mobile terminal. The relay apparatus of claim 1, wherein the master unit and the slave unit are connected through a wired cable to transmit a signal, and the transmission signal uses an RF signal. A master unit installed at a predetermined location in a building and drawing a radio frequency (RF) signal from a base station, and communicating with the master unit, and installed in each floor and having a corresponding installed floor as a service area, a mobile terminal located in a corresponding service area And a mobile communication network relay device used in an in-building system composed of a plurality of slave units each providing a service by dividing the totally set FA by providing only one FA (Frequency Allocation) in advance. In the service method of the communication system, Checking the signal strength of the FA currently being serviced by the mobile terminal; When the signal strength of the examined FA is smaller than a preset reference value, Checking the signal strength of other FAs, Transmitting a change request message to the other FA when the strength of the other FA signal checked is greater than a preset reference value; And changing the FA of the corresponding mobile terminal when the FA change request message is received by the base station.

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