KR101496890B1 - Wireless communication relay system by means of pilot beacon, and method the same - Google Patents

Abstract

The present invention discloses a mobile communication relay system and method via pilot beacons. A mobile communication relay system using pilot beacons according to the present invention includes a relay station located in a mobile communication relay zone between a first base station, a second base station, a first base station and a second base station, and a relay station located in the mobile communication relay zone Wherein the repeater performs a handover with a mobile station by forming a pilot beacon signal on a first frequency after filtering a predetermined first frequency among at least two frequencies corresponding to a second base station, A call to the mobile station via a first frequency or a second frequency is relayed to the second base station after frequency-shifting the call to be handed over to a first frequency or a second frequency which is a predetermined traffic frequency among at least two frequencies . Therefore, the present invention can reduce the frequency expansion cost to meet the condition of frequency matching required for smoothly performing the handover between the base stations, Handover can be performed even when the mobile terminal is not switched to the compressed mode.

Pilot beacon, repeater

Description

TECHNICAL FIELD [0001] The present invention relates to a mobile communication relay system and method using a pilot beacon,

The present invention relates to a handover of a mobile communication network, and more particularly, to a handover method of a mobile communication network, which not only smoothly performs pilot beacon hard handover through a repeater (for example, an optical repeater) located in a mobile communication relay area, And more particularly, to a mobile communication relay system and method using a pilot beacon for establishing a call connection without error even when a mobile station tuning to a frequency of a pilot beacon signal is generated.

In the CDMA method, a plurality of channels are used in the same one frequency, and each channel is distinguished using a specific code. The forward link transmitted from the base station to the mobile station includes a pilot, a synchronous, a call, and a call channel. The pilot channel is used for the mobile station to identify the mobile station and identify the base station.

Also, the pilot channel is used as a criterion for determining the coverage of the base station, and the coverage of the base station is determined by the ratio of the signal-to-interference signal of the pilot channel received at the mobile station. This ratio varies depending on the number of users in the call, i.e., the system load. If the load increases, the transmission power of the communication channel increases and the quality of the pilot channel degrades, thereby reducing the coverage.

However, when the load decreases, the coverage increases. In addition, the synchronous channel transmits information of the time information and the paging channel. The paging channel is used for call setup and message delivery of the system. Lt; / RTI >

When the capacity of the CDMA system is insufficient, a frequency is additionally allocated to each base station. Therefore, there is a difference in frequency used for each base station.

When a mobile station passes through a boundary area between base stations, a handover is performed to continue a call. In a handover performed in a CDMA system, soft handover applied when the frequencies of the two base stations are the same, There are two types of handover.

When a mobile station using the frequency FA1 moves to a base station having only the frequency FA2, inter-frequency hard handover is performed. In this case, since the mobile station transmits and receives using only the frequency FA1 in the base station boundary region, Can not be captured.

Therefore, a pilot beacon is applied to the mobile station in order to acquire the handover target base station, and the pilot beacon is used only for capturing the handover target base station, but is not used for the actual call.

In more detail, when a mobile station using the frequency 3FA enters the base station boundary region in the CDMA system, the handover target base station that does not use the frequency 3FA generates a pilot beacon signal to radiate the PN signal of the handover target base station After the mobile station forms a pilot channel, it requests handover to the handover target base station.

Thereafter, the CDMA system confirms that the handover target base station uses only 2FA and 1FA excluding the frequency 3FA, and designates either 2FA or 1FA to perform hard handover.

Here, since the CDMA system has a channel list, the mobile stations in the IDLE state tuning in the cell area formed by the base station to be handed over control to make a call only through 2FA and 1FA without tuning to 3FA No problem.

However, since the WCDMA system does not have channel list information, it controls the mobile stations in the IDLE state tuning in the cell area formed by the handover target base station through 2FA and 1FA to set channels through only 2FA and 1FA there is a problem.

One of the reasons for the problem is that in the WCDMA system, the Ec / lo and RSCP values are reported to the FAs having no traffic and the UEs are switched from the coverage of the handover target base stations using only 2FA and 1FA to the power- , There is a problem that the call can not be executed after 3 FAs formed for handover due to the principle of first tuning to FAs with no traffic.

Further, in the mobile communication boundary zone, not only the target base station is present but mostly optical repeaters, and a method for performing the pilot beacon handover through the optical repeater is required.

In addition, it is a time when a method for easily performing a pilot beacon handover through an optical repeater already provided is required.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for smoothly performing pilot beacon hard handover through a repeater (for example, Another object of the present invention is to provide a mobile communication relay system and method using a pilot beacon for establishing a call connection without error even when a mobile station tuning to a frequency of a pilot beacon signal inducing a handover occurs.

It is another object of the present invention to provide a mobile communication relay system and method using a pilot beacon for easily performing a pilot beacon handover through a repeater already provided.

It is still another object of the present invention to provide a mobile communication relay system and method using a pilot beacon for efficiently implementing a pilot beacon device including a built-in or external device in a repeater.

It is still another object of the present invention to provide a mobile communication relay system (hereinafter, referred to as " mobile communication relay system ") that uses a pilot beacon to perform a handover in a state where a mobile station located in a mobile communication relay area does not switch to a compressed mode And a method.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a mobile communication relay system using a pilot beacon, the mobile communication relay system comprising: a first mobile station located in a mobile communication relay area between a first base station, a second base station, And a mobile station that moves from the first base station to the mobile communication relay region, wherein the repeater filters a predetermined first frequency among at least two or more frequencies corresponding to the second base station, A mobile station, and a mobile station. The mobile station performs a handover with the mobile station. The mobile station transitions the handover call to a first frequency or a second frequency, which is a predetermined traffic frequency of the at least two frequencies, Or accepts a call to the mobile station over the second frequency to relay to the second base station And that is characterized.

Preferably, when the mobile station is connected to the first base station through a third frequency that is not allocated to the second base station, the repeater may filter the first frequency and convert the first frequency to the third frequency, And transmits the pilot beacon signal to the mobile station through the third frequency to form a pilot channel.

Preferably, when the relay station includes the mobile station and allocates the channel to the first frequency or the third frequency to at least one of the mobile stations located in the mobile communication relay region, And frequency-transitions the frequency to the second frequency to perform call connection.

According to a second aspect of the present invention, there is provided a repeater located in a mobile communication relay zone between a first base station and a second base station in a mobile communication network, A mobile station for communicating a call of the mobile station to the second base station through a first frequency, filtering a predetermined first frequency among at least two or more frequencies corresponding to the second base station, An amplifier unit for coupling the pilot beacon signal to a front end of the amplifier output and radiating the pilot beacon signal to the mobile communication relay region, a mobile station that forms a pilot channel in response to the pilot beacon signal, And a pilot beacon unit for transmitting the handover call And a controller for receiving a call of the mobile station by frequency shifting to a second frequency that is a predetermined traffic frequency among the at least two frequencies and relaying the call of the mobile station to the second base station through the mobile communication unit .

Preferably, the pilot beacon unit includes a pilot beacon unit for forming the pilot beacon signal, and a combining module for combining the pilot beacon unit and the pilot beacon unit.

Preferably, the pilot beacon unit filters the first frequency and converts the third frequency to the third frequency when the mobile station is connected to the first base station through a third frequency not assigned to the second base station, And the pilot beacon signal is formed through the third frequency.

Advantageously, the first frequency is parameterized with a parameter value corresponding to cell selection or cell reselection to a value that does not accommodate the call of the mobile station.

Preferably, the third frequency is equal to the parameter value.

Advantageously, the second frequency is parameterized with a parameter value corresponding to cell selection or cell reselection to a value that accepts the call of the mobile station.

Preferably, the control unit changes the third frequency to the first frequency or the second frequency through the pilot beacon unit when the control unit forms the handed-over call through the third frequency.

Preferably, when the control unit allocates the third frequency in response to a call connection request from the mobile communication relay zone, the control unit may transmit the third frequency to the second frequency, .

Preferably, the control unit frequency-transitions the first frequency to the second frequency when the first frequency is allocated in response to a call connection request from the mobile communication relay region.

Preferably, the control unit maintains the second frequency when allocating the second frequency in response to a call connection request from the mobile communication relay region.

Preferably, the mobile station performs the handover without switching to a compressed mode (CM) for searching for an adjacent frequency in the mobile communication relay area.

According to a third aspect of the present invention, there is provided a pilot beacon device in a repeater located in a mobile communication relay region between a first base station and a second base station in a mobile communication network, A filter unit for filtering and extracting a predetermined first frequency among at least two frequencies provided from the second base station when the mobile terminal moves to the mobile communication relay region, A digital / analog converter for converting the pilot beacon signal, which is a digital signal, into an analog signal, and a digital / analog converter for converting the pilot beacon signal to a digital signal, And an output section for outputting to be coupled to the front end of the amplifier output, A first frequency group is characterized in that the transition frequency to said at least one group of two or more frequencies in a second frequency set traffic frequency receiving a call of the mobile station through the repeater.

Preferably, the pilot beacon apparatus further includes a coupling unit for coupling with the repeater.

According to a fourth aspect of the present invention, there is provided a mobile communication relay method using pilot beacons, wherein a repeater located in a mobile communication relay area between a first base station and a second base station of a mobile communication network, A pilot beacon step of generating and outputting a pilot beacon signal through the first frequency, a pilot beacon step of outputting pilot beacon signals to the mobile station and the pilot channel, A handover step of performing a handover with the mobile station that moves from the first base station, a frequency for frequency-shifting the handed-over call to a second frequency that is a preset traffic frequency among the at least two frequencies, A transition step and the number of calls of the mobile station via the second frequency And it characterized in that it comprises a communication relaying step for relaying to the second base station.

Advantageously, the pilot beacon phase transforms the first frequency to the third frequency when the mobile station is connected to the first base station via a third frequency that is not assigned to the second base station, 3 < / RTI > frequency of the pilot beacon signal.

Preferably, the pilot beacon step couples the pilot beacon signal to a front end of the amplifier output of the repeater, amplifies the pilot beacon signal, and radiates the amplified pilot beacon signal to the mobile communication repeater area.

Accordingly, in the present invention, not only smooth pilot handover of a pilot beacon through a repeater (for example, a photogether) located in a mobile communication relay area is performed smoothly, but also a mobile station tuning to a frequency of a pilot beacon signal It is possible to reduce the cost of adding frequency to meet the condition of frequency matching required for smoothly performing the handover between the base stations, There is an advantage that handover can be performed even when the mobile station does not switch to the CM (Compressed Mode) for searching for the adjacent frequency.

Hereinafter, a preferred embodiment of a mobile communication relay system using pilot beacons according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a mobile communication relay system using pilot beacons according to an embodiment of the present invention. 1, a mobile communication relay system using pilot beacons includes a first base station 100, a second base station 400, a first base station 100 and a second base station 400 in a mobile communication network, The relay station 300 and the first base station 100 located in the mobile communication relay area, which is a communication-unoccupied area, move to a mobile communication relay area in a call connection state.

Here, as the mobile station 200 moves to the mobile communication relay region, the mobile station 200 performs a handover to the relay station 300 located in the mobile communication relay region, with respect to the call connected to the first base station 100.

For the following detailed description, the repeater 300 will be described in detail with respect to the optical repeater 300 as an example.

The optical repeater 300 may transmit at least two frequencies (e.g., a first frequency and a second frequency) corresponding to the second base station 400 from the second base station 400 being connected to the second base station 400 A pilot beacon signal is formed through the extracted first frequency by filtering and extracting a predetermined first frequency for handover through a pilot beacon scheme among the first frequency and the second frequency, The base station 200 performs handover with the mobile station 200 receiving the pilot beacon signal, frequency-transitions the handover call to a predetermined second frequency with a frequency for traffic of the first frequency and the second frequency, Receives the call for the mobile station 200 through the second frequency and relays it to the second base station 400. [

In addition, forming the pilot beacon signal through the first frequency means that the mobile station 200 enters the mobile communication relay region through the third frequency of the first base station 100 that is not allocated to the second base station 400 In this case, a predetermined first frequency is filtered and extracted for a handover in this case, and the extracted first frequency is converted to a third frequency.

Thereafter, the pilot beacon signal is formed through the third frequency formed by the demodulation, and the pilot beacon signal thus formed is coupled to the front end of the amplifier output of the optical repeater 300, amplified, and radiated to the mobile communication relay region.

2 is a configuration diagram of the optical repeater 300 shown in FIG. 2, the optical repeater 300 located in the mobile communication relay area transmits a call of the mobile station 200 that moves from the first base station 100 to the mobile communication relay area to a second base station A mobile communication unit 310 for relaying communication to the second base station 400 through a first frequency and a second frequency corresponding to the second base station 400, A pilot beacon unit 320 for forming and outputting a pilot beacon signal through the extracted first frequency, an amplifier unit 330 for coupling the pilot beacon signal to the front end of the amplifier output and outputting the pilot beacon signal to the mobile communication relay region, A handover unit 340 for performing a handover after forming a pilot channel according to the response of the mobile station 200 receiving the pilot beacon signal and a handover unit 340 for performing handover through the pilot beacon unit 320 The mobile station 200 receives a call of the mobile station 200 by frequency-shifting the call to a second frequency that is a frequency for traffic of the first and second frequencies corresponding to the second base station 400, And a control unit 350 for relaying the call to the second base station 400 through the mobile communication unit 310.

Herein, the pilot beacon unit 320 may be embodied as an internal or external type in the optical repeater 300. When implemented as an external type, the pilot beacon unit 320 may include a pilot beacon unit for forming a pilot beacon signal, And a module.

The pilot beacon signal includes a CPICH (Common Pilot Channel) signal and a SCH (Synchronization Channel) signal.

The first frequency of the second base station 400 is parameterized to a value whose parameter value corresponding to cell selection or cell reselection does not accommodate the call of the mobile station 200. [

In addition, since the third frequency formed by changing the first frequency is to maintain most of the parameter values set to the first frequency, the parameter value corresponding to the cell selection or cell reselection of the first frequency does not accept the call When a value is set, the third frequency also maintains the same parameter value.

The parameter value corresponding to cell selection or cell reselection can be set through the SIB (System Information Block) value.

If the control unit 350 makes a call to be handed over to the mobile station 200 through the third frequency, the control unit 350 frequency-shifts the third frequency to the first frequency through the pilot beacon unit 320, The first frequency is reassigned to the second frequency.

When the parameter value corresponding to the cell selection or cell reselection of the first frequency is set to a value that accepts the call of the mobile station 200, the controller 350 controls the handover of the mobile station 200, It is also possible to implement traffic so as to accommodate the traffic by shifting the call to the first frequency.

In other cases, the control unit 350 determines that the mobile station 200 is not in the handover request, but in the mobile communication relay zone, responding to the call connection requested by the mobile station 200 in the ideal state, It is preferable to frequency-shift the third frequency to a second frequency which is a traffic-dedicated frequency.

In another case, when the controller 350 is located in the mobile communication relay area and allocates the first frequency according to the response to the call connection requested by the mobile station 200 in the ideal state, the controller 350 allocates the allocated first frequency to the traffic- It is preferable that the frequency is shifted to the second frequency.

In addition, when the control unit 350 allocates the second frequency in response to the call connection requested by the mobile station 200 located in the mobile communication relay zone in the ideal state, the control unit 350 allocates the traffic dedicated frequency Maintain the assigned frequency.

Due to such a system structure, the mobile station 200 can perform the handover without switching to a compressed mode (CM) for searching for an adjacent frequency in the mobile communication relay area.

In addition, the amplifier unit 330 can utilize an amplifier already provided in the repeater 300, and can be additionally implemented as needed.

Further, since the function of the control unit 350 of the repeater 300 is implemented to be executed by the second base station 400, the repeater 300 performs a function of performing a polarization for forming a pilot beacon signal, May be implemented to run in the second base station 400.

FIG. 3 is a block diagram illustrating the pilot beacon unit 320 shown in FIG. 2. Referring to FIG. 3, the pilot beacon unit 320 is provided for the optical repeater 300 and is used for the mobile station 200 to maintain the call connected to the first base station 100, When the mobile station moves to the relay area, a filter unit 321 for filtering and extracting a first frequency preset to a frequency for handover in the pilot beacon scheme among the first frequency and the second frequency corresponding to the second base station 400 ), The mobile station 200 is connected from the first base station 100, and when the target frequency for handover is the third frequency that is not allocated to the second base station 400, the first frequency is changed to the third frequency A frequency / beacon signal portion 322 for generating a pilot beacon signal, a digital / analog conversion portion 323 for converting the pilot beacon signal, which is a digital signal, into an analog signal, An output unit 324 for outputting to be coupled to the amplifier output of the front end 300.

Further, the pilot beacon apparatus further includes a coupling portion 325 for coupling with the optical repeater 300 when the pilot beacon is externally coupled to the optical repeater 300. [

In addition, the pilot beacon device may further include a gain adjuster for adjusting the gain of the pilot beacon signal.

Here, the frequency shifter 322 performs the frequency conversion of the first frequency to the third frequency and the frequency to transmit the pilot beacon signal, then transforms the third frequency to the first frequency or the second frequency, Gt; frequency < / RTI >

The pilot beacon unit 320 includes only a frequency / beacon signal unit 322 to perform a frequency conversion and then forms a pilot beacon signal. The pilot beacon unit 320 includes a filter unit 321, a D / The output unit 323, and the output unit 324 may be implemented to execute through the repeater 300. [

4 is a flowchart illustrating an operation procedure of the mobile communication relay system through the pilot beacon shown in FIG. The mobile communication relay method using the pilot beacon may be configured such that the optical repeater 300 located in the mobile communication relay area between the first base station 100 and the second base station 400 receives the first frequency and the second frequency from the second base station 400 And proceeds to filter and extract a predetermined first frequency to form a pilot beacon signal (S1 and S3).

The optical repeater 300 converts the filtered first frequency to a third frequency that is not assigned to the second base station 400 in step S5 and generates a pilot beacon signal on the third frequency, (S7 and S9).

Thereafter, as the mobile station 200 performs channel assignment with the third frequency of the first base station 100 and performs call connection with the first base station 100 and moves to the mobile communication relay area during the call execution (S11 and S13) , And receives a pilot beacon signal radiated from the optical repeater 300 (S15).

The optical repeater 300 receives the response signal from the mobile station 200 receiving the pilot beacon signal to form a pilot channel (S17 and S19), and then transmits the corresponding frequency channel in response to the handover request of the mobile station 200 (S21 and S25), and transmits a channel assignment message to the mobile station 200 to inform the mobile station 200 that the channel is allocated to the second frequency (S27).

The mobile station 200 receiving the channel assignment message switches to the second frequency (S29), and the optical repeater 300 receives the call of the mobile station 200 through the second frequency, 400 (S31 and S33).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

Further, the present invention can be applied not only to smooth pilot handover of a pilot beacon through a repeater (for example, an optical repeater) located in a mobile communication relay area, but also to a mobile station tuning to a frequency of a pilot beacon signal Is an invention that is industrially applicable because it is intended to achieve a call connection without error even when it occurs, and it is not only possible to market or operate but is practically and practically possible.

1 is a block diagram of a mobile communication relay system using pilot beacons according to an embodiment of the present invention;

Fig. 2 is a configuration diagram of the repeater shown in Fig. 1,

FIG. 3 is a block diagram showing the pilot beacon unit shown in FIG. 2, and FIG.

4 is a flowchart illustrating an operation procedure of the mobile communication relay system through the pilot beacon shown in FIG.

Description of the Related Art

100: first base station 200: mobile station

300: repeater 310: mobile communication unit

320: Pilot beacon unit 321: Filter unit

322: frequency shift / beacon signal section

323: D / A conversion unit 324:

325: Coupling unit 330: Amplifier unit

340: handover section 350:

400: second base station

Claims (19)

delete delete delete A repeater located in a mobile communication relay area between a first base station and a second base station in a mobile communication network, A mobile communication unit for relaying a call of a mobile station located in the mobile communication relay region from the first base station to the second base station; A pilot beacon unit for filtering a predetermined first frequency among at least two frequencies corresponding to the second base station and forming and outputting a pilot beacon signal through the first frequency; An amplifier unit coupling the pilot beacon signal to a front end of an amplifier output and radiating the pilot beacon signal to the mobile communication relay region; A handover unit for performing a handover with the mobile station forming a pilot channel in response to the pilot beacon signal; And Wherein the pilot beacon unit frequency-transitions the handed-over call to a second frequency that is a predetermined traffic frequency among the at least two frequencies to accept the call of the mobile station, And a control unit for relaying to the second base station, The pilot beacon unit Wherein the mobile station filters the first frequency and transforms the third frequency to the third frequency when the mobile station is connected to the first base station through a third frequency that is not assigned to the second base station, And a signal is formed. 5. The apparatus of claim 4, wherein the pilot beacon unit A pilot beacon device for forming the pilot beacon signal; And And a coupling module for coupling with the pilot beacon device. delete 5. The method of claim 4, wherein the first frequency is Wherein parameter values corresponding to cell selection or cell reselection are parameterized to values that do not accommodate the call of the mobile station. 8. The method of claim 7, wherein the third frequency is And the parameter value is equal to the parameter value. 5. The method of claim 4, wherein the second frequency is Wherein a parameter value corresponding to cell selection or cell reselection is parameterized to a value that accepts the call of the mobile station. 5. The apparatus of claim 4, wherein the control unit And the third beacon transceiver switches the third frequency to the first frequency or the second frequency through the pilot beacon unit if the call is made through the third frequency. 5. The apparatus of claim 4, wherein the control unit Wherein the third frequency is frequency-shifted to the second frequency when the third frequency is allocated in response to a call connection request from the mobile communication relay region instead of requesting the handover. . 5. The apparatus of claim 4, wherein the control unit And when the first frequency is allocated in response to a call connection request from the mobile communication relay region, the first frequency is frequency-shifted to the second frequency. 5. The apparatus of claim 4, wherein the control unit And maintains the second frequency when allocating the second frequency in response to a call connection request from the mobile communication relay region. 5. The mobile station of claim 4, Wherein the mobile station performs the handover in a state in which the mobile station is not switched to a compressed mode (CM) for searching for an adjacent frequency in the mobile communication relay area. 1. A pilot beacon device in a repeater located in a mobile communication relay area between a first base station and a second base station of a mobile communication network, A filter unit for filtering and extracting a predetermined first frequency among at least two frequencies provided from the second base station when the mobile station moves from the first base station to the mobile communication relay area; A frequency shift / beacon signal section for generating a pilot beacon signal by converting the first frequency to a handover frequency that does not correspond to the at least two frequencies; A digital / analog converter for converting the pilot beacon signal, which is a digital signal, into an analog signal; And And an output unit for outputting the pilot beacon signal to be coupled to a front end of the amplifier output of the repeater, Wherein the first frequency is selected from the group consisting of: A frequency of a second frequency that is a predetermined traffic frequency among the at least two frequencies is received through the repeater to receive a call of the mobile station, The frequency / beacon signal portion includes: Wherein the mobile station filters the first frequency and transforms the third frequency to the third frequency when the mobile station is connected to the first base station through a third frequency that is not assigned to the second base station, Wherein said signal forming means forms a signal. 16. The apparatus of claim 15, wherein the pilot beacon device And a coupling unit for coupling with the repeater. A mobile communication relay method comprising: A relaying unit located in a mobile communication relay region between a first base station and a second base station of the mobile communication network filters and extracts a predetermined first frequency among at least two frequencies corresponding to the second base station; A pilot beacon step of forming and outputting a pilot beacon signal through the first frequency; A handover step of forming a pilot channel with a mobile station that receives the pilot beacon signal and performing a handover with the mobile station that moves from the first base station; A frequency transition step of frequency shifting the handed-over call to a second frequency which is a predetermined traffic frequency among the at least two frequencies; And And relaying to the second base station a call of the mobile station via the second frequency, The pilot beacon step The mobile station changes the first frequency to the third frequency when the mobile station is connected to the first base station through a third frequency that is not assigned to the second base station and transmits the pilot beacon signal through the third frequency Wherein the mobile communication relay method comprises: delete 18. The method of claim 17, wherein the pilot beacon step Wherein the pilot beacon signal is coupled to a front end of an amplifier output of the repeater and amplified, and then the pilot beacon is radiated to the mobile communication repeater region.

Images