JP4832555B2 - Frequency induction device and frequency induction method - Google Patents

Description

  The present invention relates to a frequency induction device that guides a mobile device so that a frequency assigned to a cell can be captured, and a frequency induction method.

  In a conventional mobile communication network, a plurality of base stations (BTS: Base Transceiver Station) are installed in each region, and a plurality of radio wave arrival areas (referred to as “cells”) formed by each base station are arranged. Enables continuous wireless communication even when moving across cells. A mobile device captures the frequency of a radio wave transmitted by a base station installed in a moved cell and transmits a location registration signal for performing location registration in the cell, thereby entering a state in which the mobile station is located. Communication via a base station installed in the cell becomes possible.

In recent years, in addition to the conventional cell having a large radius of several kilometers (hereinafter referred to as “macro cell” or “Macro Cell”), a relatively narrow small cell has been proposed (see, for example, Patent Document 1). Among them, a very small cell having a radius of about several meters is called a femto cell and is being put into practical use. A base station that forms a femto cell (hereinafter also referred to as “Femto BTS”) is a base station that is assumed to be installed in a home or a small office. When such a femtocell is put to practical use, when a mobile device moves into the femtocell, it is necessary to perform control to enable the mobile device to smoothly capture the frequency of the femtocell and to communicate via the femto base station. There is.

JP 2008-263632 A

As shown in FIG. 9, there are three types of frequency bands that are currently allocated to the macro cell: 2000 Mhz band, 1700 Mhz band, and 800 Mhz band, and there are two types of frequency bands in the 2000 Mhz band. Further, the frequency band allocated to the femtocell includes a 2000 MHz band, and there are four types of frequency bands in the 2000 MHz band.
When capturing the frequency of the destination cell, the mobile device searched for only frequencies that had been in the past in order to avoid battery consumption, and there were multiple frequencies that had been in the past. In some cases, there is a tendency to capture a strong radio wave. Therefore, if the frequency assigned to the femtocell is a frequency that the mobile device has never been in the past, or if the radio wave strength of the macro cell that includes the area of the femtocell is strong, the mobile device There is a problem that the frequency allocated to the femtocell cannot be captured smoothly.
The present invention has been made in order to solve the above-described problems. When a mobile station moves to a small cell such as a femtocell, the frequency induction is performed so that the frequency assigned to the small cell can be smoothly captured. An object is to provide a device and a frequency induction method.

In order to solve the above-described problem, the frequency guidance device according to claim 1 is provided in a mobile communication network including a large cell and a small cell having different sizes of areas communicable with a mobile device, and the mobile device is A frequency guidance apparatus that causes the mobile device to be located in the small cell by guiding frequency acquisition assigned to the small cell when moving to the small cell, the frequency being assigned to the small cell Inductive frequency data storage means for storing induced frequency data including data indicating, and guidance for acquiring induced frequency data corresponding to the small cell from the induced frequency data storage means when the mobile device moves to the small cell a frequency data acquisition means, said induction frequency data to get the frequency of the small cells from the obtained induced frequency data by the acquisition unit, switching the operating frequency to the frequency of the small cell By sending a control signal for changing the mobile station, and a first frequency induction means for capturing the frequency allocated to the small cell in the mobile station, said mobile station from said small cells The location registration signal transmitted from the mobile device when residing in a large cell includes data indicating the frequency assigned to the small cell, and the frequency data storage means is configured so that the mobile device has the small mobile data. The induced frequency data is stored on the basis of a location registration signal transmitted from the mobile device when a cell is located in the large cell .

  According to the present invention, the frequency induction device stores induction frequency data including data indicating a frequency assigned to a small cell, and obtains the induction frequency data when a mobile device moves to the small cell, Since the mobile device captures the frequency assigned to the small cell based on the obtained induced frequency data, when the mobile device moves to the small cell, the frequency assigned to the small cell is smoothly set. The mobile can be guided so that it can be captured.

Further , induced frequency data can be stored using a location registration signal when the mobile device is located in a large cell from a small cell.

Frequency induction device according to claim 2, wherein the moving Oite to claim 1, and serving determining means for determining whether the mobile station is located in the small cells by the visited determining means A second frequency guidance means that attempts to cause the mobile station to sequentially capture frequencies that may be assigned to the small cell when it is determined that the mobile station is not located in the small cell; It is characterized by having.
According to the present invention, when the mobile device is not located in a small cell, the frequency guidance device attempts to cause the mobile device to sequentially capture frequencies that may be assigned to the small cell. Therefore, when the mobile device exists in the small cell and the frequency allocated to the small cell cannot be acquired, the mobile device can be located in the small cell.

According to a third aspect of the present invention , in the frequency induction device according to the second aspect , the second frequency induction unit preferentially captures the frequency indicated by the induction frequency data stored in the induction frequency data storage unit. It is characterized by trying.
According to the present invention, there is a high possibility that the frequency indicated by the induced frequency data is a frequency assigned to a small cell, so that the time until the frequency is captured can be shortened.

According to a fourth aspect of the present invention , in the frequency guidance device according to the second or third aspect , when the location determination unit receives a specific signal based on a user operation from the mobile device, the mobile device It is characterized by determining whether or not the user is in a small cell.
According to the present invention, when a user is in a small cell, the user performs an operation for transmitting a specific signal, so that the mobile device is located in the small cell and the base station forms the small cell. You can confirm that you are communicating. On the other hand, when the mobile device is not located in the small cell, the mobile device can be located in the small cell to perform communication via the base station that forms the small cell.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the small cell is included in the large cell.
According to the present invention, even when a small cell is included in the large cell, the mobile device can be guided to be located in the small cell instead of the large cell.
A frequency induction device according to a sixth aspect of the present invention is the frequency guidance device according to any one of the first to fifth aspects, wherein the small cell is a femtocell.
According to the present invention, the user who set up a base station forming a femtocell at home or the like, it is possible to guarantee the provision of services by the femtocell.

The frequency guidance method according to claim 7 , wherein a frequency guidance device provided in a mobile communication network including a large cell and a small cell having different sizes of areas communicable with a mobile device is allocated to the small cell. A frequency guidance method for guiding frequency acquisition to a mobile device, wherein an induced frequency data storage step for storing induced frequency data including data indicating a frequency assigned to the small cell; When moving to the cell, the induced frequency data acquisition step for acquiring the induced frequency data stored in the induced frequency data storage step, and the frequency of the small cell is acquired from the induced frequency data acquired in the induced frequency data acquisition step. by sending a control signal for switching the operating frequency to the frequency of the small cell to the mobile station, before And a frequency inductive step of capturing the frequency assigned to the small cell in the mobile station, the location registration signal the mobile station is transmitted from said mobile station when located in the large cells from the small cells Includes data indicating the frequency assigned to the small cell, and in the frequency data storing step, the mobile device is transmitted from the mobile device when the mobile device is located in the large cell from the small cell. The induced frequency data is stored on the basis of an incoming position registration signal .

According to the present invention, the frequency induction device stores induction frequency data including data indicating a frequency assigned to a small cell, and obtains the induction frequency data when a mobile device moves to the small cell, Since the mobile device captures the frequency assigned to the small cell based on the obtained induced frequency data, when the mobile device moves to the small cell, the frequency assigned to the small cell is smoothly set. The mobile can be guided so that it can be captured.
Further, induced frequency data can be stored using a location registration signal when the mobile device is located in a large cell from a small cell.

According to the present invention, the frequency induction device stores induction frequency data including data indicating a frequency assigned to a small cell, and obtains the induction frequency data when a mobile device moves to the small cell, Since the mobile device captures the frequency assigned to the small cell based on the obtained induced frequency data, when the mobile device moves to the small cell, the frequency assigned to the small cell is smoothly set. The mobile can be guided so that it can be captured.
Further, induced frequency data can be stored using a location registration signal when the mobile device is located in a large cell from a small cell.

1 is a diagram illustrating an overall configuration of a communication network according to an embodiment of the present invention. It is a block diagram which shows the function structure of LMMS which concerns on the same embodiment. It is a figure showing an example of induction frequency data memorized by induction frequency data storage part concerning the embodiment. It is a flowchart which shows the storage procedure of the induction frequency data which LMMS which concerns on the same embodiment performs, and the derivation | leading-out procedure of the frequency allocated to the femtocell. It is explanatory drawing of the storage procedure of the induction frequency data which LMMS which concerns on the same embodiment performs, and the derivation | leading-out procedure of the frequency allocated to the femtocell. It is a flowchart which shows operation | movement of LMMS when a user performs special number transmission based on the embodiment, when a user is in a femtocell at home etc. It is a flowchart which shows operation | movement of LMMS when a user performs special number transmission based on the embodiment, when a user is in a femtocell at home etc. It is explanatory drawing which shows operation | movement of LMMS at the time of a user making a special number transmission when the user is in a femtocell etc. at home etc. based on the embodiment. It is a figure which shows an example of the frequency band currently allocated to the macrocell and the femtocell.

Embodiments of the present invention will be described below with reference to the drawings. In each drawing referred to in the following description, components equivalent to those in the other drawings are denoted by the same reference numerals.
FIG. 1 is a diagram showing an overall configuration of a mobile communication network according to an embodiment of the present invention. As shown in the figure, the mobile communication network according to the present embodiment includes a mobile device 10, macro base stations 20a and 20b forming a macro cell having a radius of several kilometers, and a femto cell having a radius of several meters. A femto base station 30 forming a (Femto Cell), an HLR (Home Location Register) 50 for managing subscriber information and area information of a user who uses the mobile device 10, and a subscriber of the mobile device 10 existing under the control. Information and location information acquired from the HLR 50 and managed by an LMMS (Local Multimedia Switching System) 40 and subordinate base stations 20a, 20b and 30 are controlled and controlled by an RNC (Radio Network Controller). Device) 60. There are actually a plurality of these devices constituting the mobile communication network. Each of these devices includes, as hardware, a CPU (Central Processing Unit) (not shown) that controls the entire device, a RAM (Random Access Memory) that stores software such as programs and data, and a ROM (Read Only Memory). And a storage device such as a hard disk and a communication interface for controlling communication.

  In the present embodiment, as shown in FIG. 1, the macro cell formed by the macro base station 20a is “MacroCell (macro cell) # 1”, the macro cell formed by the macro base station 20b is “MacroCell # 2”, and the femto base station 30 is The femtocell to be formed is referred to as “FemtoCell (Femtocell) #A”. FemtoCell # A is included in MacroCell # 1.

Each cell is assigned RAI (Routing Area Identification) indicating a unit area where the location of the mobile device 10 is registered. Here, “RAI # 1” is assigned to “MacroCell # 1”, “RAI # 2” is assigned to “MacroCell # 2”, and “RAI # A” is assigned to “FemtoCell # A”. It shall be.
The femto base station 30 is installed in a home, and is connected to a fixed communication line such as an ADSL (Asymmetric Digital Subscriber Line) line or an optical fiber line (not shown), and an IP (Internet Protocol) communication network or the Internet. Etc. to be connected to the mobile communication network.

(Configuration of LMMS)
FIG. 2 is a block diagram showing a functional configuration of the LMMS 40. As shown in the figure, the LMMS 40 includes an induction frequency data storage unit 41, an induction frequency data acquisition unit 42, a first frequency induction unit 43, a location determination unit 44, and a second frequency induction unit 45. It has. The induction frequency data storage unit 41 is realized by a database provided in the hard disk. The induction frequency data acquisition unit 42, the first frequency induction unit 43, the located area determination unit 44, and the second frequency induction unit 45 are as follows. This is realized by the CPU of the LMMS 40 executing processing according to a program.

  The induced frequency data storage unit 41 stores induced frequency data including data indicating the frequency assigned to the femtocell (hereinafter also referred to as “femtocell frequency”). FIG. 3 is a diagram illustrating an example of induced frequency data stored in the induced frequency data storage unit 41. As shown in the figure, the induced frequency data includes an RAI identifier, an identifier of a macro cell assigned to the RAI, an identifier of a femto cell included in the macro cell, and a frequency of the femto cell.

The location registration signal transmitted from the mobile device 10 when the mobile device 10 is located in the macro cell from the femto cell includes data indicating the frequency of the femto cell. Is stored based on the location registration signal transmitted from the mobile device 10 when the mobile station 10 is located in the macro cell from the femto cell.
The location registration signal may include data indicating the frequency of the location registration destination cell. In this case, the HLR 50 stores data indicating the frequency assigned to each cell based on the received location registration signal, and the HLR 50 stores data indicating the frequency of the femtocell in the LMMS 40 when the induced frequency data is registered. Will be provided.

Further, the induced frequency data can be registered in advance by an input from an operator or the like in addition to registering using the position registration signal.
The induced frequency data acquisition unit 42 acquires induced frequency data corresponding to the femtocell from the induced frequency data storage unit 41 when the mobile device 10 located in the macro cell moves to the femtocell.
The first frequency induction unit 43 acquires the frequency of the femtocell from the induction frequency data acquired by the induction frequency data acquisition unit 42, and moves a control signal for switching the use frequency to the frequency of the femtocell via the RNC 60. By transmitting to the machine 10, the mobile machine 10 is made to capture the frequency of the femtocell. Note that a known technique standardized by 3GGP or the like can be used as a technique for causing the mobile device 10 to capture the frequency.

  The location determination unit 44 performs a specific user operation on the mobile device 10 such as a user performing a call operation by inputting a predetermined number (hereinafter referred to as “special number”) to the mobile device 10. Thus, when a specific signal based on a user operation is received from the mobile device 10, whether or not the mobile device 10 is in the femtocell, that is, the mobile device 10 is not the macro base stations 20a and 20b. It is determined whether or not communication is possible via the femto base station 30.

  When it is determined by the presence determination unit 44 that the mobile device 10 is not in the femto cell, the second frequency guiding unit 45 sets a frequency that may be assigned to the femto cell to the mobile device 10. Try to capture sequentially. At this time, when induced frequency data related to the femtocell is stored in the induced frequency data storage unit 41, an attempt is made to preferentially capture the frequency of the femtocell indicated by the induced frequency data.

(Operation example 1)
Next, with reference to the flowchart shown in FIG. 4 and the diagram shown in FIG. 5, the procedure for storing the induction frequency data and the procedure for deriving the frequency executed by the LMMS 40 will be described. Here, it is assumed that the frequency F3 is assigned to the femtocell #A.
(Remember procedure)
When the user carries the mobile device 10 and moves from the femtocell #A to the macrocell # 1 when the user goes to work, the mobile device 10 captures the frequency of the macrocell # 1. Then, a location registration signal is transmitted to the macro cell # 1 including data indicating the frequency F3 assigned to the femto cell #A before movement (step S101 in FIGS. 4 and 5).

  When receiving the location registration signal from the mobile device 10, the HLR 50 recognizes that the femtocell #A exists in the area of the macrocell # 1 because the mobile device 10 has moved from the femtocell #A to the macrocell # 1. Then, information including the location registration of the mobile device 10 in the macro cell # 1 provided in the RAI # 1, the macro cell # 1 being included in the femto cell #A, the frequency F3 of the femto cell #A, and the like. Is stored as the location information of the mobile device 10 (step S102 in FIGS. 4 and 5). Then, the HLR 50 transmits the location information to the LMMS 40.

  When the LMMS 40 receives the location information of the mobile device 10 from the HLR 50, the LMMS 40 stores the location information and determines whether the induced frequency data corresponding to the RAI # 1 is stored in the induced frequency data storage unit 41. (Step S103 in FIG. 4). If the induced frequency data corresponding to RAI # 1 is not stored in the induced frequency data storage unit 41, the LMMS 40 uses the data shown in FIG. 3 included in the received location information as induced frequency data as the induced frequency. It memorize | stores in the data memory | storage part 41 (step S104 of FIG. 4). On the other hand, when the induced frequency data corresponding to RAI # 1 is stored, the stored induced frequency data is overwritten and saved with the latest data shown in FIG. 3 (step S105 in FIG. 4).

(Guidance procedure)
Next, a procedure for deriving a frequency allocated to the femtocell #A when the user returns home will be described with reference to FIGS.
When the user carrying the mobile device 10 moves from the macro cell # 2 to the macro cell # 1, the mobile device 10 transmits a location registration signal to the macro cell # 1 (step S106).
When the LMMS 40 receives the location registration signal from the mobile device 10, the LMMS 40 recognizes that the mobile device 10 has approached the femtocell #A, and performs induction to the frequency of the femtocell #A. Specifically, the LMMS 40 determines whether or not induced frequency data corresponding to RAI # 1 in which the macro cell # 1 is provided is stored in the induced frequency data storage unit 41 (step S107).

When the induced frequency data corresponding to RAI # 1 is stored in the induced frequency data storage unit 41, the induced frequency data acquisition unit 42 assigns to the femtocell #A from the induced frequency data corresponding to RAI # 1. Get the frequency that is being used. Here, the induced frequency data shown in FIG. 3 is stored in the induced frequency data storage unit 41, and the induced frequency data acquisition unit 42 acquires the frequency F3 included in the induced frequency data (step S108).
And the 1st frequency induction | guidance | derivation part 43 is guide | induced to make the mobile device 10 capture the frequency F3 by transmitting the control signal for switching a use frequency to F3 to the mobile device 10 via RNC60.

In step S106, if the induced frequency data corresponding to RAI # 1 is not stored in the induced frequency data storage unit 41, the process ends.
Thus, the induced frequency data is stored when the mobile station 10 is located in the macro cell # 1 from the femtocell #A, and the stored induced frequency is stored when the mobile station 10 moves to the femtocell #A. In order for the mobile station 10 to capture the frequency of the femtocell #A based on the data, the femtocell #A is included in the macrocell # 1 or the radio wave of the macrocell # 1 is stronger. The mobile device 10 can be guided so that the frequency of the cell #A can be captured smoothly.

(Operation example 2)
Next, referring to the flowcharts shown in FIGS. 6, 7, and 8, whether or not the mobile device 10 is in the femtocell #A when the user is in the femtocell #A at home or the like, That is, the operation of the LMMS 40 when the user makes a special number call in order to confirm whether or not the mobile device 10 can communicate via the femto base station 30 will be described. Here, it is assumed that the frequencies that can be assigned to the femtocell #A are F1, F2, F3, and F4.

First, the user operates the mobile device 10 to instruct a special number transmission. Thereby, the mobile device 10 transmits a transmission signal including the special number (step S201 in FIG. 6).
Upon receiving the outgoing signal from the mobile device 10, the location determination unit 44 of the LMMS 40 determines whether the mobile device 10 is in the femtocell #A based on the stored location information of the mobile device 10. It is determined whether the user is in # 1 (step S202).
If it is determined that the user is in the femtocell #A, the process is terminated (step S203).

On the other hand, when it is determined that the user is in the macro cell # 1, the second frequency guiding unit 45 of the LMMS 40 performs a process for causing the mobile device 10 to be in the femto cell #A. Specifically, the second frequency guide unit 45 first determines whether or not the guide frequency data corresponding to the area where the mobile device 10 exists is stored in the guide frequency data storage unit 41 (step S204). ).
When the induction frequency data is not stored in the induction frequency data storage unit 41, as shown in FIG. 8, the second frequency induction unit 45 of the LMMS 40 is in the order of F1, F2, F3, and F4. The frequency acquisition instruction is performed until the frequency can be acquired.

  Specifically, first, the second frequency guiding unit 45 determines whether or not F1 has been tried by designating the frequency F1 so far (step S205 in FIG. 6). If it has been designated, the process proceeds to step S209. If it has not been designated, the designated frequency is set as F1, and a frequency acquisition instruction signal is transmitted to the mobile device 10 via the RNC 60 (step S206). Then, the second frequency guiding unit 45 sets a location registration waiting timer and waits for X seconds (for example, 10 seconds) for the location registration request signal to be transmitted from the mobile device 10 (step S207). It is determined whether or not a location registration signal is transmitted from the mobile device 10 within X seconds (step S208), and the mobile device 10 captures the frequency F1 when the location registration signal is transmitted within X seconds. If it is determined that the femtocell #A is located, the process ends (step S221).

On the other hand, if the location registration signal is not transmitted from the mobile device 10 within X seconds and the timer expires, it is determined that the mobile device 10 cannot capture the frequency F1 and cannot reach the femtocell #A. The process proceeds to S209.
Then, for frequencies F2, F3, and F4, frequency acquisition is attempted until the mobile device 10 can acquire the frequency in the same procedure as steps S205 to S208.
On the other hand, when the induced frequency data corresponding to the area where the mobile device 10 exists is stored in the induced frequency data storage unit 41 in step S204, the second frequency guiding unit 45 calculates the frequency from the induced frequency data. To get. Here, it is assumed that the induced frequency data corresponding to the region RAI # 1 including the femtocell #A shown in FIG. 3 is stored, and the second frequency guiding unit 45 has acquired F3.

The second frequency guiding unit 45 designates the frequency as F3 (step S301 in FIG. 7), and attempts to cause the mobile device 10 to capture the frequency F3 in the same procedure as that in steps S207 to S208 (step S301). S302, S303).
If it is determined that the mobile station 10 has succeeded in acquiring the frequency F3 by receiving the location registration signal from the mobile station 10 within X seconds after setting the timer, the process is terminated (step S316). On the other hand, if the location registration signal is not received within X seconds, the frequency acquisition not specified so far is performed in the same procedure as that in steps S205 to S208 until the frequency acquisition is successful. Try sequentially (steps S304 to S315).

  If the mobile device 10 is not located in the femtocell #A by performing the frequency induction processing of the femtocell #A by the special number transmission as described above, there is a possibility that the mobile device 10 is assigned to the femtocell #A. Since the mobile device 10 tries to sequentially acquire certain frequencies F1, F2, F3, and F4, the frequency of the femtocell #A can be acquired even though the mobile device 10 exists in the femtocell #A. If not, the mobile device 10 can be located in the femtocell #A. Also, for example, when the frequency of the femtocell #A changes due to the installation of a new building or antenna near the place where the femtocell #A exists, the frequency of the femtocell #A is set to the mobile station 10. Can be captured. Therefore, although the user has installed the femto base station 30 at home or the like, the problem that the user cannot be located in the femto cell #A and cannot communicate via the femto base station 30 can be solved. .

Moreover, when the induced frequency data corresponding to the area where the mobile device 10 exists is stored in the induced frequency data storage unit 41, the frequency indicated by the induced frequency data is highly likely to be the frequency of the femtocell. Therefore, it is possible to shorten the time until the frequency is captured by preferentially capturing the frequency.
If the LMMS 40 periodically determines the area where the mobile device 10 exists without triggering the special number transmission from the mobile device 10, and the mobile device 10 determines that it exists in the femtocell area, FIG. You may perform the process after step S202 shown in FIG.

Moreover, when the induction frequency data was not memorize | stored in the induction frequency data memory | storage part 41, it demonstrated that the 2nd frequency induction | guidance | derivation part 45 performed the capture | acquisition instruction | indication of a frequency in order of F1, F2, F3, and F4. However, the order of frequencies at which acquisition instructions are given is not limited to this. For example, the order may be selected at random, or the acquisition instructions may be given from frequencies with a large number of acquisitions in the past.

In the above-described embodiment, the function of the frequency induction device according to the present invention has been described as being provided in the LMMS 40. However, the present invention is not limited to this, and the function provided in the LMMS 40 described above is a plurality of other devices. It may be dispersed and arranged. Further, the function provided in the LMMS 40, the function provided in the HLR 50, and the function provided in the RNC 60 may be arranged in one device.
In the above-described embodiment, the large cell is described as a macro cell and the small cell is a femto cell. However, the present invention is not limited thereto, and the small cell may be a cell smaller than the large cell. In the above-described embodiment, the small cell is described as being included in the large cell. However, the present invention is not limited to this, and some areas may overlap or may be adjacent to each other.

10 Mobile station 20a, 20b Macro base station 30 Femto base station 40 LMMS
41 Induction frequency data storage unit 42 Induction frequency data acquisition unit 43 First frequency induction unit 44 In-zone determination unit 45 Second frequency induction unit 50 HLR
60 RNC

Claims (7)

Guidance of frequency acquisition provided in a mobile communication network including a large cell and a small cell having different sizes of areas communicable with a mobile device, and allocated to the small cell when the mobile device moves to the small cell A frequency guidance device that causes the mobile device to be located in the small cell by performing
Induced frequency data storage means for storing induced frequency data including data indicating the frequency assigned to the small cell;
Induced frequency data acquisition means for acquiring induced frequency data corresponding to the small cell from the induced frequency data storage means when the mobile device moves to the small cell;
The small cell frequency is obtained from the induced frequency data obtained by the induced frequency data obtaining means, and the control signal for switching the use frequency to the small cell frequency is transmitted to the mobile device, and assigned to the small cell. First frequency guiding means for causing the mobile device to capture the frequency being used, and the location registration signal transmitted from the mobile device when the mobile device is located in the large cell from the small cell. , Including data indicating the frequency assigned to the small cell,
The frequency data storage means stores the induced frequency data based on a location registration signal transmitted from the mobile device when the mobile device is located in the large cell from the small cell. Frequency induction device. Area determination means for determining whether or not the mobile station is in the small cell;
If the mobile station determining means determines that the mobile station is not in the small cell, the mobile station first attempts to cause the mobile station to sequentially capture frequencies that may be allocated to the small cell. The frequency induction device according to claim 1, further comprising: 2 frequency induction means. The second frequency guiding means includes
The frequency induction device according to claim 2 , wherein an attempt is made to preferentially acquire the frequency indicated by the induction frequency data stored in the induction frequency data storage means. The presence determination means determines whether or not the mobile device is present in the small cell when a specific signal based on a user operation is received from the mobile device. The frequency induction device according to claim 2 or claim 3 . The frequency induction device according to claim 1, wherein the small cell is included in the large cell. The frequency induction device according to claim 1, wherein the small cell is a femto cell. A frequency guidance device provided in a mobile communication network including a large cell and a small cell having different sizes of areas that can communicate with a mobile device guides the mobile device to acquire a frequency allocated to the small cell. A frequency induction method,
An induced frequency data storage step for storing induced frequency data including data indicating the frequency assigned to the small cell;
An induction frequency data acquisition step of acquiring the induction frequency data stored in the induction frequency data storage step when the mobile device moves to the small cell;
The small cell frequency is acquired from the induced frequency data acquired in the induced frequency data acquisition step, and the control signal for switching the use frequency to the small cell frequency is transmitted to the mobile device, and assigned to the small cell. A frequency induction step for causing the mobile device to capture the frequency being used, and the location registration signal transmitted from the mobile device when the mobile device is located in the large cell from the small cell includes Contains data indicating the frequency assigned to the cell,
In the frequency data storing step, the induced frequency data is stored based on a position registration signal transmitted from the mobile device when the mobile device is located in the large cell from the small cell. The frequency induction method.

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