JP5798460B2 - Base station and base station control method - Google Patents

Description

  The present invention relates to a base station and a control method for the base station, and more particularly to a base station connected to a mobile communication network via a general line and a control method for the base station.

  In recent years, in mobile communication systems, a base station scheme called a femto cell (Home eNode B), which covers a very small area compared to a conventional base station (wide base station, macro cell), has been proposed. A femtocell is a small base station installed in, for example, a house or a small office. A cell phone of a conventional mobile phone, that is, an area covered by one wide area base station has a radius of about 1 to several kilometers. On the other hand, the area covered by the femtocell is about several meters to several tens of meters. The femtocell is connected to a mobile communication network via a general line (a broadband line such as ADSL) drawn into each home. Since general lines are widely used as access lines, even users who are outside the macro cell area can use the same cellular phone service as the macro cell (call, mail function, SMS (Short Message Service), WEB browsing, etc.) if there is a broadband line. ) Can be used inexpensively and easily. In addition, as a telecommunications carrier, the use of femtocells and broadband lines eliminates the need for existing wide-area base station resources (bandwidth, etc.) that should have been consumed, improving the mobile phone area at low cost. There is a merit that can be.

  As described above, in the third generation (3G), the 3.9 generation (3.9G), and the IMT-ADVANCED operated in the frequency band of 2 GHz or higher, an outdoor wide area base station and an indoor femtocell are used. This combination is expected to become essential. Furthermore, since femtocells are used by a small number of terminals, they have advantages such as providing a higher-speed and high-quality data communication environment than macrocells that are congested by a plurality of terminals, and are expected to be widely used in the future.

  Since femtocells are being considered to use different frequencies for communication radio waves than macrocells, femtocells are installed in places where people gather, such as offices, shopping centers, and concert halls. It may be used for the purpose of distributing the communication load by the combined use. The femtocell in this case is not a closed access that can be used by a terminal registered in the femtocell, but an open access that can be used by all terminals and that does not require registration for use. However, when an open access femto cell is installed in a place where people are crowded in this way, many terminals will use the femto cell. In some cases, better communication performance cannot be obtained.

  As a countermeasure to this problem, if it is detected that the access is concentrated on a specific radio base station and the radio channel is congested in the conventional technology, it is different from the radio communication system constituting the radio communication area in the congested state. There has been proposed a technique for determining a terminal that can be handed off to a wireless communication system and forcibly handing off the determined terminal to the wireless communication system (see Patent Document 1).

JP 2008-270919 A

  As described above, in an open access femtocell, when a large number of terminals use the femtocell, and even if the femtocell is used, the communication performance is worse than when the macrocell is used. Should not be handed off to the femtocell.

  Also, with the method described in Patent Document 1, it is not possible to prevent another terminal from handing off to a system in which congestion occurs. It is desirable to minimize unnecessary handoffs.

  The present invention has been made in view of such problems, and an object of the present invention is to prevent a terminal from being handed off to the own station in a situation where the own station is congested. It is an object of the present invention to provide a base station and a method for controlling the base station.

To achieve the above object, the present invention is a base station recognizes a transmission unit that transmits broadcast information for detecting the moving machine own station, the mobile machine waiting to itself, the mobile station And a control unit that controls the transmission unit so as to stop transmission of the broadcast information when a predetermined number or more is reached.

Wherein, in a state that stops transmission of the broadcast information, when it is detected that the mobile station is handed off to another base station, the transmission section to start transmission of the broadcast information It is preferable to control.

Further, the present invention provides a group destination station, a transmission unit that transmits broadcast information for detecting the moving machine own station, a connection request for establishing communication to its own station by sending to the own station And a control unit that controls the transmission unit to stop transmission of the notification information when the number of connected mobile devices exceeds a certain number.

Wherein, in a state that stops transmission of the broadcast information, when it is detected that the mobile station is handed off to another base station, the transmission section to start transmission of the broadcast information It is preferable to control.

Further, the present invention provides a group destination station, a transmission unit that transmits broadcast information for detecting the moving machine own station, when the communication quality of the mobile station is worse than the communication environment of the other base station The transmission unit is controlled to stop transmission of the pilot beacon.

When the control unit detects that the communication quality of the local station is better than the communication quality of the other base station in a state where the transmission of the broadcast information is stopped, the control unit starts transmission of the broadcast information Preferably, the transmitter is controlled.

Further, the present invention includes a base station transmits a broadcast information for detecting the moving machine own station, the base station recognizes the mobile machine waiting to itself, the mobile unit is more than a certain number of when it becomes, and wherein the Turkey to stop transmission of the broadcast information.

Further, the present invention is a base station transmits a broadcast information for detecting the moving machine own station, the base station, connecting the connection request for establishing communication to its own station by sending to the own station when the mobile station is equal to or more than a predetermined number, characterized by the Turkey to stop transmission of the broadcast information.

Further, the present invention is a base station transmits a broadcast information for detecting the moving machine own station, the base station, when the communication quality of the mobile station is worse than the communication quality of another base station, And a step of stopping transmission of the broadcast information .

  According to the present invention, it is possible to prevent a terminal from being handed off to a femtocell.

1 is a schematic configuration diagram of a mobile communication system including a femto cell and a macro cell. It is a conceptual diagram when a terminal is going to move from a macro cell area to a femto cell area when transmitting a pilot beacon. It is a conceptual diagram when a terminal moves from a macro cell area to a femto cell area during transmission of a pilot beacon. It is a conceptual diagram when the terminal is about to move from the macro cell area to the femto cell area when the pilot beacon is stopped. It is a conceptual diagram when a terminal moves from a macro cell area to a femto cell area when a pilot beacon is stopped. It is a schematic block diagram shown in 1st Embodiment of the femtocell of this invention. It is a flowchart explaining the operation | movement in the pilot beacon transmission of the femtocell which concerns on 1st Embodiment. It is a flowchart explaining the operation | movement in the pilot beacon stop of the femtocell which concerns on 1st Embodiment. It is a conceptual diagram when the terminal is about to move from the femto cell area to the macro cell area when the pilot beacon is stopped. It is a conceptual diagram when a terminal moves from a femto cell area to a macro cell area and the femto cell resumes transmission of a pilot beacon. It is a schematic block diagram shown in 2nd Embodiment of the femtocell of this invention. It is a flowchart explaining the operation | movement in the pilot beacon transmission of the femtocell which concerns on 2nd Embodiment. It is a flowchart explaining the operation | movement in the pilot beacon stop of the femtocell which concerns on 2nd Embodiment. It is a schematic block diagram shown in 3rd Embodiment of the femtocell of this invention. It is a flowchart explaining the operation | movement in the pilot beacon transmission of the femtocell which concerns on 3rd Embodiment. It is a flowchart explaining the operation | movement in the pilot beacon stop of the femtocell which concerns on 3rd Embodiment.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, CDMA2000 1xEV-DO is assumed as the mobile communication system.

  FIG. 1 is a schematic configuration diagram of a mobile communication system including a femto cell and a macro cell. As shown in the figure, a mobile communication system 100 includes a macro cell (wide area base station) AN, an EV-DO core network CN, a femto cell network gateway FNG, a wide area network NET, a femto cell FAP, and a plurality of terminals (mobile devices) AT1. Includes AT3. The EV-DO core network CN is a backbone part of a mobile communication network including a PDSN (Packet Data Serving Node), a PCF (Packet Control Function), etc. (not shown). The femtocell network gateway FNG relays the connection between the wide area network NET and the EV-DO core network CN.

  In the mobile communication system 100, the macro cell AN transmits a macro cell radio wave having a frequency F1. Since the femtocell FAP draws (hands off) a terminal communicating with the macrocell AN to the femtocell, the femtocell FAP can transmit a pilot beacon having the same frequency F1 as the macrocell radio wave. The femtocell FAP itself uses femtocell radio waves (communication radio waves) of frequency F2 for communication between the own station and the terminal.

  FIG. 2 is a conceptual diagram when the terminal AT1 is about to move from the macro cell area to the femto cell area while the femto cell FAP is transmitting a pilot beacon. The terminal AT1 trying to move to the femtocell area detects the presence of the femtocell FAP by the pilot beacon.

  FIG. 3 is a conceptual diagram when the terminal AT1 moves from the macro cell area to the femto cell area while the femto cell FAP is transmitting a pilot beacon. The terminal AT1 that has moved to the femtocell area is drawn into the communication frequency F2 of the femtocell FAP by the pilot beacon and waits at the femtocell FAP.

  FIG. 4 is a conceptual diagram when the terminal AT1 is about to move from the macro cell area to the femto cell area while the femto cell FAP stops the pilot beacon. The terminal AT1 trying to move to the femtocell area cannot detect the presence of the femtocell FAP because the pilot beacon is not transmitted.

  FIG. 5 is a conceptual diagram when the terminal AT1 moves from the macro cell area to the femto cell area while the femto cell FAP stops the pilot beacon. The terminal AT1 that has moved to the femtocell area is not drawn into the communication frequency F2 of the femtocell FAP and continues to wait in the macrocell AN.

  Next, an embodiment of the femtocell (base station) of the present invention will be described. The femtocell of the present invention is not a closed access that can be used by a terminal registered in the own station, but an open access that can be used by all terminals and does not require registration in the own station for access. FIG. 6 is a schematic block diagram shown in the first embodiment of the femtocell of the present invention. As illustrated in FIG. 6, the femtocell FAP includes an antenna ANT, a control unit 110 (control unit), a wireless communication unit 120, a storage unit 140, and a wired communication unit 150.

  The wireless communication unit 120 includes a pilot beacon transmission unit 122 (transmission unit) and a terminal transmission / reception unit 126. The pilot beacon transmission unit 122 transmits a pilot beacon for drawing a terminal (mobile device) into the femtocell FAP. The terminal transmission / reception unit 126 transmits / receives a femtocell radio wave (communication radio wave) for performing cellular communication with the terminal via the antenna ANT.

  The control unit 110 includes a pilot beacon transmission control unit 111, a terminal standby number determination unit 112, and a handoff ESN determination unit 113, and controls the entire femtocell FAP. The pilot beacon transmission control unit 111 controls the pilot beacon transmission unit 122 to control the start and stop of pilot beacon transmission. The terminal standby number determination unit 112 determines whether or not the number of terminals currently waiting in the femtocell exceeds the upper limit standby terminal number. The handoff terminal ESN determination unit 113 compares the ESN notified from the femtocell management server with the ESN of the standby terminal. The ESN is a unique number (terminal identifier) possessed by the terminal. When the terminal is a mobile phone, it can be calculated from, for example, a telephone number.

  The storage unit 140 includes an upper limit standby terminal number storage unit 141, a standby terminal number storage unit 142, and a standby terminal ESN storage unit 143. The upper limit standby terminal number storage unit 141 stores the upper limit number of terminals that can be standby in the femtocell. The standby terminal number storage unit 142 stores the number of terminals currently waiting in the femtocell. The standby terminal ESN storage unit 143 stores the ESN of the terminal currently waiting in the femtocell.

  The wired communication unit 150 is connected to a wide area network NET such as the Internet via a router or a general line (a broadband line such as ADSL).

  FIG. 7 is a flowchart illustrating an operation during transmission of a pilot beacon of the femtocell according to the first embodiment. The femtocell FAP repeats loop 1 (steps S11 to S17) while transmitting the pilot beacon.

  When the femtocell FAP receives a standby request from a terminal that has received a pilot beacon transmitted by the own station (YES in S12), the femtocell FAP draws the terminal into the communication frequency of the own station and waits at the communication frequency of the own station. (S13). Thereafter, the identifier (for example, ESN) of the pulled-in terminal is stored in the waiting terminal list held by the own station (S14), and 1 is added to the number of waiting terminals held by the own station (S15). At this time, the drawn-in terminal identifier is also notified to the femtocell management server that manages the femtocell. The terminal standby number determination unit 112 determines whether the number of terminals currently waiting in the femtocell exceeds the preset upper limit standby terminal number (S16), and the standby terminal number is larger than the upper limit standby terminal number. If this is the case (YES in S16), the femtocell FAP stops the transmission of pilot beacons and prevents other terminals from handing off any more (S18).

  In addition, when a standby request is not received from the terminal which received the pilot beacon at step S12 (in the case of NO), and when the number of standby terminals is equal to or less than the upper limit standby terminal number at S16 (in the case of NO), Proceeding to step S14, the processing of loop 1 is continued and the transmission of the pilot beacon is continued.

  FIG. 8 is a flowchart for explaining the operation of the femtocell according to the first embodiment while the pilot beacon is stopped. The femtocell FAP repeats loop 2 (steps S21 to S23) while stopping transmission of the pilot beacon.

  The femtocell FAP compares the ESN notified from the femtocell management server with the ESN of the standby terminal in the handoff terminal ESN determination unit 113 (S22), and the terminal that has been waiting on its own station while the pilot beacon is stopped is the macrocell AN. Is detected (if YES at S22), the ESN of the handed-off terminal is deleted from the standby terminal list held by the own station (S24), and 1 is subtracted from the number of standby terminals held by the own station ( S25). Thereafter, the femtocell FAP starts transmission of a pilot beacon so that other terminals can handoff to the own station (S26).

  FIG. 9 is a conceptual diagram when the terminal AT2 is about to move from the femto cell area to the macro cell area while the femto cell FAP stops the pilot beacon. The terminal AT2 trying to move to the macro cell area starts a handoff operation to the macro cell AN when the radio wave of the femto cell FAP becomes weak.

  FIG. 10 is a conceptual diagram when the terminal AT2 moves from the femtocell area to the macrocell area and the femtocell FAP resumes transmission of pilot beacons. The terminal AT2 that has moved to the macro cell area waits in the macro cell AN, and the terminal AT1 that exists in the femto cell area but has been waiting in the macro cell AN is drawn into the communication frequency F2 of the femto cell FAP by the pilot beacon and waits in the femto cell FAP. .

  Note that the fact that the terminal that has been waiting in the femtocell FAP has handed off to the macro cell AN may be detected by the ESN notified from the femtocell management server, or the femtocell itself may wait for a certain period of time by Keep Alive. You may detect by confirming. In the former case, the femtocell management server acquires the identifier information of the standby terminal from the surrounding macrocell AN, and if there is an identifier that matches the identifier notified in advance by the femtocell FAP, notifies the femtocell FAP of the identifier. To do.

  In the first embodiment, when it is detected that an arbitrary terminal has handed off to the macro cell AN while the pilot beacon is stopped, that is, when the number of standby terminals returns to the upper limit standby terminal number, the transmission of pilot beacons is resumed. However, since the number of standby terminals in the femtocell FAP is considered to fluctuate in a relatively short time, in order to prevent frequent repetition of the pilot beacon transmission stop and transmission restart, determination of transmission stop and transmission restart The number of standby terminals may be a different value. That is, the femtocell FAP stops the pilot beacon when the number of standby terminals becomes equal to or greater than the stop determination standby terminal count X, detects the handoff of the terminal to the macro cell AN several times, and the standby terminal count is waiting for the restart determination. The pilot beacon transmission may be resumed when the number of terminals Y (X> Y) or less.

  Next, a second embodiment of the femtocell (base station) of the present invention will be described. FIG. 11 is a schematic block diagram shown in the second embodiment of the femtocell of the present invention. As shown in FIG. 11, the femtocell FAP includes an antenna ANT, a control unit 210 (control unit), a wireless communication unit 220, a storage unit 240, and a wired communication unit 250.

  The wireless communication unit 220 includes a pilot beacon transmission unit 222 (transmission unit) and a terminal transmission / reception unit 226. The pilot beacon transmission unit 222 transmits a pilot beacon for drawing a terminal (mobile device) into the femtocell FAP. The terminal transmission / reception unit 226 transmits / receives femtocell radio waves (communication radio waves) for performing cellular communication with the terminal via the antenna ANT.

  The control unit 210 includes a pilot beacon transmission control unit 211 and a connected terminal number determination unit 212, and controls the entire femtocell FAP. The pilot beacon transmission control unit 211 controls the pilot beacon transmission unit 222 to control the start / stop of pilot beacon transmission. The connected terminal number determination unit 212 determines whether the number of terminals currently communicating using the femtocell exceeds the upper limit number of connected terminals.

  The storage unit 240 includes an upper limit connected terminal number storage unit 241 and a connected terminal number storage unit 242. The upper limit connection terminal number storage unit 241 stores the upper limit number of terminals that can communicate using femtocells. The connected terminal number storage unit 242 stores the number of terminals currently performing communication using the femtocell.

  The wired communication unit 250 is connected to a wide area network NET such as the Internet via a router or a general line (a broadband line such as ADSL).

  FIG. 12 is a flowchart illustrating an operation during transmission of a pilot beacon of the femtocell according to the second embodiment. The femtocell FAP repeats loop 3 (steps S31 to S36) while transmitting the pilot beacon.

  When the femtocell FAP receives a connection request from a terminal waiting at the communication frequency of its own station during pilot beacon transmission (YES in S32), the femtocell FAP establishes communication with the terminal (S33), and 1 is added to the number of connected terminals to be held (S34). In the connected terminal number determination unit 212, the number of terminals currently communicating using the femtocell (the number of connected terminals and the number of terminals to which a traffic channel is assigned) exceeds the preset upper limit number of connected terminals. (S35), if the number of connected terminals is larger than the upper limit number of connected terminals (YES in S35), the femtocell FAP stops the transmission of pilot beacons and makes other terminals no longer own (S37).

  If no connection request is received from the terminal waiting in step S32 (in the case of NO), and if the number of connected terminals is less than or equal to the upper limit number of connected terminals in S35 (in the case of NO), step S36 The process of loop 3 is continued, and transmission of the pilot beacon is continued.

  FIG. 13 is a flowchart for explaining the operation of the femtocell according to the second embodiment while the pilot beacon is stopped. The femtocell FAP repeats the loop 4 (steps S41 to S48) while the pilot beacon transmission is stopped.

  When the femtocell FAP releases the connection with the terminal communicating with the own station while the pilot beacon is stopped (YES in S42), the femtocell FAP subtracts 1 from the number of connected terminals held by the own station (S43). The connected terminal number determination unit 212 determines whether or not the number of terminals currently communicating using the femtocell (the number of connected terminals) exceeds the preset upper limit number of connected terminals (S44), When the number of connected terminals is less than or equal to the upper limit number of connected terminals (YES in S44), the femtocell FAP starts transmission of pilot beacons so that other terminals can handoff to the own station (S49). Further, when the connection with the terminal is not released at S42 (in the case of NO), and when the number of connected terminals is larger than the preset upper limit number of connected terminals at S44 (in the case of NO), the pilot beacon is stopped. When a connection request is received from a terminal waiting at the communication frequency of the local station (YES in S45), communication with the terminal is established (S46), and the number of connection terminals held by the local station is 1 Is added (S47).

  That is, the femtocell FAP counts the number of connected terminals even when the pilot beacon is stopped, repeatedly connects and releases with the terminal communicating with the femtocell FAP, and the number of connected terminals stops the pilot beacon. The pilot beacon transmission is not resumed until the upper limit number of connected terminals is reached.

  In the second embodiment, the upper limit number of connected terminals for determining the stop of the pilot beacon and the number of connected terminals for determining the restart of transmission of the pilot beacon are the same, but connection establishment and release are frequently performed. Since the number of connected terminals is likely to fluctuate in a relatively short time, the number of connected terminals for determination of transmission stop and transmission restart is different in order to prevent frequent repetition of pilot beacon transmission stop and transmission restart. It may be a value. That is, the femtocell FAP stops the pilot beacon when the number of connected terminals becomes equal to or greater than the stop determination connected terminal number X, and when the number of connected terminals becomes equal to or less than the restart determined connected terminal number Y (X> Y). You may make it restart transmission of a pilot beacon.

  Next, a third embodiment of the femtocell (base station) of the present invention will be described. FIG. 14 is a schematic block diagram illustrating a femtocell according to a third embodiment of the present invention. As shown in FIG. 14, the femtocell FAP includes an antenna ANT, a control unit 310 (control unit), a wireless communication unit 320, a communication environment measurement unit 330, a measurement timer 340, and a wired communication unit 350.

  The wireless communication unit 320 includes a pilot beacon transmission unit 322 (transmission unit) and a terminal transmission / reception unit 326. The pilot beacon transmission unit 322 transmits a pilot beacon for drawing a terminal (mobile device) into the femtocell FAP. The terminal transmission / reception unit 326 transmits / receives a femtocell radio wave (communication radio wave) for performing cellular communication with the terminal via the antenna ANT.

  The control unit 310 includes a pilot beacon transmission control unit 311 and a communication environment determination unit 312 and controls the entire femtocell FAP. The pilot beacon transmission control unit 311 controls the pilot beacon transmission unit 322 to control the start and stop of pilot beacon transmission. The communication environment determination unit 312 compares the measurement results of the communication environment of the macro cell and the femto cell.

  The communication environment measurement unit 330 measures the communication environment of the macro cell or the femto cell. The measurement timer 340 is a timer for counting intervals for measuring the communication environment.

  The wired communication unit 350 is connected to a wide area network NET such as the Internet via a router or a general line (a broadband line such as ADSL).

  FIG. 15 is a flowchart illustrating an operation during pilot beacon transmission of the femtocell according to the third embodiment. The femtocell FAP repeats the loop 5 (steps S51 to S57) while transmitting the pilot beacon. It is assumed that the measurement timer 340 is started when the processing of this flowchart is started.

  When the measurement timer 340 expires during pilot beacon transmission (YES in S52), the femtocell FAP measures the macrocell communication environment (for example, throughput) and the femtocell communication environment in the communication environment measurement unit 330. The communication environment determination unit 312 compares the measurement results of the communication environment of the macro cell AN and the femtocell FAP (S55). As a result, when the communication environment of the macro cell AN is better than the communication environment of the femtocell FAP (YES in S55), the femtocell FAP resets the measurement timer 340 (S56) and transmits a pilot beacon. By stopping, other terminals are prevented from handing off to the own station any more (S59). If the communication environment of the macro cell AN is worse than the communication environment of the femtocell FAP (NO in S55), the femtocell FAP resets the measurement timer 340 (S57) and continues to transmit pilot beacons. .

  The measurement of the communication environment of the macrocell AN or the femtocell FAP is performed by a test terminal connected to the femtocell FAP (not a terminal used by a user but a measurement terminal attached to the femtocell FAP). It shall be measured by trying to communicate using a base station.

  In the third embodiment, during the pilot beacon transmission, the communication environment is measured when the measurement timer expires. However, the measurement timing is not limited to this, and the femtocell FAP is used for standby and connection. Measurement may be performed when there are more terminals or when the number of terminals increases.

  FIG. 16 is a flowchart for explaining the operation of the femtocell according to the third embodiment while the pilot beacon is stopped. The femtocell FAP repeats loop 6 (steps S61 to S68) while stopping transmission of the pilot beacon. It is assumed that the measurement timer 340 is started when the processing of this flowchart is started.

  When the measurement timer 340 expires while the pilot beacon is stopped (YES in S62), the femtocell FAP determines the communication environment (eg, throughput) of the macrocell AN and the communication environment of the femtocell FAP in the communication environment measurement unit 330. Measurement is performed (S63, S64). As a result, when the communication environment of the femtocell FAP is better than the communication environment of the macrocell AN (YES in S65), the femtocell FAP resets the measurement timer 340 (S66) and transmits a pilot beacon. By resuming, another terminal can handoff to the own station (S69). When the communication environment of the macro cell AN is worse than that of the femtocell FAP (NO in S65), the femtocell FAP only resets the measurement timer 340 (S57).

  In the third embodiment, the femtocell FAP measures the communication environment when the measurement timer expires while the pilot beacon is stopped. However, the measurement timing is not limited to this, and the femtocell FAP waits for the femtocell FAP. Measurement may be performed when the number of connected terminals decreases or when the number of terminals is less than a certain number.

  Thus, according to the present invention, when the number of terminals waiting in the femtocell (base station) exceeds a certain number, or the number of terminals performing communication using the femtocell exceeds a certain number. If the communication performance when the communication is performed using the femtocell is worse than the communication performance when the communication is performed using the macrocell, the pilot beacon transmission is stopped. It is possible to prevent the terminal from being handed off to the femtocell in a crowded situation. Further, according to the present invention, since the transmission of the pilot beacon is appropriately controlled, it is possible to distribute the communication load between the macro cell and the femto cell while maintaining a good communication environment of the femto cell. Furthermore, interference with the macro cell can be prevented by refraining from transmitting a pilot beacon transmitted at the same frequency as the macro cell. Moreover, useless power consumption can be reduced by refraining from transmitting pilot beacons.

  In the above-described embodiment, CDMA2000 1xEVDO is assumed as the mobile communication system. However, the present invention is not limited to this, and for example, W-CDMA (Wideband Code Division Multiple Access), LTE (Long It can also be applied to systems such as Term Evolution) and UMB (Ultra Mobile Broadband).

DESCRIPTION OF SYMBOLS 100 Mobile communication system 110, 210, 310 Control part 111, 211, 311 Pilot beacon transmission control part 112 Terminal waiting number determination part 113 Handoff ESN determination part 120, 220, 320 Wireless communication part 122, 222, 322 Pilot beacon transmission part 126, 226, 326 Terminal transmission / reception unit 140, 240 Storage unit 141 Upper limit standby terminal number storage unit 142 Standby terminal number storage unit 143 Standby terminal ESN storage unit 150, 250, 350 Wired communication unit 212 Connected terminal number determination unit 241 Upper limit connection terminal Number storage unit 242 Connected terminal number storage unit 312 Communication environment determination unit 330 Communication environment measurement unit 340 Measurement timer ANT antenna AT1 to AT3 terminal (mobile device)
AN macrocell CN EV-DO core network FNG femtocell network gateway NET wide area network FAP femtocell F1 macrocell radio wave, pilot beacon F2 femtocell radio wave (communication radio wave)

Claims (9)

A transmission unit for transmitting broadcast information for causing the mobile station to detect its own station;
Recognizing the moving machine waiting to own station, when the mobile station is equal to or greater than a predetermined number, and a control section for controlling the transmission section to stop the transmission of the broadcast information,
A base station comprising: Wherein, in a state that stops transmission of the broadcast information, when it is detected that the mobile station is handed off to another base station, the transmission section to start transmission of the broadcast information The base station according to claim 1, wherein the base station is controlled. A transmission unit for transmitting broadcast information for causing the mobile station to detect its own station;
A control unit that controls the transmission unit to stop transmission of the broadcast information when the number of mobile devices connected to the local station exceeds a certain number by transmitting a connection request for establishing communication to the local station When,
A base station comprising: Wherein, in a state that stops transmission of the broadcast information, when it is detected that the mobile station is handed off to another base station, the transmission section to start transmission of the broadcast information The base station according to claim 3, wherein the base station is controlled. A transmission unit for transmitting broadcast information for causing the mobile station to detect its own station;
When the communication quality of the mobile station is worse than the communication quality of another base station, the base station and controls the transmission section to stop the transmission of the broadcast information. When the control unit detects that the communication quality of the local station is better than the communication quality of the other base station in a state where the transmission of the broadcast information is stopped, the control unit starts transmission of the broadcast information The base station according to claim 5, wherein the transmission unit is controlled. Base station transmits a broadcast information for detecting the moving machine own station,
The base station recognizes the mobile machine waiting to own station, when the mobile station becomes a predetermined number or more, a control method of a base station, wherein the benzalkonium to stop transmission of the broadcast information. Base station transmits a broadcast information for detecting the moving machine own station,
Wherein said base station, when the mobile station connected to the own station by sending a connection request for establishing communication to the own station is equal to or larger than a predetermined number, and Turkey to stop transmission of the broadcast information A base station control method. Base station transmits a broadcast information for detecting the moving machine own station,
Said base station, when the communication quality of the mobile station is worse than the communication quality of another base station, control method for a base station, wherein the benzalkonium to stop transmission of the broadcast information.

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