JP5498098B2 - Base station equipment - Google Patents

Description

  The present invention relates to a base station apparatus that communicates with a wireless communication terminal in a narrow area.

  In recent years, in wireless communication systems, a base station system called a femtocell, which covers a much smaller range than before, has been proposed. A conventional cell phone cell, that is, a range covered by one base station has a radius of about 1 km to several km, but a femto cell covers an area of about 10 m at most, such as in a house or a small office. is there. Femtocells are expected to become more popular in the future because they can provide a service range pinpoint and can be installed by individuals.

  Here, the conventional radio | wireless communications system which has a macrocell and a femtocell is demonstrated with reference to FIG. 26, FIG.

  The conventional wireless communication system shown in FIG. 26 and FIG. 27 includes femtocell base stations 90a and 90b that cover femtocells 9a and 9b, a macrocell base station 20 that covers a macrocell 8 including each femtocell, and The wireless communication network 11 is connected to the macrocell base station 20 and complies with “CDMA2000 1xEV-DO”.

  Further, the conventional wireless communication system shown in FIGS. 26 and 27 includes routers 23 and 22 connected to the femtocell base stations 90a and 90b, a public network 92 connected to these routers, a public network 92, and a wireless communication network 11, respectively. And a management server 91 connected to the gateway 24. The management server 91 has an OAM (Operation And Maintenance) function, and manages information related to the femtocells 9a and 9b and the femtocell base stations 90a and 90b, for example.

  Further, the wireless communication terminal 30 is permitted to communicate with the femtocell base station 90a. When the femtocell base station 90a is communicating with the wireless communication terminal 30, it is assumed that (1) the wireless communication terminal 30 goes out of the range of the femtocell 9a and (2) handoffs to the macrocell base station 20. Although there is no terminal permitted to communicate within the femtocell 9a, (3) transmission of radio waves from the femtocell base station 90a continues.

  For example, in a situation where a user of the wireless communication terminal 30 goes out to work or school in the daytime and there is no user in a house where the femtocell base station 90a is installed, the femtocell base station 90a Radio waves may continue to be transmitted, and in this situation, it can be said that it is a waste of power to continue transmitting radio waves to the wireless communication terminal 30 that the femtocell base station 90a is permitted.

  In response to such a problem, in Patent Document 1, when there is no communication within a certain time, the transmission function of the base station is stopped, and when the wireless communication terminal makes a call during this period, the wireless communication terminal By transmitting a transmission activation request signal to the station, the base station receives this signal, restarts the transmission function and enables communication with the wireless communication terminal, thereby stopping the transmission function, Some have been proposed that reduce power consumption.

JP 2002-152129 A

  The technique disclosed in Patent Document 1 described above is to stop the transmission function of the base station when there is no communication within a certain time in order to reduce the power consumption of the base station. In order to further reduce the power, it is preferable to stop the transmission function and the reception function. However, if the reception function is also stopped, it becomes impossible to receive the transmission activation request signal from the wireless communication terminal, and it becomes impossible to restart the transmission function. could not.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a base station apparatus that can perform more efficient power consumption than conventional ones.

In order to achieve the above object, the present invention provides a wireless communication that is an object of accommodation in a base station apparatus that constitutes a narrow base station that can communicate in a narrow area within a wide area that can communicate with a wide base station. A wireless communication receiving unit for receiving radio waves from a terminal, a wireless communication transmitting unit for transmitting radio waves to a wireless communication terminal to be accommodated, a control unit for controlling reception of radio waves by the wireless communication receiving unit , and others the wireless communication terminal accommodating subject in communication with the base station of, and a determining unit based on the non-line area information indicating whether or not are within the area of the same wireless area information and the own base station, the When the determination unit determines that the wireless communication terminal is not in the same area of the wireless area information as the own base station, the control unit stops the wireless communication reception unit and the wireless communication transmission unit, The determination unit If the communication terminal is determined to have in the area of the same wireless area information and the own base station, the control unit is configured to start the reception of radio waves from the wireless communication terminal to said radio communication receiving unit, said wireless communication When the transmission wave from the terminal is received and demodulation is possible, the wireless communication transmission unit is started .

Wherein the control unit, the wireless area information, preferably retrieve via the other base stations from the wireless communication terminal accommodating subject in communication with the wireless communication terminal.

Further, the control unit, the wireless area information, Contain the it is preferable to acquire the wireless communication terminal and to manage other base station communicating Rusa over bar or al.

  According to the present invention, since the femtocell base station starts monitoring the transmission wave of the wireless communication terminal when the wireless communication terminal approaches the femtocell, the transmission is performed even when the wireless communication terminal is at a remote location of the femtocell. More efficient power consumption can be achieved than when monitoring waves.

It is a block diagram of the radio | wireless communications system which concerns on 1st Example of this invention. It is a block diagram of a femtocell base station. It is a block diagram of a radio | wireless communication terminal. It is a figure explaining the state transition of a femtocell base station. It is a sequence diagram which shows the detail of operation | movement when a femtocell base station is in a preparation phase. It is a figure explaining operation | movement of the radio | wireless communications system when a femtocell base station is in a standby phase. It is a sequence diagram which shows the detail of operation | movement when a femtocell base station is a standby phase. It is a figure which shows the information of a UATI update notification. It is a flowchart of a UATI determination process. It is a figure explaining operation | movement of the radio | wireless communications system when a femtocell base station is a monitoring phase. It is a sequence diagram which shows the detail of operation | movement when a femtocell base station is a monitoring phase. It is a figure which shows the example of MI. It is a figure which shows the example of MQ. It is a block diagram of the radio | wireless communications system which concerns on 2nd Example of this invention. It is a block diagram of a femtocell base station. It is a block diagram of a management server. It is a sequence diagram which shows the detail of operation | movement when a femtocell base station is in a preparation phase. It is a figure explaining operation | movement of the radio | wireless communications system when a femtocell base station is in a standby phase. It is a sequence diagram which shows the detail of operation | movement when a femtocell base station is a standby phase. It is a figure which shows the information of a UATI update notification. It is a flowchart of a UATI transmission process. It is a figure which shows the information of a UATI acquisition notification. It is a figure explaining operation | movement of the radio | wireless communications system when a femtocell base station is a monitoring phase. It is a sequence diagram which shows the detail of operation | movement when a femtocell base station is a monitoring phase. It is a sequence diagram at the time of receiving the UATI acquisition notification of all the registered wireless communication terminals. It is a figure explaining the conventional radio | wireless communications system. It is a figure explaining the conventional radio | wireless communications system.

Embodiments of the present invention will be described with reference to the drawings.
<First embodiment>
FIG. 1 is a configuration diagram of a radio communication system according to a first embodiment of the present invention. The radio communication system shown in FIG. 1 includes a macro cell base that covers a macro cell 8 (wide area) including femto cell base stations 10a and 10b and femto cells 9a and 9b (narrow area) that cover the femto cells 9a and 9b, respectively. And a radio communication network 26 connected to the macro cell base station 20. In this embodiment, the wireless communication network 26 conforms to “CDMA2000 1xEV-DO”. In addition, when distinguishing each femtocell base station, it describes as femtocell base station 10a, 10b, and when not distinguishing each femtocell base station, it describes as femtocell base station 10.

Further, the wireless communication system shown in FIG. 1 includes routers 23 and 22 connected to the femtocell base stations 10a and 10b, femtocell user contracted lines 25 and femtocell user contracted lines 25 connected to the routers 23 and 22, respectively. And a gateway 24 connected to the wireless communication network 26 and a management server 40 connected to the gateway 24. The management server 40 has an OAM (Operation And Maintenance) function, and manages, for example, information about the femtocells 9a and 9b and the femtocell base stations 10a and 10b.
In addition, the wireless communication terminal 30 is permitted to communicate with the femtocell base station 10a and is an accommodation target of the femtocell base station 10a.

FIG. 2 is a block diagram of the femtocell base station. The femtocell base station 10 includes a wireless communication transmitter 11, a wireless communication receiver 12, a UATI (Unicast Access terminal identifier) determination unit 13, a wired communication unit 14, a storage unit 15, and a control unit 16. ing. The wireless communication transmission unit 11 transmits radio waves to the wireless communication terminal that is the accommodation target. The wireless communication receiving unit 12 receives radio waves from a wireless communication terminal that is an accommodation target. The wired communication unit 14 communicates with the macro cell base station 20 and the management server 40. The UATI determination unit 13 determines whether or not the wireless communication terminal communicating with the macrocell base station 20 is in the same wireless area information area as the femtocell base station 10 through the wired communication unit 14. Determine based on.
The storage unit 15 is configured by a storage medium such as a flash memory or a hard disk, and the control unit 16 is configured by a CPU or the like.

  The control unit 16 registers in advance the identification information (such as ESN) of the wireless communication terminal that is the accommodation target in the storage unit 15. In addition, the control unit 16 registers peripheral base station information related to the macro cell base station 20 around the femtocell base station 10 in the storage unit 15.

  The control unit 16 controls transmission of radio waves by the wireless communication transmission unit 11 and monitoring of radio waves by the wireless communication reception unit 12. When the UATI determination unit 13 determines that the wireless communication terminal to be accommodated is within the same area of the wireless area information as the femtocell base station 10, the control unit 16 sends the wireless communication reception unit 12 from the wireless communication terminal. Start receiving radio waves. Further, when the UATI determination unit 13 determines that the wireless communication terminal to be accommodated is not in the area of the same wireless area information as that of the femtocell base station 10, the wireless communication terminal that is registered (waiting) When there is no signal, the control unit 16 causes the wireless communication receiving unit 12 to stop receiving radio waves from the wireless communication terminal.

  FIG. 3 is a block diagram of the wireless communication terminal. The wireless communication terminal 30 includes a message creation unit 33, a wireless communication unit 34, a storage unit 35, and a control unit 36. When the wireless communication terminal 30 acquires UATI from the macrocell base station (when the location is registered), the message creation unit 33 sends a message for performing a UATI update notification to the femtocell base station 10 via the wireless communication network 26. create. The wireless communication unit 34 is an interface for communicating with the femtocell base station 10 and the macrocell base station 20. The storage unit 35 is configured by a storage medium such as a hard disk or a flash memory, and the control unit 36 is configured by a CPU or the like.

  Next, the operation of the femtocell base station according to the first embodiment will be described. FIG. 4 is a diagram illustrating state transition of the femtocell base station. As shown in FIG. 4, the operation of the femtocell base station according to the first embodiment is divided into a preparation phase, a standby phase, a monitoring phase, and a base station operation phase.

<Preparation phase>
FIG. 1 is a diagram for explaining the operation of the wireless communication system when the femtocell base station is in the preparation phase. As shown in FIG. 1, the femtocell base station 10a acquires and registers identification information (such as ESN) of the wireless communication terminal 30 that is permitted to communicate with the femtocell base station 10a. Further, the femtocell base station 10 a notifies the management server 40 of identification information (such as ESN) of the wireless communication terminal 30. Further, the femtocell base station 10 a registers the peripheral base station information of the macrocell base station 20 in the vicinity of the femtocell base station 10 a in the storage unit 15.

Next, details of the operation when the femtocell base station is in the preparation phase are shown in FIG. 5 as a sequence diagram.
The femtocell base station 10a has a function of monitoring the macrocell base station included in the femtocell base station 10a and the surrounding femtocell base stations, thereby enabling the macrocell base station and the surrounding femtocell base stations around the femtocell base station 10a to Broadcast information is acquired (S101). Further, the femtocell base station 10a acquires the identification information (ESN or the like) of the permitted wireless communication terminal 30 from the wireless communication terminal 30, and registers the acquired information (S102). Here, the radio communication terminal 30 is an accommodation target of the femtocell base station 10a. Further, the femtocell base station 10a requests the radio communication terminal 30 to acquire broadcast information from the macro cell base station 20 around the femtocell base station 10a and the surrounding femtocell base stations (S103). The broadcast information of neighboring base stations may be acquired from (S104). The broadcast information is, as a specific example, BandClass, Channel, and PN necessary for monitoring, and ColorCode and SectorID necessary for demodulation. Note that the femtocell base station 10 is time-synchronized with the macro cell base station 20 in the vicinity by GPS or NTP, and is synchronized when demodulating.

<Standby phase>
FIG. 6 is a diagram for explaining the operation of the wireless communication system when the femtocell base station is in the standby phase. At the stage of the standby phase, the femtocell base station 10a is in a state in which the wireless communication transmitting unit 11 and the wireless communication receiving unit 12 are stopped and the wired communication unit 14 is activated to wait for a UATI acquisition notification.
When the wireless communication terminal 30 acquires a UATI (Unicast Access terminal identifier) from the macrocell base station 20, the wireless communication terminal 30 notifies the femtocell base station 10a of the update of the UATI via the wireless communication network. When the femtocell base station 10a receives the UATI update notification, the ColorCode (information that can identify the wireless communication area: wireless area information) included in the UATI update notification information exists around the femtocell base station 10a. If the color code of the macro cell base station is set, the process proceeds to the monitoring phase described later.

Next, details of the operation when the femtocell base station is in the standby phase are shown in FIG. 7 as a sequence diagram.
The wireless communication terminal 30 acquires the UATI from the macro cell base station 20 (S201), and when there is an EV-DO session with the macro cell base station 20 (Yes in S202), or performs an EV-DO session acquisition request. (S204) When the EV-DO session acquisition with the macrocell base station 20 is successful (Yes in S205), the femtocell base station 10a is connected via the wireless communication network 26, the gateway 24, and the femtocell user contract line 25. A UATI update notification is sent to (S203, S206). The operations in steps S201 to S203 are assumed to be operations related to location registration during handoff, and the operations in steps S204 to S206 are assumed to be operations related to location registration. FIG. 8 shows information on the UATI update notification, and the UATI update notification includes base station information of the macro cell base station, ColorCode, SectorID, identification information (such as ESN) of the wireless communication terminal 30, and UATI.

  When the femtocell base station 10a receives the UATI update notification, the femtocell base station 10a performs UATI determination processing (S207). FIG. 9 is a flowchart of the UATI determination process. The femtocell base station 10a, based on the ColorCode of the UATI update notification information, and the ColorCode of the peripheral base station information registered in the storage unit 15, the neighboring macrocell base station of the femtocell base station 10a and the peripheral femtocells. It is determined whether or not the UATI is acquired from the base station (S208). If the femtocell base station 10a is found to be a UATI acquired from a macrocell base station in the vicinity of the femtocell base station 10a or a neighboring femtocell base station (Yes in S208), the monitoring described later The process proceeds to the phase (S209). If the femtocell base station 10a is a UATI acquired from a macro cell base station or a femtocell base station that does not exist in the vicinity (No in S208), the UATI determination process is terminated and the standby phase is maintained.

<Monitoring phase>
FIG. 10 is a diagram for explaining the operation of the wireless communication system when the femtocell base station is in the monitoring phase. In the stage of the monitoring phase, the femtocell base station 10a stops the wireless communication transmitting unit 11 and starts the wireless communication receiving unit 12 and the wired communication unit 14. In the monitoring phase, the femtocell base station 10a activates the wireless communication receiving unit 12 and starts monitoring the wireless communication terminal 30.

  FIG. 11 is a sequence diagram showing details of the operation when the femtocell base station is in the monitoring phase. As shown in FIG. 11, when the radio communication terminal 30 and the macro cell base station 20 are communicating (S301), the femtocell base station 10a receives a transmission wave from the radio communication terminal 30 to the macro cell base station 20. (Monitor) (S302). Next, UATI is extracted from the received transmission wave and demodulated based on UATI (S303). If demodulation is possible (Yes in S304), the transmission wave is transmitted from the wireless communication terminal 30 that is permitted to communicate, and therefore the process proceeds to a base station operation phase described later (S305). If demodulation is not possible (No in S304), reception of transmission waves from the radio communication terminal 30 is further continued.

  The femtocell base station 10a demodulates the transmission wave of the wireless communication terminal 30 based on MI and MQ. FIG. 12 shows an example of MI, and FIG. 13 shows an example of MQ. A0 to A31 in FIG. 12 and FIG. 13 indicate the acquired UATI bits.

  The operations described in FIGS. 7 and 9 are performed in the standby phase, but are also performed in the monitoring phase. In the monitoring phase, the state of the monitoring phase is maintained when Yes in step S208 of FIG. 9, and there is no wireless communication terminal that is registered (standby) when No in step S208 of FIG. If so, the process proceeds to the standby phase.

<Base station operation phase>
In the base station operation phase, the femtocell base station 10a activates the wireless communication transmitting unit 11, the wireless communication receiving unit 12, and the wired communication unit 14.
In the base station operation phase, the femtocell base station 10a activates the wireless communication transmission unit 11 to start radio wave transmission, and operates as a base station. When there is no standby wireless communication terminal 30, the process proceeds to the monitoring phase described above.

  As described above, the femtocell base station according to the first embodiment starts the monitoring of the transmission wave of the wireless communication terminal when the wireless communication terminal permitted to communicate is in the vicinity of the femtocell. Even when the communication terminal is in a remote place of the femtocell, more efficient power consumption can be performed than when the transmission wave is monitored.

<Second embodiment>
FIG. 14 is a configuration diagram of a radio communication system according to the second embodiment of the present invention. Of the elements constituting the wireless communication system according to the second embodiment, the same elements as those according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The radio communication system shown in FIG. 14 includes a macro cell base that covers a macro cell 8 (wide area) including femto cell base stations 50a and 50b and femto cells 9a and 9b (narrow area) that cover the femto cells 9a and 9b, respectively. And a radio communication network 26 connected to the macro cell base station 20. In this embodiment, the wireless communication network 26 conforms to “CDMA2000 1xEV-DO”. In addition, when distinguishing each femtocell base station, it describes as femtocell base station 50a, 50b, and when not distinguishing each femtocell base station, it describes as femtocell base station 50.

Further, the wireless communication system shown in FIG. 14 includes routers 23 and 22 connected to the femtocell base stations 50a and 50b, femtocell user contracted lines 25 and femtocell user contracted lines 25 connected to the routers 23 and 22, respectively. And a gateway 24 connected to the wireless communication network 26 and a management server 60 connected to the gateway 24. The management server 60 has an OAM (Operation And Maintenance) function, and manages information related to the femtocells 9a and 9b and the femtocell base stations 50a and 50b, for example.
Further, the wireless communication terminal 30 is permitted to communicate with the femtocell base station 50a and is an accommodation target of the femtocell base station 10a.

FIG. 15 is a block diagram of a femtocell base station. The femtocell base station 50 includes a wireless communication transmission unit 11, a wireless communication reception unit 12, a UATI determination unit 13, a wired communication unit 14, a storage unit 15, a control unit 16, and a macro cell monitoring unit 17. Yes. The wireless communication transmission unit 11 transmits radio waves to the wireless communication terminal that is the accommodation target. The wireless communication receiving unit 12 receives radio waves from a wireless communication terminal that is an accommodation target. The wired communication unit 14 communicates with the macrocell base station 20 or the management server 40. The UATI determination unit 13 determines whether or not the wireless communication terminal communicating with the macrocell base station 20 is in the same wireless area information area as the femtocell base station 10 through the wired communication unit 14. Determine based on. The macro cell monitoring unit 17 monitors the macro cell base stations 20 around the femtocell base station 10 and acquires peripheral base station information related to the macro cell base station 20.
The storage unit 15 is configured by a storage medium such as a flash memory or a hard disk, and the control unit 16 is configured by a CPU or the like.

  The control unit 16 registers in advance the identification information (such as ESN) of the wireless communication terminal that is the accommodation target in the storage unit 15. In addition, the control unit 16 registers peripheral base station information related to the macro cell base station 20 around the femtocell base station 10 in the storage unit 15.

  The control unit 16 controls transmission of radio waves by the wireless communication transmission unit 11 and monitoring of radio waves by the wireless communication reception unit 12. When the UATI determination unit 13 determines that the wireless communication terminal to be accommodated is within the same area of the wireless area information as the femtocell base station 10, the control unit 16 sends the wireless communication reception unit 12 from the wireless communication terminal. Start receiving radio waves. If the UATI determination unit 13 determines that the wireless communication terminal to be accommodated is not in the area of the same wireless area information as the femtocell base station 10, the control unit 16 performs wireless communication with the wireless communication reception unit 12. Stop receiving radio waves from the device.

  FIG. 16 is a block diagram of the management server. The management server 60 includes a UATI transmission unit 43, a wired communication unit 44, a storage unit 45, and a control unit 46. The UATI transmission unit 43 determines the femtocell base station 50a registered with the wireless communication terminal based on the identification information (ESN) of the wireless communication terminal and transmits a UATI acquisition notification to the determined femtocell base station 50a. . The wired communication unit 44 communicates with the macrocell base station 20 and the femtocell base station 10. The storage unit 45 is configured by a storage medium such as a hard disk or a flash memory, and the control unit 46 is configured by a CPU or the like.

  Next, the operation of the femtocell base station according to the second embodiment will be described. As with the first embodiment, the operation of the femtocell base station according to the second embodiment is divided into four phases: a preparation phase, a standby phase, a monitoring phase, and a base station operation phase.

<Preparation phase>
FIG. 14 is a diagram for explaining the operation of the wireless communication system when the femtocell base station is in the preparation phase. As shown in FIG. 14, the femtocell base station 50a acquires and registers identification information (such as ESN) of the wireless communication terminal 30 that is permitted to communicate with the femtocell base station 50a. Further, the femtocell base station 50 a registers identification information (such as ESN) of the wireless communication terminal 30 in the management server 60. Further, the femtocell base station 50 a registers the peripheral base station information of the macrocell base station 20 around the femtocell base station 50 a in the storage unit 15.

Next, details of the operation when the femtocell base station is in the preparation phase are shown in FIG. 17 as a sequence diagram.
The femtocell base station 50a registers the femtocell registration information in the management server 60 (S401). The femtocell registration information registered in the server 60 is identification information and an IP address of the femtocell base station 50a.

  The femtocell base station 50a has a function of monitoring the macrocell base station provided in the femtocell base station 50a and the surrounding femtocell base stations, thereby enabling the macrocell base station and the surrounding femtocell base stations in the vicinity of the femtocell base station 50a. The broadcast information is acquired and registered in the storage unit 15 (S402), and the acquired broadcast base station information is notified to the management server 60 (S403). The management server 60 may acquire the notification information of the peripheral base station from the peripheral base station, and the femtocell base station 50a may acquire the notification information of the peripheral base station from the management server 40. The broadcast information is, as a specific example, BandClass, Channel, and PN necessary for monitoring, and ColorCode and SectorID necessary for demodulation. Note that the femtocell base station 50 is time-synchronized with the macrocell base station 20 in the vicinity by GPS or NTP, and is synchronized when demodulating.

  The femtocell base station 50a acquires the identification information (ESN or the like) of the wireless communication terminal 30 permitted to communicate from the wireless communication terminal 30, and registers the acquired information (S404). Here, the radio communication terminal 30 is an accommodation target of the femtocell base station 50a. Further, the femtocell base station 50a registers the registered identification information (such as ESN) of the wireless communication terminal 30 in the management server 60 (S405). At this time, the management server 60 associates the identification information of the wireless communication terminal 30 with the femtocell base station 50a.

<Standby phase>
FIG. 18 is a diagram for explaining the operation of the wireless communication system when the femtocell base station is in the standby phase. In the standby phase stage, the femtocell base station 50a is in a state of stopping the wireless communication transmitting unit 11 and the wireless communication receiving unit 12, starting the wired communication unit 14, and waiting for a UATI acquisition notification.
The management server 60 acquires the UATI information acquired by the wireless communication terminal 30 by a notification from the wireless communication network 26 to which the macrocell base station or the surrounding femtocell base station belongs, or an acquisition request to the wireless communication network 26. Then, the registered femtocell base station 50a of the wireless communication terminal 30 is determined based on the identification information (ESN) of the wireless communication terminal 30, and UATI is transmitted to the femtocell base station 50a.

Next, FIG. 19 shows the details of the operation when the femtocell base station is in the standby phase as a sequence diagram.
The macro cell base station 20 acquires a UATI from the macro cell base station 20 (S501) when the wireless communication terminal 30 has an EV-DO session with the wireless communication terminal 30 (Yes in S502), or an EV-DO session. (S504), and when the EV-DO session acquisition with the wireless communication terminal 30 is successful (Yes in S505), the UATI is notified to the management server 60 via the wireless communication network 26 ( S503, S506). Note that the operations in steps S501 to S503 are assumed to be operations related to location registration during handoff, and the operations in steps S504 to S506 are assumed to be operations related to location registration. FIG. 20 shows information on the UATI update notification, and the UATI update notification includes base station information of the macro cell base station, ColorCode, SectorID, identification information (such as ESN) of the wireless communication terminal 30, and UATI.
When receiving the UATI update notification, the management server 60 performs UATI transmission processing (S507).

FIG. 21 shows a flowchart of the UATI transmission process. Upon receiving the UATI update notification, the management server 60 determines the registered femtocell base station 50a of the wireless communication terminal 30 based on the identification information (ESN) of the wireless communication terminal 30 (S601). When the femtocell base station 50a has been determined (Yes in S602), the management server 60 transmits a UATI acquisition notification to the femtocell base station 50a (S603). If the femtocell base station 50a is not determined (No in S602), the process ends.
FIG. 22 shows information of the UATI acquisition notification. The UATI acquisition notification includes the color code of the macro cell base station, the identification information (such as ESN) of the wireless communication terminal 30, and the UATI.

  When the femtocell base station 50 a receives the UATI acquisition notification, the femtocell base station 50 a, based on the ColorCode of the UATI acquisition notification information and the ColorCode of the neighboring base station information registered in the storage unit 15, If it is determined whether the UATI is acquired from a base station or a nearby femtocell base station, and it is found that the UATI is acquired from a neighboring macrocell base station or a neighboring femtocell base station (in S509) In the case of Yes), the process proceeds to the monitoring phase described later (S510).

<Monitoring phase>
FIG. 23 is a diagram for explaining the operation of the wireless communication system when the femtocell base station is in the monitoring phase. In the monitoring phase, the femtocell base station 50a stops the wireless communication transmission unit 11 and starts the wireless communication reception unit 12 and the wired communication unit 14. In the monitoring phase, the femtocell base station 50a activates the wireless communication receiving unit 12 and starts monitoring the wireless communication terminal 30.

  FIG. 24 is a sequence diagram showing details of the operation when the femtocell base station is in the monitoring phase. As shown in FIG. 24, when the radio communication terminal 30 and the macro cell base station 20 are communicating (S701), the femtocell base station 50a receives a transmission wave from the radio communication terminal 30 to the macro cell base station 20. Yes (monitor) (S702). Next, UATI is extracted from the received transmission wave, and demodulation is performed based on UATI (S703). When demodulation is possible, it is a transmission wave from the wireless communication terminal 30 permitted to communicate. If demodulation is possible and the ColorCode is near (Yes in S704), the process proceeds to the base station operation phase (S705). If demodulation is not possible (No in S704), reception of transmission waves from the wireless communication terminal 30 is further continued.

  FIG. 25 is a sequence diagram when receiving UATI acquisition notifications of all registered wireless communication terminals. The operations from S801 to S803 are the same as the operations from S701 to S703 in FIG. As shown in FIG. 25, the femtocell base station 50a receives the UATI acquisition notification of all the wireless communication terminals registered from the management server 60 that manages the femtocell in the monitoring phase (S804), and is registered in the neighborhood. If it is determined that there is no wireless communication terminal (Yes in S805), monitoring of the wireless communication terminal 30 is stopped and the process proceeds to the standby phase (S806).

  The femtocell base station 50a demodulates the transmission wave of the wireless communication terminal 30 based on MI and MQ. FIG. 12 shows an example of MI, and FIG. 13 shows an example of MQ. A0 to A31 in FIG. 12 and FIG. 13 indicate the acquired UATI bits.

<Base station operation phase>
In the base station operation phase, the femtocell base station 50a activates the wireless communication transmitting unit 11, the wireless communication receiving unit 12, and the wired communication unit 14.
In the base station operation phase, the femtocell base station 50a activates the wireless communication transmission unit 11 to start transmission of radio waves, and operates as a base station. When there is no standby wireless communication terminal 30, the process proceeds to the monitoring phase described above.

  As described above, the femtocell base station according to the second embodiment starts the monitoring of the transmission wave of the wireless communication terminal when the wireless communication terminal permitted to communicate is in the vicinity of the femtocell. Even when the communication terminal is in a remote place of the femtocell, more efficient power consumption can be performed than when the transmission wave is monitored.

8 Macrocell 9a, 9b Femtocell 10a, 10b, 50a, 50b Femtocell base station 11 Wireless communication transmitter 12 Wired communication receiver 13 UATI determination unit 14 Wired communication unit 15, 35, 45 Storage unit 16, 36, 46 Control unit DESCRIPTION OF SYMBOLS 17 Macrocell monitoring part 20 Macrocell base station 22, 23 Router 24 Gateway 25 Femtocell user contract line 26 Wireless communication network 30 Wireless communication terminal 33 Message preparation part 34 Wireless communication part 40, 60 Management server 43 UATI transmission part 44 Wired communication part

Claims (3)

In a base station apparatus constituting a narrow area base station capable of communicating in a narrow area within a wide area capable of communicating with a wide area base station,
A wireless communication receiver that receives radio waves from a wireless communication terminal to be accommodated;
A wireless communication transmitter that transmits radio waves to a wireless communication terminal to be accommodated;
A control unit for controlling reception of radio waves by the wireless communication receiving unit ;
The wireless communication terminal accommodating subject in communication with other base stations, and a determining unit based on the non-line area information indicating whether or not are within the area of the same wireless area information and the own base station,
When the determination unit determines that the wireless communication terminal is not in the same area of the wireless area information as its own base station, the control unit stops the wireless communication reception unit and the wireless communication transmission unit,
When the determination unit determines that the wireless communication terminal is in the same area of the wireless area information as the base station, the control unit receives radio waves from the wireless communication terminal to the wireless communication reception unit. The base station apparatus is characterized by starting the wireless communication transmission unit when receiving a transmission wave from the wireless communication terminal and enabling demodulation . Wherein, the base according to claim 1, characterized in that Tokusuru the wireless area information, taken from the radio communication terminal accommodating subject via the other base station communicating with the wireless communication terminal Station equipment. Wherein, the base according to claim 1, characterized in that Tokusuru the wireless area information, collected by the management to salicylate over server or al the other base station communicating with the radio communication terminal accommodating target Station equipment.

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