JP5618072B2 - Wireless communication system, wireless communication apparatus, and wireless communication method - Google Patents

Wireless communication system, wireless communication apparatus, and wireless communication method Download PDF

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JP5618072B2
JP5618072B2 JP2010225034A JP2010225034A JP5618072B2 JP 5618072 B2 JP5618072 B2 JP 5618072B2 JP 2010225034 A JP2010225034 A JP 2010225034A JP 2010225034 A JP2010225034 A JP 2010225034A JP 5618072 B2 JP5618072 B2 JP 5618072B2
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base station
mobile station
station
reception level
femto base
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JP2012080410A (en
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基樹 森田
基樹 森田
松永 泰彦
泰彦 松永
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日本電気株式会社
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24Cell structures
    • H04W16/32Hierarchical cell structures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/04Reselecting a cell layer in multi-layered cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/08Closed loop power control

Description

  The present application relates to a wireless communication system, a wireless communication apparatus, and a wireless communication method.

In recent years, with the spread of mobile phones, wireless communication systems mainly composed of macro base stations installed outdoors and femto base stations installed indoors have been studied. A macro base station is a base station that forms a wide range of macro cells with a radius of several kilometers, and is mainly connected to mobile stations located outdoors. On the other hand, the femto base station is a base station that forms a narrow femtocell having a radius of about several tens of meters, and is mainly connected to a mobile station indoors. This femto base station is being studied as an area coverage measure that is difficult for radio waves from a macro base station to reach, mainly indoors.
As a technique for controlling the coverage of a femto base station, for example, there is Patent Document 1. The femto base station described in Patent Literature 1 measures the reception quality for the macro base station, and adds a predetermined power offset to determine the initial value of the reference signal transmission power and the maximum value of the transmission power. . Then, the femto mobile station permitted to communicate with the femto base station measures the reception quality for the femto base station, and reports the measurement result to the femto base station periodically or when a predetermined condition is satisfied. The femto base station adjusts the transmission power so as to approach a predetermined target value based on the reported measurement result.

International Publication WO2009 / 047972

  In the above technique, the communication area (coverage) of the femto base station is adjusted using the target value of the reception quality. However, the femto base station coverage may be drastically reduced during operation. For example, when the target value of the reception quality is set to be too low, reports of reception quality measurement results are not collected sufficiently. As a result of the reduced coverage, the mobile station may move to a location where it is desired to communicate with the femto base station with sufficient communication quality, but may be located outside the coverage range of the femto base station. It will continue to connect with the station.

  Therefore, the problem to be solved by the present invention is to solve the above-mentioned problem, and according to the measurement result of the mobile station, the communication area of the base station is set so that the mobile station can communicate with an appropriate base station. It is to provide expanding technology.

A wireless communication system according to the present invention for solving the above-described problems is composed of a first base station, a second base station, and a mobile station that can be connected to both the first and second base stations. that a wireless communication system, the mobile station, said means for measuring the reception level of the signal to be transmitted, means for positioning the location information of the mobile station, and the reception level from the first base station and means for transmitting the location information to the second base station, the second base station determines whether the mobile station is present within said first predetermined distance from the base station, a predetermined When within the distance, the radio base station has a control unit that creates a radio parameter change request for the first base station according to the reception level and transmits the request to the first base station. , According to the radio parameter change request received from the second base station. Characterized in that it has a control means for changing the radio parameter Te.
In order to solve the above problems, a base station of the present invention provides a predetermined distance from a first base station in which the mobile station is a base station other than the base station based on position information of the mobile station measured by the mobile station. When the mobile station is within the predetermined distance, the mobile station wirelessly transmits the radio signal of the first base station according to a reception level obtained by measuring a signal transmitted from the first base station. Control means for creating a parameter change request and transmitting the request to the first base station.

  The control device of the present invention for solving the above-described problem is based on the position information of the mobile station measured by the mobile station, from the first base station that is a base station other than the base station to which the mobile station is connected. If the mobile station is within the predetermined distance, the mobile station determines the first base according to the reception level obtained by measuring the signal transmitted from the first base station. Control means for expanding the communication area of the station is provided.

The present invention for solving the above-described problem is a radio parameter change request generation method in a base station , wherein the mobile station is a first one other than the mobile station based on the location information of the mobile station that is positioned by the mobile station. It is determined whether the mobile station is within a predetermined distance from the base station.When the mobile station is within the predetermined distance, the mobile station measures the signal transmitted from the first base station, A creation step of creating a radio parameter change request of the first base station, and a transmission step of transmitting the created radio parameter change request to the first base station .

  According to the present invention, since the communication area of the base station is expanded according to the measurement result of the mobile station, the mobile station can communicate with an appropriate base station.

FIG. 1 is a schematic diagram of a wireless communication system according to the present invention. FIG. 2 is a block diagram showing a configuration example of the mobile station of the present invention. FIG. 3 is a block diagram showing a configuration example of the macro base station of the present invention. FIG. 4 is a block diagram illustrating a configuration example of a femto base station according to the present invention. FIG. 5 is a flowchart of the operation of the first embodiment of the present invention. FIG. 6 is a flowchart of the operation of the second exemplary embodiment of the present invention. FIG. 7 is a block diagram illustrating a configuration example of a femto base station according to the third embodiment of this invention. FIG. 8 is a flowchart of the operation of the third embodiment of the present invention. FIG. 9 is a flowchart of the operation of the fourth exemplary embodiment of the present invention. FIG. 10 is a schematic diagram of the wireless communication system of the present invention.

  The communication system of the present invention includes a femto base station, a macro base station, and a mobile station that can be connected to both the femto base station and the macro base station.

  The mobile station measures the reception level of the reference signal from the femto base station in accordance with at least one of the instruction from the macro base station or the femto base station management server and the position of the mobile station. Then, the mobile station transmits the measurement result to the macro base station.

  The macro base station or the femto base station management server connected to the macro base station via the network performs control to expand the communication area (coverage) of the femto base station according to the measurement result.

  In order to explain the details of the present invention, it will be specifically described below with reference to the drawings.

(First embodiment)
First, the first embodiment will be described. In the first embodiment, a configuration for measuring a reception level from a femto base station will be described.

  FIG. 1 is a schematic diagram showing a communication system of the present invention. The communication system of the present invention includes a mobile station (User Equipment) 10, a macro base station 20, and a femto base station 30. Note that the mobile station 10 in the following description will be described as a mobile station that is permitted to communicate with the femto base station 30.

  FIG. 2 is a block diagram of the mobile station 10.

  The mobile station 10 includes a radio communication control unit 110, a downlink control signal reproduction unit 120, a control unit 130, and an uplink control signal generation unit 140.

  The wireless communication control unit 110 controls wireless communication with the macro base station 20 or the femto base station 30.

  The downlink control signal reproduction unit 120 extracts necessary control information from the reference signals and various control signals received by the wireless communication control unit 110 from the macro base station 20 or the femto base station 30. When a measurement request signal is transmitted from the macro base station to the mobile station using DCCH (Dedicated Control Channel), the downlink control signal reproduction unit 120 extracts the measurement request signal.

  The control unit 130 includes a measurement unit 131. When the measurement unit 131 receives the measurement request signal from the downlink control signal reproduction unit 120, the measurement unit 131 measures the reception level of the reference signal transmitted by the femto base station 30. The reception level measured by the measurement unit 131 is at least one of received signal strength (RSRP: Reference Signal Received Power) and received signal quality (RSRQ: Reference Signal Received Quality). The condition for stopping the measurement is when a measurement stop signal instruction is received from the macro base station via the DCCH, or when a measurement result is reported a certain number of times.

  The uplink control signal generation unit 140 uses the measurement report in the DCCH to obtain the identification information of the base station with which the local station can communicate and the measurement result of the reception level corresponding to each base station (or cell). Send to. The identification information of the base station also includes the identification information of the femto base station that is registered and can be connected. Hereinafter, this is referred to as registered femto base station information. The measurement result is transmitted when the measurement unit 131 is measuring.

  FIG. 3 is a block diagram of the macro base station 20. The macro base station 20 includes a wireless communication control unit 210, an uplink control signal reproduction unit 220, a control unit 230, a downlink control signal generation unit 240, and a wired communication control unit 250.

  The wireless communication control unit 210 controls wireless communication with the mobile station 10.

  When the registered femto base station information is described in the DCCH transmitted from the mobile station 10, the uplink control signal reproduction unit 220 extracts the registered femto base station information and passes it to the control unit 230. In addition, the measurement value is extracted from the DCCH Measurement Report transmitted from the mobile station 10 and passed to the control unit 230.

  The control unit 230 includes a measurement instruction unit 231 and a wireless parameter setting unit 232.

  When the measurement instructing unit 231 receives the registered femto base station information from the uplink control signal reproducing unit 220, the measurement instructing unit 231 confirms whether the own base station is a femto base station that controls the communication area. If it confirms that it is a femto base station controlled by its own base station, it instructs the mobile station that transmitted the registered femto base station information to measure the reception level of the reference signal from the femto base station. . In addition, when a predetermined condition is satisfied, the mobile station is instructed to stop the measurement.

Radio parameter setting section 232 determines whether it is better to expand the communication area of the femto base station based on the measurement value taken out by uplink control signal reproduction section 220. If it is determined that the enlargement is better, a parameter change amount corresponding to the measured value is calculated, and a radio parameter change request for the femto base station 30 is created.
Whether or not it is better to expand the communication area of the femto base station is determined by comparing the measured value with a predetermined threshold value. That is, when the measured value is equal to or lower than the first threshold and equal to or higher than the second threshold (first threshold> second threshold), it is determined that the communication area of the femto base station should be expanded. Specific examples of the threshold include a first threshold of −100 dBm, a second threshold of −140 dB for received signal strength, and a −10 dB and −20 dB for received signal quality, respectively.
Further, examples of radio parameters to be changed based on the measured reception level include transmission power and antenna tilt angle. The communication area can be expanded by increasing the transmission power (for example, 1 dB) or reducing the tilt angle with respect to the horizontal direction (for example, 10 degrees).

  When receiving the measurement instruction from the measurement instruction unit 231, the downlink control signal generation unit 240 generates a measurement request signal (Measurement Control) on the DCCH. Similarly, when a measurement stop instruction is received, a measurement stop signal is generated.

  The wired communication control unit 250 transmits the wireless parameter change request created by the wireless parameter setting unit 232 to the femto base station 30.

  FIG. 4 is a block diagram of the femto base station 30. The femto base station 30 includes a wireless transmission / reception unit 310, an uplink control signal reproduction unit 320, a control unit 330, a downlink control signal generation unit 340, and a wired communication control unit 350.

  The control unit 330 includes a wireless parameter changing unit 331. The radio parameter change unit 331 expands the communication area by adjusting the transmission power in accordance with a radio parameter change request from the macro base station. As a method for adjusting the transmission power, the transmission power of the control channel and the data channel is adjusted in proportion to the transmission power of the reference signal. In the case of a femto base station provided with a tilt angle control function, the communication area is expanded by adjusting the tilt angle of the antenna.

  Subsequently, the operation of the present embodiment will be described. FIG. 5 is a flowchart for explaining the operation of the first embodiment. In the following description, it is assumed that the macro base station 20 has already been determined to be a femto base station that controls the femto base station 30 to which the mobile station 10 is permitted to communicate.

  When the measurement instruction unit 231 issues a measurement instruction, the downlink control signal generation unit 240 sends a measurement request signal to the mobile station 10 via the wireless communication control unit 210 (step S1).

  When receiving the measurement request signal, the measurement unit 131 measures the reception level of the reference signal from the femto base station 30 (step S2).

  The uplink control signal generation unit 140 notifies the macro base station 20 of the reception level measured by the measurement unit 131 (step S3).

  When receiving the reception level from the mobile station 10, the wireless parameter setting unit 232 determines whether to expand the communication area (step S4). If it is determined that the communication area is not expanded (NO in step 4), the femto base station control process is terminated.

  On the other hand, if it is determined to expand the communication area (YES in step 4), a wireless parameter change request is generated to expand the communication area (step S5).

  The downlink control signal generation unit 240 notifies the femto base station 30 of the radio parameter change request created by the radio parameter setting unit 232 (step S6).

  The radio parameter changing unit 331 changes the radio parameter in accordance with the radio parameter change request transmitted from the macro base station 20 (step S7).

  According to the present embodiment, since the reception level from the femto base station is actually measured by the mobile station, it can be seen whether the communication area of the femto base station is reduced more than necessary. Therefore, by appropriately expanding the communication area of the femto base station, the mobile station can communicate with the femto base station, and sufficient communication quality can be obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the present embodiment, a configuration will be described in which determination is performed using position information of a mobile station in addition to a reception level. In addition, about the structure similar to the said 1st Embodiment, the same number is attached | subjected and detailed description is abbreviate | omitted. Further, in the following description, a configuration that is determined based on the location information of the mobile station will be described, but a configuration that is determined based on the communication status and location information may be used.

  When the measurement instructing unit 231 receives the registered femto base station information from the uplink control signal reproducing unit 220, the measurement instructing unit 231 confirms whether the own base station is a femto base station that controls the communication area. If it is confirmed that the base station is a femto base station that controls the base station, a measurement request signal is transmitted to the mobile station that transmitted the registered femto base station information.

When receiving the measurement request signal, the measurement unit 131 measures the position of the mobile station on the earth by GPS (Global Positioning System). Further, the reception level of the reference signal from the femto base station is measured.
The uplink control signal generation unit 140 transmits the positioning result and the measurement result to the macro base station 20.

  The radio parameter setting unit 232 holds position information indicating the position of the femto base station on the earth. When the positioning result and the measurement result are received from the mobile station 10, the received positioning result is compared with the position information of the femto base station to determine whether the mobile station 10 should be connected to the femto base station 30. For example, the distance between the femto base station and the mobile station is calculated from the received positioning result and the position information of the femto base station, and when the distance is a predetermined value (for example, 10 m) or less, the mobile station It is determined that it is better to connect to the station. If it is determined that the connection is better, the parameter to be expanded is determined based on the measurement result, and a radio parameter change request for the femto base station 30 is created.

  Subsequently, the operation of the present embodiment will be described. FIG. 6 is a flowchart for explaining the operation of the second embodiment. In the following description, it is assumed that the macro base station 20 has already been determined to be a femto base station that controls the femto base station 30 to which the mobile station 10 is permitted to communicate.

  When the measurement instruction unit 231 issues a measurement instruction, the downlink control signal generation unit 240 sends a measurement request signal to the mobile station 10 via the wireless communication control unit 210 (step S601).

  Upon receiving the measurement request signal, the measurement unit 131 measures the position information indicating the current position of the mobile station using GPS (step S602).

  Further, the measurement unit 131 measures the reception level of the reference signal from the femto base station 30 (step S603).

  The uplink control signal generation unit 140 notifies the macro base station 20 of the position information and the reception level measured by the measurement unit 131 (step S604).

  When receiving the position information from the mobile station 10, the wireless parameter setting unit 232 determines whether to expand the communication area (step S605). If it is determined not to expand the communication area (NO in step 605), the control process for the femto base station is terminated.

  On the other hand, when it is determined to expand the communication area (YES in step 605), a wireless parameter change request is generated to expand the communication area (step S606).

  The downlink control signal generation unit 240 notifies the femto base station 30 of the radio parameter change request generated by the radio parameter setting unit 232 (step S607).

  The radio parameter changing unit 331 changes the radio parameter according to the radio parameter change request transmitted from the macro base station 20 (step S608).

  In the above-described embodiment, the configuration in which the reception level is measured in response to the measurement instruction from the macro base station has been described. However, the configuration is not limited to this configuration. For example, the measurement unit 131 may periodically determine the position and determine whether to measure the reception level based on the positioning result. Further, as described above, after receiving a measurement request from the macro base station 20, it may be determined periodically to determine whether to measure the reception level based on the positioning result.

  In this Embodiment, it is determined whether the communication area of a femto base station is expanded based on the positional information on a mobile station. For this reason, the mobile station can communicate with the femto base station, and sufficient communication quality can be obtained.

  In the present embodiment, description is made using GPS as a means for acquiring position information. However, the present invention is not limited to this, and other means such as using radio waves communicating with a macro base station or a mobile station are used. It may be by means.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the above embodiment, the configuration for expanding the communication area of the femto base station has been described. In the present embodiment, a configuration for reducing the expanded communication area or maintaining the current size will be described. In addition, about the structure similar to the said embodiment, the same number is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 7 is a block diagram illustrating a configuration of the femto base station 30 according to the present embodiment. The femto base station 30 further includes a measurement instruction unit 332 and a radio parameter setting unit 333.

  The measurement instruction unit 332 transmits a measurement request signal to the mobile station 10 connected to the own station via DCCH. The transmission request signal may be transmitted periodically or when an arbitrary condition is satisfied.

  The radio parameter setting unit 333 determines whether it is better to reduce the communication area after expanding the communication area of the femto base station based on the reception level transmitted from the mobile station 10. If it is determined that the reduction is better, the parameter change amount corresponding to the measured value is calculated, a radio parameter change request is created, and the radio parameter change unit 331 is notified. Whether to reduce the communication area of the femto base station is determined based on whether the measured value is equal to or greater than a threshold value. That is, when the measured value is greater than or equal to the third threshold value, it is determined that the communication area of the femto base station should be reduced. As a specific example of the threshold value, −50 dBm ≧ threshold is set for the strength of the received signal, and −3 dB ≧ threshold is set for the quality of the received signal.

  Subsequently, the operation of the present embodiment will be described. FIG. 8 is a flowchart for explaining the operation of the third embodiment.

  The measurement instruction unit 332 transmits a measurement request signal to the mobile station 10 (step S801).

  When receiving the measurement request signal, the measurement unit 131 measures the reception level of the reference signal from the femto base station 30 (step S802).

  The uplink control signal generation unit 140 notifies the femto base station 30 of the reception level measured by the measurement unit 131 (step S803).

  After receiving the reception level from the mobile station 10 after expanding the communication area, the wireless parameter setting unit 333 determines whether to reduce the communication area (step S804). If it is determined that the communication area is not reduced (NO in step S804), the femto base station control process ends.

  If it is determined that the communication area is to be reduced, a parameter change amount corresponding to the measured value is calculated to reduce the communication area, and a wireless parameter change request is generated (step S805). Then, the generated wireless parameter change request is notified to the wireless parameter changing unit 331 (step S806).

  The radio parameter changing unit 331 changes the radio parameter in accordance with the radio parameter change request generated by the radio parameter setting unit 333 (step S807).

  Although the above embodiment has been described using the configuration for determining whether to reduce the communication area based on the reception level, another configuration may be used. For example, the femto base station may hold the position information of the own station and determine whether to reduce the communication area based on the position information measured by the measurement unit 131 of the mobile station. In this case, for example, the distance between the local station and the mobile station is calculated from the position information of the local station and the received positioning result, and if the distance exceeds a predetermined value (for example, 15 m to 20 m), the distance is reduced. judge.

  According to the present embodiment, it is possible to prevent the femto base station from affecting the communication quality of the macro base station by expanding the communication area.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the above-described embodiment, the configuration in which the radio parameter setting unit 232 determines whether it is better to expand the communication area of the femto base station has been described. In this embodiment, a configuration that is determined by the measurement unit 131 of the mobile station will be described. In addition, about the structure similar to the said embodiment, the same number is attached | subjected and detailed description is abbreviate | omitted.

  The measurement unit 131 determines whether it is better to expand the communication area of the femto base station based on the measurement value. When it is determined that the enlargement is better, the macro base station is notified of the fact and the measurement value.

  When receiving the determination result that it is better to expand the communication area of the femto base station, the wireless parameter setting unit 232 calculates a wireless parameter change amount according to the measurement value, and creates a wireless parameter change request.

  Subsequently, the operation of the present embodiment will be described. FIG. 9 is a flowchart for explaining the operation of the fourth embodiment.

  When the measurement instruction unit 231 issues a measurement instruction, the downlink control signal generation unit 240 sends a measurement request signal to the mobile station 10 via the wireless communication control unit 210 (step S901).

  When receiving the measurement request signal, the measurement unit 131 measures the reception level of the reference signal from the femto base station 30 (step S902).

  The uplink control signal generation unit 140 determines whether to expand the communication area based on the reception level measured by the measurement unit 131 (step S903). If it is determined not to expand the communication area (NO in step S903), the femto base station control process ends.

  On the other hand, if it is determined that the communication area is to be expanded (YES in step S903), the macro base station 20 is notified of this and the reception level (step S904).

  When receiving the reception level and the determination result from the mobile station 10, the wireless parameter setting unit 232 calculates a parameter change amount and generates a wireless parameter change request to expand the communication area (step S905).

  The downlink control signal generation unit 240 notifies the femto base station 30 of the radio parameter change request created by the radio parameter setting unit 232 (step S906).

  The radio parameter changing unit 331 changes the radio parameter according to the radio parameter change request transmitted from the macro base station 20 (step S907).

  According to the present embodiment, since the reception level from the femto base station is actually measured by the mobile station, it can be seen whether the communication area of the femto base station is reduced more than necessary. Therefore, by appropriately expanding the communication area of the femto base station, the mobile station can communicate with the femto base station, and sufficient communication quality can be obtained. As in this embodiment, the determination of the expansion of the communication area of the femto base station can be distributed to any device such as a macro base station or a mobile station.

  In the first to fourth embodiments, the configuration in which the macro base station creates the radio parameter change request has been described. However, as shown in FIG. 10, the femto connected to the macro base station via the network is described. The base station management server may receive various information from the macro base station and perform control.

  In addition, the mobile station, macro base station, and femto base station of the present invention described above can be configured by hardware as is apparent from the above description, but can also be realized by a computer program. . In this case, functions and operations similar to those of the above-described embodiment are realized by a processor that operates according to a program stored in the program memory. Note that only a part of the functions of the above-described embodiment can be realized by a computer program.

  Although the wireless parameter change request from the macro base station 20 to the femto base station 30 has been described as being performed by the wired communication control unit via a dedicated or wired connection via a network, it may be performed via wireless data communication. good. In that case, instead of the wired communication control unit, the femto base station may have a configuration capable of receiving a change request from the macro base station via wireless. The wireless communication system to which the present embodiment is applied is not particularly limited. For example, LTE (Long Term Evolution), W-CDMA (Wideband Code Division Multiple Access), WLAN (Wireless Local Area Network), IEEE (Institute of Electrical). and Electronics Engineers) Various wireless communication methods including the specifications defined in 802.16m are applicable.

  Although the present invention has been described with reference to the embodiments and examples, the present invention is not necessarily limited to the above-described embodiments and examples, and various modifications can be made within the scope of the technical idea. I can do it.

DESCRIPTION OF SYMBOLS 10 Mobile station 20 Macro base station 30 Femto base station 110 Radio | wireless communication control part 120 Downlink control signal reproduction | regeneration part 130 Control part 140 Uplink control signal generation part 210 Wireless communication control part 220 Uplink control signal reproduction | regeneration part 230 Control part 240 Downlink control signal generation | occurrence | production Unit 250 wired communication control unit 310 wireless transmission / reception unit 320 uplink control signal reproduction unit 330 control unit 340 downlink control signal generation unit 350 wired communication control unit

Claims (10)

  1. A wireless communication system comprising a first base station, a second base station, and a mobile station that can be connected to both the first and second base stations,
    The mobile station has means for measuring a reception level of a signal transmitted from the first base station, means for positioning position information of the mobile station, and the reception level and the position information. Means for transmitting to the base station,
    The second base station determines whether the mobile station is within a predetermined distance from the first base station. If the mobile station is within the predetermined distance, the second base station determines the first base station according to the reception level. A control means for creating a request for changing a radio parameter and transmitting it to the first base station;
    The wireless communication system, wherein the first base station has control means for changing a wireless parameter in accordance with the wireless parameter change request received from the second base station.
  2. A base station,
    Based on the position information of the mobile station measured by the mobile station, it is determined whether the mobile station is within a predetermined distance from a first base station that is a base station other than its own base station, and is within the predetermined distance The mobile station creates a radio parameter change request for the first base station according to a reception level obtained by measuring a signal transmitted from the first base station, and the first base station A base station comprising control means for transmitting to the base station.
  3.   The base station according to claim 2, wherein the control means expands a communication area of the first base station when the measurement result is equal to or less than a first threshold and equal to or greater than a second threshold. .
  4.   The base station according to claim 2 or 3, wherein the reception level is a strength of reception of a signal from the first base station.
  5.   The base station according to claim 2, wherein the reception level is a communication quality of a signal from the first base station.
  6.   The base station according to claim 2, further comprising a reduction control unit that reduces a communication area when a result of the measurement is equal to or greater than a third threshold value.
  7.   The said control means expands the communication area of the said 1st base station by controlling the transmission power of the said 1st base station, The Claim 1 characterized by the above-mentioned. base station.
  8.   The said control means expands the communication area of the said 1st base station by controlling the tilt angle of the said 1st base station, The Claim 1 characterized by the above-mentioned. base station.
  9. A control device,
    Based on the position information of the mobile station measured by the mobile station, it is determined whether the mobile station is within a predetermined distance from a first base station that is a base station other than the connected base station, and within the predetermined distance The mobile station has control means for expanding the communication area of the first base station according to the reception level obtained by measuring the signal transmitted from the first base station. Control device.
  10. A radio parameter change request generation method in a base station,
    Based on the location information of the mobile station measured by the mobile station, it is determined whether the mobile station is within a predetermined distance from a first base station other than its own station. A creation step of creating a request for changing a radio parameter of the first base station according to a reception level obtained by measuring a signal transmitted from the first base station by the station;
    A radio parameter change request generation method comprising: a transmission step of transmitting the created radio parameter change request to the first base station.
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