JP5858840B2 - Wireless communication system, wireless communication base station, management apparatus, wireless communication terminal, and wireless communication method - Google Patents

Description

  The present invention relates to a radio communication system, a radio communication base station, a management device, a radio, and a radio communication base station in consideration of interference in a communication area of a radio communication base station and an increase in power consumption when radio devices in a plurality of frequency bands are operated simultaneously. The present invention relates to a communication terminal and a wireless communication method.

  In IMT-Advanced, it is considered to operate in a plurality of frequency bands in a wireless communication system. Therefore, the radio communication base station operates a plurality of radio devices simultaneously in order to operate at a plurality of frequencies. Thus, the prior art which forms a different communication area with a different frequency is known (for example, refer patent documents 1 and 2).

Japanese Patent Laid-Open No. 04-336822 Special table 2011-505088 gazette

However, the prior art has the following problems.
As a feature of the radio communication base station for cellular communication, the radio communication base station needs to be always connected because of the importance of ensuring the coverage, and there is a concern about an increase in power consumption.

  On the other hand, in IMT-Advanced, the use of femto base stations that form an area locally is being studied. When the user can install the femto base station at an arbitrary location, there is a concern about interference from the femto base station depending on the location.

  Therefore, as a conventional technique, a femto base station that searches for neighboring base stations before starting operation and operates with appropriate transmission power is known. In this case, when an event for operating the femto base station occurs, it takes time to search for a neighboring base station, and thus there is a problem that immediate operation cannot be performed.

  The present invention has been made in order to solve the above-described problems, and has the problem of interference in the communication area of the radio communication base station and the increase in power consumption when operating radios in a plurality of frequency bands at the same time. An object of the present invention is to obtain a wireless communication system, a wireless communication base station, a management device, a wireless communication terminal, and a wireless communication method that can solve the problem.

  The wireless communication system according to the present invention can use only the first frequency, or can use the first frequency and the second frequency, a plurality of wireless communication terminals, and the first frequency and the second frequency. A wireless communication system comprising a plurality of wireless communication base stations that perform wireless communication with a plurality of wireless communication terminals, and a management device connected to the plurality of wireless communication base stations via a wired network, Each of the plurality of radio communication terminals can use only the first frequency or the first frequency and the second frequency with respect to the plurality of radio communication base stations at the start of communication. When terminal radio information indicating whether it is usable is transmitted and received reception power measurement notifications from a plurality of radio communication base stations during communication, the received power of the radio communication base station with which it is communicating Measure The measurement results are returned as wireless quality information, and each of the plurality of wireless communication base stations has a list of wireless communication base stations existing in the vicinity based on the received power measured from the peripheral base stations at the start of operation. After the base station list information is transmitted to the management apparatus and the operation is started using the first frequency, when the traffic on the first frequency becomes equal to or higher than a predetermined specified value, a plurality of wireless communication A reception power measurement notification is periodically transmitted to the terminal, and the traffic reduction request information created based on the wireless quality information acquired as a response to the reception power measurement notification is transmitted to the management device. When the neighboring base station list information is received from any of the plurality of wireless communication base stations, the stored neighboring base station list is updated, and the updated neighboring base station list is already operated. When transmitted to another started wireless communication base station and received traffic reduction request information from any of the plurality of wireless communication base stations, a plurality of wireless communication base stations are configured based on the traffic reduction request information and the neighboring base station list information. Control data for starting wireless communication using the second frequency is transmitted to any of the wireless communication base stations.

  The radio communication base station according to the present invention includes a first radio that performs radio communication with a plurality of radio communication terminals at a first frequency, and a first radio that performs radio communication with a plurality of radio communication terminals at a second frequency. 2 and the neighboring base station list information that lists the neighboring base stations communicating at the first frequency and the second frequency based on the received power measured from the neighboring base stations at the start of operation. A peripheral base station detection unit that generates the control unit, a control unit that controls the power and transmission power of the second radio based on the control data received from the management device, and a terminal that is received from each of the plurality of radio communication terminals A terminal information holding unit that holds wireless device information and wireless quality information for each terminal, and monitors wireless communication traffic. When traffic at the first frequency exceeds a predetermined value, a plurality of wireless information Communication terminal A wireless interface connected to a wired network, and a traffic monitoring unit that periodically acquires a reception power measurement notification to acquire wireless quality information and generates traffic reduction request information based on the acquired wireless quality information And a notification data creation unit for notifying the management apparatus of peripheral base station list information, traffic reduction request information, and terminal wireless device information via a wired interface unit as necessary.

  Also, the management device according to the present invention includes a wired interface unit connected to a wired network, and notification data of peripheral base station list information and traffic reduction request information received from a plurality of wireless communication base stations via the wired interface unit. By identifying the notification data storage unit to be stored and analyzing the notification data, the wireless communication base station that starts the wireless communication using the second frequency is identified and identified from among the plurality of wireless communication base stations Control data for notifying the start of radio communication using the second frequency and the transmission power based on the analysis result by the notification data analysis unit for determining the transmission power of the radio communication base station and the notification data analysis unit The created control data is transmitted to the wireless communication base station created and specified by the notification data analysis unit via the wired interface unit. In which a control data generating unit for transmitting data.

  In addition, the wireless communication terminal according to the present invention is a wireless terminal device that can use only the first frequency, and a first wireless device that performs wireless communication with a plurality of wireless communication base stations at the first frequency; At the start of communication, terminal wireless device information indicating that the mobile station itself can use only the first frequency is transmitted to a plurality of wireless communication base stations. A radio frequency information communication unit that, when receiving a reception power measurement notification, measures reception power of a radio communication base station with which it is communicating and returns a measurement result as radio quality information; In the wireless terminal device that can use the second frequency, the first wireless device that performs wireless communication with the plurality of wireless communication base stations at the first frequency, the plurality of wireless communication base stations, and the second Communicating with a second radio that performs radio communication at a frequency At the beginning, terminal wireless device information indicating that it can use the first frequency and the second frequency is transmitted to a plurality of wireless communication base stations, and a plurality of wireless communication bases are in communication. When receiving a reception power measurement notification from a station, it comprises a radio information communication unit that measures the reception power of the radio communication base station with which it is communicating and returns the measurement result as radio quality information .

  Furthermore, the wireless communication method according to the present invention includes a plurality of wireless communication terminals that can use only the first frequency, or can use the first frequency and the second frequency, and the first frequency and the second frequency. Can be used, and is applied to a wireless communication system including a plurality of wireless communication base stations that perform wireless communication with a plurality of wireless communication terminals, and a management device connected to the plurality of wireless communication base stations via a wired network In each of the plurality of wireless communication terminals, at the start of communication, each of the plurality of wireless communication terminals can use only the first frequency with respect to the plurality of wireless communication base stations. Transmitting terminal radio information indicating whether the first frequency and the second frequency can be used, and receiving reception power measurement notifications from a plurality of radio communication base stations during communication. Measuring the received power of the wireless communication base station with which the communication is performed, and returning the measurement result as wireless quality information. In each of the plurality of wireless communication base stations, Based on the measured received power, after transmitting the neighboring base station list information listing the wireless communication base stations existing in the vicinity to the management device, and using the first frequency, Created based on wireless quality information acquired by periodically transmitting received power measurement notifications to multiple wireless communication terminals when traffic at one frequency exceeds a specified value Transmitting the traffic reduction request information to the management device, wherein the management device receives the neighboring base station list information from any of the plurality of radio communication base stations. In this case, the stored neighboring base station list is updated, and the updated neighboring base station list is transmitted to another wireless communication base station that has already started operation, and one of a plurality of wireless communication base stations When the traffic reduction request information is received from the wireless communication base station, wireless communication using the second frequency is started for any one of the plurality of wireless communication base stations based on the traffic reduction request information and the neighboring base station list information. Transmitting control data for performing the operation.

  According to the present invention, when traffic in the first frequency band of the radio communication base station increases, traffic is started by starting radio communication in the stopped second frequency band according to the interference state. The problem of interference in the communication area of the radio communication base station and the increase in power consumption when operating radios in multiple frequency bands simultaneously by selecting radio communication base stations that can achieve reduction and starting operation Wireless communication system, wireless communication base station, management apparatus, wireless communication terminal, and wireless communication method can be obtained.

1 is an overall configuration diagram of a radio communication system according to a first embodiment of the present invention. It is a block diagram of the radio | wireless communication base station in Embodiment 1 of this invention. It is a block diagram of the radio | wireless communication terminal in Embodiment 1 of this invention. It is a block diagram of the management apparatus in Embodiment 1 of this invention. It is explanatory drawing regarding the communication control operation | movement of the 1st case in Embodiment 1 of this invention. It is explanatory drawing regarding the communication control operation | movement of the 2nd case in Embodiment 1 of this invention. It is explanatory drawing regarding the communication control operation | movement of the 3rd case in Embodiment 1 of this invention. It is explanatory drawing regarding the communication control operation | movement of the 4th case in Embodiment 1 of this invention. It is explanatory drawing regarding the communication control operation | movement of the 5th case in Embodiment 1 of this invention.

  Hereinafter, preferred embodiments of a wireless communication system, a wireless communication base station, a management device, a wireless communication terminal, and a wireless communication method of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is an overall configuration diagram of a radio communication system according to Embodiment 1 of the present invention. The wireless communication system according to the first embodiment includes a plurality of wireless communication base stations 11 and 12, a plurality of wireless communication terminals 21, 22, 23 and 24, and information collection of the plurality of wireless communication base stations 11 and 12 and And a management device 31 that performs control.

  FIG. 2 is a configuration diagram of the radio communication base station according to Embodiment 1 of the present invention. The wireless communication base station 11 includes a wireless device 101 that wirelessly communicates at a first frequency, a wireless device 102 that wirelessly communicates at a second frequency, and a peripheral base station detection unit that searches for wireless wireless devices 101 and peripheral base stations by the wireless device 102 103, the power control unit 104 that controls the power supply of the wireless device 101 and the wireless device 102 according to the command from the management device 31, the transmission power control unit 105 that controls the transmission power according to the command from the management device 31, and the wireless communication terminal Information (corresponding to terminal radio information and radio quality information, details will be described later) for each terminal, a terminal information holding unit 106, a traffic monitoring unit 107 for monitoring traffic, and information to be notified to the management device 31 (neighboring bases) Notification data creation unit 108 that creates station list information (details will be described later) and a wired interface connected to a wired network. It includes a scan unit 109.

  In the first embodiment, radio communication base station 12 has the same configuration as radio communication base station 11.

  FIG. 3 is a configuration diagram of radio communication terminals 21 to 24 according to Embodiment 1 of the present invention. Here, FIG. 3A illustrates the configuration of the wireless communication terminals 21, 23, and 24, and FIG. 3B illustrates the configuration of the wireless communication terminal 22 as an example.

  The wireless communication terminal 21 (23, 24) shown in FIG. 3A includes a wireless device 201 that wirelessly communicates at a first frequency, a wireless device 202 that wirelessly communicates at a second frequency, and a wireless communication base station 11, 12 includes a wireless device information notifying unit 203 that notifies the type of wireless device owned by itself as terminal wireless device information when communication with the wireless communication device 12 starts.

  Also, the wireless communication terminal 22 shown in FIG. 3B has the wireless device 201 that wirelessly communicates at the first frequency, and the wireless device type that the wireless communication terminal 22 has at the start of communication with the wireless communication base station. As a wireless device information notification unit 203.

  In the description of the first embodiment, the wireless communication terminals 23 and 24 have the same configuration as the wireless communication terminal 21. That is, the three wireless communication terminals 21, 23, and 24 have both a wireless device 101 that wirelessly communicates at the first frequency and a wireless device 102 that wirelessly communicates at the second frequency. . On the other hand, it is assumed that the wireless communication terminal 22 has only the wireless device 101 that performs wireless communication at the first frequency.

  FIG. 4 is a configuration diagram of the management apparatus 31 according to the first embodiment of the present invention. The management device 31 stores notification data (corresponding to peripheral base station list information or terminal radio information, details will be described later) to be acquired from the radio communication base station 11 and the radio communication base station 12. A notification data analysis unit 302 that analyzes the notification data, a control data generation unit 303 that generates control data for performing transmission power control and power supply control of the radio communication base station 11 and the radio communication base station 12 from the analysis result, and A wired interface unit 304 for connecting to a wired network is provided.

  Next, a specific communication control operation according to the first embodiment will be described using an operation flow separately in five cases. In the following description, it is assumed that the configuration shown in FIG. 1, that is, the configuration of the two wireless communication base stations 11 and 12, the four wireless communication terminals 21 to 24, and the one management device 31 is used. Proceed with the story. However, the numbers of the plurality of wireless communication base stations and the plurality of wireless communication terminals are not limited to this.

  Further, if necessary, the internal components of the first radio communication base station 11 are denoted by reference numerals 101 (1) to 109 (1), and the internal components of the second radio communication base station 12. Are represented by reference numerals 101 (2) to 109 (2). Similarly, the internal components of the first wireless communication terminal 21 to the fourth wireless communication terminal 24 are distinguished by the subscripts (1) to (4) as necessary. .

  First, as a first case, an operation when the radio communication base station 11 starts operation at a position where the radio communication base station 12 can receive radio waves will be described. FIG. 5 is an explanatory diagram relating to the communication control operation of the first case according to the first embodiment of the present invention.

  First, in step S501, the neighboring base station detection unit 103 (1) in the radio communication base station 11 receives a signal from the neighboring base station (corresponding to the radio communication base station 12) when the power is turned on. The power is measured and it is determined that the wireless communication base station 12 exists. Next, in step S502, the neighboring base station detection unit 103 (1) transmits the detected neighboring base station information to the notification data creation unit 108 (1), and the notification data creation unit 108 (1) Stations are listed and neighboring base station list information is created.

  Next, in step S503, the notification data creation unit 108 (1) transmits the neighboring base station list information to the management apparatus 31 via the wired interface unit 109 (1).

  On the other hand, in step S <b> 504, the management apparatus 31 receives the neighboring base station list information from the radio communication base station 11 as notification data and stores it in the notification data storage unit 301. Further, the notification data analysis unit 302 detects that the other wireless communication base station 12 that has already received the neighboring base station list information is included in the notification data, and the neighboring base station of the wireless communication base station 12 The neighboring base station list information is updated by adding the radio communication base station 11 to the station list information.

  Next, in step S505, the management apparatus 31 transmits the updated neighboring base station list information to another wireless communication base station (corresponding to the wireless communication base station 12). On the other hand, in step S506, the wireless communication base station 11 starts operation with the wireless device 101 (1) turned on and the wireless device 102 (2) turned off.

  As described above, when the series of operations according to the first case is completed, the radio communication base station 11 starts operating in the first frequency band, and the management apparatus 31 While updating the neighboring base station list information based on the neighboring base station list information acquired from the communication base station 11, the updated neighboring base station list information can be transmitted to the other radio communication base stations 12.

  Next, as a second case, an operation at the start of communication between the radio communication base station 11 and the radio communication terminal 21 will be described. FIG. 6 is an explanatory diagram relating to the communication control operation of the second case according to the first embodiment of the present invention.

  First, in step S601, the wireless communication terminal 21 transmits terminal wireless device information indicating that the wireless communication terminal 21 has the wireless device 201 and the wireless device 202 in the communication start sequence. Created by the information notification unit 203 (1).

  Next, in step S602, the wireless communication terminal 21 notifies the wireless communication base station 11 of the terminal wireless device information via the wireless device 201 (1). Next, in step S603, the radio communication base station 11 stores the notified terminal radio information in the terminal information holding unit 106 (1).

  Although details are omitted, it is assumed that the wireless communication terminal 22 starts communication with the wireless communication base station 11 in the same procedure. The wireless communication terminals 23 and 24 are assumed to start communication with the wireless communication base station 12 in the same procedure.

  As described above, when the series of operations in the second case is completed, each of the wireless communication base stations 11 and 12 can acquire the terminal wireless device information of the wireless communication terminal that has started communication.

  Next, as a third case, an operation during communication between the radio communication base station 11 and the radio communication terminal 21 will be described. FIG. 7 is an explanatory diagram relating to the communication control operation of the third case in the first embodiment of the present invention.

  First, in step S701, the wireless communication base station 11 receives data from wireless communication base stations (corresponding to the wireless communication base stations 11 and 12) included in the neighboring base station list information during communication with the wireless communication terminal 21. A reception power measurement notification is transmitted to the wireless communication terminal 21 so as to measure the power.

  Next, in step S702, upon receiving the reception power measurement notification, the radio communication terminal 21 periodically measures the reception power of the radio communication base station with which it is communicating. Further, in step S703, the radio communication terminal 21 reports the measurement result to the radio communication base station 11 as radio quality information.

  Next, in step S704, the radio communication base station 11 stores the radio quality information received from the radio communication terminal 21 as information indicating the interference status of the radio communication base stations 11 and 12 in the radio communication terminal 21. Held in the unit 106 (1).

  As described above, when the series of operations in the third case is completed, each wireless communication base station 11 or 12 can interfere with each wireless communication base station in the wireless communication terminal from the wireless communication terminal in communication. Radio quality information indicating the situation can be acquired.

  Next, as a fourth case, an operation when the traffic monitoring unit 107 (1) of the radio communication base station 11 detects that the traffic amount has exceeded a predetermined specified value will be described. FIG. 8 is an explanatory diagram relating to the communication control operation of the fourth case in the first embodiment of the present invention.

  In FIG. 8, in the wireless communication base station 11, when the communication interference in the wireless device 101 (1) is larger than a predetermined threshold, the management device 31 performs wireless communication of another wireless communication base station 12 with the wireless device. An operation of reducing interference by switching from 101 (2) to the wireless device 102 (2) will be described.

  That is, the radio communication base station 11 determines the second frequency based on the terminal radio information and radio quality information acquired from each radio communication terminal performing radio communication, and the neighboring base station list information created by itself. When it is determined that the interference of communication in the wireless device 201 using the first frequency from the peripheral base station of the wireless communication terminal having the wireless device 202 that performs wireless communication in FIG. Done.

  First, in step S801, the radio communication base station 11 makes the terminal information holding unit 106 (1) to the management device 31 when the communication interference in the radio 101 (1) is larger than a predetermined threshold. Notify the terminal radio information that is held, and inquire about activation of the radio 102 (1) by the second frequency (whether the radio 102 (1) by the second frequency should be activated in the radio communication base station 11 The other radio communication base station 12 makes an inquiry about whether to activate the radio device 102 (2) using the second frequency.

  Next, in step S <b> 802, when the management device 31 receives the activation inquiry, the management device 31 determines the wireless communication base based on the notified terminal wireless device information and the neighboring base station list information stored in the notification data storage unit 301. Among the wireless communication base stations described in the neighboring base station list information of the station 11, the wireless communication base station that most interferes with the wireless communication terminal communicating with the wireless communication base station 11 is identified (here, The discussion proceeds assuming that the wireless communication base station 12 has been identified).

  Next, in step S803, if the wireless device 102 (2) of the specified wireless communication base station 12 is not activated, the management device 31 stores the terminal information holding unit 106 (2) of the wireless communication base station 12 in the step S803. Queries the held terminal radio information.

  Although not shown in FIG. 8, when the corresponding base station (wireless communication base station 12) has already started the wireless device 102, the management device 31 next causes interference to the wireless communication terminal. Inquire to the wireless communication base station. Furthermore, when all the peripheral base stations have started up the wireless device 102, the management apparatus 31 operates the wireless communication base station 11 with the transmission power of the wireless device 102 (1) lowered. And also notifies other wireless communication base stations included in the neighboring base station list information to operate with lower transmission power.

  Returning to the description of FIG. 8, in step S <b> 804, the management apparatus 31 acquires terminal radio information from the radio communication base station 12 as a result of the inquiry. Next, in step S805, the management apparatus 31 selects a radio communication base station having the largest number of terminals having the radio 202 for radio communication at the second frequency based on the acquired terminal radio information.

  Here, the radio communication base station 12 has a larger number of terminals having the radio 202 for radio communication at the second frequency than the radio communication base station 11, and the radio communication base station 12 is selected in step S805. Let's talk as if.

  In step S806, the management device 31 notifies the selected wireless communication base station 12 to operate with the transmission power of the wireless device 102 (2) maximized. At the same time, in step S807, the wireless communication base station 11 is notified not to activate the wireless device 102 (1).

  Next, in step S808, the wireless communication base station 12 is notified of the transmission power in the previous step S806, and then the power source control unit 104 (2) turns on the power of the wireless device 102 (2) to transmit the transmission power. The transmission power is controlled by the control unit 105 (2), and the operation of the wireless device 102 (2) is started.

  Further, in step S809, the wireless communication base station 12 starts the operation of the wireless device 102 (2), and then transfers the wireless communication terminal communicating with the wireless device 101 (1) to the wireless device 102 (2). By performing the handover, the wireless traffic of the wireless device 101 (1) is reduced, and interference with the wireless communication terminal communicating with the wireless communication base station 11 is reduced.

  Although not shown in FIG. 8, the radio communication base station 12 is configured such that when the traffic volume of the radio communication base station 11 decreases or when there is no radio communication terminal communicating with itself, the radio 102 Stop the operation of (2).

  Further, although not shown in FIG. 8, in the determination of the previous step S805, the wireless communication base station 11 has a wireless device 202 for wireless communication at the second frequency rather than the wireless communication base station 12. When the number of terminals is large and the radio communication base station 11 is selected, the above-described processes of step S806, step S808, and step S809 are performed in the radio communication base station 11.

  As described above, when the traffic in the first frequency exceeds a specified value in a certain radio communication base station by completing the series of operations in the fourth case, the management device 31 has the most traffic. By switching and controlling the radio communication base station identified as having a reduction effect to radio communication using another frequency, it is possible to reduce radio communication traffic using the first frequency.

  Next, as a fifth case, the operation different from the fourth case when the traffic monitoring unit 107 (1) of the radio communication base station 11 detects that the traffic amount is equal to or greater than a specified value will be described. To do. FIG. 9 is an explanatory diagram relating to the communication control operation of the fifth case in the first embodiment of the present invention.

  In FIG. 9, in the wireless communication base station 11, when the interference of communication in the wireless device 101 (1) is small (when it is below a predetermined threshold), the management device 31 uses the second frequency in each wireless communication base station. The operation for reducing interference by controlling the transmission power of the radio 102 will be described.

  That is, the radio communication base station 11 determines the second frequency based on the terminal radio information and radio quality information acquired from each radio communication terminal performing radio communication, and the neighboring base station list information created by itself. When it is determined that the interference of communication in the wireless device 201 by the first frequency from the peripheral base station of the wireless communication terminal having the wireless device 202 that performs wireless communication in FIG. 9 is small (below a predetermined threshold), FIG. A series of processes is performed.

  First, in step S901, the wireless communication base station 11 notifies the management apparatus 31 of activation of the wireless device 102 (1) (the wireless communication base station 11 activates the wireless device 102 (1) with the second frequency. Notification to obtain permission). Next, in step S902, when the management device 31 receives the activation notification, the wireless communication base station (corresponding to the wireless communication base station 12) described in the neighboring base station list information of the wireless communication base station 11 It is confirmed whether the machine 102 is activated.

  If the management device 31 determines that there is no peripheral base station that activates the wireless device 102, the management device 31 transmits the wireless device 102 (1) to the wireless communication base station 11 in step S903. Notify to operate with maximum transmission power.

  On the other hand, if the management apparatus 31 determines that there is a neighboring base station that activates the wireless device 102, the management device 31 transmits the transmission power of the wireless device 102 (1) to the wireless communication base station 11 in step S904. Notify you to operate it down. Further, in step S905, the management apparatus 31 also operates by reducing the transmission power for other wireless communication base stations (corresponding to the wireless communication base station 12) included in the neighboring base station list information. Notify

  On the other hand, in step S906, after being notified of the transmission power in the previous step S903 or step S904, the radio communication base station 11 turns on the radio 102 (1) by the power control unit 104 (1), and The transmission power control unit 105 (1) controls the transmission power, and the operation of the wireless device 102 (1) is started.

  As described above, when the series of operations according to the fifth case is completed, the management device 31 performs wireless communication using the second frequency according to the use status of the wireless devices of the neighboring base stations. By controlling the transmission power of the communication base station, interference can be reduced as a whole system.

  As described above, according to the first embodiment, when the traffic in the first frequency band of the radio communication base station increases, the radio in the second frequency band stopped according to the interference situation. By starting communication, it is possible to select a wireless communication base station that can realize traffic reduction and start operation. As a result, the power consumption can be reduced by stopping the operation during normal operation. Furthermore, by controlling the transmission power according to the operation status of the radio device of the second frequency of the neighboring base station when necessary, it is possible to reduce interference when the operation of the radio device of the second frequency is started. .

  DESCRIPTION OF SYMBOLS 11, 12 Wireless communication base station, 21-24 Wireless communication terminal, 31 Management apparatus, 101, 102 Radio, 103 Peripheral base station detection part, 104 Power supply control part (control part), 105 Transmission power control part (control part) , 106 Terminal information holding unit, 107 Traffic monitoring unit, 108 Notification data creation unit, 109 Wired interface unit, 201, 202 Radio, 203 Radio information notification unit, 301 Notification data storage unit, 302 Notification data analysis unit, 303 Control Data creation unit, 304 Wired interface unit.

Claims (7)

A plurality of wireless communication terminals capable of using only the first frequency or using the first frequency and the second frequency;
A plurality of radio communication base stations that can use the first frequency and the second frequency and perform radio communication with the plurality of radio communication terminals;
A wireless communication system comprising a management device connected to the plurality of wireless communication base stations via a wired network,
Each of the plurality of wireless communication terminals is
Whether at the start of communication, the plurality of radio communication base stations can use only the first frequency or can use the first frequency and the second frequency. Terminal radio information indicating
During communication, when receiving reception power measurement notification from the plurality of radio communication base stations, measure the reception power of the radio communication base station with which it is communicating, and return the measurement results as radio quality information,
Each of the plurality of wireless communication base stations
At the start of operation, based on the received power measured from the neighboring base stations, the neighboring base station list information listing the wireless communication base stations existing in the vicinity is transmitted to the management device,
After the operation using the first frequency is started, if the traffic at the first frequency becomes equal to or higher than a predetermined specified value, the received power measurement is performed on the plurality of wireless communication terminals. A notification is periodically transmitted, and the traffic reduction request information created based on the wireless quality information acquired as a response to the received power measurement notification is transmitted to the management device,
The management device
When the neighboring base station list information is received from any of the plurality of wireless communication base stations, the stored neighboring base station list is updated, and the updated neighboring base station list is already in operation. To the wireless communication base station of
When the traffic reduction request information is received from any of the plurality of radio communication base stations, based on the traffic reduction request information and the neighboring base station list information, any of the plurality of radio communication base stations On the other hand, control data for starting wireless communication using the second frequency is transmitted. A radio communication base station applied to the radio communication system according to claim 1,
A first radio that performs radio communication with the plurality of radio communication terminals at the first frequency;
A second radio that performs radio communication with the plurality of radio communication terminals at the second frequency;
Peripheral base station list information that lists peripheral base stations communicating at the first frequency and the second frequency based on received power measured from the peripheral base station at the start of operation A base station detector;
Based on the control data received from the management device, a control unit that controls the power and transmission power of the second radio,
A terminal information holding unit for holding the terminal radio information and the radio quality information received from each of the plurality of radio communication terminals for each terminal;
Monitor wireless communication traffic, and periodically transmit the received power measurement notification to the plurality of wireless communication terminals when the traffic at the first frequency exceeds a predetermined specified value. A traffic monitoring unit that obtains the wireless quality information and generates the traffic reduction request information based on the obtained wireless quality information;
A wired interface connected to the wired network;
A notification data creating unit for notifying the management apparatus of the neighboring base station list information, the traffic reduction request information, and the terminal wireless device information via the wired interface unit as necessary. Communication base station. In the radio communication base station according to claim 2,
Said traffic monitoring unit and the terminal radio information and the radio quality information acquired from each radio communication terminal that performs wireless communication using the first frequency, and the peripheral base station list information they create On the basis of the,
When it is determined that the interference of communication in the first wireless device by the first frequency from the peripheral base station of the wireless communication terminal having a wireless device that performs wireless communication at the second frequency is greater than a predetermined threshold. Is information for notifying a wireless communication terminal capable of communicating at the second frequency, the terminal radio information acquired from each wireless communication terminal, and the second wireless communication is performed at the second frequency. Generating the traffic reduction request information so as to include inquiry information as to whether or not the radio may be activated,
When it is determined that the interference of communication in the first radio by the first frequency from the peripheral base station of the radio communication terminal having the radio that performs radio communication at the second frequency is equal to or less than the predetermined threshold. Includes generating the traffic reduction request information so as to include notification information for obtaining permission to activate the second radio that performs radio communication at the second frequency. . A management device applied to the wireless communication system according to claim 1,
A wired interface connected to the wired network;
A notification data storage unit for holding the neighboring base station list information and the traffic reduction request information received from the plurality of wireless communication base stations via the wired interface unit as notification data;
By analyzing the notification data, the wireless communication base station that starts wireless communication using the second frequency is identified from the plurality of wireless communication base stations, and the identified wireless communication base station A notification data analysis unit for determining transmission power;
Based on the analysis result by the notification data analysis unit, the control data for notifying the start of wireless communication using the second frequency and the transmission power is created, and the notification is made via the wired interface unit. A control device comprising: a control data creation unit that transmits the created control data to the radio communication base station identified by a data analysis unit. The management device according to claim 4,
The notification data analysis unit, as the received traffic reduction request information, is information for notifying a wireless communication terminal that can communicate at the second frequency, the terminal radio information acquired from each wireless communication terminal, Inquiry information on whether or not to activate the second radio that performs radio communication at the second frequency is included,
Based on the terminal radio information and the peripheral base station list information, a peripheral base station that performs wireless communication with each wireless communication terminal using only the first frequency without using the second frequency Among these, the radio communication base station that most interferes with the radio communication base station that is the transmission source of the traffic reduction request information is identified,
By inquiring about the number of terminals that can communicate at the second frequency to the specified radio communication base station, obtain terminal radio information corresponding to the specified radio communication base station,
Based on the terminal radio information acquired from each radio communication base station, the radio communication base station having the largest number of radio communication terminals that can communicate at the second frequency is assigned to the radio communication using the second frequency. A management apparatus characterized in that it is identified as a radio communication base station that starts the communication. A wireless communication terminal applied to the wireless communication system according to claim 1,
In a wireless terminal device that can use only the first frequency,
A first radio that performs radio communication with the plurality of radio communication base stations at the first frequency;
At the start of communication, terminal wireless device information indicating that the mobile station itself can use only the first frequency is transmitted to the plurality of wireless communication base stations. A radio information communication unit that, when receiving a reception power measurement notification from a station, measures the reception power of the radio communication base station with which it is communicating, and returns the measurement result as radio quality information,
In the wireless terminal device that can use the first frequency and the second frequency,
A first radio that performs radio communication with the plurality of radio communication base stations at the first frequency;
A second radio that performs radio communication with the plurality of radio communication base stations at the second frequency;
At the start of communication, the terminal wireless device information indicating that it can use the first frequency and the second frequency is transmitted to the plurality of wireless communication base stations. When receiving reception power measurement notifications from a plurality of radio communication base stations, a radio information communication unit that measures reception power of the radio communication base station with which it is communicating and returns measurement results as radio quality information; A wireless communication terminal comprising: A plurality of wireless communication terminals capable of using only the first frequency or using the first frequency and the second frequency;
A plurality of radio communication base stations that can use the first frequency and the second frequency and perform radio communication with the plurality of radio communication terminals;
A wireless communication method applied to a wireless communication system comprising the plurality of wireless communication base stations and a management device connected by a wired network,
In each of the plurality of wireless communication terminals,
Whether at the start of communication, the plurality of radio communication base stations can use only the first frequency or can use the first frequency and the second frequency. Transmitting terminal radio information indicating:
When receiving reception power measurement notifications from the plurality of radio communication base stations during communication, measuring the reception power of the radio communication base station with which it is communicating, and returning the measurement results as radio quality information Including and
In each of the plurality of wireless communication base stations,
At the start of operation, based on the received power measured from the neighboring base stations, transmitting the neighboring base station list information listing the wireless communication base stations existing in the vicinity to the management device;
After the operation using the first frequency is started, if the traffic at the first frequency becomes equal to or higher than a predetermined specified value, the received power measurement is performed on the plurality of wireless communication terminals. Transmitting the traffic reduction request information created based on the wireless quality information acquired by periodically sending a notification to the management device, and
In the management device,
When the neighboring base station list information is received from any of the plurality of wireless communication base stations, the stored neighboring base station list is updated, and the updated neighboring base station list is already in operation. Transmitting to a wireless communication base station of
When the traffic reduction request information is received from any of the plurality of radio communication base stations, based on the traffic reduction request information and the neighboring base station list information, any of the plurality of radio communication base stations On the other hand, a step of transmitting control data for starting wireless communication using the second frequency is included.

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