JP2006180254A - Radio base station system, operation switching method, and operation switching program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio base station system, an operation switching method, and an operation switching program that operation styles of the radio base stations can properly be switched on the basis of the communication quality and traffic amount of the whole radio base station system. <P>SOLUTION: The radio base station system enables joint operation carried out by a master base station and a slave base station communicating with a radio terminal station under the control of the master base station; and respective radio base stations each includes a communication state detection section 102 which detects a communication state and a center control section 5 which changes breakdowns of the number of control channels and the number of communication channels on the basis of operation information and at least one of the respective radio base stations further includes a gathering section 12 which gathers communication states of the respective radio base stations in the joint operation, an operation decision section 13 which determines breakdowns of the respective radio base stations on the basis of the respective communication states, and an operation information output section 7 which outputs operation information representing the determined breakdowns to the respective radio base stations. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio base station system, an operation switching method, and an operation switching program, and in particular, a master base station and a slave base station are connected and a slave base station communicates with a radio terminal station based on control of the master base station. The present invention relates to a radio base station system, an operation switching method, and an operation switching program.

  In a mobile communication system (for example, Personal Handy-Phone System: PHS), communication is performed by a TDMA / TDD (Time Division Multiple Access / Time Division Duplex) method. In PHS, one frame is composed of 8 slots, and is composed of 4 slots (communication direction from the radio terminal station to the radio base station) and 4 slots (communication direction from the radio base station to the radio terminal station). Usually, a common control channel (hereinafter, referred to as a common control channel) is assigned to each pair of radio terminal stations among the four pairs of uplink and downlink slots, and each radio is assigned to three pairs of slots. Separate control channels (hereinafter referred to as individual control channels) and speech channels are allocated at the terminal station. When the common control channel is represented by C and the speech channel and the dedicated control channel are represented by T, the normal frame configuration of the radio base station is a 1C3T frame configuration.

  In addition, the radio base station and the radio terminal station transmit and receive radio signals of one or a plurality of bands, and there are frames and slots for each of these bands (hereinafter referred to as radio channels).

  In addition, the wireless terminal station can communicate with the radio base station individually by receiving allocation of slots for communication channels and dedicated control channels (hereinafter referred to as communication slots) from the radio base station. Each wireless terminal station receives the downlink common control channel transmitted from the wireless base station in order to receive communication slot assignment, and acquires information on the wireless base station. Then, each wireless terminal station requests the wireless base station to allocate a communication slot by transmitting an uplink common control channel to the wireless base station based on the information of the wireless base station (hereinafter referred to as access of the wireless terminal station). .

  Here, conventionally, a radio that can be jointly configured by a master base station that uses a common control channel and a slave base station that communicates with a wireless terminal station based on the control of the master base station without using the common control channel is possible. Base station systems have been proposed. The frame configuration of the master base station is a normal frame configuration and is 1C3T. The common control channel of the master base station is commonly used by the master base station and the slave base station. Therefore, in the slave base station, a speech channel and a dedicated control channel are assigned to all four pairs of slots. That is, the normal frame configuration of the slave base station is a 4T frame configuration. Therefore, the frame configuration of the entire radio base station system is 1C7T. The combination of the frame configurations of each radio base station is one index that represents the operation mode of the radio base station system.

  In such a radio base station system of an operation mode composed of a master base station and a slave base station, since it is not necessary to assign a common control channel to the frame of the slave base station, a call channel and an individual control channel that can be assigned The number of can be increased.

Further, in the radio base station system described in Patent Document 1, the traffic volume of the downlink control channel is monitored, and the communication channel is switched to the control channel according to the result of comparing the traffic volume of the downlink control channel with a preset threshold value. . With such a configuration, control channel congestion can be prevented and a stable mobile communication service can be provided.
Japanese Patent Laid-Open No. 7-222236

  However, in the conventional radio base station system including the master base station and the slave base station, when the communication quality of the common control channel of the master base station deteriorates due to the influence of the interference wave, the slave base station Although there is no deterioration in communication quality due to influence, the slave base station cannot add a wireless terminal station as a communication partner, or the communication quality with a wireless terminal station in communication deteriorates was there. That is, when the communication quality of the master base station deteriorates, there is a problem that the communication capability and communication quality of the slave base station deteriorate.

  In addition, since the radio base station system described in Patent Document 1 is configured to switch the control channel and the communication channel of the radio base station according to the traffic amount in one radio base station, the traffic of the entire radio base station system There is a problem that it is not possible to appropriately select the operation mode of the radio base station system based on the amount.

  Therefore, an object of the present invention is to provide a radio base station system, an operation switching method, and an operation switching capable of appropriately selecting an operation mode of the radio base station system based on communication quality and traffic volume of the entire radio base station system. Is to provide a program.

  In order to solve the above problems, a radio base station system according to an aspect of the present invention includes a plurality of radio base stations that communicate with one or more radio terminal stations using a control channel and a communication channel, A master base station that is a radio base station that uses a control channel by connecting all radio base stations and a radio terminal station that uses a communication channel based on the control of the master base station without using a control channel A wireless base station system configured by slave base stations that communicate with each other, and each wireless base station includes a communication state detection unit that detects a communication state of the wireless base station, and a control channel used by the wireless base station A central control unit that performs control to change the number and the breakdown of the number of call channels, and at least one of the radio base stations further performs each of the joint operations A collection unit that collects communication states detected by the line base station, and an operation determination unit that determines the operation mode of the radio base station system that is a combination of the breakdown of each radio base station based on the communication states collected by the collection unit; An operation information output unit that outputs operation information representing the determined operation mode of the radio base station system to each radio base station, and the central control unit performs control to change the breakdown based on the operation information.

  Preferably, in the joint operation, a wireless base station system is configured by one master base station and one or more slave base stations, and the communication state detection unit is configured so that each wireless base station is a master base in the joint operation. The amount of traffic in each operation mode of the radio base station system to be a station is measured, the collection unit collects the traffic amount of each radio base station in each operation mode, and the operation determination unit is the traffic volume collected by the collection unit Are determined for each operation form, and it is determined whether or not to perform joint operation based on the total traffic volume.

  More preferably, the operation determination unit aggregates the traffic volume of each radio base station collected by the collection unit for each operation mode, and when at least one of the aggregated traffic volumes is equal to or greater than a predetermined threshold, the joint operation Decide to do.

  Preferably, in the joint operation, a wireless base station system is configured by one master base station and one or more slave base stations, and the communication state detection unit is configured so that each wireless base station is a master base in the joint operation. The amount of traffic in each operation mode of the radio base station system to be a station is measured, the collection unit collects the traffic amount of each radio base station in each operation mode, and the operation determination unit is the traffic volume collected by the collection unit For each operation mode, and select one of the operation modes based on the total traffic volume.

  More preferably, the operation determination unit totals the traffic volume collected by the collection unit for each operation mode, and selects an operation mode that maximizes the total traffic amount.

  Preferably, in the joint operation, a wireless base station system is configured by one master base station and one or more slave base stations, and the communication state detection unit is configured so that each wireless base station is a master base in the joint operation. The communication quality in each operation mode of the radio base station system as a station is measured, the collection unit collects the communication quality of each radio base station in each operation mode, and the operation determination unit is the communication quality collected by the collection unit Are selected for each operation mode, and any one of the operation modes is selected based on the calculated communication quality.

  More preferably, each radio base station further includes an interference avoidance control unit that performs interference avoidance control for changing a timing for communicating with the radio terminal station or a frequency for communicating with the radio terminal station according to communication quality with the radio terminal station. The communication state detection unit measures the number of times interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station is a master base station. The number of times of interference avoidance control of each radio base station in the operation mode is collected, and the operation determination unit totals the number of interference avoidance controls collected by the collection unit for each operation mode, and the total number of times of interference avoidance control collected is the minimum. Select the operation form.

  In addition, an operation switching method according to an aspect of the present invention includes a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and all radio base stations are connected. It consists of a master base station that is a radio base station that uses the control channel and a slave base station that communicates with the radio terminal station using the communication channel based on the control of the master base station without using the control channel The operation switching method in the radio base station system capable of joint operation, wherein each radio base station detects a communication status of the radio base station, and at least one radio base among the radio base stations A collection step in which a determination base station, which is a station, collects communication states detected in each radio base station performing joint operation; An operation determination step for determining the operation mode of the radio base station system, which is a combination of the number of control channels and the number of call channels used by each radio base station, based on the collected communication state; An operation information output step for outputting operation information representing the determined operation mode of the radio base station system to each radio base station; and a central control step for performing a control in which each radio base station changes a breakdown based on the operation information; including.

  Preferably, in the joint operation, one master base station and one or a plurality of slave base stations form a wireless base station system, and in the communication state detection step, each wireless base station is a master in the joint operation. Measure the traffic volume in each operation mode of the radio base station system to be a base station, collect the traffic volume of each radio base station in each operation mode in the collection step, and collect in the collection step in the operation determination step The total traffic volume is totaled for each operation mode, and it is determined whether or not to perform joint operation based on the total traffic volume.

  More preferably, in the operation determination step, the traffic volume of each radio base station collected in the collection step is totaled for each operation mode, and when at least one of the total traffic volumes is equal to or greater than a predetermined threshold value Decide to collaborate.

  Preferably, in the joint operation, one master base station and one or a plurality of slave base stations form a wireless base station system, and in the communication state detection step, each wireless base station is a master in the joint operation. Measure the traffic volume in each operation mode of the radio base station system to be a base station, collect the traffic volume of each radio base station in each operation mode in the collection step, and collect in the collection step in the operation determination step The total traffic volume is totaled for each operation mode, and one of the respective operation modes is selected based on the total traffic volume.

  More preferably, in the operation determination step, the traffic amount collected in the collection step is totaled for each operation mode, and the operation mode that maximizes the total traffic amount is selected.

  Preferably, in the joint operation, one master base station and one or a plurality of slave base stations form a wireless base station system, and in the communication state detection step, each wireless base station is a master in the joint operation. Measure the communication quality in each operation mode of the radio base station system to be the base station, collect the communication quality of each radio base station in each operation mode in the collection step, and collect in the collection step in the operation determination step The collected communication quality is totaled for each operation mode, and any one of the operation modes is selected based on the total communication quality.

  More preferably, the operation switching method includes interference avoidance control for performing interference avoidance control in which each wireless base station changes the timing of communication with the wireless terminal station or the frequency of communication with the wireless terminal station according to the communication quality with the wireless terminal station. The communication state detection step further includes measuring and collecting the number of times interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station is a master base station. In the step, the frequency of interference avoidance control of each radio base station in each operation mode is collected, and in the operation determination step, the number of interference avoidance controls collected in the collection step is totaled for each operation mode, and the total interference The operation mode that minimizes the number of avoidance controls is selected.

  An operation switching program according to an aspect of the present invention includes a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and all radio base stations are connected. It consists of a master base station that is a radio base station that uses the control channel and a slave base station that communicates with the radio terminal station using the communication channel based on the control of the master base station without using the control channel An operation switching program in a wireless base station system capable of joint operation, wherein each wireless base station detects a communication state of the wireless base station, and at least one of the wireless base stations. A collection step in which a determination base station, which is one radio base station, collects communication states detected by the radio base stations performing joint operation; Operation determination step in which the determination base station determines the operation mode of the radio base station system, which is a combination of the number of control channels and the number of call channels used by each radio base station, based on the communication state collected in the collection step And an operation information output step in which the determination base station outputs operation information indicating the determined operation mode of the radio base station system to each radio base station, and a control in which each radio base station changes the breakdown based on the operation information And a central control step for performing.

  Preferably, in the joint operation, one master base station and one or a plurality of slave base stations form a wireless base station system, and in the communication state detection step, each wireless base station is a master in the joint operation. Measure the traffic volume in each operation mode of the radio base station system to be a base station, collect the traffic volume of each radio base station in each operation mode in the collection step, and collect in the collection step in the operation determination step The total traffic volume is totaled for each operation mode, and it is determined whether or not to perform joint operation based on the total traffic volume.

  More preferably, in the operation determination step, the traffic volume of each radio base station collected in the collection step is totaled for each operation mode, and when at least one of the total traffic volumes is equal to or greater than a predetermined threshold value Decide to collaborate.

  Preferably, in the joint operation, one master base station and one or a plurality of slave base stations form a wireless base station system, and in the communication state detection step, each wireless base station is a master in the joint operation. Measure the traffic volume in each operation mode of the radio base station system to be a base station, collect the traffic volume of each radio base station in each operation mode in the collection step, and collect in the collection step in the operation determination step The total traffic volume is totaled for each operation mode, and one of the respective operation modes is selected based on the total traffic volume.

  More preferably, in the operation determination step, the traffic amount collected in the collection step is totaled for each operation mode, and the operation mode that maximizes the total traffic amount is selected.

  Preferably, in the joint operation, one master base station and one or a plurality of slave base stations form a wireless base station system, and in the communication state detection step, each wireless base station is a master in the joint operation. Measure the communication quality in each operation mode of the radio base station system to be the base station, collect the communication quality of each radio base station in each operation mode in the collection step, and collect in the collection step in the operation determination step The collected communication quality is totaled for each operation mode, and any one of the operation modes is selected based on the total communication quality.

  More preferably, the operation switching program further causes the computer to perform interference avoidance control for changing a timing at which each radio base station communicates with the radio terminal station or a frequency at which the radio terminal station communicates according to communication quality with the radio terminal station. In the communication state detection step, the number of times the interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station is a master base station is performed. Measure each, collect the number of interference avoidance control of each radio base station in each operation mode in the collection step, and total the number of interference avoidance control collected in the collection step for each operation mode in the operation determination step The operation mode that minimizes the total number of times of interference avoidance control is selected.

  In order to solve the above problems, a radio base station system according to another aspect of the present invention includes a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel. It is composed of one control station that controls each radio base station, and all the radio base stations are connected to each other without using the master base station and the control channel, which are radio base stations that use the control channel. It is a radio base station system capable of joint operation composed of slave base stations that communicate with radio terminal stations using a communication channel based on control of a master base station, and each radio base station communicates with a radio base station A communication state detection unit that detects a state, and a central control unit that performs control to change a breakdown of the number of control channels and the number of call channels used by the radio base station. An operation for determining the operation mode of the radio base station system, which is a combination of the breakdown of each radio base station, based on the communication status collected by the collection unit and the collection unit that collects the communication state detected by each radio base station A determination unit; and an operation information output unit that outputs operation information representing the determined operation mode of the radio base station system to each radio base station. The central control unit performs control to change the breakdown based on the operation information .

  Preferably, in joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system, and the communication state detection unit Each radio base station in each operation mode of the radio base station system in which each radio base station is a master base station, and the collection unit collects the traffic volume of each radio base station in each operation mode, and the operation determination unit Adds up the traffic volume collected by the collection unit for each operation mode, and determines whether or not to perform joint operation based on the total traffic volume.

  More preferably, the operation determination unit aggregates the traffic volume of each radio base station collected by the collection unit for each operation mode, and when at least one of the aggregated traffic volumes is equal to or greater than a predetermined threshold, the joint operation Decide to do.

  Preferably, in joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system, and the communication state detection unit Each radio base station in each operation mode of the radio base station system in which each radio base station is a master base station, and the collection unit collects the traffic volume of each radio base station in each operation mode, and the operation determination unit Adds up the traffic volume collected by the collection unit for each operation mode, and selects one of the operation modes based on the total traffic volume.

  More preferably, the operation determination unit totals the traffic volume collected by the collection unit for each operation mode, and selects an operation mode that maximizes the total traffic amount.

  Preferably, in joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system, and the communication state detection unit Each radio base station measures the communication quality in each operation mode of the radio base station system where each radio base station is a master base station, and the collection unit collects the communication quality of each radio base station in each operation mode, and the operation determination unit Adds up the communication quality collected by the collection unit for each operation mode, and selects one of the operation modes based on the calculated communication quality.

  More preferably, each radio base station further includes an interference avoidance control unit that performs interference avoidance control for changing a timing for communicating with the radio terminal station or a frequency for communicating with the radio terminal station according to communication quality with the radio terminal station. The communication state detection unit measures the number of times interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station is a master base station. The number of times of interference avoidance control of each radio base station in the operation mode is collected, and the operation determination unit totals the number of interference avoidance controls collected by the collection unit for each operation mode, and the total number of times of interference avoidance control collected is the minimum. Select the operation form.

  An operation switching method according to another aspect of the present invention includes a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and control each radio base station. Based on the control of the master base station without using the control channel and the master base station, which is a radio base station that uses the control channel by connecting all the radio base stations. This is an operation switching method in a radio base station system that can be operated jointly, which is composed of slave base stations that communicate with radio terminal stations using a communication channel. Each radio base station detects the communication status of the radio base station. A communication state detection step, a control station collects the communication state detected in each radio base station performing joint operation, and a control station collects in the collection step Based on the determined communication state, an operation determination step for determining an operation mode of the radio base station system, which is a combination of the number of control channels and the number of call channels used by each radio base station, and the radio determined by the control station An operation information output step for outputting operation information representing an operation mode of the base station system to each radio base station, and a central control step for performing control in which each radio base station changes the breakdown based on the operation information.

  Preferably, in the joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system. In operation, each radio base station measures the traffic volume in each operation mode of the radio base station system, which is a master base station, and in the collection step, the traffic volume of each radio base station in each operation mode is collected and operated In the determination step, the traffic volume collected in the collection step is totaled for each operation mode, and it is determined whether or not to perform joint operation based on the total traffic volume.

  More preferably, in the operation determination step, the traffic volume of each radio base station collected in the collection step is totaled for each operation mode, and when at least one of the total traffic volumes is equal to or greater than a predetermined threshold value Decide to collaborate.

  Preferably, in the joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system. In operation, each radio base station measures the traffic volume in each operation mode of the radio base station system, which is a master base station, and in the collection step, the traffic volume of each radio base station in each operation mode is collected and operated In the determination step, the traffic volume collected in the collection step is totaled for each operation mode, and any one of the operation modes is selected based on the total traffic volume.

  More preferably, in the operation determination step, the traffic amount collected in the collection step is totaled for each operation mode, and the operation mode that maximizes the total traffic amount is selected.

  Preferably, in the joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system. In operation, each radio base station measures the communication quality in each operation mode of the radio base station system, which is the master base station, and in the collection step, the communication quality of each radio base station in each operation mode is collected and operated In the determination step, the communication quality collected in the collection step is totaled for each operation mode, and any one of the operation modes is selected based on the total communication quality.

  More preferably, the operation switching method includes interference avoidance control for performing interference avoidance control in which each wireless base station changes the timing of communication with the wireless terminal station or the frequency of communication with the wireless terminal station according to the communication quality with the wireless terminal station. The communication state detection step further includes measuring and collecting the number of times interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station is a master base station. In the step, the frequency of interference avoidance control of each radio base station in each operation mode is collected, and in the operation determination step, the number of interference avoidance controls collected in the collection step is totaled for each operation mode, and the total interference The operation mode that minimizes the number of avoidance controls is selected.

  An operation switching program according to another aspect of the present invention controls a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and each radio base station. Based on the control of the master base station without using the control channel and the master base station, which is a radio base station that uses the control channel by connecting all the radio base stations. An operation switching program in a radio base station system capable of joint operation configured by slave base stations that communicate with a radio terminal station using a communication channel, wherein each radio base station communicates with a radio base station A communication state detecting step for detecting a state, a collecting step for collecting a communication state detected by each radio base station in which the control station performs joint operation, and a control station An operation determination step for determining an operation mode of the radio base station system, which is a combination of the number of control channels and the number of call channels used by each radio base station, based on the communication state collected in the collection step; However, the operation information output step for outputting the operation information representing the determined operation mode of the radio base station system to each radio base station, and the central control step for performing the control in which each radio base station changes the breakdown based on the operation information And execute.

  Preferably, in the joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system. In operation, each radio base station measures the traffic volume in each operation mode of the radio base station system, which is a master base station, and in the collection step, the traffic volume of each radio base station in each operation mode is collected and operated In the determination step, the traffic volume collected in the collection step is totaled for each operation mode, and it is determined whether or not to perform joint operation based on the total traffic volume.

  More preferably, in the operation determination step, the traffic volume of each radio base station collected in the collection step is totaled for each operation mode, and when at least one of the total traffic volumes is equal to or greater than a predetermined threshold value Decide to collaborate.

  Preferably, in the joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system. In operation, each radio base station measures the traffic volume in each operation mode of the radio base station system, which is a master base station, and in the collection step, the traffic volume of each radio base station in each operation mode is collected and operated In the determination step, the traffic volume collected in the collection step is totaled for each operation mode, and any one of the operation modes is selected based on the total traffic volume.

  More preferably, in the operation determination step, the traffic amount collected in the collection step is totaled for each operation mode, and the operation mode that maximizes the total traffic amount is selected.

  Preferably, in the joint operation, one master base station, one or a plurality of slave base stations, and one control station constitute a radio base station system. In operation, each radio base station measures the communication quality in each operation mode of the radio base station system, which is the master base station, and in the collection step, the communication quality of each radio base station in each operation mode is collected and operated In the determination step, the communication quality collected in the collection step is totaled for each operation mode, and any one of the operation modes is selected based on the total communication quality.

  More preferably, the operation switching program further causes the computer to perform interference avoidance control for changing a timing at which each radio base station communicates with the radio terminal station or a frequency at which the radio terminal station communicates according to communication quality with the radio terminal station. In the communication state detection step, the number of times the interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station is a master base station is performed. Measure each, collect the number of interference avoidance control of each radio base station in each operation mode in the collection step, and total the number of interference avoidance control collected in the collection step for each operation mode in the operation determination step The operation mode that minimizes the total number of times of interference avoidance control is selected.

  According to the present invention, the operation mode of the radio base station system can be appropriately selected based on the communication quality and traffic volume of the entire radio base station system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
[Constitution]
FIG. 1 is a configuration diagram of a radio base station system according to the first embodiment.

  Referring to FIG. 1, this radio base station system includes a radio base station 201, a radio base station 202, and a radio base station 203.

  The radio base station 201 to the radio base station 203 are connected in cascade, and the radio base station 201 to the radio base station 203 are each connected to an I ′ (ISDN: Integrated Services Digital Network) line.

  The radio base station 201 to the radio base station 203 communicate with each radio terminal station (not shown) by the TDMA / TDD method.

  FIG. 2 is a functional block diagram showing a configuration of the radio base station in the radio base station system according to the first embodiment.

  Referring to the figure, this radio base station includes an antenna 1, a switch 2, a receiving unit 3, a demodulating unit 4, a central control unit 5, a line control unit 6, an interface unit 7, and a modulation unit. 8, a transmission unit 9, a collection unit 12, an operation determination unit 13, a wireless signal processing unit 101, and a communication state detection unit 102.

  The radio signal processing unit 101 includes a communication slot processing unit 14 and a control slot processing unit 15.

  The communication state detection unit 102 includes a traffic measurement unit 10.

[Upward basic operation]
The antenna 1 outputs a radio signal received from the radio terminal station to the switch 2.

  The switch 2 switches whether to output a radio signal received from the antenna 1 to the reception unit 3 or to output a transmission signal received from the transmission unit 9 to the antenna 1 according to a control signal (not shown).

  The receiving unit 3 extracts a signal of a radio channel specified by a control signal (not shown) from each radio channel signal included in a radio signal in an RF (Radio Frequency) band received from the switch 2 and converts it into a baseband signal. Convert frequency. Then, the reception unit 3 converts the baseband signal that is an analog signal into reception data that is a digital signal, and outputs the received data to the demodulation unit 4.

  The demodulator 4 demodulates the received data received from the receiver 3 and outputs the demodulated data to the communication slot processor 14 and the control slot processor 15 as demodulated data.

  The communication slot processing unit 14 extracts the demodulated data in the communication slot in use from the demodulated data received from the demodulating unit 4, and performs various signal processing on the demodulated data corresponding to the uplink communication channel from the extracted demodulated data. And output to the central control unit 5. Here, the signal processing refers to, for example, error correction decoding processing or processing such as conversion of a speech coding scheme when the demodulated data is speech data.

  The central control unit 5 receives the reception data signal-processed in the communication slot processing unit 14, performs processing for inserting the reception data in each communication slot into the data frame for the I 'line, and performs line control on the data frame. Output to unit 6.

  The line control unit 6 performs communication protocol processing with the I ′ line and outputs the data frame received from the central control unit 5 to the I ′ line.

[Descent basic operation]
The line control unit 6 performs communication protocol processing with the I ′ line and outputs a data frame received from the I ′ line to the central control unit 5.

  The central control unit 5 performs processing for converting the data frame received from the line control unit 6 into data to be transmitted in the communication slot, and outputs the converted transmission data to the communication slot processing unit 14.

  The communication slot processing unit 14 performs various signal processing on the transmission data received from the central control unit 5 and outputs it to the modulation unit 8 as a downlink communication channel. Here, the signal processing refers to, for example, error correction encoding processing or processing such as conversion of an audio encoding scheme when transmission data is audio data. Further, the communication slot processing unit 14 generates a downlink dedicated control channel and outputs it to the modulation unit 8.

  The control slot processing unit 15 generates a downlink common control channel and outputs it to the modulation unit 8.

  Modulator 8 modulates the downlink communication channel and downlink dedicated control channel received from communication slot processor 14 and the downlink common control channel received from control slot processor 15, and outputs the modulated data to transmitter 9.

  The transmission unit 9 converts the modulation data, which is a digital signal received from the modulation unit 8, into an analog signal, amplifies the transmission signal obtained by frequency-converting the analog signal into the RF band, and outputs the amplified signal to the switch 2.

  The switch 2 switches whether to output a radio signal received from the antenna 1 to the reception unit 3 or to output a transmission signal received from the transmission unit 9 to the antenna 1 according to a control signal (not shown).

  The antenna 1 transmits the transmission signal received from the switch 2 to the wireless terminal station as a wireless signal.

  Hereinafter, the operation for determining the operation mode of the radio base station system according to the present embodiment will be described.

[Basic operations related to determination of operation mode]
The communication slot processing unit 14 detects a release request by the wireless terminal station of the communication slot in use from the demodulated data corresponding to the uplink dedicated control channel among the extracted demodulated data. Then, the communication slot processing unit 14 outputs resource release information indicating the content of the communication slot release request to the traffic measurement unit 10.

  The control slot processing unit 15 extracts an uplink common control channel, which is demodulated data in a common control channel slot (hereinafter referred to as a control slot), from the demodulated data received from the demodulator 4, and performs communication by the radio terminal station. A slot allocation request is detected. Then, the control slot processing unit 15 outputs resource request information indicating the content of the communication slot allocation request to the traffic measurement unit 10.

  Based on the resource release information received from the communication slot processing unit 14 and the resource request information received from the control slot processing unit 15, the traffic measurement unit 10 measures the traffic amount of this radio base station. More specifically, the traffic measurement unit 10 measures the number of accesses from a wireless terminal station or the usage rate of a communication slot during a predetermined period. Then, the traffic measurement unit 10 outputs the measured traffic amount to the collection unit 12.

  Since the slave base station has a 4T frame structure and does not transmit / receive the common control channel, the master base station notifies the slave base station via the interface unit 7 of the communication slot allocation request. Also, the communication slot release request detected by the slave base station is notified to the master base station via the interface unit 7, and the master base station grasps the communication slot usage status of each radio base station. With this configuration, the slave base station can communicate with the wireless terminal station by allocating communication slots based on the control of the master base station without using the common control channel.

  The collection unit 12 collects the traffic volume received from the traffic measurement unit 10 and the traffic volume of other radio base stations received from the central control unit 5, and outputs the collected traffic volume of each radio base station to the operation determination unit 13. To do. The collection unit 12 outputs the traffic volume received from the traffic measurement unit 10 to the central control unit 5.

  Based on the traffic volume of each radio base station received from the collection unit 12, the operation determination unit 13 performs joint operation or performs independent operation in which each radio base station communicates with a radio terminal station using a common control channel. Select whether to do it.

  Further, when performing joint operation, the operation determination unit 13 determines whether to operate each radio base station as a master base station or a slave base station based on the traffic volume of each radio base station.

  Here, in the radio base station system according to the present embodiment, one of the radio base stations is set to the radio base station system by the system supplier or the system administrator setting the radio base station. In other words, operation determination is performed, that is, selection of single operation and joint operation of the radio base station system, and selection of operation as a master base station and operation as a slave base station of each radio base station. In the following, a radio base station that performs operation determination in the radio base station system according to the present embodiment is referred to as a determination base station, and a radio base station that does not perform operation determination is referred to as a non-determination base station.

  Next, an operation when the radio base station performs operation determination in the radio base station system according to the present embodiment will be described with reference to the drawings.

[Operation]
FIG. 3 is a flowchart defining the operation procedure of the radio base station system according to the present embodiment. The central control unit 5, the line control unit 6, the interface unit 7, the traffic measurement unit 10, the collection unit 12, the operation determination unit 13, and the wireless signal processing unit 101 are programs including steps in the flowchart. Read from a memory (not shown) and execute. This program can be installed externally.

  When activated, the radio base station system according to the present embodiment starts measuring and collecting the traffic amount of each radio base station in each operation mode in which each radio base station is operated as a master base station.

  First, the central control unit 5 in the determination base station outputs the operation information representing the operation mode that is a joint operation and uses one radio base station as a master base station in the radio base station system to the interface unit 7. The interface unit 7 outputs the operation information received from the central control unit 5 to the non-decision base station (S1).

  That is, the determination base station outputs operation information indicating an operation mode in which communication with the wireless terminal station is performed with a 1C3T frame configuration to a non-determination base station that is a master base station, and non-determination that is a slave base station The base station outputs operation information representing an operation mode in which communication with the wireless terminal station is performed with a 4T frame configuration (S1).

  Similarly, the central control unit 5 in the determination base station uses the control signal (not shown) for communication information indicating an operation mode in which communication is performed with the wireless terminal station in the 1C3T frame configuration or the 4T frame configuration for communication in the determination base station. The data is output to the slot processing unit 14 and the control slot processing unit 15 (S2).

  The central control unit 5 in the non-determination base station receives the operation information from the determination base station via the interface unit 7 and, like the central control unit 5 in the determination base station, wirelessly with a 1C3T frame configuration or a 4T frame configuration. Operation information representing an operation mode for performing communication with the terminal station is output to the communication slot processing unit 14 and the control slot processing unit 15 in the non-determined base station by a control signal (not shown) (S14).

  The communication slot processing unit 14 and the control slot processing unit 15 in the determination base station and the non-determination base station communicate with the wireless terminal station in a frame configuration represented by a control signal (not shown) received from the central control unit 5 (S2). And S14).

  Here, assuming that the determination base station is the radio base station 201 and the non-determination base stations are the radio base station 202 and the radio base station 203, the radio base station 201 (determination base station) and the radio base station 203 (non-determination base station) Operation information is notified to the radio base station 203 (non-determined base station) via the radio base station 202 (non-determined base station). In this case, the central control unit 5 in the radio base station 202 (non-decision base station) transfers the operation information received from the radio base station 201 (determination base station) to the radio base station 203 (non-determination base station).

  Next, the traffic measurement unit 10 in the determination base station and the non-determination base station uses the radio base station based on the resource release information received from the communication slot processing unit 14 and the resource request information received from the control slot processing unit 15. Measure the traffic volume of the station. Then, the traffic measurement unit 10 outputs the measured traffic volume to the collection unit 12 (S3 and S15).

  The collection unit 12 in the non-decision base station outputs the traffic amount received from the traffic measurement unit 10 to the central control unit 5 (S16).

  The central control unit 5 in the non-decision base station outputs the traffic amount received from the collection unit 12 to the interface unit 7 (S16).

  The interface unit 7 in the non-decision base station outputs the traffic amount received from the central control unit 5 to the decision base station directly or via another non-determination base station (S16).

  The central control unit 5 in the determination base station outputs the traffic volume of the non-determination base station received via the interface unit 7 to the collection unit 12 (S4).

  The collection unit 12 in the determination base station collects the traffic amount received from the traffic measurement unit 10 and the traffic amount of the non-determination base station received from the central control unit 5, and the collected traffic amount of each radio base station is determined as an operation determination unit. 13 (S4).

  When there is an operation mode in which the measurement and collection of the traffic amount of each radio base station is not completed (NO in S5), the central control unit 5 in the determination base station is not yet a master base station 1 The operation information indicating the operation mode in which the radio base station is the master base station is output to the communication slot processing unit 14 and the control slot processing unit 15 in the determination base station by a control signal (not shown). In addition, the central control unit 5 in the determination base station outputs operation information representing an operation mode in which one radio base station that is not yet a master base station is a master base station to the non-determination base station via the interface unit 7. (S6).

  The operation determination unit 13 in the determination base station completes measurement and collection of the traffic amount of each radio base station for all operation modes, that is, in each operation mode in which each radio base station is operated as a master base station. When all the traffic volume of each radio base station is received from the collection unit 12 (YES in S5), based on the traffic volume of each radio base station received from the collection unit 12, a joint operation or a single operation is performed. It is selected whether to perform (S7 to S9 and S11).

  More specifically, the operation determination unit 13 in the determination base station adds up the traffic amount of each radio base station received from the collection unit 12 for each operation mode (S7). And the operation | movement determination part 13 selects joint operation, when at least 1 becomes more than a predetermined threshold among each traffic amount totaled for every operation form (S8 YES) (S9). In addition, the operation determining unit 13 selects the single operation (S11) when none of the traffic amounts aggregated for each operation mode is equal to or greater than the predetermined threshold (NO in S8).

  Then, the operation determination unit 13 in the determination base station determines whether to operate each radio base station as a master base station or as a slave base station based on the traffic volume of each radio base station when performing joint operation. Judging. More specifically, the operation determining unit 13 in the determination base station selects an operation mode in which the total traffic amount is maximized when performing joint operation (S10).

  The operation determination unit 13 in the determination base station outputs operation information representing the operation mode of each radio base station to the central control unit 5 (S12).

  The central control unit 5 in the determination base station outputs the operation information received from the operation determination unit 13 to the interface unit 7 (S12).

  The interface unit 7 outputs the operation information received from the central control unit 5 to the non-decision base station via the interface unit 7 (S12).

  That is, the central control unit 5 in the determination base station receives the operation information from the operation determination unit 13, and each radio base station in the case of performing independent operation or the non-determination base that becomes a master base station in the case of performing joint operation The station outputs operation information representing an operation mode in which communication with the wireless terminal station is performed with a 1C3T frame configuration. In addition, the central control unit 5 in the determination base station is an operation that represents a mode of operation in which communication with a wireless terminal station is performed with a 4T frame configuration for a non-determination base station that is a slave base station when performing joint operation. Information is output (S12).

  Similarly, the central control unit 5 in the determination base station uses the control signal (not shown) for communication information indicating an operation mode in which communication is performed with the wireless terminal station in the 1C3T frame configuration or the 4T frame configuration for communication in the determination base station. The data is output to the slot processing unit 14 and the control slot processing unit 15 (S13).

  The central control unit 5 in the non-determination base station receives the operation information from the determination base station via the interface unit 7 and, like the central control unit 5 in the determination base station, wirelessly with a 1C3T frame configuration or a 4T frame configuration. Operation information representing an operation mode for performing communication with the terminal station is output to the communication slot processing unit 14 and the control slot processing unit 15 in the non-determined base station by a control signal (not shown) (S17).

  The communication slot processing unit 14 and the control slot processing unit 15 in the determination base station and the non-determination base station communicate with the wireless terminal station in a frame configuration represented by a control signal (not shown) received from the central control unit 5 (S13). And S17).

  Note that the operation information is not limited to information indicating the frame configuration such as 1C3T and 4T, but may be information indicating a master base station or a slave base station. In this case, the communication slot processing unit 14 and the control slot processing unit 15 in each radio base station recognize the frame configuration of the master base station and the frame configuration of the slave base station in advance by a method such as storing them in a memory (not shown). ing. The communication slot processing unit 14 and the control slot processing unit 15 in each radio base station can communicate with the radio terminal station with a frame configuration corresponding to the master base station or slave base station represented by the operation information. .

  By the way, in the radio base station system composed of the conventional master base station and slave base station, when the communication quality of the common control channel of the master base station deteriorates due to the influence of interference waves, the slave base station Although there is no deterioration in communication quality due to influence, the slave base station cannot add a wireless terminal station as a communication partner, or the communication quality with a wireless terminal station in communication deteriorates was there. That is, when the communication quality of the master base station deteriorates, there is a problem that the communication capability and communication quality of the slave base station deteriorate.

  However, in the radio base station system according to the present embodiment, operation determination unit 13 in the determination base station totals the traffic amount of each radio base station received from collection unit 12 for each operation mode. If at least one of the traffic amounts aggregated for each operation mode is equal to or greater than a predetermined threshold, it is highly necessary to perform joint operation and increase the number of call channels and dedicated control channels. The operation determination unit 13 selects a joint operation. Also, if each traffic volume aggregated for each operation mode does not exceed the predetermined threshold, it is less necessary to perform joint operation and increase the number of call channels and dedicated control channels. When the determination unit 13 selects the single operation, the problem associated with the joint operation, that is, the problem of the wireless base station system including the above-described conventional master base station and slave base station can be avoided.

  In addition, since the radio base station system described in Patent Document 1 is configured to switch the control channel and the communication channel of the radio base station according to the traffic amount in one radio base station, the traffic of the entire radio base station system There is a problem that it is not possible to appropriately select the operation mode of the radio base station system based on the amount.

  However, in the radio base station system according to the present embodiment, operation determination unit 13 in the determination base station totals the traffic amount of each radio base station received from collection unit 12 for each operation mode. Then, the operation determination unit 13 selects whether to perform joint operation or single operation based on the aggregated traffic amounts.

  Further, when performing joint operation, the operation determining unit 13 determines whether to operate each radio base station as a master base station or a slave base station based on the total traffic amount.

  Therefore, in the radio base station system according to the present embodiment, the operation mode of the radio base station system is appropriately selected by determining the operation mode of the radio base station system based on the traffic amount of the entire radio base station system. be able to.

  In addition, if the radio base station system is operated independently, even if the entire radio base station system has a large amount of traffic, if the shared operation is performed, the received power of the common control channel in the radio base station or each radio terminal station is operated independently. When it becomes smaller than the case, the number of wireless terminal stations that can communicate with the wireless base station decreases, and instead the communication capability of the wireless base station system decreases.

  Therefore, in the radio base station system according to the present embodiment, based on the traffic volume of each radio base station in each operation mode that is joint operation and one radio base station in the radio base station system is a master base station. Select whether to perform joint operation or single operation. Therefore, in the radio base station system according to the present embodiment, the operation mode of the radio base station system is further determined by determining the operation mode of the radio base station system based on the traffic volume of the entire radio base station system in the joint operation. You can choose appropriately.

  Next, another embodiment of the present invention will be described with reference to the drawings.

<Second Embodiment>
[Constitution]
The configuration of the radio base station system according to the second embodiment is the same as the configuration of the radio base station system according to the first embodiment shown in FIG.

  FIG. 4 is a functional block diagram showing a configuration of the radio base station in the radio base station system according to the second embodiment.

  With reference to the figure, this radio base station includes a radio signal processing unit 101 further including an interference avoidance control unit 16 for the radio base station in the radio base station system according to the first embodiment, The communication state detection unit 102 further includes a communication quality measurement unit 11.

  Hereinafter, the operation for determining the operation mode of the radio base station system according to the present embodiment will be described.

[Basic operations related to determination of operation mode]
The communication slot processing unit 14 performs error detection such as CRC (Cyclic Redundancy Check) on the communication slot in use, and outputs an error detection result to the interference avoidance control unit 16.

  The interference avoidance control unit 16 receives the error detection result from the communication slot processing unit 14 and measures the error detection rate for each wireless terminal station that is a communication partner. Then, the interference avoidance control unit 16 compares the error detection rate with a predetermined threshold, and if the error detection rate is equal to or higher than the predetermined threshold, the interference avoidance command is transmitted to the communication slot processing unit 14 and the communication quality measurement unit. 11 to output.

  The communication slot processing unit 14 receives an interference avoidance command from the interference avoidance control unit 16 and performs interference avoidance processing for switching the allocation of the communication channel and the dedicated control channel of the wireless terminal station to an unused communication slot. That is, the communication slot processing unit 14 changes the timing of communication with the radio terminal station by switching to a different communication slot in the same radio channel, or switches to a communication slot in a different radio channel to change the radio terminal station. The process which changes at least any one among the timing and the frequency which communicate with is performed.

  The communication quality measurement unit 11 receives the interference avoidance command from the interference avoidance control unit 16, measures the number of times that the communication slot processing unit 14 has performed the interference avoidance processing in a predetermined period, and determines the measured number of interference avoidance processes. Output to the collection unit 12.

  The collection unit 12 collects the traffic volume received from the traffic measurement unit 10 and the number of interference avoidance processes received from the communication quality measurement unit 11 and the traffic volume and the number of interference avoidance processes of other radio base stations received from the central control unit 5. Then, the collected traffic amount and the number of interference avoidance processes of each radio base station are output to the operation determination unit 13. Further, the collection unit 12 outputs the traffic amount received from the traffic measurement unit 10 and the number of interference avoidance processes received from the communication quality measurement unit 11 to the central control unit 5.

  The operation determination unit 13 selects whether to perform joint operation or single operation based on the traffic amount of each radio base station received from the collection unit 12.

  Further, when performing joint operation, the operation determining unit 13 determines whether to operate each radio base station as a master base station or a slave base station based on the number of interference avoidance processes of each radio base station. To do.

  Other configurations and basic operations are the same as those of the radio base station system according to the first embodiment.

  Next, an operation when the radio base station performs operation determination in the radio base station system according to the present embodiment will be described with reference to the drawings.

[Operation]
FIG. 5 is a flowchart defining the operation procedure of the radio base station system according to the present embodiment. Step S21, step S22, step S32 to step S34 and step S37 are the same as step S1, step S2, step S12 to step S14 and step S17 in the flowchart shown in FIG.

  The central control unit 5, the line control unit 6, the interface unit 7, the traffic measurement unit 10, the communication quality measurement unit 11, the collection unit 12, the operation determination unit 13, and the radio signal processing unit 101 are flowcharts. A program including these steps is read from a memory (not shown) and executed. This program can be installed externally.

  When activated, the radio base station system according to the present embodiment measures and collects the traffic volume and the number of interference avoidance processes of each radio base station in each operation mode in which each radio base station is operated as a master base station. To start.

  Based on the resource release information received from the communication slot processing unit 14 and the resource request information received from the control slot processing unit 15, the traffic measurement unit 10 in the determination base station and the non-determination base station Measure the amount. Then, the traffic measurement unit 10 outputs the measured traffic volume to the collection unit 12 (S23 and S35).

  The communication quality measurement unit 11 in the determination base station and the non-determination base station receives the interference avoidance command from the interference avoidance control unit 16 and measures the number of times that the communication slot processing unit 14 performs the interference avoidance processing in a predetermined period. Then, the measured number of interference avoidance processes is output to the collection unit 12 (S23 and S35).

  The collection unit 12 in the non-decision base station outputs the traffic amount received from the traffic measurement unit 10 and the number of interference avoidance processes received from the communication quality measurement unit 11 to the central control unit 5 (S36).

  The central control unit 5 in the non-decision base station outputs the traffic amount received from the collection unit 12 and the number of interference avoidance processes to the interface unit 7 (S36).

  The interface unit 7 in the non-decision base station outputs the traffic amount and the number of interference avoidance processes received from the central control unit 5 to the decision base station directly or via another non-decision base station (S36).

  The central control unit 5 in the determination base station outputs the traffic amount of the non-determination base station received via the interface unit 7 and the number of interference avoidance processes to the collection unit 12 (S24).

  The collection unit 12 in the determination base station includes the traffic amount received from the traffic measurement unit 10 and the number of interference avoidance processes received from the communication quality measurement unit 11, and the traffic amount and interference avoidance process of the non-determination base station received from the central control unit 5. The number is collected, and the collected traffic amount and the number of interference avoidance processes of each radio base station are output to the operation determination unit 13 (S24).

  When there is an operation mode in which measurement and collection of the traffic volume and the number of interference avoidance processes of each radio base station are not completed (NO in S25), the central control unit 5 in the determination base station is still a master base station. Operation information indicating an operation mode in which one radio base station not being a master base station is output to a communication slot processing unit 14 and a control slot processing unit 15 in the determination base station by a control signal (not shown). In addition, the central control unit 5 in the determination base station outputs operation information representing an operation mode in which one radio base station that is not yet a master base station is a master base station to the non-determination base station via the interface unit 7. (S26).

  The operation determination unit 13 in the determination base station completes measurement and collection of the traffic amount and the number of interference avoidance processes of each radio base station for all operation modes, that is, each radio base station is operated as a master base station. When all the traffic volume and the number of interference avoidance processes in each operation mode are received from the collection unit 12 (YES in S25), based on the traffic volume of each radio base station received from the collection unit 12 Then, it is selected whether to perform joint operation or single operation (S27 to S29 and S31).

  More specifically, the operation determination unit 13 in the determination base station totals the traffic volume and the number of interference avoidance processes received from the collection unit 12 for each operation mode (S27). And the operation | movement determination part 13 selects joint operation, when at least 1 becomes more than a predetermined threshold among each traffic amount totaled for every operation form (it is YES at S28) (S29). In addition, the operation determining unit 13 selects the single operation (S31) when none of the traffic amounts aggregated for each operation mode is equal to or greater than the predetermined threshold (NO in S28).

  Then, the operation determining unit 13 in the determination base station operates each radio base station as a master base station or operates as a slave base station based on the number of interference avoidance processes of each radio base station when performing joint operation. Judge whether to do. More specifically, when performing joint operation, the operation determination unit 13 in the determination base station selects an operation mode that minimizes the total number of interference avoidance processes (S30).

  Therefore, in the radio base station system according to the present embodiment, as in the radio base station system according to the first embodiment, the operation mode of the radio base station system is determined based on the traffic amount of the entire radio base station system. By doing so, it is possible to appropriately select the operation mode of the radio base station system.

  Further, when performing joint operation, the operation determining unit 13 in the determination base station operates each radio base station as a master base station or as a slave base station based on the number of interference avoidance processes of each radio base station. Judge whether to operate.

  Therefore, in the radio base station system according to the present embodiment, the operation mode of the radio base station system is appropriately determined by determining the operation mode of the radio base station system based on the traffic amount and communication quality of the entire radio base station system. Can be selected.

  Further, in the radio base station system according to the present embodiment, as in the radio base station system according to the first embodiment, the operation of the radio base station system is based on the traffic volume of the entire radio base station system in joint operation. By determining the form, the operation form of the radio base station system can be switched more appropriately.

  Next, another embodiment of the present invention will be described with reference to the drawings.

<Third Embodiment>
[Constitution]
FIG. 6 is a configuration diagram of a radio base station system according to the third embodiment.

  With reference to the figure, this radio base station system includes radio base stations 301 to 303 and a control station 401.

  The radio base station 301 to the radio base station 303 are connected in cascade, and the radio base station 301 to the radio base station 303 are each connected to an I ′ line.

  Further, the control station 401 is connected to the I ′ line, and the radio base station 301 to the radio base station 303 are connected to the control station 401 via the I ′ line, respectively.

  The radio base station 301 to the radio base station 303 communicate with each radio terminal station (not shown) by the TDMA / TDD method.

  FIG. 7 is a functional block diagram showing a configuration of a radio base station in the radio base station system according to the present embodiment.

  Referring to FIG. 2, this radio base station is configured not to include collection unit 12 and operation determination unit 13 with respect to the radio base station in the radio base station system according to the first embodiment shown in FIG. It is.

  FIG. 8 is a functional block diagram showing a configuration of control station 401 in the radio base station system according to the present embodiment.

  With reference to the figure, the control station 401 includes a line control unit 21, a central control unit 22, a collection unit 23, and an operation determination unit 24.

  Other configurations and basic operations are the same as those of the radio base station system according to the first embodiment.

  Next, an operation when the radio base station performs operation determination in the radio base station system according to the present embodiment will be described with reference to the drawings.

[Operation]
FIG. 9 is a flowchart defining the operation procedure of the radio base station system according to the present embodiment. A central control unit 5, a line control unit 6, an interface unit 7, a traffic measurement unit 10, a radio signal processing unit 101, a line control unit 21 in the control station 401 in the radio base station 201 to the radio base station 203, The central control unit 22, the collection unit 23, and the operation determination unit 24 read and execute a program including each step of the flowchart from a memory (not shown). This program can be installed externally.

  When activated, the radio base station system according to the present embodiment starts measuring and collecting the traffic amount of each radio base station in each operation mode in which each radio base station is operated as a master base station.

  First, the central control unit 22 in the control station 401 outputs to the line control unit 21 operation information representing an operation mode that is a joint operation and uses one radio base station as a master base station in this radio base station system. That is, operation information representing an operation mode in which communication with a radio terminal station is performed with a 1C3T frame configuration is output to a radio base station serving as a master base station, and a 4T frame is transmitted to a radio base station serving as a slave base station. Operation information representing the operation mode for communicating with the wireless terminal station with the configuration is output to the line control unit 21 (S101).

  The line control unit 21 performs communication protocol processing with the I ′ line and outputs the operation information received from the central control unit 22 to each radio base station via the I ′ line (S101).

  The central control unit 5 in each radio base station represents an operation mode in which operation information from the control station 401 is received via the line control unit 6 and communication with the radio terminal station is performed with a 1C3T frame configuration or a 4T frame configuration. The operation information is output to the communication slot processing unit 14 and the control slot processing unit 15 by a control signal (not shown) (S111).

  Communication slot processing unit 14 and control slot processing unit 15 communicate with the wireless terminal station in a frame configuration represented by a control signal (not shown) received from central control unit 5 (S111).

  Based on the resource release information received from the communication slot processing unit 14 and the resource request information received from the control slot processing unit 15, the traffic measurement unit 10 in each radio base station measures the traffic amount of this radio base station. . Then, the traffic measurement unit 10 outputs the measured traffic volume to the central control unit 5 (S112).

  The central control unit 5 in each radio base station outputs the traffic amount received from the traffic measurement unit 10 to the line control unit 6 (S113).

  The line control unit 6 performs communication protocol processing with the I ′ line, and outputs the amount of traffic received from the central control unit 5 to the control station 401 via the I ′ line (S113).

  The line control unit 21 in the control station 401 performs communication protocol processing with the I ′ line, and outputs the amount of traffic received from each radio base station to the central control unit 22 (S102).

  The central control unit 22 outputs the traffic amount received from the line control unit 21 to the collection unit 23 (S102).

  The collection unit 23 collects the traffic volume of each radio base station received from the central control unit 22 and outputs the collected traffic volume of each radio base station to the operation determination unit 24 (S102).

  When there is an operation mode in which measurement and collection of the traffic amount of each radio base station is not completed (NO in S103), the central control unit 22 is one radio base station that is not yet a master base station. Is output to the line control unit 21 (S104).

  The line control unit 21 performs communication protocol processing with the I ′ line and outputs the operation information received from the central control unit 22 to each radio base station via the I ′ line (S104).

  The operation determination unit 24 completes the measurement and collection of the traffic amount of each radio base station for all operation modes, that is, each radio base station in each operation mode in which each radio base station is operated as a master base station. Is received from the collection unit 23 (YES in S103), it is selected based on the traffic amount of each radio base station received from the collection unit 23 whether to perform joint operation or single operation. (S105 to S107 and S109).

  More specifically, the operation determination unit 24 totals the traffic amount of each radio base station received from the collection unit 23 for each operation mode (S105). Then, when at least one of the traffic amounts tabulated for each operation mode is equal to or greater than a predetermined threshold (YES in S106), the operation determination unit 24 selects joint operation (S107). Further, the operation determining unit 24 selects the single operation (S109) when none of the traffic amounts totaled for each operation mode is equal to or greater than the predetermined threshold (NO in S106).

  Then, when performing joint operation, the operation determination unit 24 determines whether to operate each radio base station as a master base station or a slave base station based on the traffic volume of each radio base station. More specifically, when performing joint operation, the operation determination unit 24 selects an operation mode that maximizes the aggregated traffic volume (S108).

  The operation determination unit 24 outputs operation information representing the operation mode of each radio base station to the central control unit 22 (S110).

  The central control unit 22 outputs the operation information received from the operation determination unit 24 to the line control unit 21 (S110).

  The line control unit 21 performs communication protocol processing with the I ′ line and outputs the operation information received from the central control unit 22 to each radio base station via the I ′ line (S110).

  The central control unit 5 in each radio base station represents an operation mode in which operation information from the control station 401 is received via the line control unit 6 and communication with the radio terminal station is performed with a 1C3T frame configuration or a 4T frame configuration. The operation information is output to the communication slot processing unit 14 and the control slot processing unit 15 by a control signal (not shown) (S114).

  Communication slot processing unit 14 and control slot processing unit 15 communicate with the wireless terminal station in a frame configuration represented by a control signal (not shown) received from central control unit 5 (S114).

  Therefore, in the radio base station system according to the present embodiment, as in the radio base station system according to the first embodiment, the operation mode of the radio base station system is determined based on the traffic amount of the entire radio base station system. By doing so, it is possible to appropriately select the operation mode of the radio base station system.

  Further, in the radio base station system according to the present embodiment, as in the radio base station system according to the first embodiment, the operation of the radio base station system is based on the traffic volume of the entire radio base station system in joint operation. By determining the form, the operation form of the radio base station system can be switched more appropriately.

<Fourth embodiment>
[Constitution]
The configuration of the radio base station system according to the fourth embodiment is the same as the configuration of the radio base station system according to the third embodiment shown in FIG.

  FIG. 10 is a functional block diagram showing a configuration of a radio base station in the radio base station system according to the present embodiment.

  Referring to the figure, the radio base station is configured not to include collection unit 12 and operation determination unit 13 with respect to the radio base station in the radio base station system according to the second embodiment shown in FIG. It is.

  The configuration of the control station in the radio base station system according to the present embodiment is the same as that of control station 401 in the radio base station system according to the embodiment shown in FIG.

  Other configurations and basic operations are the same as those of the radio base station system according to the second embodiment.

  Next, an operation when the radio base station performs operation determination in the radio base station system according to the present embodiment will be described with reference to the drawings.

[Operation]
FIG. 11 is a flowchart defining the operation procedure of the radio base station system according to the present embodiment. Step S121, step S130, step S131, and step S134 are the same as step S101, step S110, step S111, and step S114 in the flowchart shown in FIG.

  Central control unit 5, line control unit 6, interface unit 7, traffic measurement unit 10, communication quality measurement unit 11, radio signal processing unit 101, and control station 401 in radio base station 201 to radio base station 203. The line control unit 21, the central control unit 22, the collection unit 23, and the operation determination unit 24 read and execute a program including each step of the flowchart from a memory (not shown). This program can be installed externally.

  When activated, the radio base station system according to the present embodiment measures and collects the traffic volume and the number of interference avoidance processes of each radio base station in each operation mode in which each radio base station is operated as a master base station. To start.

  Based on the resource release information received from the communication slot processing unit 14 and the resource request information received from the control slot processing unit 15, the traffic measurement unit 10 in each radio base station measures the traffic amount of this radio base station. . Then, the traffic measurement unit 10 outputs the measured traffic volume to the central control unit 5 (S132).

  In response to the interference avoidance command from the interference avoidance control unit 16, the communication quality measurement unit 11 in each radio base station measures and measures the number of times the communication slot processing unit 14 has performed interference avoidance processing in a predetermined period. The number of interference avoidance processes is output to the central controller 5 (S132).

  The central control unit 5 in each radio base station outputs the traffic volume received from the traffic measurement unit 10 and the number of interference avoidance processes received from the communication quality measurement unit 11 to the line control unit 6 (S133).

  The line control unit 6 performs communication protocol processing with the I ′ line, and sends the traffic volume received from the central control unit 5 and the number of interference avoidance processes received from the communication quality measuring unit 11 to the control station 401 via the I ′ line. It outputs (S133).

  The line control unit 21 in the control station 401 performs communication protocol processing with the I ′ line, and outputs the traffic amount received from each radio base station and the number of interference avoidance processes to the central control unit 22 (S122).

  The central control unit 22 outputs the traffic volume and the number of interference avoidance processes received from the line control unit 21 to the collection unit 23 (S122).

  The collection unit 23 collects the traffic amount and interference avoidance processing number of each radio base station received from the central control unit 22, and outputs the collected traffic amount and interference avoidance processing number of each radio base station to the operation determination unit 24. (S122).

  When there is an operation mode in which measurement and collection of the traffic volume and the number of interference avoidance processes of each radio base station are not completed (NO in S123), the central control unit 22 is not yet a master base station. Operation information representing an operation mode in which one radio base station is the master base station is output to the line control unit 21 (S124).

  The line control unit 21 performs communication protocol processing with the I ′ line and outputs the operation information received from the central control unit 22 to each radio base station via the I ′ line (S124).

  The operation determination unit 24 completes the measurement and collection of the traffic volume and the number of interference avoidance processes of each radio base station for all operation modes, that is, each operation mode in which each radio base station is operated as a master base station. When all the traffic volume and the number of interference avoidance processes in each radio base station are received from the collection unit 23 (YES in S123), the joint operation is performed based on the traffic volume of each radio base station received from the collection unit 23. It is selected whether to perform single operation or not (S125 to S127 and S129).

  More specifically, the operation determination unit 24 totals the traffic amount and the number of interference avoidance processes of each radio base station received from the collection unit 23 for each operation mode (S125). Then, the operation determining unit 24 selects the joint operation when at least one of the traffic amounts collected for each operation mode is equal to or greater than a predetermined threshold (YES in S126) (S127). In addition, the operation determining unit 24 selects the single operation (S129) when none of the traffic amounts aggregated for each operation mode is equal to or greater than the predetermined threshold (NO in S126).

  Then, when performing joint operation, the operation determination unit 24 determines whether to operate each radio base station as a master base station or a slave base station based on the number of interference avoidance processes of each radio base station. To do. More specifically, when performing joint operation, the operation determination unit 24 selects an operation mode that minimizes the total number of interference avoidance processes (S128).

  Therefore, in the radio base station system according to the present embodiment, as in the radio base station system according to the second embodiment, the operation of the radio base station system is based on the traffic amount and communication quality of the entire radio base station system. By determining the form, it is possible to appropriately select the operation form of the radio base station system.

  Further, in the radio base station system according to the present embodiment, as in the radio base station system according to the first embodiment, the operation of the radio base station system is based on the traffic volume of the entire radio base station system in joint operation. By determining the form, the operation form of the radio base station system can be switched more appropriately.

[Modification]
The present invention is not limited to the above embodiment, and includes, for example, the following modifications.

(1) Configuration of each radio base station In the radio base station system according to the embodiment of the present invention, all radio base stations are provided with a collection unit 12 and an operation determination unit 13, and a system supplier, a system administrator, or the like Although the configuration is such that one radio base station among the radio base stations determines the operation mode of the radio base station system by setting the radio base station, the present invention is not limited to this. At least one radio base station in the radio base station system includes a collection unit 12 and an operation determination unit 13, and this radio base station collects the traffic volume and the number of interference avoidance processes of each radio base station to operate the radio base station system. It can be set as the structure which performs the operation | use determination which determines a form.

(2) Radio Base Station that Performs Operation Determination In the radio base station system according to the embodiment of the present invention, one radio base station among the radio base stations performs operation determination that determines the operation mode of the radio base station system. Although configured, the present invention is not limited to this. Each radio base station in the radio base station system can be configured to perform operation determination.

  That is, the collection unit 12 in each radio base station collects the traffic amount and the number of interference avoidance processes in its own radio base station and other radio base stations. Then, the operation determination unit 13 in each radio base station is configured to determine the operation mode of its own radio base station based on the traffic amount and interference avoidance processing number of each radio base station received from the collection unit 12. be able to.

(3) Communication quality and traffic volume In the radio base station system according to the embodiment of the present invention, a configuration for appropriately selecting the operation mode of the radio base station system based on the communication quality and traffic volume of the entire radio base station system; However, it is not limited to the communication quality and the traffic volume, but may be anything as long as it represents the communication state of the entire radio base station system.

  That is, the communication quality measurement unit 11 in the radio base station system according to the embodiment of the present invention measures the number of times that the communication slot processing unit 14 has performed interference avoidance processing in a predetermined period, and the operation determination unit 13 Although it is configured to determine whether to operate each radio base station as a master base station or a slave base station based on the number of interference avoidance processes of each radio base station, the present invention is not limited to this. In addition to the number of interference avoidance processes, the communication slot processing unit 14 detects the communication state of the radio base station, for example, the number of communication interruptions with each radio terminal station, and the operation determination unit 13 Based on the number of communication interruptions, it can be configured to determine whether to operate each radio base station as a master base station or a slave base station.

  Further, the communication quality measuring unit 11 receives the radio signal from the receiving unit 3 and measures the received power of the interference wave included in the radio signal, and the operation determining unit 13 is based on the received power of the interference wave of each radio base station. Thus, it can be configured to determine whether each radio base station is operated as a master base station or a slave base station.

(4) Master Base Station and Slave Base Station Operation Judgment Criteria The operation determination unit 13 in the radio base station system according to the embodiment of the present invention is based on the traffic amount of each radio base station or the number of interference avoidance processes. Although it is configured to determine whether each radio base station is operated as a master base station or a slave base station, the configuration is not limited to this. The operation determining unit 13 may be configured to determine whether to operate each radio base station as a master base station or as a slave base station based on the traffic volume and the number of interference avoidance processes of each radio base station. it can.

  A value obtained by totaling the traffic amount of each radio base station in the operation mode with the operation determination unit 13 is T, and a value obtained by totaling the number of interference avoidance processes of each radio base station in the operation mode with the operation determination unit 13 is Q If α and β are real numbers greater than or equal to 0, P representing the superiority of a certain operation mode of the radio base station system is expressed by the following equation.

P = α × T + β / Q (A1)
When performing joint operation, the operation determination unit 13 selects an operation mode in which P is the maximum among the operation modes. This is because the operation mode with a larger amount of traffic allows the common control channel to be used with more radio terminal stations, so the communication capability of the entire radio base station system is higher, and the operation mode with fewer interference avoidance processes. This is because the communication quality of the master base station is so good that the deterioration of the communication capability and the communication quality of the slave base station due to the deterioration of the communication quality of the master base station is small.

(5) Communication System of Radio Base Station System The radio base station system according to the embodiment of the present invention is configured to perform communication using the TDMA / TDD system, but is not limited thereto. In addition to the TDMA / TDD system, a master base station and a slave base station are connected, and the slave base station can control the master base station without using a control channel necessary for communication with the wireless terminal station. As long as it is possible to communicate with a wireless terminal station based on this, a wireless base station system employing any communication method may be used.

(6) Interference avoidance control unit The interference avoidance control unit 16 in the radio base station system according to the embodiment of the present invention compares the error detection rate with a predetermined threshold, and the error detection rate is equal to or higher than the predetermined threshold. However, the present invention is not limited to this, although an interference avoidance command is output to the communication slot processing unit 14 and the call quality measurement unit 11. Not only the error detection rate, but any data representing the communication quality with the wireless terminal station may be used.

  For example, the communication quality measurement unit 11 receives a radio signal from the reception unit 3, measures the received power of the interference wave included in the radio signal, and transmits the interference wave for each communication slot corresponding to the radio terminal station that is the communication partner. The number of communication slots where the received power is equal to or greater than a predetermined threshold is measured. Then, the interference avoidance control unit 16 compares the number of communication slots in which the received power of the interference wave is equal to or greater than a predetermined threshold with the predetermined threshold, and if the number of communication slots is equal to or greater than the predetermined threshold, the interference avoidance control unit 16 The avoidance command may be output to the communication slot processing unit 14 and the call quality measurement unit 11.

(7) Activation conditions for operation determination In the radio base station system according to the embodiment of the present invention, when the radio base station system is activated, each radio base station is operated as a master base station in each operation mode. Although measurement and collection of the traffic amount and interference avoidance processing number of each radio base station is started and operation determination is performed to determine the operation mode of the radio base station system, the configuration is not limited to this.

  Not only when the radio base station system is activated, but also when a new radio base station is added to the radio base station system and every predetermined period after the radio base station system is activated, the operation determination can be performed.

(8) Configuration of Radio Base Station System In the radio base station system according to the embodiment of the present invention, each radio base station is connected in cascade, but the present invention is not limited to this. The master base station and the slave base station are connected, and the master base station that uses the common control channel and the slave base station that communicates with the wireless terminal station based on the control of the master base station without using the common control channel are configured. Any connection form capable of joint operation is possible.

  For example, one radio base station can be connected to a plurality of other radio base stations. Each wireless base station system may be connected by either wire or wireless.

(9) Configuration of Radio Base Station System In the radio base station system according to the embodiment of the present invention, the traffic volume is a joint operation, in which the radio base station system has one radio base station as a master base station. Although the configuration is such that the number of interference avoidance processes is measured and collected, the present invention is not limited to this. Measurement and collection of the traffic volume and the number of interference avoidance processes is performed and collected in each operation mode in which one or a plurality of radio base stations are master base stations in the radio base station system, and an operation determination for determining the operation mode of the radio base station system is performed. It can be configured.

  In addition, the configuration is not limited to the measurement and collection of the traffic volume and the number of interference avoidance processes in all operation modes of the radio base station system in joint operation, but the traffic volume and interference in a plurality of operation modes of the radio base station system in joint operation. The configuration can be such that the number of avoidance processes is measured and collected, and the optimum operation mode is selected from the plurality of operation modes.

(10) Frame configuration In the radio base station system according to the embodiment of the present invention, the frame configuration is composed of a common control channel slot, a speech channel, and a dedicated control channel slot. However, the present invention is not limited to this. . For example, there is no distinction between a common control channel and an individual control channel, and it consists of a slot for a control channel including all control information necessary for communication with a radio terminal station and a slot for a call channel including communication contents with the radio terminal station Even in the frame configuration, any wireless communication system may be used as long as the slave base station can operate based on the control of the master base station without using the control channel.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a block diagram of the radio base station system which concerns on 1st Embodiment. It is a functional block diagram which shows the structure of the wireless base station in the wireless base station system which concerns on 1st Embodiment. It is the flowchart which defined the operation | movement procedure of the radio base station system which concerns on 1st Embodiment. It is a functional block diagram which shows the structure of the wireless base station in the wireless base station system which concerns on 2nd Embodiment. It is the flowchart which defined the operation | movement procedure of the radio base station system which concerns on 2nd Embodiment. It is a block diagram of the radio base station system which concerns on 3rd Embodiment. It is a functional block diagram which shows the structure of the wireless base station in the wireless base station system which concerns on 3rd Embodiment. It is a functional block diagram which shows the structure of the control station in the radio base station system which concerns on 3rd Embodiment. It is the flowchart which defined the operation | movement procedure of the radio base station system which concerns on 3rd Embodiment. It is a functional block diagram which shows the structure of the wireless base station in the wireless base station system which concerns on 4th Embodiment. It is the flowchart which defined the operation | movement procedure of the radio base station system which concerns on 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Antenna, 2 switch, 3 receiving part, 4 demodulating part, 5,22 central control part, 6,21 line control part, 7 interface part, 8 modulation part, 9 transmission part, 10 traffic measurement part, 11 communication quality measurement part , 12, 23 Collection unit, 13 Operation determination unit, 14 Communication slot processing unit, 15 Control slot processing unit, 16 Interference avoidance control unit, 24 Operation determination unit, 101 Radio signal processing unit, 102 Communication state detection unit, 201 ˜203, 301˜303 Radio base station, 401 Control station.

Claims (18)

The radio base station comprising a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and using the control channel when all the radio base stations are connected Radio capable of joint operation comprising a master base station that is a station and a slave base station that communicates with the wireless terminal station using the communication channel based on the control of the master base station without using the control channel A base station system,
Each radio base station is
A communication state detection unit for detecting a communication state of the radio base station;
A central control unit that performs control to change a breakdown of the number of control channels and the number of communication channels used by the radio base station,
At least one of the radio base stations further includes:
A collection unit that collects the detected communication state at each of the radio base stations performing the joint operation;
An operation determination unit that determines an operation mode of the radio base station system that is a combination of the breakdowns of the radio base stations based on the communication state collected by the collection unit;
An operation information output unit that outputs operation information representing the determined operation mode of the radio base station system to each radio base station;
The central control unit is a radio base station system that performs control to change the breakdown based on the operation information. In the joint operation, the radio base station system is configured by one master base station and one or a plurality of slave base stations,
The communication state detection unit measures the amount of traffic in each operation mode of the radio base station system in which each radio base station is the master base station in the joint operation,
The collection unit collects the traffic amount of each radio base station in each operation mode,
The wireless operation according to claim 1, wherein the operation determination unit aggregates the traffic volume collected by the collection unit for each operation mode, and determines whether or not to perform the joint operation based on each aggregated traffic amount. Base station system.   The operation determination unit aggregates the traffic amount of each radio base station collected by the collection unit for each operation mode, and when at least one of the aggregated traffic amounts becomes a predetermined threshold or more The radio base station system according to claim 2, wherein it is determined to perform the joint operation. In the joint operation, the radio base station system is configured by one master base station and one or a plurality of slave base stations,
The communication state detection unit measures the amount of traffic in each operation mode of the radio base station system in which each radio base station is the master base station in the joint operation,
The collection unit collects the traffic amount of each radio base station in each operation mode,
2. The radio base station according to claim 1, wherein the operation determination unit aggregates the traffic amount collected by the collection unit for each operation mode, and selects one of the operation modes based on the aggregated traffic amount. system.   The radio base station system according to claim 4, wherein the operation determination unit aggregates the traffic volume collected by the collection unit for each operation mode, and selects the operation mode in which the total traffic amount is maximized. In the joint operation, the radio base station system is configured by one master base station and one or a plurality of slave base stations,
The communication state detection unit measures the communication quality in each operation mode of the radio base station system in which each radio base station is the master base station in the joint operation,
The collection unit collects the communication quality of each radio base station in each operation mode,
The radio base station according to claim 1, wherein the operation determination unit totals the communication quality collected by the collection unit for each operation mode, and selects any of the operation modes based on the total communication quality. system. Each radio base station further includes an interference avoidance control unit for performing interference avoidance control for changing a timing for communicating with the radio terminal station or a frequency for communicating with the radio terminal station according to communication quality with the radio terminal station. Prepared,
The communication state detection unit measures the number of times that the interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station becomes the master base station,
The collection unit collects the number of times of interference avoidance control of each radio base station in each operation mode,
The said operation determination part totals the frequency | count of the said interference avoidance control collected by the said collection part for every said operation mode, The said operation mode which minimizes the frequency | count of the totaled interference avoidance control is selected. Wireless base station system. The radio base station comprising a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and using the control channel when all the radio base stations are connected Radio capable of joint operation comprising a master base station that is a station and a slave base station that communicates with the wireless terminal station using the communication channel based on the control of the master base station without using the control channel An operation switching method in a base station system,
Each wireless base station detects a communication state of the wireless base station, a communication state detection step,
A collecting step in which a determination base station, which is at least one radio base station among the radio base stations, collects the detected communication state in each radio base station performing the joint operation;
Operation of the radio base station system in which the determination base station is a combination of the number of control channels and the number of call channels used by each radio base station based on the communication state collected in the collecting step An operation determination step for determining the form;
The determination base station outputs operation information representing the determined operation mode of the radio base station system to each radio base station, operation information output step,
A central control step in which each of the radio base stations performs control to change the breakdown based on the operation information. The radio base station comprising a plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel, and using the control channel when all the radio base stations are connected Radio capable of joint operation comprising a master base station that is a station and a slave base station that communicates with the wireless terminal station using the communication channel based on the control of the master base station without using the control channel An operation switching program in a base station system,
Each wireless base station detects a communication state of the wireless base station, a communication state detection step,
A collecting step in which a determination base station, which is at least one radio base station among the radio base stations, collects the detected communication state in each radio base station performing the joint operation;
Operation of the radio base station system in which the determination base station is a combination of the number of control channels and the number of call channels used by each radio base station based on the communication state collected in the collecting step An operation determination step for determining the form;
The determination base station outputs operation information representing the determined operation mode of the radio base station system to each radio base station, operation information output step,
An operation switching program for causing each radio base station to execute a central control step for performing control to change the breakdown based on the operation information. A plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel; and a single control station that controls each of the radio base stations. A master base station, which is the radio base station that uses the control channel when a radio base station is connected, and the communication channel based on the control of the master base station without using the control channel. A radio base station system that can be jointly configured with slave base stations that communicate with radio terminal stations,
Each radio base station is
A communication state detection unit for detecting a communication state of the radio base station;
A central control unit that performs control to change a breakdown of the number of control channels and the number of communication channels used by the radio base station,
The control station
A collection unit that collects the detected communication state at each of the radio base stations performing the joint operation;
An operation determination unit that determines an operation mode of the radio base station system that is a combination of the breakdowns of the radio base stations based on the communication state collected by the collection unit;
An operation information output unit that outputs operation information representing the determined operation mode of the radio base station system to each radio base station;
The central control unit is a radio base station system that performs control to change the breakdown based on the operation information. In the joint operation, the radio base station system is configured by one master base station, one or a plurality of slave base stations, and the one control station,
The communication state detection unit measures the amount of traffic in each operation mode of the radio base station system in which each radio base station is the master base station in the joint operation,
The collection unit collects the traffic amount of each radio base station in each operation mode,
The wireless operation according to claim 10, wherein the operation determination unit aggregates the traffic volume collected by the collection unit for each operation mode, and determines whether or not to perform the joint operation based on each aggregated traffic amount. Base station system.   The operation determination unit aggregates the traffic amount of each radio base station collected by the collection unit for each operation mode, and when at least one of the aggregated traffic amounts becomes a predetermined threshold or more The radio base station system according to claim 11, wherein it is determined to perform the joint operation. In the joint operation, the radio base station system is configured by one master base station, one or a plurality of slave base stations, and the one control station,
The communication state detection unit measures the amount of traffic in each operation mode of the radio base station system in which each radio base station is the master base station in the joint operation,
The collection unit collects the traffic amount of each radio base station in each operation mode,
The radio base station according to claim 10, wherein the operation determination unit totals the traffic volume collected by the collection unit for each operation mode, and selects one of the operation modes based on the total traffic amount. system.   The radio base station system according to claim 13, wherein the operation determination unit totals the traffic volume collected by the collection unit for each operation mode, and selects the operation mode that maximizes the total traffic volume. In the joint operation, the radio base station system is configured by one master base station, one or a plurality of slave base stations, and the one control station,
The communication state detection unit measures the communication quality in each operation mode of the radio base station system in which each radio base station is the master base station in the joint operation,
The collection unit collects the communication quality of each radio base station in each operation mode,
The radio base station according to claim 10, wherein the operation determination unit totals the communication quality collected by the collection unit for each operation mode, and selects one of the operation modes based on the total communication quality. system. Each radio base station further includes an interference avoidance control unit for performing interference avoidance control for changing a timing for communicating with the radio terminal station or a frequency for communicating with the radio terminal station according to communication quality with the radio terminal station. Prepared,
The communication state detection unit measures the number of times that the interference avoidance control is performed in a predetermined period in each operation mode of the radio base station system in which each radio base station becomes the master base station,
The collection unit collects the number of times of interference avoidance control of each radio base station in each operation mode,
The said operation determination part totals the frequency | count of the said interference avoidance control collected by the said collection part for every said operation form, The said operation form which minimizes the frequency | count of the said interference avoidance control totaled is selected. Wireless base station system. A plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel; and a single control station that controls each of the radio base stations. A master base station, which is the radio base station that uses the control channel when a radio base station is connected, and the communication channel based on the control of the master base station without using the control channel. An operation switching method in a radio base station system capable of joint operation configured by a slave base station communicating with a radio terminal station,
Each wireless base station detects a communication state of the wireless base station, a communication state detection step,
A collecting step in which the control station collects the detected communication state at each of the radio base stations performing the joint operation;
Operation mode of the radio base station system, in which the control station is a combination of a breakdown of the number of control channels and the number of call channels used by each radio base station based on the communication state collected in the collecting step An operation determination step for determining
The operation information output step of outputting operation information representing the determined operation mode of the radio base station system to each radio base station by the control station,
A central control step in which each of the radio base stations performs control to change the breakdown based on the operation information. A plurality of radio base stations that communicate with one or a plurality of radio terminal stations using a control channel and a communication channel; and a single control station that controls each of the radio base stations. A master base station, which is the radio base station that uses the control channel when a radio base station is connected, and the communication channel based on the control of the master base station without using the control channel. An operation switching program in a radio base station system capable of joint operation configured with slave base stations communicating with a radio terminal station,
Each wireless base station detects a communication state of the wireless base station, a communication state detection step,
A collecting step in which the control station collects the detected communication state at each of the radio base stations performing the joint operation;
Operation mode of the radio base station system, in which the control station is a combination of a breakdown of the number of control channels and the number of call channels used by each radio base station based on the communication state collected in the collecting step An operation determination step for determining
The operation information output step of outputting operation information representing the determined operation mode of the radio base station system to each radio base station by the control station,
An operation switching program for causing each radio base station to execute a central control step for performing control to change the breakdown based on the operation information.

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