JP2005204254A - Radio base station. radio terminal station, and radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce power consumption, and to quickly perform radio communication regardless of the operating condition of a radio terminal station. <P>SOLUTION: This radio base station 1 has an antenna 11, a processing portion 12, and a user interface portion 13. The processing portion 12 has a data transmission/reception portion 14 for controlling radio communication, a radio terminal station management portion 15 for registering connection information of radio terminal stations 2 which perform radio communication, and a network state management portion 16 for managing the state of a radio communication network. Since the transmitting time interval of synchronizing signals is changed according to the state of the network, it becomes possible to perform adaptable transmission of the synchronizing signals according to the state of the network. In addition, by maintaining connection with a radio terminal station 2 after communication with the terminal station 2 finishes also, it becomes possible to omit such processing as registration into the radio communication network etc., and perform data transmission and reception, when communication with the terminal station 2 is started next. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a radio base station that performs radio communication with a radio terminal station using the same frequency channel, a radio terminal station that performs radio communication with the radio base station, and a radio communication method.

Conventionally, a wireless communication system in which a base station and a plurality of terminal stations perform wireless communication using the same frequency channel is known. In this type of conventional wireless communication system, when a plurality of base stations operate in cooperation to reduce the power consumption of the base station (Patent Document 1), or when the power of the terminal station registered in the wireless base station is turned off, A technique (Patent Document 2) for deleting registration information to a radio base station is known.
JP 2003-174456 A JP-A-9-61508

  With the method of Patent Document 1, when only one base station is used, low power consumption cannot be achieved. In addition, even when all the terminal stations registered in the base station are determined to be in a standby state (communication impossible state), the transmission time interval of the synchronization signal transmitted from the base station to the terminal station does not change. It consumes power in vain.

  Furthermore, since the base station discards the registration information of the terminal station that is found to be in the standby state (communication disabled state), the terminal station is in the normal operation state (communication enabled state) from the standby state (communication disabled state). Each time it returns to the network, registration processing to the network is required, and there is a problem that it takes time until application data is transmitted.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a radio base capable of reducing power consumption and performing radio communication promptly regardless of the operating state of the radio terminal station. Is to provide a station. Another object of the present invention is to provide a wireless terminal station and a wireless communication method that can quickly perform wireless communication with a wireless base station.

  In order to solve the above-described problem, the present invention provides a radio base station that performs radio communication with one or more radio terminal stations using the same frequency channel in order to synchronize with the radio terminal station. Synchronization signal transmission control means for variably controlling the transmission time interval of the synchronization signal to be transmitted, and connection information registration means for registering connection information necessary for connection with the wireless terminal station, the connection information registration means, The registered connection information is maintained even after communication with the wireless terminal station is completed.

  In addition, in a wireless terminal station that performs wireless communication with a wireless base station, wireless communication with the wireless base station is performed including transmission time interval information of a synchronization signal transmitted from the wireless base station for synchronization. Connection information registration means for storing connection information necessary for connection, and a synchronization signal stored in the connection information registration means when returning from a power-off or standby state (communication impossible state) to a normal operation state (communication possible state) Communication control means for waiting for reception of the synchronization signal for a period longer than the transmission time interval.

  In the wireless communication method in which wireless communication is performed using the same frequency channel between the wireless base station and one or more wireless terminal stations, the wireless terminal station is synchronized with the wireless base station. The connection information necessary for wireless communication with the wireless base station is stored in the first connection information storage unit, including the transmission time interval of the synchronization signal transmitted to the wireless base station, and the wireless base station Connection information necessary for connection with the wireless terminal station is stored in the second connection information storage unit, and all the wireless terminal stations corresponding to all the connection information stored in the second connection information storage unit communicate with each other. When in the disabled state, the transmission time interval of the synchronization signal is lengthened, and when any of the wireless terminal stations returns to the communicable state, the wireless terminal station stored in the second connection information storage unit Based on the connection information, the wireless terminal Performs wireless communication station Metropolitan.

  According to the present invention, since the transmission time interval of the synchronization signal transmitted to the wireless terminal station is variably controlled, the power consumption of the wireless base station can be reduced, and the wireless base station can be connected between the wireless base station and the wireless terminal station. The time required to start wireless communication can be reduced.

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

(First embodiment)
FIG. 1 is a conceptual diagram of a wireless communication system 3 that performs wireless communication between a wireless base station 1 and a wireless terminal station 2 according to an embodiment of the present invention. As shown in FIG. 1, the radio base station 1 performs radio communication with one or more radio terminal stations 2 using the same frequency channel. Further, direct wireless communication may be performed between the wireless terminal stations 2 without using the wireless base station 1. In FIG. 1, three wireless terminal stations 2 are illustrated, but the number of wireless terminal stations 2 is not particularly limited.

  FIG. 2 is a block diagram showing an example of the internal configuration of the radio base station 1. The radio base station 1 of FIG. 2 includes an antenna 11, a processing unit 12, and a user interface unit 13. The processing unit 12 includes a data transmission / reception unit 14 that controls wireless communication, a wireless terminal station management unit 15 that registers connection information of the wireless terminal station 2 that performs wireless communication, and a network state management unit that manages the state of the wireless communication network 16.

  FIG. 3 is a flowchart showing an example of the synchronization signal transmission time interval changing process performed by the radio base station 1 of FIG. The processing unit 12 determines the start of the network based on the input signal from the user interface unit 13 (step S1). If the start of the network is not requested, it waits for the network start request, and when the start of the network is requested, the processing unit 12 opens the network (step S2).

After the network is established, the processing unit 12 performs data transmission / reception as necessary (step S7), and determines whether or not the network is terminated based on an input signal from the user interface unit 13 (step S3). When the end of the network is determined, the processing unit 12 performs a network end process (step S4).
When continuing the network, the network state management unit 16 determines whether the state of the network has changed based on signals from the data transmission / reception unit 14 and the wireless terminal station management unit 15 (step S5).

  If the network status does not change, the network is continued as it is. When the network state has changed, the network state management unit 16 issues a command for changing the transmission time interval of the synchronization signal to the data transmission / reception unit 14, and changes the transmission time interval of the synchronization signal (step S6).

  FIG. 4 is a flowchart showing an example of connection determination processing performed by the radio base station 1 of FIG. The data transmitter / receiver 14 determines whether data has been received (step S11). If no data is received, the data transmitter / receiver 14 waits for data reception. If data is received, the data transmitter / receiver 14 determines whether the received data is a registration request packet (step S12). If it is not a registration request packet, the data transmitter / receiver 14 inquires of the wireless terminal station management unit 15 to determine whether or not the wireless terminal station 2 that is the data transmission destination is registered in the wireless communication network (step S13). .

  If the wireless terminal station 2 is not registered in the wireless communication network, no subsequent transmission / reception is performed, and the next data reception is awaited. If the wireless terminal station 2 is registered in the wireless communication network, data transmission / reception with the wireless terminal station 2 is performed (step S14).

  If the received data is a registration request packet in step S12, the wireless terminal station management unit 15 is inquired to determine whether or not the wireless terminal station 2 is registered in the wireless communication network (step S15). .

  If the wireless terminal station 2 is registered in the wireless communication network, data transmission / reception is performed with the wireless terminal station 2 (step S16). If not registered, the data transmitting / receiving unit 14 inquires of the network state management unit 16 whether registration is possible or not, and makes a registration determination (steps S17 and S18). If registration of the wireless terminal station 2 is not permitted, the data transmitting / receiving unit 14 transmits registration non-permission data to the wireless terminal station 2 (step S19) and waits for the next data reception.

  If registration of the wireless terminal station 2 is permitted, registration is performed in the wireless terminal station management unit 15 (step S20), and the data transmitting / receiving unit 14 transmits registration permission data to the wireless terminal station 2 (step S21). Data transmission / reception is performed (step S22).

  After the start of transmission / reception, it is determined whether or not the communication is completed (step S23). If it is not determined that the communication is completed, the transmission and reception of data is continued. If it is determined that the communication is terminated, the process is terminated while maintaining the connection with the wireless terminal station 2 (step S24).

  As described above, since the radio base station 1 according to the first embodiment changes the transmission time interval of the synchronization signal according to the network state, the adaptive synchronization signal can be transmitted according to the network state. . Further, even after the communication with the wireless terminal station 2 is completed, the connection with the wireless terminal station 2 is maintained, so that the next time communication with the wireless terminal station 2 is started, registration to the wireless communication network, etc. This process can be omitted and data can be sent and received quickly.

(Second Embodiment)
In the second embodiment, the transmission time interval of the synchronization signal is changed according to the operating state of the wireless terminal station 2.

  FIG. 5 is a block diagram showing an internal configuration of the radio base station 1 according to the second embodiment. The wireless base station 1 in FIG. 5 includes a wireless terminal station operation state management unit 17 that manages the operation state of the wireless terminal station 2 instead of the network state management unit 16 in FIG.

  FIG. 6 is a flowchart showing an example of the synchronization signal transmission time interval changing process performed by the radio base station 1 of FIG. The processing unit 12 determines the start of the network based on the input signal from the user interface unit 13 (step S31). If the start of the network is not requested, it waits for the network start request, and when the start of the network is requested, the processing unit 12 opens the network (step S32).

  After the establishment of the network, the processing unit 12 performs data transmission / reception as necessary (step S37), and determines whether or not the network is terminated based on an input signal from the user interface unit 13 (step S33). When the end of the network is determined, the processing unit 12 performs a network end process (step S34).

  When the network is continued, the wireless terminal station operation state management unit 17 determines the wireless terminal station 2 registered in the wireless base station 1 based on signals from the data transmission / reception unit 14 and the wireless terminal station management unit 15. It is determined whether the operating state has changed (step S35).

  If the operating state of the wireless terminal station 2 does not change, the network is continued as it is. When the operation state of the wireless terminal station 2 changes, the wireless terminal station operation state management unit 17 issues a command to change the transmission time interval of the synchronization signal to the data transmission / reception unit 14, and sets the transmission time interval of the synchronization signal. Change (step S36).

  As described above, in the second embodiment, since the transmission time interval of the synchronization signal is changed according to the operation state of the wireless terminal station 2 registered in the wireless base station 1, the normal operation state (communication enabled state) It is possible to transmit an adaptive synchronization signal in accordance with the number of wireless terminal stations 2 in the network.

(Third embodiment)
In the third embodiment, the transmission time interval of the synchronization signal is changed depending on whether or not the wireless terminal station 2 is in a standby state (communication disabled state).

  The internal configuration of the radio base station 1 according to the third embodiment is the same as that shown in FIG.

  FIG. 7 is a flowchart illustrating an example of a change process of the synchronization signal transmission time interval performed by the radio base station 1 according to the third embodiment. The processing unit 12 determines the start of the network based on the input signal from the user interface unit 13 (step S41). If the start of the network is not requested, it waits for the network start request. When the start of the network is requested, the processing unit 12 opens the network (step S42).

  After the network is established, the processing unit 12 performs data transmission / reception as necessary (step S49), and determines whether or not the network is terminated by an input signal from the user interface unit 13 (step S43). If the end of the network is determined, the processing unit 12 performs a network end process (step S44).

  When continuing the network, the wireless terminal station operation state management unit 17 determines whether the wireless terminal station 2 registered in the wireless base station 1 is based on signals from the data transmission / reception unit 14 and the wireless terminal station management unit 15. It is determined whether or not it is in a standby state (communication impossible state) (step S45). When the wireless terminal station 2 is in a normal operation state (communication enabled state), the network is continued as it is. In this case, the process of step S43 is performed.

  When the wireless terminal station 2 is in a standby state (communication impossible state) including power-off, the wireless terminal station operation state management unit 17 deletes the registration information of the wireless terminal station 2 in the wireless terminal station management unit 15 Without connecting, the connection with the wireless terminal station 2 is maintained (step S46).

  The wireless terminal station operation state management unit 17 determines whether or not all the wireless terminal stations 2 are in a standby state (communication impossible state) including power-off (step S47), and all the wireless terminal stations 2 If the wireless terminal station 2 is in a standby state (communication disabled state) including power-off, the data transmission / reception unit 14 returns to the original state. A command for changing the synchronization signal transmission time interval is issued to change the synchronization signal transmission time interval (step S48). Note that the standby state (communication impossible state) including power-off refers to a state in which a packet cannot be transmitted and a packet cannot be received.

  As described above, according to the third embodiment, depending on whether all the wireless terminal stations 2 registered in the wireless base station 1 are in a standby state (communication disabled state) including power-off, or not. By changing the transmission time interval of the synchronization signal, it is possible to transmit an adaptive synchronization signal according to the normal operation state (communication enabled state) and the standby state (communication disabled state) including power-off.

(Fourth embodiment)
In the fourth embodiment, the operation state of the wireless terminal station 2 is determined by an operation state management protocol.

  FIG. 8 is a block diagram showing an internal configuration of the radio base station 1 according to the fourth embodiment. The radio base station 1 in FIG. 8 includes an operation state management protocol processing unit 18 that analyzes the contents of the operation state management protocol transmitted by the wireless terminal station 2, instead of the network state management unit 16 in FIG.

  FIG. 9 is a flowchart showing an example of an operation state determination process of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The data transmitter / receiver 14 determines whether data has been received (step S51). If no data is received, the data transmitter / receiver 14 waits for data reception. If data is received, the data transmitter / receiver 14 determines whether the received data is operation state management protocol data (step S52).

  If it is not operation state management protocol data, the wireless terminal station 2 determines that it is in a normal operation state (communication enabled state) (step S53). If it is operation state management protocol data, the data transmitting / receiving unit 14 transmits the received data to the operation state management protocol processing unit 18.

  The operation state management protocol processing unit 18 determines whether or not the received operation state management protocol data is a notification of transition to a standby state (communication disabled state) including power-off (step S54). If it is not a notification of transition to the standby state (communication impossible state) including power-off, it is determined that it is in the normal operation state (communication enabled state) (step S53), and the standby state including power-off (communication disabled state) If it is a notification of transition to, it is determined that it is in a standby state (communication impossible state) including power-off (step S55).

  As described above, in the fourth embodiment, the operation state of the wireless terminal station 2 can be reliably determined by the operation state management protocol.

(Fifth embodiment)
In the fifth embodiment, the operating state of the wireless terminal station 2 is determined based on the number of times a response to the packet transmitted to the wireless terminal station 2 is not returned.

  FIG. 10 is a block diagram showing an internal configuration of the radio base station 1 according to the fifth embodiment. The wireless base station 1 in FIG. 10 includes a communication status management unit 19 that manages the communication status with the wireless terminal station 2 instead of the network status management unit 16 in FIG.

  FIG. 11 is a flowchart showing an example of an operation state determination process of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The data transmitter / receiver 14 transmits / receives data to / from the wireless terminal station 2 (step S61). The data transmitter / receiver 14 determines whether or not a delivery confirmation packet for the transmitted data is received from the wireless terminal station 2 (step S62). When a delivery confirmation packet is received from the wireless terminal station 2, it is determined that the wireless terminal station 2 is in a normal operation state (communication enabled state) (step S63).

  When the delivery confirmation packet is not received from the wireless terminal station 2, it is determined whether or not the number of times of not receiving the delivery confirmation packet for the transmission data exceeds a threshold value (step S64). If the threshold value is exceeded, it is determined that the wireless terminal station 2 is in a standby state (communication impossible state) including power-off (step S65).

  If the threshold number of times is not exceeded, it is determined that the wireless terminal station 2 is in a normal operation state (communication enabled state) (step S67), and data transmission / reception with the wireless terminal station 2 is performed (step S61).

  As described above, in the fifth embodiment, since the operating state of the wireless terminal station 2 is determined based on the number of times a response to the packet transmitted to the wireless terminal station 2 is not returned, the operating state of the wireless terminal is simply and accurately determined. I can judge.

(Sixth embodiment)
In the sixth embodiment, the operating state of the wireless terminal station 2 is determined based on the channel utilization rate of each wireless terminal station 2.

  FIG. 12 is a block diagram showing an internal configuration of the radio base station 1 according to the sixth embodiment. The radio base station 1 in FIG. 12 has a channel usage rate measurement unit 20 that measures the channel usage rate of each radio terminal station 2 instead of the network state management unit 16 in FIG.

  FIG. 13 is a flowchart showing an example of an operation state determination process of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The channel usage rate measuring unit 20 calculates the channel usage rate of each wireless terminal station 2 (step S71). The channel utilization rate of each wireless terminal station 2 is calculated based on the channel utilization time of each wireless terminal station 2, but the channel utilization time of each wireless terminal station 2 is the power above a certain threshold on the channel. Is at least one of the time in which the radio wave indicating the time exists and the reserved time for bandwidth reservation.

  The channel utilization rate measuring unit 20 determines whether or not the channel utilization rate of each wireless terminal station 2 is equal to or less than a threshold value (step S72). It is determined that it is in a standby state (communication disabled state) (step S73). If the channel utilization rate of each wireless terminal station 2 is not less than or equal to the threshold value, it is determined that the wireless terminal station 2 is in a normal operation state (communication enabled state) (step S74).

As described above, in the sixth embodiment, the operating state of the wireless terminal station 2 can be determined based on the channel utilization rate of each wireless terminal station 2.

(Seventh embodiment)
In the seventh embodiment, the operating state of the wireless terminal station 2 is detected based on whether or not wireless communication is performed with the wireless terminal station 2 at a specified time.

  FIG. 14 is a block diagram showing an internal configuration of the radio base station 1 according to the seventh embodiment. The radio base station 1 in FIG. 14 includes a time management unit 21 that manages whether or not a designated time has been reached in addition to the configuration in FIG. 5. The user can set an arbitrary designated time in the time management unit 21 via the user interface unit 13. When the set designated time is reached, the time management unit 21 transmits a signal indicating that to the wireless terminal station operation state management unit 17.

  FIG. 15 is a flowchart showing an example of an operation state determination process of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The time management unit 21 notifies the wireless terminal station operation state management unit 17 that the specified time has been reached when the specified time is reached (step S81). The wireless terminal station operation state management unit 17 inquires of the data transmitting / receiving unit 14 whether data is being transmitted / received to / from the wireless terminal station 2 (step S82). If data transmission / reception has been performed, it is determined that the device is in a normal operation state (communication enabled state) (step S83). If data transmission / reception has not been performed, it is in a standby state (communication disabled state) including power-off. Is determined (step S84).

  FIG. 16 is a flowchart showing a modification of FIG. In FIG. 16, designated time 1 and designated time 2 are set as the designated times of the time management unit 21. The process until the normal operation state (communication possible state) is determined (step S93) is the same as in FIG. 15, but when the designated time 2 is reached (step S94), the power is turned off regardless of whether data is transmitted or received. Is determined to be in a standby state (communication impossible state) including (step S95).

  As described above, in the seventh embodiment, the operating state of the wireless terminal station 2 can be determined based on the time, and the wireless terminal station 2 can be forcibly set by providing several threshold times. Since the standby state (communication disabled state) is determined, it is possible to prevent the user from forgetting to turn off the power switch.

(Eighth embodiment)
In the eighth embodiment, the operating state of the wireless terminal station 2 is determined according to the luminance around the wireless base station 1.

  FIG. 17 is a block diagram showing an internal configuration of the radio base station 1 according to the eighth embodiment. The radio base station 1 of FIG. 17 includes a luminance measurement unit 22 that measures the luminance around the radio base station 1 in addition to the configuration of FIG. The user can set a reference luminance for determining the operation state of the wireless terminal station 2 via the user interface unit 13.

  FIG. 18 is a flowchart showing an example of operation state determination processing of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The luminance measuring unit 22 measures the luminance around the radio base station 1 (step S101), and when the measured luminance is equal to or lower than the threshold value (step S102), the luminance measuring unit 22 transmits the luminance to the radio terminal station operation state management unit 17. Notify that the value is below the threshold.

  The wireless terminal station operation state management unit 17 inquires of the data transmitting / receiving unit 14 whether data is being transmitted / received to / from the wireless terminal station 2 (step S103). If data transmission / reception has been performed, it is determined that the device is in a normal operation state (communication enabled state) (step S104). If data transmission / reception has not been performed, it is in a standby state (communication disabled state) including power-off. (Step S105).

  As described above, in the eighth embodiment, since the operating state of the wireless terminal station 2 is determined based on the luminance, it is possible to reliably detect the user forgetting to turn off the power.

  The functions of the above-described embodiments may be implemented in any combination.

(Ninth embodiment)
In the ninth embodiment, a registered terminal station management table for registering connection information of the wireless terminal station 2 is provided.

  The radio base station 1 according to the ninth embodiment has the same block configuration as that of the first to eighth embodiments described above. FIG. 19 is a diagram illustrating an example of an internal configuration of the wireless terminal station management unit 15 in the wireless base station 1. As illustrated, the wireless terminal station management unit 15 has a registered wireless terminal station management table 15a for registering connection information of the currently connected wireless terminal station 2. In this table, the name (identification information) of the wireless terminal station 2 and connection information are registered. In the example of FIG. 19, three wireless terminal stations 2B, E, and G are registered.

  Even when wireless communication with the wireless terminal station 2 is completed, the wireless terminal station management unit 15 retains the connection information of the wireless terminal station 2 without deleting it from the registered wireless terminal station management table 15a.

  For example, after determining that the communication with the wireless terminal station E registered in the registered terminal station management table of FIG. 19 has ended, the identifier and registration information of the wireless terminal station E are not deleted from the registered terminal station management table. By maintaining the connection, the connection with the wireless terminal station E is maintained.

  As described above, in the ninth embodiment, even when the wireless communication with the wireless terminal station 2 is completed, the connection information of the wireless terminal station 2 is not deleted from the registered terminal station management table. When the wireless communication is resumed, connection processing is not necessary, and wireless communication can be performed quickly.

(Tenth embodiment)
In the tenth embodiment, whether or not to maintain the connection with the wireless terminal station 2 is determined by notifying the installation state of the wireless terminal station 2 in advance.

  The radio base station 1 according to the tenth embodiment has a block configuration similar to that shown in FIG. FIG. 20 is a flowchart showing an example of processing operation of the radio base station 1 according to the tenth embodiment. This flowchart shows the processing operation for determining whether or not to maintain the connection with the wireless terminal station 2.

  The data transmitter / receiver 14 determines whether data is received (step S111). If no data is received, the data transmitter / receiver 14 waits until data is received. When the data is received, the data transmitting / receiving unit 14 determines whether the received data is a registration request packet (step S112). If it is not a registration request packet, the data transmission / reception unit 14 inquires of the wireless terminal station management unit 15 to determine whether or not the wireless terminal station 2 that is the data transmission destination is registered in the wireless communication network (step S113). . If the wireless terminal station 2 is not registered in the wireless communication network, no subsequent transmission / reception is performed, and the system waits until the next data is received. If the wireless terminal station 2 is registered in the wireless communication network, data transmission / reception with the wireless terminal station 2 is performed (step S114).

  In step S112, if the received data is a registration request packet, the wireless terminal station management unit 15 is inquired to determine whether or not the wireless terminal station 2 is registered in the wireless communication network (step S115). If the wireless terminal station 2 is registered in the wireless communication network, the wireless terminal station management unit 15 is inquired to determine whether the installation state information of the wireless terminal station 2 is registered (step S116).

  If the installation state information of the wireless terminal station 2 is registered, data is transmitted to and received from the wireless terminal station 2 (step S117). If not registered, the installation state information of the wireless terminal station 2 is included in the received registration request packet. It is determined whether there is information (step S118). If there is installation information, the installation information is registered in the wireless terminal station manager 15 (step S119). If there is no installation information, transmission / reception is started (step S117).

  If the wireless terminal station 2 is not registered in the wireless communication network in step S115, the data transmission / reception unit 14 inquires of the network state management unit 16 whether registration is possible and makes a registration determination (steps S120 and S121).

  If the registration of the wireless terminal station 2 is not permitted, the data transmitting / receiving unit 14 transmits a registration non-permission packet to the wireless terminal station 2 (step S122), and waits for the next data reception. If registration of the wireless terminal station 2 is permitted, the wireless terminal station 2 is registered in the wireless terminal station management unit 15 (step S123), and it is determined whether or not the received registration request packet includes terminal station installation state information (step S123). S124).

  If there is no installation information, the data transmitter / receiver 14 transmits a registration permission packet to the wireless terminal station 2 (step S125), and if there is installation information, the installation information is registered in the wireless terminal station management unit 15 ( In step S126, a registration permission packet is transmitted to the wireless terminal station 2 (step S125), and then transmission / reception is started (step S117).

  After the start of transmission / reception, it is determined whether or not the communication is completed (step S127). If it is not determined that the communication is completed, the transmission and reception of data is continued. If it is determined that the communication is terminated, it is determined whether the installation state information of the wireless terminal station 2 is registered (step S128). If not registered, the connection with the wireless terminal station 2 is disconnected (step S129). If it is registered, it is determined whether or not the installation state of the wireless terminal station 2 is semi-fixed (step S130). If it is not semi-fixed, the connection with the wireless terminal station 2 is disconnected (step S129). If semi-fixed, the process is terminated while maintaining the connection with the wireless terminal station 2 (step 131).

  In the above description, an example in which the installation status notification of the wireless terminal station 2 is performed using the registration request packet is shown. However, the installation status notification is not necessarily performed by the registration request packet, and the installation status information is not necessarily obtained by other means. May be notified. For example, the notification of the installation state of the wireless terminal station 2 can be performed by a unique protocol using a reserve bit of a packet or the like.

  Further, the notification of the installation state can also be notified using a packet as described above, but the installation state information of the wireless terminal station 2 that the user registers in the wireless base station 1 by the user interface unit 13 shown in FIG. You may set by inputting.

  Thus, in the tenth embodiment, it is possible to clearly determine whether or not to maintain the connection by notifying the installation state of the wireless terminal station 2 in advance.

(Eleventh embodiment)
In the eleventh embodiment, various kinds of information of the wireless terminal station 2 are registered in the wireless base station 1 in advance.

  The radio base station 1 according to the eleventh embodiment has a block configuration similar to that shown in FIG. FIG. 21 is a diagram showing an example of a registration information table of the wireless terminal station 2 managed by the wireless terminal station management unit 15 in the wireless base station 1.

  The registration information table in FIG. 21 registers identification information, performance information, a data transmission method, and a transmission data type of the wireless terminal station 2. In more detail, QoS (Qaulity of Service) support as performance information, Power Save support, Spectrum support and Block Ack support are transmitted, and burst transmission and direct communication between wireless terminal stations 2 are transmitted as data transmission methods. An example is shown in which traffic IDs 0 to ID3 are held as data types.

  FIG. 22 is a flowchart showing an example of a processing procedure until the wireless base station 1 and the wireless terminal station 2 transmit and receive data.

  Before the wireless base station 1 and the wireless terminal station 2 transmit and receive data, a registration request process (step S141), a direct communication setting process (step S142), a transmission data type setting process (step S143), and a burst transmission setting process ( After step S144) is completed, data transmission / reception (step S145) is performed.

  As shown in FIG. 22, when many setting processes are required before data transmission / reception, such setting process is performed every time a transition is made to a normal operation state (communication enabled state) including power-on. Necessary. In order to solve this problem, various settings shown in FIG. 22 are performed when the wireless terminal station 2 is initially turned on, and the wireless base station 1 holds the registration information of the wireless terminal station 2 shown in FIG. When the terminal station 2 returns to the normal operation state (communication enabled state), it is possible to transmit and receive data without the various setting processes shown in FIG.

  Further, the registration information held by the radio base station 1 may be a part of the registration information shown in FIG. 21 or may be more than this.

  As described above, in the eleventh embodiment, not only the identification information of the wireless terminal station 2 but also various setting information are stored as registration information of the wireless terminal station 2 held by the wireless base station 1, so that more settings are made. Data can be transmitted / received without the above process, and data can be transmitted / received without delay after transition to the normal operation state (communication enabled state).

(Twelfth embodiment)
In the twelfth embodiment, the condition for increasing the transmission time interval of the synchronization signal is changed from that in the third embodiment.

  The radio base station 1 according to the twelfth embodiment has the same internal configuration as that of FIG. FIG. 23 is a flowchart illustrating an example of a process for changing the synchronization signal transmission time interval performed by the radio base station 1 according to the twelfth embodiment. The processing unit 12 determines the start of the network based on an input signal from the user interface unit 13 (step S151). If the start of the network is not requested, it waits for the network start request. When the start of the network is requested, the processing unit 12 opens the network (step S152).

  After the network is established, the processing unit 12 performs data transmission / reception as necessary (step S159), and determines whether or not the network is terminated based on an input signal from the user interface unit 13 (step S153). If the end of the network is determined, the processing unit 12 performs a network end process (step S154).

  When the network continues, the wireless terminal station operation state management unit 17 determines the wireless terminal station 2 registered in the wireless base station 1 based on signals from the data transmission / reception unit 14 and the wireless terminal station management unit 15. The operating state is determined (step S155).

  When the wireless terminal station 2 is in a normal operation state (communication enabled state), the network is continued as it is. When the wireless terminal station 2 is in a standby state (communication impossible state) including power-off, the wireless terminal station operation state management unit 17 stores the registration information of the wireless terminal station 2 in the wireless terminal station management unit 15. The connection with the wireless terminal station 2 is maintained without being deleted (step S156). The wireless terminal station operation state management unit 17 determines the operation state of all the wireless terminal stations 2 (step S157), and all the wireless terminal stations 2 must be in a standby state (communication disabled state) including power-off. If the wireless terminal station 2 returns to its original state and all the wireless terminal stations 2 are in a standby state (communication impossible state) including power-off, a command for changing the synchronization signal transmission time interval to a long time is sent to the data transmitting / receiving unit 14. Issued, and the transmission time interval of the synchronization signal is changed to a long time (step S158).

  As described above, in the twelfth embodiment, when all the wireless terminal stations 2 registered in the wireless base station 1 are in a standby state (communication disabled state) including power-off, the transmission time of the synchronization signal Since the interval is changed to be longer, the number of synchronization signal transmissions is reduced, and the power consumption of the radio base station 1 can be reduced.

(13th Embodiment)
In the thirteenth embodiment, the transmission time interval of the synchronization signal transmitted to the wireless terminal station 2 in the standby state (communication disabled state) is increased stepwise.

  FIG. 24 is a diagram illustrating an example in which the transmission time interval of the synchronization signal transmitted by the wireless base station 1 is changed stepwise.

  In FIG. 24, when the wireless base station 1 determines that at least one wireless terminal station 2 is in the normal operation state (communication enabled state), the synchronization signal transmission time interval is set to 100 milliseconds and the synchronization signal is transmitted. Then. That is, at the times t0, t1, and t2 at which the synchronization signal is transmitted, the transmission time interval of the synchronization signal is set to 100 milliseconds. When the wireless base station 1 determines that all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off at time t3, the synchronization signal is transmitted at time t4 when the synchronization signal is transmitted next. Is transmitted with a transmission time interval of 200 milliseconds. Further, at t5, which is the time when the next synchronization signal is transmitted, the synchronization signal transmission time interval is set to 300 milliseconds. Although not shown, the transmission time interval of the synchronization signal is further increased to 400 milliseconds and 500 milliseconds thereafter.

  The above example shows an example in which the transmission time interval of the synchronization signal is increased by 100 milliseconds, but the time increment for increasing the transmission time interval of the synchronization signal is not limited to this.

  As shown in FIG. 24, by increasing the transmission time interval of the synchronization signal stepwise, the number of synchronization signals transmitted by the radio base station 1 is reduced, and further power consumption can be reduced.

  In addition, after it is determined that all the wireless terminal stations 2 registered in the wireless base station 1 are in a standby state (communication impossible state) including power-off, at least one wireless terminal station 2 is in a normal operation state. In the (communicable state), data may be transmitted / received, and data for registration request may be transmitted / received from the new wireless terminal station 2. Therefore, if the synchronization signal transmission interval is abruptly increased, the wireless terminal station 2 has a lower probability of receiving the synchronization signal, cannot detect the presence of the network, and increases the possibility that data cannot be transmitted. If the transmission time interval of the synchronization signal is increased stepwise as in this embodiment, such a problem can be avoided.

  In the above example, after the radio base station 1 determines that all radio terminal stations 2 are in a standby state (communication impossible state) including power-off, the transmission time interval of the synchronization signal is unconditionally increased stepwise. However, a condition may be added to gradually increase the transmission time interval of the synchronization signal.

  FIG. 25 is a flowchart showing an example of the processing operation of the radio base station 1 when a condition is added to increase the synchronization signal transmission time interval stepwise.

  Assume that the initial state is a state in which the wireless base station 1 determines that all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off. It is determined whether or not the network is terminated (step S161). If the network is terminated, the network is terminated, and if the network is continued, it is determined whether or not the synchronization signal transmission time is reached (step S162). If it is not the synchronization signal transmission time, the process of step S161 is performed again. If it is the synchronization signal transmission time, it is determined whether transmission / reception has been performed since the previous transmission of the synchronization signal (step S163).

  If transmission / reception is performed, for example, the transmission time interval of the synchronization signal is returned to the normal value (step S164), and the synchronization signal is transmitted (step S165). If transmission / reception is not performed, the synchronization signal transmission time interval is set longer (step S166), and the synchronization signal is transmitted (step S167). Thereafter, the processing after step S161 is performed again.

  Thus, in the process of FIG. 25, normal operation is performed when transmission / reception is performed after the wireless base station 1 determines that all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off. While providing a mechanism for returning to the state (communication enabled state) with a small delay, the transmission time interval of the synchronization signal is increased stepwise. Thereby, the power consumption of the radio base station 1 can be reduced.

  A limit value may be provided for the transmission time interval of the synchronization signal that is increased in steps by the wireless base station 1 described above. FIG. 26 is a timing chart in the case where the transmission time interval of the synchronization signal is increased stepwise and a limit value is provided for the transmission time interval.

  In FIG. 26, when the wireless base station 1 determines that at least one wireless terminal station 2 is in a normal operation state (communication enabled state), the synchronization signal is transmitted with a synchronization signal transmission time interval of 100 milliseconds. The limit value of the transmission time interval of the synchronization signal that is lengthened in steps is set to 1 second. Processing operation for gradually increasing the transmission time interval of the synchronization signal after the wireless base station 1 determines that all the wireless terminal stations 2 are in a standby state (communication disabled state) including power-off at time t1 Is the same as FIG. When the transmission time interval of the synchronization signal reaches 1 second at time t4, the synchronization signal is transmitted with the transmission time interval of the synchronization signal as 1 second at t5, t6, and t7 thereafter.

  In this way, in the example of FIG. 26, a limit value is set for the transmission time interval of the synchronization signal that is increased stepwise. For example, when the wireless terminal station 2 receives the synchronization signal and then transmits the packet. Packet transmission can be performed without giving an excessive waiting time to the wireless terminal station 2.

  In addition to the above operation, the wireless base station 1 enters a standby state (communication disabled state) including power-off from the time when the wireless base station 1 transmits the synchronization signal to the time until the next synchronization signal is transmitted. It is also possible to migrate.

  FIG. 27 shows a normal operation state (communication enabled state) for a fixed time from the time when the radio base station 1 transmits a synchronization signal, and then a standby state (communication) including power-off until the next synchronization signal transmission time. It is a figure which shows the example which transfers to an impossible state.

  In FIG. 27, it is assumed that the transmission time interval of the synchronization signal is fixed at 1 second, and the radio base station 1 is in the normal operation state (communication enabled state) for 200 milliseconds after the transmission of the synchronization signal. The wireless base station 1 is in a normal operation state (communication enabled state) for 200 milliseconds after starting transmission of the synchronization signal at time t0. At time t1 when 200 milliseconds have elapsed from time t0, the radio base station 1 shifts to a standby state (communication disabled state) including power-off. The radio base station 1 returns to the normal operation state (communication enabled state) immediately before t2, which is the transmission time of the next synchronization signal, and transmits the synchronization signal at time t2. Thereafter, these operations are repeated.

  As shown in FIG. 27, the wireless base station 1 is in a normal operation state (communication enabled state) for a certain period of time from the time when the synchronization signal is transmitted, and then waits until the next synchronization signal is transmitted, including power-off. By shifting to the state (communication disabled state), it is possible to further reduce power consumption.

  After the wireless base station 1 determines that all the wireless terminal stations 2 are in a standby state (communication impossible state) including power off, the transmission power of the synchronization signal may be changed and transmitted.

  FIG. 28 illustrates an operation in which the wireless base station 1 determines that all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off, and then transmits by changing the transmission power of the synchronization signal. FIG.

  At time t0 in FIG. 28, before the radio base station 1 determines that all the radio terminal stations 2 are in a standby state (communication impossible state) including power-off, the broadcast information of the radio communication network included in the synchronization signal Is transmitted to the wireless terminal station 2 with a large transmission power of 20 dBm. At time t1, the wireless base station 1 notifies the wireless terminal station 2 of broadcast information of the wireless communication network after determining that all the wireless terminal stations 2 are in a standby state (communication impossible state) including power-off. Since there is no need, the transmission power of the synchronization signal is reduced to 0 dBm for transmission. Therefore, at time t2, which is the next synchronization signal transmission time, the transmission power of the synchronization signal is transmitted at 0 dBm. The synchronization signal is transmitted at 0 dBm at times t3 and t4 when the radio base station 1 transmits the synchronization signal thereafter.

  As shown in FIG. 28, after the radio base station 1 determines that all the radio terminal stations 2 are in a standby state (communication impossible state) including power-off, the transmission power of the synchronization signal is reduced and transmitted. , Power consumption can be kept low.

  After the radio base station 1 determines that all the radio terminal stations 2 are in a standby state (communication impossible state) including power-off, the transmission rate of the synchronization signal may be changed and transmitted.

  FIG. 29 illustrates an operation in which the radio base station 1 determines that all the wireless terminal stations 2 are in a standby state (communication impossible state) including power-off, and then changes the transmission rate of the synchronization signal to transmit. FIG.

  As shown at time t0 in FIG. 29, before wireless base station 1 determines that all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off, wireless communication included in the synchronization signal It is assumed that when the broadcast information of the network is reliably notified to the wireless terminal station 2, the synchronization signal is transmitted at a transmission rate with a long packet transmission time of 6 Mbps but a low packet error rate. At time t1, the wireless base station 1 notifies the wireless terminal station 2 of broadcast information of the wireless communication network after determining that all the wireless terminal stations 2 are in a standby state (communication impossible state) including power-off. Since there is no need, the transmission rate of the synchronization signal is 18 Mbps, but the packet error rate is high, but the transmission rate is such that the packet transmission time is shortened. Therefore, at time t2, which is the next synchronization signal transmission time, the transmission rate of the synchronization signal is transmitted at 18 Mbps. The synchronization signal is also transmitted at 18 Mbps at times t3 and t4 when the radio base station 1 transmits the synchronization signal thereafter.

  As shown in FIG. 29, after the radio base station 1 determines that all the radio terminal stations 2 are in a standby state (communication impossible state) including power-off, the transmission rate of the synchronization signal is increased and transmitted. The length of the packet can be shortened and the power consumption can be kept low.

  As described above, in the thirteenth embodiment, the form of the synchronization signal transmitted by the wireless base station 1 is changed depending on whether the wireless terminal station 2 is in a normal operation state or a standby state. Can be reduced.

(Fourteenth embodiment)
In the fourteenth embodiment, the radio base station 1 performs channel measurement.

  FIG. 30 is a block diagram showing an internal configuration of the radio base station 1 according to the fourteenth embodiment of the present invention. The processing unit 12 in the radio base station 1 of FIG. 30 includes a channel measurement unit 23 in addition to the configuration of FIG. The channel measurement unit 23 is not particularly limited in specific contents such as detection of whether or not another network exists, detection of whether or not a radar exists, and the like.

  FIG. 31 is a flowchart showing an example of processing operations performed by the radio base station 1 of FIG. The processing unit 12 illustrated in FIG. 30 determines the start of the network based on an input signal from the user interface unit 13 (step S171). If the start of the network is not requested, it waits for the network start request, and when the start of the network is requested, the processing unit 12 opens the network (step S172).

  After the network is established, the processing unit 12 performs data transmission / reception as necessary (step S177), and determines whether or not the network is terminated based on an input signal from the user interface unit 13 (step S173). If the end of the network is determined, the processing unit 12 performs a network end process (step S174).

  When the network continues, the wireless terminal station operation state management unit 17 makes all wireless terminal stations registered in the wireless base station 1 based on signals from the data transmission / reception unit 14 and the wireless terminal station management unit 15. It is determined whether 2 is in a standby state (communication impossible state) including power-off (step S175).

  If it is determined that all the wireless terminal stations 2 are not in a standby state (communication impossible state) including power-off, the network is continued as it is. When it is determined that all the wireless terminal stations 2 are in a standby state (communication disabled state) including power-off, the wireless terminal station operation state management unit 17 sends a channel measurement request command to the channel measurement unit 23. The channel measuring unit 23 measures the frequency channel based on the received signal from the data transmitting / receiving unit 14 (step S176). This channel measurement may be any type of channel measurement, such as detecting whether another network is present or detecting the presence of a radar.

  As described above, in FIG. 31, it is determined that all the wireless terminal stations 2 are in a standby state (communication impossible state) including power-off, and channel measurement is performed using a period during which data transmission / reception is not performed. Thus, efficient channel measurement can be performed.

  The measurement of the channel may be a measurement of a frequency channel used by the wireless communication network, or may be a measurement of a frequency channel not used by the wireless communication network.

  FIG. 32 is a diagram showing an example of four frequency channels that can be used by the wireless communication network. Of these, it is assumed that the wireless communication network selects and uses the frequency channel 2. In the above description, the channel measurement performed after the radio base station 1 determines that all the radio terminal stations 2 are in a standby state (communication impossible state) including power-off is the measurement of the frequency channel 2 shown in FIG. Alternatively, frequency channel 1, frequency channel 3, and frequency channel 4 may be measured. By measuring a frequency channel other than the frequency channel in use, the presence of other wireless communication networks using other channels, the presence of interference of other channels, and the like can be examined.

  As described above, in the fourteenth embodiment, when the radio communication network performs frequency channel switching and shifts to another frequency channel, an optimal shift destination frequency channel can be selected by channel measurement performed in advance. . Further, even when the measurement of interference of other systems is obligated by law or the like, channel measurement for efficient other system interference detection can be performed by performing channel measurement by this method.

(Fifteenth embodiment)
The fifteenth embodiment relates to a processing operation of the radio base station 1 when data is received from the radio terminal station 2.

  The radio base station 1 according to the fifteenth embodiment has the same configuration as that in FIG. FIG. 33 is a flowchart showing the processing operation of the radio base station 1 according to the fifteenth embodiment. After all the radio terminal stations 2 are determined to be in a standby state (communication impossible state) including power-off, the radio terminal stations 2 shows a processing operation of the radio base station 1 when data is received from 2.

  Assume that the initial state is a state in which the wireless base station 1 determines that all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off. The data transmission / reception unit 14 determines whether or not data has been received (step S181). If no data is received, the data transmission / reception unit 14 waits for data reception. If data is received, the transmission destination wireless terminal station 2 enters the wireless communication network. Whether it is registered or not is determined by inquiring the wireless terminal station management unit 15 (step S182). If the wireless terminal station 2 is not registered in the wireless communication network, the process is terminated, and if registered, data is transmitted / received (step S183).

  The wireless terminal station operation state management unit 17 determines the operation state of all the wireless terminal stations 2 (step S184), and ends if it is in a standby state (communication disabled state) including power-off, and is in a normal operation state (communication enabled state). ) Continue to send and receive data.

  As described above, in the fifteenth embodiment, the wireless terminal station 2 maintains the connection with the wireless terminal station 2 even after the wireless terminal station 2 shifts to a standby state (communication impossible state) including power-off. Application data can be transmitted and received without delay without registration processing.

(Sixteenth embodiment)
In the sixteenth embodiment, the operation of the application unit is controlled by the operation state of the wireless terminal station 2.

  FIG. 34 is a block diagram showing an internal configuration of the radio base station 1 according to the sixteenth embodiment of the present invention. The processing unit 12 in the radio base station 1 of FIG. 34 includes an application unit 24 that executes various applications in addition to the configuration of FIG.

  FIG. 35 is a flowchart showing processing operations of the radio base station 1 according to the sixteenth embodiment. The processing unit 12 illustrated in FIG. 34 determines the start of the network based on an input signal from the user interface unit 13 (step S191). If the start of the network is not requested, it waits for the network start request, and when the start of the network is requested, the processing unit 12 opens the network (step S192).

  After the network is established, the processing unit 12 performs data transmission / reception as necessary (step S197), and determines whether or not the network is terminated by an input signal from the user interface unit 13 (step S193). When the end of the network is determined, the processing unit 12 performs a network end process (step S194).

  When the network continues, the wireless terminal station operation state management unit 17 determines the wireless terminal station 2 registered in the wireless base station 1 based on signals from the data transmission / reception unit 14 and the wireless terminal station management unit 15. The operating state is determined (step S195). If it is determined that the wireless terminal station 2 is in the normal operation state (communication enabled state), the network is continued as it is. When it is determined that the wireless terminal station 2 is in a standby state (communication impossible state) including power-off, the wireless terminal station operation state management unit 17 issues an application process stop command to the application unit 24, The application unit 24 stops application processing (step S196).

  Thus, in the sixteenth embodiment, by stopping application processing and transmission of application data to the wireless terminal station 2 determined to have shifted to a standby state (communication disabled state) including power-off, The power consumption of the radio base station 1 can be reduced.

(Seventeenth embodiment)
In the seventeenth embodiment, processing is performed by the application unit 24 for each wireless terminal station 2.

  The radio base station 1 according to the seventeenth embodiment has the same block configuration as FIG.

  FIG. 36 is a flowchart showing the processing operation of the radio base station 1 according to the seventeenth embodiment. In this flowchart, the wireless base station 1 receives data from the wireless terminal station 2 after determining that all the wireless terminal stations 2 registered in the wireless base station 1 are in a standby state (communication impossible state) including power-off. The processing operation is shown.

  The initial state is assumed to be a state in which the wireless base station 1 determines that all the wireless terminal stations 2 are in a standby state (communication disabled state) including power-off. The data transmission / reception unit 14 determines whether or not data has been received (step S201). If the data is not received, the data transmission / reception unit 14 waits for data reception. If the data is received, the transmission destination wireless terminal station 2 establishes this wireless communication network. Is registered (step S202). Here, the determination process is performed by making an inquiry to the wireless terminal station management unit 15.

  If the wireless terminal station 2 is not registered in the wireless communication network, the wireless terminal station operation state management unit 17 determines whether all the wireless terminal stations 2 are in a standby state (communication disabled state) including power-off. If all wireless terminal stations 2 are in a standby state (communication disabled state) including power-off, the process is terminated. All wireless terminal stations 2 are in a standby state (communication disabled state) including power-off. If not, wait for data reception.

  If the wireless terminal station 2 is registered in the wireless communication network, the received data is transferred to the application unit 24 (step S204). If there is a data transmission request from the application unit 24 (step S205), data is transmitted to the wireless terminal station 2 (step S206), and if there is no transmission request, a timeout is determined (step S207).

  If it is not time-out, the process proceeds to step S204, and the received data is transferred again to the application unit 24. If it is time-out, the wireless terminal station operation state management unit 17 waits for all the wireless terminal stations 2 to include a power-off ( It is determined whether or not communication is possible (step S203). If all the wireless terminal stations 2 are in a standby state including a power-off (communication disabled state), the process is terminated. If all the wireless terminal stations 2 are not in a standby state including a power-off (communication disabled state), step S201 is performed. Return to and wait for data reception.

  Thus, in the seventeenth embodiment, the power consumption of the radio base station 1 can be reduced by performing application processing for each radio terminal station 2.

(Eighteenth embodiment)
The eighteenth embodiment relates to the processing operation of the wireless terminal station 2 that performs wireless communication with the wireless base station 1 of FIG.

  The radio base station 1 according to the eighteenth embodiment has the same internal configuration as FIG. FIG. 37 is a block diagram showing the internal configuration of the wireless terminal station 2 according to the eighteenth embodiment. The wireless terminal station 2 in FIG. 37 includes an antenna 31, a data transmission / reception unit 32, a memory unit 33, and a user interface unit 34.

  FIG. 38 is a flowchart showing an example of the processing operation of the wireless terminal station 2 of FIG. This flowchart shows the reception processing operation of the synchronization signal when the wireless terminal station 2 shifts to the normal operation state (communication enabled state).

  First, a transition is made to a normal operation state (communication enabled state), and a variable n for counting a time that is an integral multiple of the time interval of a normal synchronization signal is set to 1 (step S211). It is determined whether the time has passed by n × normal synchronization signal transmission time interval (step S212). If it has not elapsed, it waits until n × normal synchronization signal transmission time interval has elapsed, and if it has elapsed, a synchronization signal is received. It is determined whether or not (step S213).

  If the synchronization signal is received, data is transmitted and received (step S214), and it is determined whether or not the communication is completed (step S215). If the communication is not finished, data transmission / reception is continued, and if the communication is finished, the process is finished.

  If the synchronization signal is not received in step S213, it is determined whether or not the reception limit time of the synchronization signal has elapsed (step S216). If the reception limit time of the synchronization signal has elapsed, a scan process is performed (step S217). If the synchronization signal reception limit time has not been reached, a variable n for counting a time that is an integral multiple of the time interval of the normal synchronization signal is incremented by 1 (step S218), and thereafter, the processing after step S212 is repeated.

  Thus, in the eighteenth embodiment, when the radio terminal station 2 returns to normal operation, the radio base station 1 transmits the synchronization signal transmission time interval at an interval longer than the normal synchronization signal transmission time interval. Therefore, by waiting for reception of a synchronization signal longer than the normal synchronization signal transmission time interval, the same network as before entering the standby state (communication disabled state) including power-off is detected. Probability can be increased. In addition, when the radio base station 1 does not exist, it is possible to avoid infinitely waiting for the reception of the synchronization signal from the radio base station 1 and making communication impossible.

(Nineteenth embodiment)
In the nineteenth embodiment, when all the wireless terminal stations 2 registered in the wireless base station 1 are in a standby state (communication disabled state), the wireless base station 1 increases the transmission time interval of the synchronization signal. is there.

  The radio base station 1 according to the nineteenth embodiment has a block configuration similar to that in FIG. 5, and the radio terminal station 2 has a block configuration similar to that in FIG.

  FIG. 39 is a flowchart showing the processing operation of the wireless terminal station 2 according to the nineteenth embodiment. The data transmission / reception unit 32 determines whether to turn on the power based on the input signal from the user interface unit 34 (step S221).

  The data transmitting / receiving unit 32 inquires whether the memory unit 33 has the wireless communication network information (step S222). If there is wireless communication network information, data is transmitted / received using the wireless communication network information (step S223). If there is no wireless communication network information, a wireless communication network search is performed (step S224), and then a registration request packet. Is transmitted (step S225).

  After transmitting the registration request packet, if registration from the radio base station 1 to the radio communication network is permitted (step S226), data is transmitted / received (step S223). Is determined (step S227).

  If it is not time-out, the process returns to step S224, and the wireless communication network search is performed again. If it is time-out, a transition is made to a standby state (communication impossible state) including power-off (step S228).

  After starting the transmission / reception of data, it is determined whether or not the communication is completed (step S229). If the communication is continued, the data is transmitted / received (step S223). The network information is written in the memory or the like (step S230), and a transition is made to a standby state (communication impossible state) including power-off (step S228).

  FIG. 40 is a flowchart showing the processing operation of the radio base station 1 according to the nineteenth embodiment. The processing unit 12 determines the start of the network based on the input signal from the user interface unit 13 (step S241). If the start of the network is not requested, it waits for the network start request, and when the start of the network is requested, the processing unit 12 opens the network (step S242).

  After the network is established, the data transmitter / receiver 14 determines whether data has been received (step S243). If no data is received, the processing unit 12 determines whether or not the network is terminated based on an input signal from the user interface unit 13 (step S245). When the end of the network is determined, the processing unit 12 performs a network end process (step S244).

  If the network continues, the data transmission / reception unit 14 waits for reception of data, and if data is received, the data transmission / reception unit 14 determines whether the received data is a registration request packet (step S246). If it is not a registration request packet, the data transmitter / receiver 14 inquires of the wireless terminal station management unit 15 to determine whether or not the wireless terminal station 2 that is the data transmission destination is registered in the wireless communication network (step S247). .

  If the wireless terminal station 2 is not registered in the wireless communication network, no subsequent transmission / reception is performed, and the processes in and after step S243 are repeated. If the wireless terminal station 2 is registered in the wireless communication network, data transmission / reception with the wireless terminal station 2 is performed (step S248).

  If it is determined in step S246 that the received data is a registration request packet, the wireless terminal station management unit 15 is inquired to determine whether or not the wireless terminal station 2 is registered in the wireless communication network ( Step S249). If the wireless terminal station 2 is registered in the wireless communication network, data transmission / reception with the wireless terminal station 2 is performed (step S248). If not registered, the data transmission / reception unit 14 inquires of the wireless terminal station management unit 15 whether registration is possible or not, and performs registration determination (steps S250 and S251).

  If the registration of the wireless terminal station 2 is not permitted, the data transmitting / receiving unit 14 transmits a registration non-permission packet to the wireless terminal station 2 (step S252), and repeats the processing after step S243.

  If registration of the wireless terminal station 2 is permitted, registration is performed in the wireless terminal station management unit 15 (step S253), and the data transmitting / receiving unit 14 transmits a registration permission packet to the wireless terminal station 2 (step S254). Transmission / reception is started (step S248).

  After the start of transmission / reception, the wireless terminal station operation state management unit 17 determines the operation state of the wireless terminal station 2 (step S255). If it is determined that the wireless terminal station is in the normal operation state (communication enabled state), data transmission / reception is performed. Continue (step S248).

  If it is determined that the wireless terminal station management unit 15 is in a standby state including power-off (communication impossible state), the wireless terminal station management unit 15 does not delete the registration information of the wireless terminal station 2 and maintains the connection with the wireless terminal station 2 (Step S256). The wireless terminal station operation state management unit 17 determines whether all the wireless terminal stations 2 are in a standby state (communication disabled state) including power-off (step S257), and all the wireless terminal stations 2 If the wireless terminal station 2 is not in a standby state including a power-off (communication disabled state), the processing from step S243 is repeated, and if all the wireless terminal stations 2 are in a standby state including a power-off (communication disabled state), data transmission / reception is performed. A command for changing the transmission time interval of the synchronization signal is issued to the unit 14, and the transmission time interval of the synchronization signal is changed (step S258).

  As described above, the wireless base station 1 according to the nineteenth embodiment determines that all the wireless terminal stations 2 registered in the wireless communication network are in a standby state (communication disabled state) including power-off. The power consumption can be reduced by increasing the transmission time interval of the synchronization signal. In addition, the wireless base station 1 determines that the wireless terminal station 2 registered in the wireless communication network has shifted to a standby state (communication disabled state) including power-off, and then connects to the wireless terminal station 2. The wireless terminal station 2 keeps information of the wireless communication network in a nonvolatile memory or the like after transitioning to a standby state (communication impossible state) including power-off, so that the normal operation state (communication Since it is possible to send data without processing such as registration to the wireless communication network when returning to the (operable state), processing is started without causing the user to feel the delay when returning to the normal operation state (communication possible state) It becomes possible to do.

1 is a conceptual diagram of a wireless communication system 3 that performs wireless communication between a wireless base station 1 and a wireless terminal station 2 according to an embodiment of the present invention. FIG. 3 is a block diagram showing an example of the internal configuration of the radio base station 1. 3 is a flowchart showing an example of a change process of a synchronization signal transmission time interval performed by the radio base station 1 of FIG. 3 is a flowchart showing an example of a connection determination process performed by the radio base station 1 of FIG. The block diagram which shows the internal structure of the wireless base station 1 by 2nd Embodiment. The flowchart which shows an example of the change process of the synchronous signal transmission time interval which the wireless base station 1 of FIG. 5 performs. The flowchart which shows an example of the change process of the synchronous signal transmission time interval which the wireless base station 1 by 3rd Embodiment performs. The block diagram which shows the internal structure of the wireless base station 1 by 4th Embodiment. The flowchart which shows an example of the operation state judgment process of the radio | wireless terminal station 2 which the radio base station 1 of FIG. 8 performs. The block diagram which shows the internal structure of the wireless base station 1 by 5th Embodiment. 11 is a flowchart showing an example of operation state determination processing of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The block diagram which shows the internal structure of the wireless base station 1 by 6th Embodiment. 13 is a flowchart showing an example of operation state determination processing of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The block diagram which shows the internal structure of the wireless base station 1 by 7th Embodiment. The flowchart which shows an example of the operation state judgment process of the wireless terminal station 2 which the wireless base station 1 of FIG. 14 performs. The flowchart which shows the modification of FIG. The block diagram which shows the internal structure of the wireless base station 1 by 8th Embodiment. 18 is a flowchart showing an example of operation state determination processing of the wireless terminal station 2 performed by the wireless base station 1 of FIG. The figure which shows an example of an internal structure of the radio | wireless terminal station management part 15 in the radio base station 1. FIG. 18 is a flowchart showing an example of processing operation of the radio base station 1 according to the tenth embodiment. The figure which shows an example of the registration information table of the wireless terminal station 2 which the wireless terminal station management part 15 in the wireless base station 1 manages. The flowchart which shows an example of the process sequence until the wireless base station 1 and the wireless terminal station 2 transmit / receive data. The flowchart which shows an example of the change process of the synchronous signal transmission time interval which the wireless base station 1 by 12th Embodiment performs. The figure which shows the example which changes the transmission time interval of the synchronizing signal which the wireless base station 1 transmits in steps. The flowchart which shows an example of the processing operation of the radio | wireless base station 1 at the time of adding conditions to lengthening the transmission time interval of a synchronizing signal in steps. FIG. 6 is a timing chart when the transmission time interval of the synchronization signal is increased stepwise and a limit value is provided for the transmission time interval. The wireless base station 1 is in a normal operation state (communication enabled state) for a certain period of time from the time when the synchronization signal is transmitted, and then in a standby state (communication disabled state) including power-off until the next synchronization signal transmission time The figure which shows the example which transfers. The figure for demonstrating the operation | movement which changes and transmits the transmission power of a synchronizing signal, after the radio base station 1 judges that all the radio | wireless terminal stations 2 are in the standby state (communication impossible state) including power-off. The figure for demonstrating the operation | movement which changes and transmits the transmission rate of a synchronizing signal, after the radio base station 1 judges that all the radio | wireless terminal stations 2 are in the standby state (communication impossible state) including power-off. The block diagram which shows the internal structure of the wireless base station 1 by the 14th Embodiment of this invention. FIG. 31 is a flowchart showing an example of processing operations performed by the radio base station 1 of FIG. 30. FIG. The figure which showed the example of four frequency channels which this radio | wireless communication network can use. The flowchart which shows the processing operation of the wireless base station 1 by 15th Embodiment. The block diagram which shows the internal structure of the wireless base station 1 by the 16th Embodiment of this invention. The flowchart which shows the processing operation of the wireless base station 1 by 16th Embodiment. 18 is a flowchart showing processing operations of the radio base station 1 according to the seventeenth embodiment. The block diagram which shows the internal structure of the radio | wireless terminal station 2 by 18th Embodiment. 38 is a flowchart showing an example of processing operation of the wireless terminal station 2 of FIG. A flowchart showing a processing operation of the wireless terminal station 2 according to the nineteenth embodiment. A flowchart showing a processing operation of the radio base station 1 according to the nineteenth embodiment.

Explanation of symbols

1 wireless base station 2 wireless terminal station 3 wireless communication system 11 antenna 12 processing unit 13 user interface unit 14 data transmission / reception unit 15 wireless terminal station management unit 16 network state management unit 17 wireless terminal station operation state management unit 18 operation state management protocol processing Unit 19 communication status management unit 20 channel utilization rate measurement unit 21 time management unit 22 luminance measurement unit 23 channel measurement unit 24 application unit 31 antenna 32 data transmission / reception unit 33 memory unit 34 user interface unit

Claims (12)

In a radio base station that performs radio communication with one or more radio terminal stations using the same frequency channel,
Synchronization signal transmission control means for variably controlling a transmission time interval of a synchronization signal to be transmitted in order to synchronize with the wireless terminal station;
Connection information registration means for registering connection information necessary for connection with the wireless terminal station,
The wireless base station, wherein the connection information registering means maintains the registered connection information even after communication with the wireless terminal station is completed. Comprising an operation state determination means for determining an operation state of the wireless terminal station;
The radio base station according to claim 1, wherein the synchronization signal transmission control unit variably controls a transmission time interval of the synchronization signal based on a determination result of the operation state determination unit.   The synchronization signal transmission control means determines the transmission time interval of the synchronization signal when the operation state determination means determines that the wireless terminal station is in a communication disabled state, and when the wireless terminal station is in a communication enabled state, 3. The radio base station according to claim 2, wherein the radio base station is set to be longer than a transmission time interval of the synchronization signal when determined by the operation state determination means.   The synchronization signal transmission control means, when it is determined by the operation state determination means that all the wireless terminal stations corresponding to all the connection information registered in the connection information registration means is in a communication disabled state, The radio base station according to claim 3, wherein a transmission time interval of the synchronization signal is increased.   The operation state determination means is an operation transmitted from the wireless terminal station to determine whether or not all the wireless terminal stations corresponding to all connection requests registered in the connection information registration means are in a communication disabled state. 5. The radio base station according to claim 3, wherein the determination is made by a state management protocol.   The synchronization signal transmission control means, when the operation state determination means determines that the wireless terminal station having increased the transmission time interval of the synchronization signal has returned from the communication disabled state to the communication enabled state, 6. The radio base station according to claim 3, wherein a transmission time interval is shortened. A number of times determination means for determining whether or not the number of times a response to the packet transmitted to the wireless terminal station has not returned exceeds a predetermined number of times,
The radio base station according to claim 2, wherein the operation state determination unit determines an operation state of the radio terminal based on a determination result of the frequency determination unit.   Data from any of the wireless terminal stations after the operation determining means determines that all the wireless terminal stations corresponding to all connection requests registered in the connection information registering means are in a communication disabled state 3. A communication control means for specifying and responding to a wireless terminal station that has transmitted the data based on connection information registered in the connection information registration means when receiving The radio base station according to any one of 7.   The connection information registration unit registers the connection information including at least one of identification information, performance information, wireless communication method information, and transmission data type of the wireless terminal station. The radio base station according to the above.   The radio base station according to any one of claims 1 to 9, wherein the synchronization signal transmission control means variably controls the transmission time interval of the synchronization signal in a stepwise manner. In a wireless terminal station that performs wireless communication with a wireless base station,
Connection information registration means for storing connection information necessary for wireless communication with the wireless base station, including transmission time interval information of a synchronization signal transmitted from the wireless base station to achieve synchronization;
When returning from the power-off or standby state (communication disabled state) to the normal operation state (communication enabled state), the synchronization signal is received for a period longer than the synchronization signal transmission time interval stored in the connection information registration means. And a communication control means for waiting. In a wireless communication method of performing wireless communication using the same frequency channel between a wireless base station and one or more wireless terminal stations,
The wireless terminal station includes, in a first connection information storage unit, connection information necessary for wireless communication with the wireless base station, including a transmission time interval of a synchronization signal transmitted for synchronization from the wireless base station. Remember,
The radio base station is
Storing connection information necessary for connection with all the connected wireless terminal stations in the second connection information storage unit;
When all the wireless terminal stations corresponding to all connection information stored in the second connection information storage unit are in a communication disabled state, the transmission time interval of the synchronization signal is lengthened,
When any of the wireless terminal stations returns to a communicable state, wireless communication with the wireless terminal station is performed based on connection information of the wireless terminal station stored in the second connection information storage unit A wireless communication method characterized by the above.

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