JP5952717B2 - Wireless communication apparatus and wireless communication method - Google Patents

Description

  The present invention relates to a wireless communication apparatus and a wireless communication method for managing a plurality of wireless systems.

  In recent years, wireless communication from wireless terminal stations, such as public hotspot services at homes, offices, stations and airports, can be used as access lines, and the Internet can be used through broadband lines typified by optical lines. The environment is spreading. In particular, many recent broadband routers have a built-in wireless LAN (Local Area Network) communication function, and notebook computers have a built-in Bluetooth (registered trademark) communication function in addition to the wireless LAN communication function. The number of models is increasing, and a wireless communication environment can be easily constructed at home and in the office. Under such circumstances, there is an increasing need to install a wireless gateway device in a home or office to support a plurality of wireless systems or to flexibly support a new wireless system.

  At present, wireless gateway devices represented by broadband routers for network connection and wireless base stations or wireless gateway devices for various wireless terminal stations used in homes and offices have been developed and developed as different devices. . Therefore, in order to receive a plurality of wireless system services at the same time, it is necessary to install a plurality of different wireless gateway devices, and the installation cost is a problem. In addition, in order to receive a new wireless system service, it was necessary to install and renew new wireless gateway devices one after another.

  As a prior art, in the technique described in Patent Document 1, the wireless gateway device has a simplified configuration including only a wireless signal receiving unit, a digitized received signal (analog-digital converting unit), and a digital signal transmitting unit. . A reception signal digitized by the wireless gateway device can be transmitted to a signal processing server via a network, and processing such as demodulation and decoding of the reception signal can be performed.

  In the technique described in Patent Document 2, the wireless gateway device determines a device (wireless gateway device or signal processing server) that performs signal processing based on the detected wireless method, or software signal used in the wireless gateway device. The processing can be downloaded from the program server on the network in time and the signal processing unit can be written.

  According to the configuration using the techniques of Patent Document 1 and Patent Document 2, the software signal processing on the signal processing server side is changed to provide a plurality of wireless system services including a new wireless system. Therefore, it can be expected to solve the cost problem by installing / renewing a new wireless gateway device.

  In addition, in such a wireless gateway system configuration, it can be assumed that it is used as a network that mediates a wide area network such as the Internet or WAN (Wide Area Network), but is not limited to this and is represented by an office network or a home network. In a LAN environment, a personal computer may be used as a signal processing server, or a device such as a home gateway or a service gateway may be used.

  Hereinafter, the radio access system is referred to as a flexible wireless system, and a radio base station in the flexible wireless system is referred to as a flexible radio base station.

JP 2007-166278 A JP 2009-231903 A JP 2010-56653 A

IEEE Std 802.11TM-2007, "Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications," IEEE Computer Society, June 2007.

  In the case of the configuration using the techniques of Patent Literature 1 and Patent Literature 2, the flexible radio base station arranges the transmission antenna and the reception antenna at a short distance. Also, the flexible radio base station can flexibly rewrite the radio system manager so that a radio system corresponding to the detected radio system can be used, or rewrite the radio system manager so as to delete the radio system that is no longer used. It is required to be operational. For this reason, it is necessary for each wireless system to operate according to an existing mechanism without adding a function. Therefore, it is assumed that the plurality of radio systems accommodated in the flexible radio base station do not have a function of recognizing each other's operation. For example, when the flexible radio base station accommodates the radio scheme A and the radio scheme B, a situation occurs in which the radio scheme B cannot recognize that the radio scheme A is transmitting a radio signal.

  Considering this situation, when a plurality of radio systems are accommodated and a radio system using carrier sense is included, there is a problem that the radio system using carrier sense has a reduced chance of transmitting a radio signal. . Carrier sense is a function to avoid collision of radio signals. A radio terminal station trying to transmit radio signals confirms the usage status of radio channels, and other radio terminal stations transmit radio signals. This is a method of avoiding a collision by waiting for transmission of a radio signal during the operation. As a wireless method using carrier sense, for example, as described in Non-Patent Document 1, a wireless LAN system defined by the IEEE 802.11 committee is representative.

  As an example of the occurrence of the above-described problem, consider a situation in which a flexible radio base station accommodates radio scheme A and radio scheme B that use carrier sense and use different frequencies. In this situation, first, when the wireless system A is activated, the flexible wireless base station performs carrier sense and transmits a wireless signal using the channel determined to be usable. Next, when the wireless system B is activated, as in the wireless system A, the flexible wireless base station performs carrier sense in order to detect an available channel. Here, since the frequencies used by the wireless system A and the wireless system B are different, the carrier sense performed by the wireless system B does not detect the wireless signal transmitted by the wireless system A and the channel is used. There is no judgment.

  However, since the flexible radio base station has the transmitting antenna and the receiving antenna arranged at a short distance, the carrier sense performed by the wireless method B detects the out-of-band radiation of the wireless signal transmitted by the wireless method A. , It is determined that the channel is being used. This phenomenon occurs in all channels that can be used in the wireless system B. Therefore, the wireless system B cannot transmit a wireless signal. As a result, the radio system B has a reduced opportunity to transmit radio signals.

  In order to solve such a problem, Patent Document 3 proposes an interference avoidance method in which a plurality of wireless methods realize simultaneous transmission or simultaneous reception. In this interference avoidance method, as a premise, a system has been proposed in which a wireless base station using a wireless LAN system and a wireless terminal station using a WiMAX (registered trademark) system are accommodated in the same housing. In this interference avoidance method, the wireless LAN system uses a PSMP (Power Save Multi-Poll) procedure defined in the IEEE 802.11n standard. In the PSMP procedure, a wireless base station that uses a wireless LAN system transmits a PSMP frame to wireless terminal stations that use all of the subordinate wireless LAN systems. The PSMP frame includes a downlink start timing at which the radio base station transmits a signal to the radio terminal station, an uplink start timing at which the radio terminal station transmits a signal to the radio base station, and transmission / reception of a signal assigned to each radio terminal station. Has information representing timing. On the other hand, in the WiMAX (registered trademark) system, the downlink period described in the PSMP frame is synchronized with the uplink period in the WiMAX (registered trademark) system, and the uplink period described in the PSMP frame is synchronized with the WiMAX (registered trademark) system. Synchronize with the downlink period at.

  According to the above procedure, the interference avoidance method described in Patent Document 3 is based on the fact that the housing that accommodates the wireless base station that uses the WLAN system and the wireless terminal station that uses the WiMAX (registered trademark) system has the wireless signal of the WLAN system. And simultaneous transmission or reception of wireless signals of WiMAX (registered trademark) system.

  However, as is clear from the above procedure, the interference avoidance method described in Patent Document 3 is a wireless LAN system that can use the PSMP procedure and a TDD (Time Division) that is a duplex method that distinguishes the downlink period and the uplink period. This is a method based on a WiMAX (registered trademark) system that can use Duplex). Therefore, there is a problem that it cannot be applied to a flexible wireless system that performs operations such as addition or deletion of a radio system as appropriate according to a user request.

  The present invention has been made in view of such circumstances, and a wireless communication device using carrier sense can operate simultaneously with other wireless communication devices without depending on the wireless method. An object is to provide a communication device and a wireless communication method.

  The present invention is a wireless communication apparatus that performs wireless communication with a terminal apparatus using a plurality of wireless systems that use different frequencies, and performs a first carrier sense implementation that performs carrier sense using a first wireless system And a first communication means for performing wireless communication with the terminal device based on a result of performing carrier sense by the first carrier sense implementation means, and a first for performing carrier sense using the second wireless method. Second carrier sense implementation means, second communication means for performing wireless communication with the terminal device based on the result of carrier sense performed by the second carrier sense implementation means, and a transmission request for the second radio scheme When the first radio scheme transmission request occurs, the system waits until the first radio scheme transmission request is generated, and before the first carrier sense execution means performs the first radio scheme transmission request in response to the first radio scheme transmission request. Control for controlling the operation of the second carrier sense implementation means so that the start timing and implementation period of the carrier sense coincide with the start timing and implementation period of the carrier sense performed by the second carrier sense implementation means Means.

  The present invention is a wireless communication apparatus that performs wireless communication with a terminal apparatus using a plurality of wireless systems that use different frequencies, and performs a first carrier sense implementation that performs carrier sense using a first wireless system And a first communication means for performing wireless communication with the terminal device based on a result of performing carrier sense by the first carrier sense implementation means, and a first for performing carrier sense using the second wireless method. Second carrier sense implementation means, second communication means for performing wireless communication with the terminal device based on the result of carrier sense performed by the second carrier sense implementation means, and the first carrier sense implementation means When the transmission request of the second wireless method is generated during the carrier sense, the end timing of the carrier sense being executed and the second null Control means for controlling the operation of the second carrier sense implementation means so as to coincide with the end timing of the carrier sense by the second carrier sense implementation means performed in response to the transmission request of the system It is characterized by.

  The present invention is a wireless communication method performed by a wireless communication apparatus that performs wireless communication with a terminal apparatus using a plurality of wireless systems that use different frequencies, and performs carrier sense using the first wireless system. A first carrier sensing step, a first communication step for performing wireless communication with the terminal device based on a result of carrier sensing performed in the first carrier sensing step, and a second wireless method. A second carrier sense performing step for performing carrier sense; a second communication step for performing wireless communication with the terminal device based on a result of performing carrier sense in the second carrier sense performing step; When a wireless transmission request is generated, the wireless communication device waits until the first wireless transmission request is generated and responds to the first wireless transmission request. The second carrier so that the start timing and execution period of the carrier sense in the first carrier sense execution step coincide with the start timing and execution period of the carrier sense in the second carrier sense execution step. And a control step for controlling the operation of the sense execution step.

  The present invention is a wireless communication method performed by a wireless communication apparatus that performs wireless communication with a terminal apparatus using a plurality of wireless systems that use different frequencies, and performs carrier sense using the first wireless system. A first carrier sensing step, a first communication step for performing wireless communication with the terminal device based on a result of carrier sensing performed in the first carrier sensing step, and a second wireless method. A second carrier sense performing step for performing carrier sense; a second communication step for performing wireless communication with the terminal device based on a result of performing the carrier sense in the second carrier sense performing step; During the execution of the carrier sense in the carrier sense execution step, when a transmission request for the second wireless method is generated, The second carrier sense execution is performed so that the carrier sense end timing coincides with the carrier sense end timing according to the second carrier sense execution step performed in response to the transmission request of the second radio system. And a control step for controlling the operation of the step.

  According to the present invention, it is possible to obtain an effect that a wireless communication device using a carrier sense can operate simultaneously with other wireless communication devices without depending on the wireless method.

It is a block diagram which shows the structure of 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the flexible radio base station 1 in 1st Embodiment. It is a sequence diagram which shows the communication sequence of the flexible radio base station 1 and the radio | wireless terminal stations 2 and 3 in 1st Embodiment. It is a sequence diagram which shows the communication sequence of the flexible radio base station 1 and the radio | wireless terminal stations 2 and 3 when this invention is not applied. It is a flowchart which shows operation | movement of the flexible radio base station 1 in 2nd Embodiment. It is a sequence diagram which shows the communication sequence of the flexible radio base station 1, the radio | wireless terminal stations 2, and 3 in 2nd Embodiment. It is a sequence diagram which shows the communication sequence of the flexible radio base station 1 and the radio | wireless terminal stations 2 and 3 when this invention is not applied.

<First Embodiment>
Hereinafter, a wireless communication apparatus according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In the first embodiment, the timing at which one radio system starts carrier sense and the period during which carrier sense is performed are matched with the other radio system. Here, the wireless system A (first wireless system) and the wireless system B (second wireless system) are wireless systems that use carrier sense and use different frequencies. Further, the wireless system A is a wireless system having a higher priority than the wireless system B. In addition, the priority in 1st Embodiment shall be able to be set suitably by the user who utilizes.

  The flexible radio base station 1 shown in FIG. 1 includes a radio system management unit 11, a control unit 12, a radio system A carrier sense implementation unit 13 and a communication unit 14, and a radio system B carrier sense implementation unit 15 and a communication unit 16. ing. The radio system management unit 11 manages the radio system accommodated in the flexible radio base station 1. Specifically, the radio system management unit 11 manages the priority of each radio system and whether or not a radio signal transmission request is generated.

  The control unit 12 controls the timing for starting carrier sense and the period for performing carrier sense, and notifies the carrier sense performing units 13 and 15 of the timing for starting carrier sense and the period for performing carrier sense. Specifically, when a transmission request for a radio signal is generated in a radio system with high priority (in this case, radio system A), the time when the transmission request is generated is set as a timing at which radio system A starts carrier sense. The period for carrying out carrier sense is calculated in accordance with the regulations of the wireless system A.

  On the other hand, when a transmission request for a wireless signal is generated in a wireless method with a low priority (here, wireless method B), the wireless method B is a carrier until a transmission request is generated in a wireless method with a high priority (wireless method A). Wait for the sense to start. The timing at which the wireless system B starts carrier sense is set to the same timing as the wireless system A starts carrier sensing, and the wireless system A performs carrier sense during the period when the wireless system B performs carrier sensing. Set to the same period as the period.

  The carrier sense execution units 13 and 15 of the wireless systems A and B perform carrier sense according to the timing and the execution period notified from the control unit 12. The communication units 14 and 16 of the wireless systems A and B transmit and receive wireless signals.

  The wireless terminal station 2 of the wireless system A includes a communication unit 21. The wireless terminal station 3 of the wireless system B includes a communication unit 31. The communication units 21 and 31 of the wireless systems A and B transmit and receive wireless signals.

  Next, operations of the flexible wireless base station 1 and the wireless terminal stations 2 and 3 in the first embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing the operation of the flexible radio base station 1 in the first embodiment. FIG. 3 is a sequence diagram showing a communication sequence of the flexible wireless base station 1 and the wireless terminal stations 2 and 3 in the first embodiment.

  First, when a transmission request for a wireless signal is generated (step S1), the wireless system management unit 11 determines whether the priority of the wireless system for which the transmission request has been generated is high (step S2). As a result of the determination, if the priority of the wireless method in which the transmission request is generated is not high, the wireless method management unit 11 waits until a transmission request is generated for a wireless method with a high priority (step S3).

  On the other hand, when the priority of the wireless method for which the transmission request has occurred is high, the control unit 12 calculates a period during which the wireless method performs carrier sense in accordance with the wireless method specification (step S4). Then, the wireless method management unit 11 determines whether or not a transmission request is generated for a wireless method with a lower priority (step S5). As a result of this determination, if a transmission request is not generated for a wireless method with a low priority, the carrier sense performing unit 13 of the wireless method with a high priority performs carrier sense (step S6). At this time, the high-priority wireless carrier sense execution unit 13 performs carrier sense according to the calculated carrier sense period.

  On the other hand, if a transmission request is generated for a wireless method with a low priority, the control unit 12 performs carrier sensing for the wireless method with a high priority with respect to the carrier sense performing unit 15 for the wireless method with a low priority. The period to perform is notified (step S7). The high-priority wireless method carrier sense execution unit 13 and the low-priority wireless method carrier sense execution unit 15 perform carrier sense (step S8). At this time, the high-priority wireless carrier sense execution unit 13 performs carrier sense according to the calculated carrier sense period. Then, the carrier sense execution unit 15 of the wireless system with low priority performs carrier sense according to the period during which the notified wireless system with high priority performs carrier sense.

  Next, the control unit 12 determines whether it is determined as idle (available channel is detected) (step S9). If it is not determined as idle, the control unit 12 returns to step S4 and repeats the process. On the other hand, when it is determined as idle, the communication units 14 and 16 transmit radio signals (step S10).

  Next, the processing operation shown in FIG. 2 will be described with a specific example. First, in the flexible wireless base station 1, when a transmission request for a wireless signal is generated in the wireless system A, the wireless system management unit 11 in the flexible wireless base station 1 manages (understands) that the priority of the wireless system A is high. Therefore, the control unit 12 sets the time when the transmission request is generated as the timing at which the wireless system A starts carrier sense, and calculates the period during which the wireless system A performs carrier sense in accordance with the regulations of the wireless system A To do. Then, the control unit 12 notifies the timing and implementation period to the carrier sense implementation unit 13 of the wireless system A. And the carrier sense implementation part 13 of the radio | wireless system A starts a carrier sense according to the notified timing.

  Next, in the flexible radio base station 1, when a radio signal transmission request is generated in the radio system B, the radio system management unit 11 manages (knows) that the priority of the radio system B is low. 12 waits for the wireless system B to start carrier sense until a transmission request is generated in the wireless system A. When the carrier sense execution unit 13 of the wireless system A finishes the carrier sense according to the notified execution period and an available channel is detected (determined as idle), the communication unit 14 of the wireless system A Transmits a radio signal to the radio terminal station 2 using the radio system A. In the wireless terminal station 2, the communication unit 2 receives a wireless signal.

  Next, in the flexible radio base station 1, when a transmission request for a radio signal is generated in the radio system A, the radio system management unit 11 sets the radio system A to have a higher priority and to a radio system B having a lower priority. Since the transmission request is managed (understood), the control unit 12 sets the time when the transmission request of the wireless system A is generated as the timing at which the wireless system A and the wireless system B start carrier sense. Then, the period during which the wireless system A and the wireless system B perform carrier sense is calculated according to the regulations of the wireless system A. And the control part 12 notifies this timing and implementation period to the carrier sense implementation parts 13 and 15 of the radio system A and the radio system B.

  The carrier sense implementation units 13 and 15 of the wireless system A and the wireless system B perform carrier sense according to the notified timing and execution period, and when an available channel is detected (determined as idle), the wireless The communication unit 14 of the method A transmits a radio signal to the wireless terminal station 2 that uses the wireless method A, and the communication unit 16 of the wireless method B wirelessly transmits to the wireless terminal station 3 that uses the wireless method B. Send a signal. And in the radio | wireless terminal station 2 and the radio | wireless terminal station 3, each of the communication parts 21 and 31 receives a radio signal.

  This series of processing operations can solve the problem that the number of opportunities for the wireless system to transmit a wireless signal decreases because an available channel is not detected (determined as busy). As shown in FIG. 4, when the above-described series of processing operations is not applied, the wireless signal transmitted by the wireless method A that has been previously transmitted is detected by the wireless method B that has been transmitted later. The problem of end up occurs. However, the situation in which such a problem occurs can be avoided by performing the processing operations shown in FIGS.

  Note that interference occurs when a plurality of radio systems using the same frequency transmit radio signals simultaneously. In order to avoid this interference, when a certain frequency is used for a plurality of radio systems, the carrier sense execution units 13 and 15 determine that a channel is available for this frequency (determine that it is idle). It is necessary to limit the radio system to one.

  As described above, when the flexible radio base station 1 accommodates a plurality of radio systems and includes a radio system using carrier sense, the radio system using carrier sense can operate simultaneously with other radio systems. In addition, by setting the priority for the radio system to be accommodated, the timing for starting carrier sense and the period for performing carrier sense are controlled, thereby reducing the chance that the radio system using carrier sense transmits a radio signal. Can solve the problem. The series of processing operations described above are performed when the flexible radio base station 1 accommodates a plurality of radio schemes and includes a radio scheme using carrier sense. Details of each radio scheme are as follows. Therefore, the present invention can be applied without depending on the wireless system.

Second Embodiment
Next, a radio communication apparatus according to the second embodiment of the present invention will be described. In the second embodiment, the timing at which one radio system ends carrier sense is matched with the other radio system. The apparatus configuration in the second embodiment is the same as the apparatus configuration shown in FIG. However, unlike the first embodiment, it is not necessary to set the priority in the wireless system. Here, description of the same processing operation as that described in the first embodiment will be omitted, and only the difference will be described.

  The radio system management unit 11 manages the radio system accommodated in the flexible radio base station 1. Specifically, the radio system management unit 11 manages the presence / absence of carrier sense for each radio system. The control unit 12 controls the timing to end the carrier sense and notifies the carrier sense execution units 13 and 15 of this timing. Specifically, when a wireless signal transmission request is generated in the wireless system A, if the wireless system other than the wireless system A is not performing carrier sense, the wireless system A detects the time when this transmission request is generated. Is set as the timing for starting the carrier sense, and the timing for ending the carrier sense is calculated according to the rules of the wireless system A.

  On the other hand, when a wireless signal transmission request is generated in the wireless system B, if a wireless system other than the wireless system B (wireless system A) performs carrier sense, the wireless system B determines the time when this transmission request is generated. The timing at which carrier sense is started is set, and the timing at which carrier sense is ended is set at the same timing as the timing at which wireless system A ends carrier sense. The carrier sense execution units 13 and 15 perform carrier sense according to the timing notified from the control unit 12.

  Next, operations of the flexible radio base station 1 and the radio terminal stations 2 and 3 in the second embodiment will be described with reference to FIGS. FIG. 5 is a flowchart showing the operation of the flexible radio base station 1 in the second embodiment. FIG. 6 is a sequence diagram showing a communication sequence of the flexible radio base station 1 and the radio terminal stations 2 and 3 in the second embodiment.

  First, when a transmission request for a radio signal is generated (step S11), the radio system management unit 11 determines whether another radio system (a radio system other than the radio system for which the transmission request has been generated) is performing carrier sense. Determination is made (step S12). If the result of this determination is that another radio system is not carrying out carrier sense, the control unit 12 calculates the timing for ending carrier sense in accordance with the regulations of the radio system in which the transmission request is generated (step S13). Then, the carrier sense execution unit 13 (or the carrier sense execution unit 15) of the wireless system that has generated the transmission request performs carrier sense (step S14). At this time, the carrier sense implementation unit 13 (or carrier sense implementation unit 15) of the radio system that has generated the transmission request performs carrier sense according to the timing at which the calculated carrier sense is terminated.

  On the other hand, if another radio system is carrying out carrier sense, the control unit 12 notifies the timing at which the other radio system ends carrier sense to the radio system in which the transmission request is generated (step S15). . Then, the carrier sense implementation units 13 and 15 of the wireless system in which the transmission request is generated and another wireless system perform carrier sensing (step S16). At this time, the carrier sense implementation unit 13 (or the carrier sense implementation unit 15) of the wireless system in which the transmission request is generated performs carrier sense according to the notified timing at which the other wireless system ends the carrier sense. Further, the carrier sense execution unit 15 (or the carrier sense execution unit 13) of another radio system performs carrier sense according to the calculated timing of ending carrier sense.

  Next, the control unit 12 determines whether or not it is determined to be idle (a usable channel is detected) (step S17). If it is not determined to be idle, the control unit 12 returns to step S12 and repeats the process. On the other hand, when it is determined as idle, the communication units 14 and 16 transmit radio signals (step S18).

  Next, the processing operation shown in FIG. 5 will be described with a specific example. First, in the flexible radio base station 1, when a transmission request for a radio signal is generated in the radio system A, the radio system management unit 11 manages (understands) that a radio system other than the radio system A is not performing carrier sense. Therefore, the control unit 12 sets the time when the transmission request is generated as the timing when the wireless method A starts carrier sense, and calculates the timing when the wireless method A ends the carrier sense according to the rules of the wireless method A To do. The control unit 12 notifies the timing to the carrier sense execution unit 13 of the wireless system A. The carrier sense implementation unit 13 of the wireless system A starts carrier sense according to the notified timing.

  Next, in the flexible radio base station 1, when a transmission request for a radio signal is generated in the radio system B, the radio system management unit 11 performs a carrier sense in a radio system other than the radio system B (radio system A). Therefore, the control unit 12 sets the time when the transmission request is generated as the timing when the wireless method B starts carrier sense, and sets the timing when the wireless method A ends the carrier sense as the wireless method. Set as the timing when B ends carrier sense. Then, the control unit 12 notifies the timing to the carrier sense performing unit 15 of the wireless system B. The wireless system B carrier sense execution unit 15 starts carrier sense according to the notified timing.

  Next, the carrier sense execution units 13 and 15 of the wireless system A and the wireless system B end the carrier sensing according to the notified timing, and when an available channel is detected (determined as idle), The communication unit 14 of the method A transmits a radio signal to the wireless terminal station 2 that uses the wireless method A, and the communication unit 16 of the wireless method B wirelessly transmits to the wireless terminal station 3 that uses the wireless method B. Send a signal. In the wireless terminal station 2 and the wireless terminal station 3, each of the communication units 21 and 31 receives a wireless signal.

  As a result of this series of operations, as shown in FIG. 6, it is possible to solve the problem that the opportunity for the radio system to transmit a radio signal is reduced because an available channel is not detected (determined as busy). . As shown in FIG. 7, when the above-described series of processing operations are not applied, the timing at which the carrier sense is finished is later than that of the wireless method A when the wireless signal transmitted by the wireless method that has finished carrier sense first is transmitted. This causes a problem that the wireless method is detected. However, by executing the processing operations shown in FIGS. 5 and 6, it is possible to avoid a situation in which such a problem occurs.

  Note that interference occurs when a plurality of radio systems using the same frequency transmit radio signals simultaneously. In order to avoid this interference, when a certain frequency is used for a plurality of radio systems, the carrier sense execution units 13 and 15 determine that a channel is available for this frequency (determine that it is idle). It is necessary to limit the radio system to one.

  As described above, when the flexible radio base station 1 accommodates a plurality of radio systems and includes a radio system using carrier sense, the radio system using carrier sense can operate simultaneously with other radio systems. In addition, by controlling the timing to end the carrier sense, it is possible to solve the problem that the radio system using the carrier sense reduces the chance of transmitting a radio signal. The series of processing operations described above are performed when the flexible wireless base station 1 accommodates a plurality of wireless systems and includes a wireless system that uses carrier sense. Details of each wireless system Therefore, the present invention can be applied without depending on the wireless system.

  In the first and second embodiments, when the flexible radio base station 1 accommodates two radio systems, the processing operation for controlling the timing for starting / ending carrier sense and the period for performing carrier sense has been described. However, the number of radio systems accommodated by the flexible radio base station 1 may be three or more.

  As described above, in the flexible wireless system that manages multiple wireless systems, carrier sense start / end timing and carrier sense are implemented so that the wireless system using carrier sense can operate simultaneously with other wireless systems. To control the period. Thus, when a flexible radio base station accommodates a plurality of radio schemes and includes a radio scheme using carrier sense, a radio signal transmitted by a certain radio scheme uses a carrier sense other than this radio scheme. By detecting the radio scheme by carrier sense, it is possible to solve the problem that the radio scheme using carrier sense reduces the chance of transmitting a radio signal. Also, it is implemented when the flexible radio base station accommodates a plurality of radio systems and includes a radio system that uses carrier sense, and it is not necessary to understand the detailed operation of each radio system. It can be applied without depending on the wireless system.

  Note that a program for realizing the function of the processing unit in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute wireless communication processing. You may go. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Accordingly, additions, omissions, substitutions, and other changes of the components may be made without departing from the technical idea and scope of the present invention.

  The present invention can be applied to applications where it is indispensable that a radio scheme using carrier sense operates simultaneously with other radio schemes without depending on the radio scheme.

  DESCRIPTION OF SYMBOLS 1 ... Flexible radio base station, 11 ... Radio system management part, 12 ... Control part, 13 ... Carrier sense implementation part (Radio system A, 1st radio system), 14 ... Communication Parts (wireless system A, first wireless system), 15 ... carrier sense implementation part (wireless system B, second wireless system), 16 ... communication part (wireless system B, second wireless system) 2... Wireless terminal station (wireless system A, first wireless system) 3... Wireless terminal station (wireless system B, second wireless system)

Claims (4)

A wireless communication device that performs wireless communication with a terminal device using a plurality of wireless systems that use different frequencies,
First carrier sense implementation means for performing carrier sense using the first wireless system;
First communication means for performing wireless communication with the terminal device using the first wireless method based on a result of carrier sense performed by the first carrier sense implementation means;
Second carrier sense implementation means for performing carrier sense using the second wireless system;
Second communication means for performing wireless communication with the terminal device using the second wireless method based on a result of carrier sensing performed by the second carrier sense performing means;
When a transmission request for the second wireless method is generated, it waits until a transmission request for the first wireless method is generated, and in response to the transmission request for the first wireless method, the first carrier sense is performed. The start timing and execution period of the carrier sense performed by the execution means and the start timing and execution period of the carrier sense performed by the second carrier sense execution means coincide with each other. And a control means for controlling the operation. A wireless communication device that performs wireless communication with a terminal device using a plurality of wireless systems that use different frequencies,
First carrier sense implementation means for performing carrier sense using the first wireless system;
First communication means for performing wireless communication with the terminal device using the first wireless method based on a result of carrier sense performed by the first carrier sense implementation means;
Second carrier sense implementation means for performing carrier sense using the second wireless system;
Second communication means for performing wireless communication with the terminal device using the second wireless method based on a result of carrier sensing performed by the second carrier sense performing means;
When the transmission request for the second wireless method is generated while the first carrier sense execution unit is performing the carrier sense, the end timing of the carrier sense being executed and the second wireless method Control means for controlling the operation of the second carrier sense implementation means so that the end timing of the carrier sense by the second carrier sense implementation means performed in response to a transmission request matches. A wireless communication device. A wireless communication method performed by a wireless communication device that performs wireless communication with a terminal device using a plurality of wireless systems that use different frequencies,
A first carrier sense implementation step of performing carrier sense using a first wireless method;
A first communication step of performing wireless communication with the terminal device using the first wireless method based on a result of performing carrier sense in the first carrier sense implementation step;
A second carrier sense implementation step of performing carrier sense using the second wireless method;
A second communication step of performing wireless communication with the terminal device using the second wireless method based on a result of performing carrier sense in the second carrier sense implementation step;
When a transmission request for the second wireless method is generated, it waits until a transmission request for the first wireless method is generated, and in response to the transmission request for the first wireless method, the first carrier sense is performed. The operation of the second carrier sense execution step is performed so that the start timing and execution period of the carrier sense according to the execution step coincide with the start timing and execution period of the carrier sense according to the second carrier sense execution step. And a control step for controlling the wireless communication method. A wireless communication method performed by a wireless communication device that performs wireless communication with a terminal device using a plurality of wireless systems that use different frequencies,
A first carrier sense implementation step of performing carrier sense using a first wireless method;
A first communication step of performing wireless communication with the terminal device using the first wireless method based on a result of performing carrier sense in the first carrier sense implementation step;
A second carrier sense implementation step of performing carrier sense using the second wireless method;
A second communication step of performing wireless communication with the terminal device using the second wireless method based on a result of performing carrier sense in the second carrier sense implementation step;
When the transmission request of the second wireless method is generated during the carrier sense in the first carrier sense execution step, the end timing of the carrier sense being executed and the second wireless method And a control step for controlling the operation of the second carrier sense execution step so that the carrier sense end timing in the second carrier sense execution step performed in response to the transmission request matches. Wireless communication method.

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