JP5756397B2 - Wireless communication system and wireless communication method - Google Patents

Description

  The present invention relates to wireless communication technology.

  IEEE 802.11n is known as a wireless LAN (Local Area Network) standard (see Non-Patent Document 1). In this wireless LAN standard, beacons are periodically transmitted and received in a BBS (Basic Service Set) formed by a wireless base station and a wireless terminal device. The beacon is a signal transmitted by the wireless base station, and stores various information necessary for the wireless terminal device to communicate with the wireless base station. Information stored in a beacon in the IEEE 802.11n standard includes information on time synchronization, information on frequency channels, information on power management, information on quality of service (QoS), and the like. The wireless terminal device can establish synchronization with the wireless base station by receiving this beacon.

  Further, IEEE 802.15.4 is known as a WPAN (Wireless Personal Area Network) standard (see Non-Patent Document 2). In the WPAN standard, a super frame obtained by dividing a MAC (Media Access Control) frame into slot units can be used as an optional function. When using a super frame, a beacon is transmitted to a wireless terminal device from a wireless base station (parent node) operating as a router or a coordinator. The beacon in the WPAN standard stores information relating to time synchronization, information relating to the transmission period of the superframe and the beacon, information relating to the slot configuration of the superframe, and the like as information necessary for using the superframe. The wireless terminal device can establish synchronization with the wireless base station (parent node) by receiving the beacon.

  In addition, a flexible wireless system that realizes a wireless communication function by software operating on general-purpose hardware has been proposed. In the flexible wireless system, one radio base station supports a plurality of radio communication schemes, thereby enabling communication with a plurality of radio terminal apparatuses having different radio communication schemes. Patent Document 1 describes a technology in which a wireless gateway device corresponding to a wireless base station appropriately downloads software signal processing used in the wireless gateway device from a program server on a network based on a detected wireless communication method.

JP 2009-231903 A

IEEEStd802.11-2007 (p.419-421) IEEEStd802.15.4-2003 (p.13-28)

In the flexible wireless system, a radio base station (hereinafter referred to as “flexible radio base station”) transmits a beacon corresponding to each radio communication scheme for each radio communication scheme that requires beacon transmission. For this reason, in a wireless communication system that can be supported by the flexible wireless system, as the number of wireless communication systems that require transmission / reception of beacons increases, traffic increases due to transmission of beacons.
In view of the above circumstances, an object of the present invention is to provide a technique for suppressing an increase in traffic required for transmitting a beacon.

  One aspect of the present invention is a communication unit that communicates with a wireless terminal device corresponding to each different wireless communication method, and a traffic amount measurement unit that measures a traffic amount in communication with the wireless terminal device for each wireless communication method And a transmission period determining unit that determines a transmission period of a periodic signal to be transmitted periodically for each wireless communication system based on the measured traffic volume, and for each wireless communication system according to the determined transmission period A periodic signal generating unit that generates the periodic signal and transmits the generated periodic signal by the communication unit.

  One embodiment of the present invention is the above wireless communication system, wherein the transmission cycle determination unit is configured to transmit the periodic signal based on a traffic amount ratio for each of the different wireless communication schemes measured by the traffic amount measurement unit. The transmission cycle is determined.

  One embodiment of the present invention is the above wireless communication system, wherein the traffic amount measurement unit and the transmission cycle determination unit are a flexible wireless base station that performs wireless communication with the wireless terminal device or the flexible wireless base. It is provided in any one of the signal processing devices that are communicably connected to the station via a wired network.

  According to another aspect of the present invention, there is provided a wireless communication method performed by a wireless communication system including a communication unit that performs communication with a wireless terminal device corresponding to different wireless communication methods, and traffic in communication with the wireless terminal device. A traffic amount measuring step for measuring the amount for each wireless communication method, and a transmission period determining step for determining a transmission cycle of a periodic signal to be periodically transmitted for each wireless communication method based on the measured traffic amount And a periodic signal generation step of generating the periodic signal for each wireless communication method according to the determined transmission period and causing the communication unit to transmit the generated periodic signal.

  One aspect of the present invention is the above wireless communication method, wherein the periodic signal is based on a traffic amount ratio for each of the different wireless communication methods measured in the traffic amount measurement step in the transmission cycle determination step. The transmission cycle is determined.

  One embodiment of the present invention is the above wireless communication method, wherein the traffic amount measurement step and the transmission cycle determination step include a flexible wireless base station that performs wireless communication with the wireless terminal device, or the flexible wireless base It is executed by any one of signal processing apparatuses communicably connected to a station via a wired network.

  According to the present invention, it is possible to suppress an increase in traffic required for transmitting a beacon.

It is a figure which shows the system configuration | structure of the flexible wireless system in 1st Embodiment. It is a schematic block diagram which shows the function structure of the flexible radio base station and radio | wireless terminal apparatus in 1st Embodiment. It is a flowchart which shows the flow of the process which the flexible radio base station in 1st Embodiment performs. It is a figure which shows the system configuration | structure of the flexible wireless system in 2nd Embodiment. It is a schematic block diagram which shows the function structure of the flexible radio base station in 2nd Embodiment, a radio | wireless terminal apparatus, and a signal processing apparatus. It is a flowchart which shows the flow of the process which the signal processing apparatus and flexible radio base station in 2nd Embodiment perform.

[First Embodiment]
FIG. 1 is a diagram illustrating a system configuration of a flexible wireless system according to the first embodiment. The flexible wireless system in the first embodiment includes a flexible wireless base station 100 and a plurality of wireless terminal devices 200 (200A-1 to 200A-4, 200B). In FIG. 1, the number of wireless terminal devices 200 is five, but the number of wireless terminal devices 200 is not necessarily limited to five.

  The flexible radio base station 100 performs radio communication with a plurality of radio terminal apparatuses 200 corresponding to a plurality of different radio communication schemes. In order to realize such wireless communication, the flexible wireless base station 100 executes signal processing corresponding to the wireless communication method by operating software on hardware. However, the flexible radio base station 100 does not have to implement all the compatible radio communication systems only with software, and some radio communication systems may execute signal processing with hardware.

  The flexible radio base station 100 in the first embodiment corresponds to two radio communication systems, a first radio communication system and a second radio communication system. Both the first wireless communication method and the second wireless communication method are methods in which wireless communication between both devices is enabled when the wireless terminal device 200 receives the beacon transmitted by the flexible wireless base station 100.

  A specific example of the first wireless communication method is IEEE 802.11n. A specific example of the second communication method is IEEE 802.15.4. In IEEE802.11n, information stored in a beacon includes information on time synchronization, information on frequency channels, information on power management, information on QoS (Quality of Service), and the like. In IEEE802.15.4, a beacon is transmitted when communication using a superframe is executed. Information stored in the beacon in IEEE 802.15.4 includes information related to time synchronization, information related to a superframe and beacon transmission cycle, information related to a superframe slot configuration, and the like.

  The wireless terminal device 200 performs wireless communication with the flexible wireless base station 100. The wireless terminal devices 200A (200A-1 to 200A-4) perform wireless communication corresponding to the first wireless communication method. The wireless terminal device 200B performs wireless communication corresponding to the second wireless communication method. The number of wireless terminal devices 200A need not be limited to four, and the number of wireless terminal devices 200B need not be limited to one.

  The flexible wireless base station 100 transmits a beacon of the first wireless communication method (hereinafter referred to as “first beacon”) and a beacon of the second wireless communication method (hereinafter referred to as “second beacon”) at a predetermined timing. Broadcast transmission. By receiving the first beacon, the wireless terminal device 200A can establish synchronization with the flexible wireless base station 100 and perform wireless communication. By receiving the second beacon, the wireless terminal device 200B can establish synchronization with the flexible wireless base station 100 and perform wireless communication.

  FIG. 2 is a schematic block diagram illustrating functional configurations of the flexible radio base station 100 and the radio terminal device 200 in the first embodiment. In FIG. 2, only one wireless terminal device 200 is illustrated for simplification of the drawing. Note that FIG. 2 shows a configuration corresponding to beacon transmission / reception.

  The flexible wireless base station 100 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, and the like connected by a bus, and executes a flexible wireless base station program. The flexible radio base station 100 functions as a device including the communication unit 101, the traffic amount measurement unit 102, the traffic amount storage unit 103, the transmission cycle determination unit 104, and the beacon generation unit 105 by executing this program. Note that all or some of the functions of the flexible wireless base station 100 may be realized using hardware such as an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA). good. The flexible radio base station program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in the computer system. The program may be transmitted through a telecommunication line.

  The communication unit 101 wirelessly communicates with the wireless terminal device 200 corresponding to a plurality of different wireless communication methods. Specifically, the communication unit 101 performs wireless communication with the wireless terminal device 200A using the first wireless communication method, and performs wireless communication with the wireless terminal device 200B using the second wireless communication method. The function of the communication unit 101 includes, for example, a physical layer corresponding to different wireless communication systems and hardware for RF signal processing, and software for processing such as demodulation corresponding to different wireless communication systems. This is realized by the execution of the CPU.

  The traffic amount measuring unit 102 measures the traffic amount for each wireless communication method based on the result of wireless communication performed by the communication unit 101 with the wireless terminal device 200. Specifically, the traffic amount measuring unit 102 is a traffic amount in wireless communication using the first wireless communication method (hereinafter referred to as “first traffic amount”) and a traffic amount in wireless communication using the second wireless communication method (hereinafter referred to as “first traffic amount”). , “Second traffic amount”).

  The measurement parameter used when the traffic amount measurement unit 102 measures the traffic amount is not particularly limited. For example, the measurement parameter may be a communication frequency for each wireless communication method, or may be the number of wireless terminal devices 200 for which connection is established for each wireless communication method.

  The traffic amount storage unit 103 is configured using a storage device such as a magnetic hard disk device or a semiconductor storage device. The traffic amount storage unit 103 stores the traffic amount measured by the traffic amount measurement unit 102 for each wireless communication method. For example, the traffic volume storage unit 103 stores a first traffic volume and a second traffic volume. When the traffic amount measuring unit 102 newly measures the traffic amount in the wireless communication with the wireless terminal device 200, the traffic amount storage unit 103 has previously stored the newly measured traffic amount. The traffic volume may be rewritten.

  The transmission cycle determination unit 104 determines the beacon transmission cycle for each wireless communication method based on the traffic amount for each wireless communication method stored in the traffic amount storage unit 103. For example, the transmission cycle determination unit 104 determines the beacon transmission cycle of each wireless communication method according to the ratio between the first traffic volume and the second traffic volume.

  Hereinafter, the process of the transmission cycle determination unit 104 will be described more specifically. For example, it is assumed that the ratio of the first traffic volume and the second traffic volume stored in the traffic volume storage unit 103 is 4: 1. In this case, the transmission cycle determining unit 104 defines the transmission cycle of the beacon (in this case, the first beacon) of the wireless communication method (in this case, the first wireless communication method) having the largest ratio in the wireless communication method. It is determined based on the reference transmission cycle. On the other hand, the transmission cycle determination unit 104 determines the beacon of the wireless communication method having the largest ratio (ie, the second beacon in this case) for the transmission cycle of the beacon (in this case, the second beacon). In this case, the transmission cycle of the first beacon is determined based on a longer transmission cycle (in this case, four times longer transmission cycle) according to the ratio. That is, the transmission cycle determination unit 104 determines the beacon transmission cycle for each wireless communication method based on the traffic volume ratio for each wireless communication method.

  The beacon generation unit 105 generates a beacon for each wireless communication scheme according to the transmission cycle for each wireless communication scheme determined by the transmission cycle determination unit 104. Then, the beacon generation unit 105 broadcasts the beacon generated from the communication unit 101. Specifically, it is as follows. The beacon generation unit 105 generates a first beacon according to the transmission cycle of the first beacon determined by the transmission cycle determination unit 104, and broadcasts the first beacon generated from the communication unit 101. The beacon generation unit 105 generates a second beacon according to the transmission cycle of the second beacon determined by the transmission cycle determination unit 104, and broadcasts the second beacon generated from the communication unit 101.

  The wireless terminal device 200 includes a communication unit 201. The communication unit 201 performs wireless communication with the communication unit 101 of the flexible wireless base station 100 by a wireless communication method supported by the own device (wireless terminal device 200). The communication unit 201 receives a beacon of a wireless communication method supported by its own device (wireless terminal device 200) among beacons transmitted from the flexible wireless base station 100, and executes a communication process for establishing synchronization.

FIG. 3 is a flowchart showing a flow of processing executed by the flexible radio base station 100 in the first embodiment. First, the communication unit 101 of the flexible wireless base station 100 performs wireless communication with each of the wireless terminal devices 200 in the cell of the own device (flexible wireless base station 100) (step S101).
The traffic amount measurement unit 102 measures the traffic amount for each wireless communication method based on the communication state of the communication unit 101 (step S102). The traffic amount storage unit 103 stores the measured traffic amount for each wireless communication method (step S103).

The transmission cycle determination unit 104 determines the beacon transmission cycle for each wireless communication method based on the traffic amount for each wireless communication method stored in the traffic amount storage unit 103 (step S104). For example, as described above, the transmission cycle determination unit 104 determines the beacon transmission cycle for each wireless communication method in accordance with the traffic amount ratio for each wireless communication method.
The beacon generation unit 105 generates a beacon for each wireless communication method according to the determined transmission cycle, and broadcasts the beacon generated from the communication unit 101 (step S105).

  As described above, the flexible radio base station 100 according to the first embodiment transmits the beacon of each radio communication scheme at the transmission cycle determined according to the traffic amount for each radio communication scheme. This makes it possible to reduce the frequency of beacon transmission for a wireless communication system with a small amount of traffic. Therefore, in the flexible wireless system, it is possible to suppress an increase in traffic required for beacon transmission. In addition, it is possible to reduce the processing load on the beacon in the flexible radio base station 100 and the radio terminal device 200.

<Modification>
The transmission cycle determination unit 104 described above determines the beacon transmission cycle so as to lower the beacon transmission frequency in the wireless communication system with a small amount of traffic. On the contrary, the transmission cycle determination unit 104 may determine the beacon transmission cycle so as to lower the beacon transmission frequency in a wireless communication scheme with a large amount of traffic. In this case, in a wireless communication system with a large traffic volume, the traffic volume in beacon transmission can be reduced. Therefore, the utilization efficiency of the frequency band used in the radio communication system with a large traffic volume is improved.

  The transmission cycle determination unit 104 described above determines the beacon transmission cycle for each wireless communication method in accordance with the traffic volume ratio. On the other hand, the transmission cycle determination unit 104 may determine the transmission cycle of each beacon based on other than the traffic amount ratio. For example, the transmission cycle determination unit 104 may determine the transmission cycle of each beacon based on a table defined in advance for the traffic amount and the transmission cycle.

In the first embodiment described above, operation is performed corresponding to two wireless communication systems (a first wireless communication system and a second wireless communication system). On the other hand, the flexible wireless system in the present invention may operate corresponding to three or more wireless communication systems.
In the first embodiment described above, the beacon transmission cycle is determined. On the other hand, the transmission period of other types of periodic signals other than beacons that should be periodically transmitted from the flexible radio base station 100 may be determined.

[Second Embodiment]
FIG. 4 is a diagram illustrating a system configuration of the flexible wireless system according to the second embodiment. The flexible wireless system according to the second embodiment includes a plurality of flexible radio base stations 100 (100-1 to 100-3) and a plurality of radio terminal devices 200 (200A-11, 12, 13, 21, 31, 32, 200B- 11, 21, 22, 23, 31, 32), a signal processing device 300, and a wired network 400.
The signal processing device 300 is communicably connected to the three flexible radio base stations 100 (100-1 to 100-3) via the wired network 400.

  Each flexible radio base station 100 is communicably connected to a plurality of radio terminal apparatuses 200 in the cell of each apparatus. In the example of FIG. 4, the flexible radio base station 100-1 includes three radio terminal devices 200A-11, 200A-12, 200A-13 corresponding to the first radio communication scheme, and 1 corresponding to the second radio communication scheme. Are connected to two wireless terminal devices 200B-11. The flexible radio base station 100-2 includes one radio terminal device 200A-21 corresponding to the first radio communication scheme and three radio terminal devices 200B-21, 200B-22, 200B-corresponding to the second radio communication scheme. 23. The flexible radio base station 100-3 includes two radio terminal devices 200A-31 and 200A-32 corresponding to the first radio communication scheme and two radio terminal devices 200B-31 and 200B-corresponding to the second radio communication scheme. 32.

  The flexible radio base station 100 in the second embodiment corresponds to two radio schemes of the first radio communication scheme and the second radio communication scheme, and is transmitted from the radio terminal device 200 in the cell of each flexible radio base station 100. Receive radio waves. The flexible wireless base station 100 converts an input RF signal into a baseband signal by receiving radio waves, and transmits the baseband signal to the signal processing device 300 via the wired network 400.

  The signal processing device 300 stores the baseband signal received from the flexible radio base station 100 in a packet extracted from the demodulated signal, and demodulation processing corresponding to the radio communication scheme (first radio communication scheme and second radio communication scheme). The process according to the data of the application to be executed is executed. Then, the signal processing device 300 generates data of a packet to be transmitted to the wireless terminal device 200, and the packet data is transmitted to the destination flexible wireless base station 100 via the wired network 400 in the baseband signal format. Send to. At this time, the signal processing device 300 generates a baseband signal based on a packet generated according to a format corresponding to the wireless communication scheme of the destination wireless terminal device 200. The flexible radio base station 100 converts the packet data in the baseband signal format received from the signal processing device 300 into an RF signal and transmits the RF signal to the destination radio terminal device 200.

  As described above, in the flexible wireless system according to the second embodiment, the flexible radio base station 100 functions to relay signals transmitted and received between the radio terminal device 200 and the signal processing device 300. The signal processing device 300 performs signal processing on a signal received from the wireless terminal device 200 and signal processing on a signal to be transmitted to the wireless terminal device 200.

  FIG. 5 is a schematic block diagram illustrating functional configurations of the flexible radio base station 100, the radio terminal device 200, and the signal processing device 300 in the second embodiment. In FIG. 5, only one flexible radio base station 100 and one radio terminal device 200 are shown for simplification of the drawing. FIG. 5 shows an extracted configuration corresponding to beacon transmission / reception. Further, in FIG. 5, the same functional units as those in FIG.

  The signal processing device 300 includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus, and executes a signal processing device program. The signal processing device 300 functions as a device including a communication unit 301, a traffic amount measurement unit 302, a traffic amount storage unit 303, and a transmission cycle determination unit 304 by executing this program. All or some of the functions of the signal processing device 300 may be realized using hardware such as an ASIC, PLD, or FPGA. The signal processing device program may be recorded on a computer-readable recording medium. The program may be transmitted through a telecommunication line.

The communication unit 301 communicates with the flexible wireless base station 100 via the wired network 400 corresponding to different wireless communication methods. Thereby, the communication unit 301 can communicate with the wireless terminal device 200 via the flexible wireless base station 100.
The traffic amount measuring unit 302 is based on the result of wireless communication with the wireless terminal device 200 performed by the communication unit 301 via the flexible wireless base station 100, and the traffic amount for each combination of the cell and the wireless communication method of the flexible wireless base station 100. Measure. Taking the system configuration shown in FIG. 4 as an example, the traffic amount measurement unit 302 includes, for each cell of the flexible wireless base stations 100-1, 100-2, 100-3, the first traffic amount in the first wireless communication scheme, The second traffic amount in the second wireless communication system is measured.

  The traffic amount storage unit 303 is configured using a storage device such as a magnetic hard disk device or a semiconductor storage device. The traffic amount storage unit 303 stores the traffic amount measured by the traffic amount measurement unit 302 for each combination of the cell of the flexible radio base station 100 and the radio communication method. When the traffic amount measuring unit 302 newly measures the traffic amount in the wireless communication with the wireless terminal device 200, the traffic amount storage unit 303 stores the newly measured traffic amount so far. The traffic volume may be rewritten.

  Based on the traffic amount for each combination of the cell of the flexible wireless base station 100 and the wireless communication method stored in the traffic amount storage unit 303, the transmission cycle determining unit 304 determines the cell and wireless communication method of the flexible wireless base station 100. The beacon transmission cycle for each combination is determined.

  In the example illustrated in FIG. 4, the transmission cycle determination unit 304 determines the flexible radio base station based on the first traffic amount and the second traffic amount in the cell of the flexible radio base station 100-1 stored in the traffic amount storage unit 303. The transmission period of the first beacon and the transmission period of the second beacon in the cell of the station 100-1 are determined.

  Further, the transmission cycle determination unit 304 determines the flexible radio base station 100-2 based on the first traffic amount and the second traffic amount in the cell of the flexible radio base station 100-2 stored in the traffic amount storage unit 303. The transmission period of the first beacon and the transmission period of the second beacon in the cell are determined.

In addition, the transmission cycle determining unit 304 determines the flexible radio base station 100-3 based on the first traffic amount and the second traffic amount in the cell of the flexible radio base station 100-3 stored in the traffic amount storage unit 303. The transmission period of the first beacon and the transmission period of the second beacon in the cell are determined.
Then, the transmission cycle determination unit 304 notifies each flexible radio base station 100 of the determined transmission cycle of the first beacon and the transmission cycle of the second beacon for each cell of the flexible radio base station 100.

In the example illustrated in FIG. 4, the transmission cycle determination unit 304 notifies the flexible radio base station 100-1 of the transmission cycle of the first beacon and the transmission cycle of the second beacon in the cell of the flexible radio base station 100-1. To do. This notification may be performed by transmitting a transmission cycle notification signal including information on the transmission cycle of each beacon.
In addition, the transmission cycle determination unit 304 notifies the flexible radio base station 100-2 of the transmission cycle of the first beacon and the transmission cycle of the second beacon in the cell of the flexible radio base station 100-2. In addition, the transmission cycle determination unit 304 notifies the flexible radio base station 100-3 of the transmission cycle of the first beacon and the transmission cycle of the second beacon in the cell of the flexible radio base station 100-3.

The flexible radio base station 100 includes a communication unit 101 and a beacon generation unit 105. The communication unit 101 receives the transmission cycle notification signal transmitted from the signal processing device 300 and outputs it to the beacon generation unit 105. The beacon generation unit 105 generates a beacon for each wireless communication scheme according to the transmission cycle for each wireless communication scheme indicated by the transmission cycle notification signal input from the communication unit 101. Then, the beacon generation unit 105 broadcasts the beacon generated from the communication unit 101.
The wireless terminal device 200 includes a communication unit 201. The communication unit 201 receives a beacon of a wireless communication method supported by its own device (wireless terminal device 200) among beacons transmitted from the flexible wireless base station 100, and executes a communication process for establishing synchronization.

Hereinafter, a method for determining a beacon transmission cycle when the traffic amount is measured based on the number of wireless terminal devices 200 corresponding to each wireless communication method based on the system configuration illustrated in FIG. 4 will be described.
The cell of the flexible radio base station 100-1 includes three radio terminal devices 200A-11, 200A-12, 200A-13 corresponding to the first radio communication scheme, and one radio terminal corresponding to the second radio communication scheme. Device 200B-11 is connected. In this case, the traffic amount measurement unit 302 includes three wireless terminal devices 200 corresponding to the first wireless communication method based on the communication state in the communication unit 301, and the wireless terminal device 200 corresponding to the second wireless communication method is It is determined that there is one. Based on this determination result, the traffic amount measuring unit 302 measures that the ratio of the first traffic amount and the second traffic amount is 3: 1. The transmission cycle determination unit 304 determines the transmission cycle of the first beacon and the transmission cycle of the second beacon according to the ratio indicated by the measurement result. For example, the transmission cycle determination unit 304 determines the transmission cycle of the beacon (in this case, the first beacon) of the wireless communication method (in this case, the first wireless communication method) having the largest ratio, in the wireless communication method. It is determined based on the transmission cycle. On the other hand, the transmission cycle determination unit 304 determines the beacon of the wireless communication method having the largest ratio (ie, the second beacon in this case) of the beacon (in this case, the second wireless communication method). The transmission period of the first beacon is determined based on a longer transmission period (in this case, three times longer transmission period) according to the ratio.

  In the cell of the flexible radio base station 100-2, one radio terminal device 200A-21 corresponding to the first radio communication scheme and three radio terminal devices 200B-21, 200B-22 corresponding to the second radio communication scheme are provided. , 200B-23. In this case, the traffic amount measurement unit 302 measures that the ratio of the first traffic amount and the second traffic amount is 1: 3 based on the communication state in the communication unit 301. The transmission cycle determination unit 304 determines the transmission cycle of the first beacon and the transmission cycle of the second beacon according to the ratio indicated by the measurement result. For example, the transmission cycle determination unit 304 determines the transmission cycle of the beacon (in this case, the second beacon) of the wireless communication method (in this case, the second wireless communication method) with the largest ratio, in the wireless communication method. It is determined based on the transmission cycle. On the other hand, the transmission cycle determination unit 304 determines the beacon of the wireless communication method having the largest ratio (ie, the first beacon in this case) for the transmission cycle of the beacon (in this case, the first wireless communication method). The transmission period of the second beacon is determined based on a longer transmission period (in this case, three times longer transmission period) according to the ratio.

  The cell of the flexible radio base station 100-3 includes two radio terminal devices 200A-31 and 200A-32 corresponding to the first radio communication scheme and two radio terminal devices 200B-31 corresponding to the second radio communication scheme. , 200B-32 are connected. In this case, the traffic amount measuring unit 302 measures that the ratio of the first traffic amount and the second traffic amount is 1: 1 based on the communication state in the communication unit 301. In this case, the transmission cycle determination unit 304 may set the transmission cycle of the first beacon and the transmission cycle of the second beacon to be the same. The transmission cycle determination unit 304 may determine the transmission cycle of the first beacon and the transmission cycle of the second beacon based on the reference transmission cycle defined in each wireless communication method.

  FIG. 6 is a flowchart showing a flow of processing executed by the signal processing device 300 and the flexible radio base station 100 in the second embodiment. First, the communication unit 101 of the flexible wireless base station 100 performs wireless communication with each of the wireless terminal devices 200 in the cell of the own device (flexible wireless base station 100) (step S201), and the wireless terminal device 200 in wireless communication. The signal received from is transferred to the signal processing device 300 via the wired network 400 (step S202).

  Next, the communication unit 301 of the signal processing device 300 receives the signal transferred in the process of step S202 (step S301). Based on the communication state of the communication unit 301, the traffic amount measurement unit 302 measures the traffic amount for each combination of the cell of the flexible radio base station 100 and the radio communication method (step S302). The traffic amount storage unit 303 stores the measured traffic amount for each combination of the cell of the flexible wireless base station 100 and the wireless communication method (step S303).

The transmission cycle determination unit 304 determines the cell of the flexible radio base station 100 and the radio communication based on the traffic amount ratio for each combination of the cell of the flexible radio base station 100 and the radio communication method stored in the traffic amount storage unit 303. A beacon transmission cycle is determined for each combination of methods (step S304).
The transmission cycle determination unit 304 notifies the flexible radio base station 100 of each cell of the beacon transmission cycle for each radio communication scheme in each cell of the flexible radio base station 100 (step S305). This notification is performed by transmitting a transmission cycle notification signal.

  The communication unit 101 of the flexible radio base station 100 receives the transmission cycle notification signal transmitted in step S305 (step S203). The beacon generation unit 105 generates a beacon for each wireless communication method according to the transmission cycle for each wireless communication method indicated by the received transmission cycle notification signal, and broadcasts the beacon generated from the communication unit 101 (step S204). ).

<Modification>
In FIG. 4, the number of wireless terminal devices 200 that wirelessly communicate with one flexible wireless base station 100 is four, but may be one, or may be a plurality other than four. Further, the number of wireless terminal devices 200 that wirelessly communicate with one flexible wireless base station 100 may be different for each flexible wireless base station 100. Further, the number of flexible radio base stations 100 need not be limited to three, and may be one, or may be a plurality other than three.

In the second embodiment, the flexible radio base station 100 includes a beacon generation unit 105 to generate a beacon. On the other hand, for example, the signal processing apparatus 300 may be configured so that the specifications of each flexible radio base station 100 can be recognized, and the signal processing apparatus 300 may have a function of generating a beacon.
The second embodiment may be modified in the same manner as the modification of the first embodiment.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Flexible wireless base station, 101 ... Communication part, 102 ... Traffic amount measurement part, 103 ... Traffic amount storage part, 104 ... Transmission period determination part, 105 ... Beacon generation part, 200 ... Wireless terminal device, 201 ... Communication part, DESCRIPTION OF SYMBOLS 300 ... Signal processing apparatus, 301 ... Communication part, 302 ... Traffic amount measurement part, 303 ... Traffic amount memory | storage part, 304 ... Transmission period determination part, 400 ... Wired network

Claims (6)

A communication unit for communicating with a wireless terminal device corresponding to each different wireless communication method;
A traffic amount measuring unit that measures a traffic amount in communication with the wireless terminal device for each wireless communication method;
A transmission period determining unit that determines a transmission period of a periodic signal to be transmitted periodically for each of the wireless communication schemes based on the measured traffic volume;
A periodic signal generating unit that generates the periodic signal for each of the wireless communication schemes according to the determined transmission period, and causes the communication unit to transmit the generated periodic signal ;
The transmission cycle determination unit determines the transmission cycle so that the transmission frequency of the periodic signal is low for a wireless communication scheme with a small amount of traffic.
Wireless communication system. The transmission cycle determination unit
The wireless communication system according to claim 1, wherein a transmission period of the periodic signal is determined based on a traffic amount ratio for each of the different wireless communication methods measured by the traffic amount measurement unit. The traffic amount measuring unit and the transmission cycle determining unit are
The flexible wireless base station that performs wireless communication with the wireless terminal device or the signal processing device that is communicably connected to the flexible wireless base station via a wired network is provided. The wireless communication system according to 1 or 2. A wireless communication method performed by a wireless communication system including a communication unit that communicates with a wireless terminal device corresponding to different wireless communication methods,
A traffic amount measuring step for measuring a traffic amount in communication with the wireless terminal device for each wireless communication method;
A transmission period determining step for determining a transmission period of a periodic signal to be periodically transmitted for each wireless communication method based on the measured traffic volume;
Wherein according to the determined transmission period to generate said periodic signal for each wireless communication system, the generated the periodic signal possess a periodic signal generating step of transmitting by the communication unit,
In the transmission cycle determination step, the transmission cycle is determined so that the transmission frequency of the periodic signal is low for a wireless communication scheme with a small amount of traffic.
Wireless communication method. In the transmission cycle determination step,
The wireless communication method according to claim 4, wherein a transmission period of the periodic signal is determined based on a traffic amount ratio for each of the different wireless communication methods measured in the traffic amount measurement step. The traffic volume measuring step and the transmission cycle determining step include
It is executed by either a flexible radio base station that performs radio communication with the radio terminal device or a signal processing device that is communicably connected to the flexible radio base station via a wired network. Item 6. The wireless communication method according to Item 4 or 5.

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