WO2012032780A1

WO2012032780A1 - Wireless device and communication method

Info

Publication number: WO2012032780A1
Application number: PCT/JP2011/005050
Authority: WO
Inventors: チェンスン; 洲藍; チンシャンサム; 俊義王; ハグエンチャン; ヨハネスアレムスグドデメシ; 博司原田
Original assignee: 独立行政法人情報通信研究機構
Priority date: 2010-09-09
Filing date: 2011-09-08
Publication date: 2012-03-15
Also published as: JP2012060453A; JP5729629B2

Abstract

Provided are a wireless device and communication method capable of suppressing crosstalk in wireless devices sharing a frequency band. A wireless device related to the embodiment is a wireless device belonging to a second wireless system different from a first wireless system such that a frequency band that is used overlaps with the first wireless system, wherein the wireless device is equipped with: a transmission and reception unit for communicating with another wireless device belonging to the second wireless system; a request transmission unit which generates request information containing information indicating a frequency belonging to a frequency band used by the first wireless system for which usage is sought and location information of the wireless device, and which transmits the request information to a master device which manages information indicating the frequency and location of the wireless device belonging to the first wireless system so that the information can be searched; a response reception unit which receives frequency enablement information indicating a frequency belonging to the frequency band used by the first wireless system for which the master device has enabled usage on the basis of the request information; a detection unit for detecting the presence or absence of radio waves of the wireless device belonging to the first wireless system in the frequency for which usage has been enabled, on the basis of the frequency enablement information; and a transmission control unit which starts transmission for the transmission and reception unit in the frequency for which the usage has been enabled if the detection unit does not detect radio waves of the wireless device belonging to the first wireless system.

Description

Wireless device and communication method

The present invention relates to a radio apparatus and a communication method for preventing interference in a radio system sharing a frequency band in advance.

Wireless LAN (WLAN) is the system that works best in the Industrial Science and Medical Band (ISM Band: Industry-Science-Medical). Products related to 802.11 are widely spread and form a large market. However, due to the increase in ISM band usage, WLAN resources lack frequency resources that can achieve high throughput.

Therefore, it is considered to operate a wireless device such as a WLAN that does not require a license in a frequency band licensed for a specific use, such as a radar band (3650-3700 MHz). In particular, regarding an unused channel (unused frequency) in the TV band known as TV white space (TVWS), specific studies are being made regarding restrictions on the use of the frequency that does not require a license. It is expected that WLAN will be able to operate in the band.

By the way, when sharing a frequency band used by a wireless device that does not require a license and a licensed wireless device, the wireless device that does not require a license has been licensed because the priority for using the frequency band is low. Do not give radio equipment interference. However, since a licensed wireless device and a wireless device that does not require a license have different communication procedures and specifications, interference occurs when the frequency bands to be used overlap.

As described above, the conventional radio apparatus and communication method have a problem in that interference may occur between radio systems sharing a frequency band (particularly, radio systems having higher priority than self). An embodiment of the present invention has been made to solve such a problem, and an object of the present invention is to provide a radio apparatus and a communication method capable of suppressing interference in radio apparatuses sharing a frequency band.

In order to solve the above-described problem, a wireless device according to an embodiment is a wireless device belonging to a second wireless system different from the first wireless system in which a frequency band to be used overlaps with the first wireless system. A transmitter / receiver that communicates with another wireless device belonging to the second wireless system, and a request information including information indicating a frequency to be used belonging to a frequency band used by the first wireless system and position information of itself. A request transmission unit that transmits request information to a master device that manages information indicating the frequency and position of a wireless device that belongs to the first wireless system, and a request that belongs to a frequency band used by the first wireless system A response receiving unit that receives frequency permission information indicating a frequency that the master device is permitted to use based on the information, and a frequency that is permitted to be used based on the frequency permission information. A detecting unit for detecting presence / absence of radio waves of a wireless device belonging to the wireless system, and transmission of the transmitting / receiving unit at a frequency permitted to be used when the detecting unit does not detect radio waves of the wireless device belonging to the first wireless system. And a transmission control unit to be started.

Embodiment of this invention aims at providing the radio | wireless apparatus and communication method which can suppress interference in the radio | wireless apparatus which shares a frequency band.

It is a block diagram which shows the structure of the radio | wireless system of 1st Embodiment. It is a figure which shows the element of the information used with the radio | wireless system of 1st Embodiment. It is a figure which shows the specific example of the element of the information used with the radio | wireless system of 1st Embodiment. It is a figure which shows the specific example of an action value among the elements of the information shown to FIG. 3A. It is a figure which shows the specific example of the element of the information used with the radio | wireless system of 1st Embodiment. It is a figure which shows the specific example of information ID among the elements of the information shown to FIG. 4A. It is a flowchart which shows operation | movement of the radio | wireless system of 1st Embodiment. It is a conceptual diagram which shows the specific example of the radio | wireless system of 1st Embodiment. It is a conceptual diagram which shows the specific example of the radio | wireless system of 1st Embodiment. It is a conceptual diagram which shows the specific example of the radio | wireless system of 1st Embodiment. It is a conceptual diagram which shows the specific example of the radio | wireless system of 1st Embodiment. It is a conceptual diagram which shows the specific example of the radio | wireless system of 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless system of 2nd Embodiment. It is a conceptual diagram which shows the specific example of the radio | wireless system of 2nd Embodiment. It is a conceptual diagram which shows the modification of the radio | wireless system of 2nd Embodiment. It is a flowchart which shows operation | movement of the radio | wireless system of 2nd Embodiment.

(First Embodiment) Hereinafter, a radio apparatus according to an embodiment will be described in detail with reference to the drawings. As shown in FIG. 1, the wireless system of this embodiment includes a master device 1 that performs an empty channel determination, an access point (AP) device 2 that performs communication on a channel permitted by the master device 1, and a STA that communicates with an AP device 2. A device 3 is included.

In FIG. 1, the primary system PS is a wireless device that is licensed in a specific channel of a predetermined frequency band and has a higher priority than other wireless stations in using the channel. The primary system PS corresponds to, for example, a radio device of a television broadcasting station licensed to use a specific channel in a television band. The master device 1 is a wireless device that selects a channel (frequency) that can be used by a subordinate AP device 2 without causing any interference to the primary system PS among frequency bands used by the primary system PS. The AP device 2 is a wireless device that can communicate using a frequency in a frequency band used by the primary system PS. The AP device 2 can communicate with the STA device 3.

The AP device 2 of this embodiment functions as an access point that wirelessly communicates with the STA device 3, and is configured to be able to use frequencies in the frequency band overlapping with the primary system PS. The primary system PS has a higher priority for using the frequency band than the AP device 2 and the STA device 3 (and also the master device 1), and the master device 1, the AP device 2, and the STA device 3 have a higher priority than the primary system PS. Therefore, it should not cause interference. In the example described below, the primary system PS is a wireless device licensed for a specific channel of a television broadcast band, and the master device 1, the AP device 2, and the STA device 3 are wireless LANs with limited coverage. The description will be made assuming that the wireless device can function as a system (WLAN). A frequency band defined by the center frequency and the frequency bandwidth and assigned to the primary system PS and used by the WLAN device for communication is referred to as a “network channel”.

As shown in FIG. 1, the master device 1 according to this embodiment includes a receiving unit 12, a transmitting unit 13, and an interface unit (I / F) 14. The receiving unit 12 receives a radio wave transmitted from a communication partner via the antenna 11 and demodulates it by a predetermined method. The transmission unit 13 modulates information for the communication partner to generate a radio signal, and transmits the wireless signal to the communication partner via the antenna 11. The I / F 14 connects the receiving unit 12 and the transmitting unit 13 to a network (NW) 15 such as the Internet.

The receiving unit 12 receives the radio wave from the communication partner via the antenna 11, demodulates it by a predetermined method, and sends it to the NW 15 via the I / F 14. On the other hand, information from the NW 15 is sent to the transmission unit 13 via the I / F 14, and the transmission unit 13 converts the information into a radio signal and transmits it to the communication partner via the antenna 11. That is, the reception unit 12, the transmission unit 13, and the I / F 14 function as a WLAN access point that accommodates a communication partner as a client. The reception unit 12 and the transmission unit 13 can be realized by using a system compliant with the IEEE 802.11 standard, for example. Note that the frequency band used by the receiving unit 12 and the transmitting unit 13 is at least partially overlapped with the frequency band used by the primary system PS.

Further, the master device 1 includes a request analysis unit 16, an interference determination unit 17, and a response generation unit 18. The request analysis unit 16 analyzes the content of the frequency allocation request sent from the AP device 2. Based on the request content of the AP device 2 analyzed by the request analysis unit 16, the interference determination unit 17 accesses the database DB connected to the NW 15 via the I / F 14 and determines whether the request content can be permitted. That is, the interference determination unit 17 determines whether the request content from the AP device 2 can give interference to the primary system PS. The response generation unit 18 generates response information to the AP device 2 based on the determination result of the interference determination unit 17 and transmits the response information to the AP device 2 via the transmission unit 13.

The AP device 2 of this embodiment includes a receiving unit 22, a transmitting unit 23, and an I / F 24. The reception unit 22, the transmission unit 23, and the I / F 24 in the AP device 2 have functions common to the reception unit 12, the transmission unit 13, and the I / F 14 in the master device 1. The I / F 24 is connected to a network (NW) 25 such as the Internet. However, the NW 25 may be a network common to the NW 15 or a different network.

In addition, the AP apparatus 2 includes a transmission control unit 26, a request generation unit 27, a response analysis unit 28, and a service detection unit 29. The transmission control unit 26 controls transmission of the transmission unit 23 and controls transmission frequency, transmission power, and the like. The request generation unit 27 selects a channel and transmission power used by the AP device 2 and the STA device 3 under the AP device 2 and generates request information, and transmits the request information to the master device 1 via the transmission unit 23. The response analysis unit 28 analyzes the content of the response information obtained as a result of transmitting the request information to the master device 1. The transmission control unit 26 determines the usage channel and transmission power of the AP device 2 based on the contents of the analyzed response information, and controls the transmission unit 23. The service detection unit 29 monitors the radio wave of the primary system PS via the reception unit 22 and detects whether the service of the primary system PS has been started (or has been started). The transmission control unit 26 performs transmission stop control based on the detection result.

The STA device 3 is a wireless device that constitutes a WLAN with the AP device 2. The STA device 3 has a common configuration with the AP device 2.

The database DB stores position information, frequency information, transmission power information and other PS basic information of the primary system PS. The database DB has a function of acquiring basic information of the corresponding primary system PS from the PS basic information group in response to a query from the master device 1 and returning the basic information to the master device 1. In the example illustrated in FIG. 1, the database DB and the master device 1 are connected via the network 15, but the present invention is not limited to this. The database DB may be constructed in a storage device provided in the master device 1 or the like. The registered contents of the database DB are updated as needed by the authorized system owner of the primary system PS.

(Request information and response information) Here, the request information issued by the AP device 2 and the response information issued by the master device 1 will be described with reference to FIGS. 2, 3A, 3B, 4A, and 4B.

Prior to using a network channel belonging to the frequency band of the primary system PS, the AP device 2 sends request information to the master device 1, and the use of the network channel at the location of the AP device 2 and its surroundings interferes with the primary system PS. Inquire whether or not to give. As shown in FIG. 2, the AP device 2 of this embodiment includes a requester address (RequesterRequestSTA address), a responder address (Responder STA address), a data length (Length), a reason / result code (ReasonaResult code), Network Channel Permission ID (Network Channel Enablement Identifier), Number of Network Channel Control Groups (Number of Network Channel Control Control triplets), Operation Class (Operating Class), Channel Number (Channel Number), and Maximum Transmission Power (Maximum Transmit Power) To the master device 1 as request information. Similarly, the master device 1 issues response information according to the request information from the AP device 2. The response information has the same elements as the request information. The requester address, the responder address, the data length, the reason / result code, the network channel permission ID, the number of network channel control groups, the operation class, the channel number, and the maximum The transmission power is included as an element.

The requester address is the address of the AP device 2 that is the requester who starts this procedure. For example, it is a logical address such as the MAC address of the AP device 2 or physical location information. The responder address is the address of the master device 1 that gives the channel permission. Similar to the requester address, the responder address is a logical address such as the MAC address of the master device 1 or physical location information. The data length is the total frame length constituting the request information.

The reason / result code defines whether or not the requested network channel can be used as a result of the master device 1 searching the database DB based on the request information, and if not, the reason. The network channel permission ID is an ID assigned from the master device 1 to the AP device 2. The number of network channel control pairs is the number of arrangements of the operation class / channel number and the maximum transmission power (the number of repetitions repeatedly arranged for each network channel of the operating STA). The operation class is a set of network channels that the AP apparatus 2 seeks to use, and the channel number is the number of the corresponding channel. The operation class and channel number specify a channel frequency and a frequency bandwidth for determining whether or not the network channel is available. Examples of operational classes include those shown in Appendix J of IEEE 802.11af, which is a draft standard. When the channel number is included in the request information, it is the channel number of the network channel that requests use, and when it is included in the response information, it means the channel number of the network channel that is permitted to be used. The maximum transmission power is the maximum transmission power for requesting use when included in the request information, and the transmission power permitted to be used when included in the response information. However, there is no need to have information on the maximum transmission power.

FIG. 3A and FIG. 3B show an example of a frame configuration when request information and response information are transmitted using a public action frame (Public Action Frame) defined by IEEE 802.11. As shown in FIG. 3A, when transmitting request information and response information using a public action frame, for example, category, action value, requester address, responder address, data length, reason / result code, network channel permission ID The number of network channel control sets, the operation class, the channel number, and the maximum transmission power can be included as elements.

Among the elements of the request information and the response information shown in FIG. 3A, the category is defined by 1 octet as a value corresponding to the public action specified in Table 7-24 in IEEE 802.11-2007. As the action value, a value corresponding to each function defined in the table shown in FIG. 3B is defined by 1 octet. In the example of this embodiment, “9” corresponding to “enable network channel” is set as the action value. In the reason / request code, the reason why the response information is generated is defined by 1 octet. This code is specified in Table 7-57f1 in IEEE802.11y-2008.

Requester address and responder address are each defined in 6 octets. The network channel permission ID is assigned a 16-bit number. The maximum transmission power is defined in units of [dBm] for transmission power for TV band operation.

On the other hand, the network channel enabling element shown in FIG. 2 can also be transmitted using a protocol. FIG. 4A and FIG. 4B show registered location query protocol elements (RLQP) when request information and response information are transmitted using the GAS protocol (Generic Advertisement Service protocol). It is an example. As shown in FIG. 4A, when request information and response information are transmitted by RLQP of GAS protocol, information ID, requester address, responder address, data length, reason / result code, network channel permission ID, network channel control set Number, operational class, channel number, and maximum transmit power can be included as elements. Among these elements, the information ID is defined by 1 octet of the information ID corresponding to the information name defined in the table shown in FIG. 4B. In the example shown in FIGS. 4A and 4B, “3” corresponding to “network channel enablement” is set as the information ID.
As described above, the request information and the response information include information useful for determining the presence or absence of interference.

(Operation of First Embodiment) Next, the operation of the wireless system according to the first embodiment will be described with reference to FIG. 1 to FIG.

When the AP device 2 (and the STA device 3) uses a network channel belonging to the frequency band assigned to the primary system PS, the request generation unit 27 includes one or more sets of necessary operation class, channel number, and maximum transmission power. Request information is set and a request frame is generated (step 101; hereinafter referred to as “S101”). For example, as shown in FIG. 3A, the category has a predetermined value, the action value is “9”, the requester address is the MAC address of the AP device 2, the responder address is the MAC address of the master device 1, and the data length is a predetermined value. The reason / result code and the network channel permission ID are blank, the number of network channel control groups is “1”, the operation class is a predetermined class, the channel number is 1 to 3, and the maximum transmission power is 100 [mW]. A request frame in which a parameter such as dBm] is defined is generated. The request information can be generated based on a request on the application, a request on the hardware of the AP device 2, a channel measurement result by the service detection unit, and the like.

When the request frame is generated, the transmission unit 23 modulates the request frame and transmits it to the master device 1 via the antenna 21 (S102).

When the reception unit 12 of the master device 1 receives the request frame from the AP device 2 (S103), the request analysis unit 16 analyzes the request frame and extracts request information (S104).

When the request information is extracted, the interference determination unit 17 uses the AP in the area where the AP device 2 is located based on at least one of the address of the AP device 2 and the geographical position information of the master device 1 itself included in the request information. A query requesting the database DB to search for a possible network channel is generated (S105). It is assumed that the geographical position information of the AP device 2 can be obtained by searching or the like from the MAC address of the AP device 2, the installer information of the AP device 2, or the like.

When the query is generated, the interference determination unit 17 issues the query to the database DB via the I / F 14 (S106).

When the query is received (S107), the database DB analyzes the contents of the query (S108), and a list of primary systems PS that may cause interference based on the geographical position information of at least one of the master device 1 and the AP device 2. And a channel list of network channels that can be used by the AP apparatus 2 is generated based on the list. The database DB returns the generated channel list to the master device 1 (S110). Here, the channel list sent from the database DB to the master device 1 includes at least one of a list of primary systems PS that can give interference and a list of network channels that can be used by the AP device 2.

Upon receiving the channel list, the interference determination unit 17 compares the channel list with the request information, and generates an allowed channel list in which channels available to the AP device 2 are extracted from the channels requested by the AP device 2 ( S111). That is, since the channel list includes at least one of a list of primary systems PS that can cause interference and a list of network channels that can be used by the AP device 2, this list and the network channel requested by the AP device 2 are included. By comparing with the above information, it is possible to obtain a network channel that does not cause interference problems.

When the permitted channel list is generated, the interference determining unit 17 generates response information as shown in FIG. 3A based on the permitted operation class, channel number, and maximum transmission power, and the response generating unit 18 is based on the response information. A response frame is generated (S112). The transmission unit 13 transmits the generated response frame to the AP device 2.

When the receiving unit 22 receives the response frame (S113), the response analyzing unit 28 analyzes the response frame and extracts response information (S114). The retrieved response information is sent to the transmission control unit 26.

Upon obtaining the response information, the transmission control unit 26 sets the network channel (transmission frequency) and transmission power of the transmission unit 23 based on the permitted operation class, channel number, and maximum transmission power described in the response information (S115). ). As a result, the transmission unit 23 is ready for transmission.

When the transmission preparation is completed, the service detection unit 29 controls the reception unit 22 to check whether the radio wave of the primary system PS can be received (S116). When the receiving unit 22 receives the radio wave of the primary system PS (Yes in S117), the set network channel cannot be used. Therefore, the transmission control unit 26 does not include the permitted network channel described in the response information. To select another channel number and transmission power, and reset the transmission frequency and transmission power of the transmission unit 23 (S115).

When the reception unit 22 has not received the radio wave of the primary system PS (No in S117), the transmission control unit 26 issues a transmission permission to the transmission unit 23. The transmission unit 23 starts communication with the STA device 3 using the set operation class, channel number, and transmission power (S118). During communication, the transmission unit 23 transfers the response frame (or permitted channel list) received from the master device 1 to the STA device 3, and performs network channel setting and radio wave detection based on the transferred information. Also good. The STA device 3 may directly receive the response frame (or permitted channel list) from the master device 1 and perform channel setting and radio wave detection by itself.

The service detection unit 29 controls the reception unit 22 at a predetermined timing to monitor whether the radio wave of the primary system PS can be received (S119). While the radio wave of the primary system PS cannot be received (No in S119), the transmission unit 23 continues communication under the same conditions.

When the receiving unit 22 receives the radio wave of the primary system PS (Yes in S119), the transmission control unit 26 selects another channel number and transmission power from the permitted channels described in the response information and transmits the selected channel. The transmission frequency and transmission power of the unit 23 are reset (S115). Thereafter, this operation is repeated.

6 to 10 are conceptual diagrams showing specific examples of the wireless system according to the first embodiment. FIG. 6 shows an example in which the master device 1 is configured by a fixed wireless device, and the AP device 2 is configured by an access point device configuring a WLAN. When the AP device 2 sends a request frame to the master device 1 (S102), the master device 1 sends a query to the database DB (S106), and the database DB returns a channel list to the master device 1 (S110). Thereafter, the master device 1 sends a response frame to the AP device 2 (S112). The response frame is transferred to the STA device 3 as appropriate. Alternatively, the STA device 3 may receive a response frame directly from the master device 1. FIG. 7 shows an example in which the master apparatus 1 is configured by an STA apparatus having a function as a master apparatus, and the AP apparatus 2 is configured by an access point apparatus configuring a WLAN, as in the example illustrated in FIG. ing. As shown in FIGS. 6 to 10, 12 and 13, the communication between the master device 1 and the database DB may be realized via a wired network or via a wireless network. Also good.

8 and 9 show an example in which the AP device 2 in the first embodiment does not have the STA device 3 under its control, and the AP devices 2 configure a WLAN in an ad hoc manner. In the example illustrated in FIG. 8, the master device 1 is configured by a fixed wireless device, and in the example illustrated in FIG. 9, the master device 1 is configured by an STA device having a function as a master device.

FIG. 10 shows an example in which the AP device 2 _AP functioning as an access point and the STA device 2 _CL belonging to the AP device 2 _AP both obtain the permitted channel list directly from the master device 1.

That is, in the wireless system of this embodiment, a master device that issues a permitted channel list based on PS basic information and request information of the primary system PS, and a STA device that sets a network channel to be used based on the permitted channel list, Therefore, it is possible to exclude network channels, transmission power, and the like that can interfere with the primary system PS from setting candidates. Since the PS basic information is information updated by the authorized system owner of the primary system PS, it becomes possible to prevent interference in advance. In particular, the primary system PS is not a system that uniformly uses the entire frequency band assigned like radar, but is used in a certain band (channel) unit among frequency bands assigned like television broadcasting. It is effective in the system and can realize fine interference prevention.

Further, the AP device 2 (and the STA device 3) of this embodiment includes a service detection unit, monitors whether the primary system PS receives radio waves, and determines whether or not transmission is possible along with the permitted channel list of response information. As a result, interference can be prevented more reliably.

In the above embodiment, the master device 1 sends geographical location information to the database DB, and the database DB generates a usable channel list from the frequency band of the primary system PS based on the location information. This is not a limitation. The master apparatus 1 may be configured to send the transmission power information included in the request information in addition to the geographical position information, and the database DB may generate the channel list based on the geographical position information and the transmission power information. . Alternatively, the master device 1 may be configured to generate the permitted channel list based on the channel list sent from the database DB and the transmission power information included in the request information. Further, the permitted channel list may be determined based on the possibility of interference with the primary system PS that is the licensed user, the channel management capacity of the master device 1, and the like.

In the above embodiment, the master device 1 does not perform the service detection operation, but may include a service detection unit similar to the AP device 2. That is, the master device 1 may be configured to be able to emit radio waves after confirming that the response information and the radio waves of the primary system PS are not emitted before emitting radio waves.

As described above, in the wireless system of this embodiment, the AP device uses the channel after confirming with the master device an available channel from the frequency band of the primary system PS. The possibility of giving can be lowered.

(Second Embodiment) Next, a radio system according to the second embodiment will be described with reference to FIG. 11, FIG. 12, and FIG. The wireless system of this embodiment is configured such that the master device 1 in the first embodiment has the function of a WLAN access point AP, and the AP device 2 also has the function of a WLAN client. In the following description, functional configurations and operations that are common to the first embodiment are denoted by common reference numerals, and redundant descriptions are omitted.

As shown in FIGS. 11 and 12, the wireless system of this embodiment includes a master device 1a that functions as an access point, and a STA device 2a that functions as a client that constitutes a WLAN under the control of the master device 1a. . In the wireless system of this embodiment, without waiting for a request frame from the STA device 2a as a client, the master device 1a as an access point itself generates request information and issues a query.

The master device 1a of this embodiment includes a receiving unit 12, a transmitting unit 13, an I / F 14, and an interference determining unit 17, and these elements are common to the first embodiment. The master device 1a includes a request generation unit 16a and a permission generation unit 18a. The request generation unit 16a corresponds to the request generation unit 27 in the first embodiment, and the request generation unit 27 selects request information by selecting a network channel and transmission power used by the master device 1a and the subordinate STA device 2a. Generate. The permission generation unit 18 a corresponds to the response generation unit 18 in the first embodiment, generates permission information for the STA device 2 a based on the determination result of the interference determination unit 17, and sends the client device 2 a via the transmission unit 13. Send to. Here, the permission information corresponds to the response information in the first embodiment.

On the other hand, the STA device 2a of this embodiment includes a reception unit 22, a transmission unit 23, an I / F 24, a transmission control unit 26, a request generation unit 27, and a service detection unit 29. These components are common to the AP apparatus 2 in the first embodiment. Furthermore, the STA device 2a has a permission analysis unit 28a. The permission analysis unit 28a corresponds to the response analysis unit 28 in the first embodiment, and analyzes the content of the permission frame sent from the master device 1a.

(Operation of Second Embodiment) Next, the operation of the wireless system of this embodiment will be described with reference to FIG. As shown in FIG. 14, in the wireless system of this embodiment, after the master device 1a generates request information and issues a query and obtains a channel list indicating network channels that do not interfere with the primary system PS, The permitted channel list is transferred as permission information to the subordinate STA apparatus 2a.

When the master device 1a (and the STA device 2a) as an access point uses a network channel belonging to the frequency band assigned to the primary system PS, the request generation unit 16a obtains a necessary operation class, channel number, and maximum transmission power. Request information including one or more sets is set (S201). At this time, the request information can be set along the frame format shown in FIG. 3A.

When the request information is generated, the interference determination unit 17 searches the database for available network channels in the area where the master device 1a and the subordinate STA device 2a are located based on the geographical position information of the master device 1a itself. A query requested to the DB is generated (S105).

When the query is generated, the interference determination unit 17 issues the query to the database DB via the I / F 14 (S106). Thereafter, the database DB performs a search process based on the query, and is common to steps 107 to 110 in the first embodiment until the channel list is returned (S107 to S110).

Upon receipt of the channel list, the interference determination unit 17 compares the channel list with the request information, and permits the channel that can be used by the master device 1a and the subordinate STA device 2a from the request information channels generated by itself. A channel list is generated (S111).

When the permitted channel list is generated, the interference determination unit 17 generates permission information as illustrated in FIG. 3A based on the permitted operation class, channel number, and maximum transmission power, and the permission generation unit 18a performs based on the permission information. To generate a permission frame (S212). The transmission unit 13 transmits the generated permission frame to the STA device 2a.

When the receiving unit 22 receives the permission frame (S213), the permission analysis unit 28a analyzes the permission frame and extracts permission information (S214). The extracted permission information is sent to the transmission control unit 26.

Upon obtaining the permission information, the transmission control unit 26 sets the network channel (transmission frequency) and transmission power of the transmission unit 23 based on the permitted operation class, channel number, and maximum transmission power described in the permission information ( S115). As a result, the transmission unit 23 is ready for transmission. Thereafter, steps such as radio wave detection and communication start control of the primary system PS are common to steps 116 to S119 in the first embodiment.

In the examples shown in FIGS. 11, 12, and 14, the master device 1a does not perform the service detection operation. However, when the radio wave is emitted as an access point, the master device 1a includes a service detection unit as in the STA device 2a. May be. That is, the master device 1a may be configured to be able to emit radio waves after confirming that the permission information and the radio waves of the primary system PS are not emitted before emitting radio waves. Thereby, the possibility of giving interference to the primary system PS can be reduced.

Thus, according to the wireless system of this embodiment, the master device that issues permission for the network channel to be used from the frequency band assigned to the primary system PS also functions as a WLAN access point. Therefore, the master device 1a as an access point can obtain the permission of the network channel used by the whole WLAN as a representative. This contributes to simplifying the communication sequence and suppressing communication traffic.

(Modification of Second Embodiment) Next, a radio system according to the third embodiment will be described with reference to FIG. 11, FIG. 13, and FIG. The wireless system of this embodiment is configured by separating the master device 1a in the second embodiment into an access point AP having an access point function and a calculation unit PC that obtains a channel list from a database DB and generates permission information. The basic operation is the same as that of the second embodiment.

According to the wireless system of this modification, the configuration of the master device 1a can be made flexible. For example, the access point AP and the computing unit PC can be installed at geographically separated locations.

Note that the present invention is not limited to the above embodiment and its operation example. The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Master apparatus, 11 ... Antenna, 12 ... Reception part, 13 ... Transmission part, 14 ... Interface part, 15 ... Network, 16 ... Request analysis part, 17 ... Interference determination part, 18 ... Response generation part, 2 ... AP apparatus , 21 ... antenna, 22 ... receiving unit, 23 ... transmitting unit, 24 ... interface unit, 25 ... network, 26 ... transmission control unit, 27 ... request generating unit, 28 ... response analyzing unit, 29 ... service detecting unit, 3 ... STA device, PS ... primary system, DB ... database.

Claims

A wireless device belonging to a second wireless system different from the first wireless system in which a frequency band to be used overlaps with the first wireless system;
A transceiver for communicating with other wireless devices belonging to the second wireless system;
Information indicating the frequency and position of a wireless device belonging to the first wireless system by generating request information including information indicating a frequency to be used and requesting the use of the first wireless system and information indicating its own position. A request transmission unit that sends the request information to the master device that manages the searchable search,
A response receiving unit that receives frequency permission information indicating a frequency belonging to a frequency band used by the first wireless system and permitted to be used by the master device based on the request information;
A detection unit for detecting presence or absence of radio waves of a wireless device belonging to the first wireless system at a frequency permitted to be used based on the frequency permission information;
A transmission control unit for starting transmission of the transmission / reception unit at a frequency permitted to be used when the detection unit does not detect radio waves of the wireless device belonging to the first wireless system;
A wireless device comprising:
A wireless device belonging to a second wireless system different from the first wireless system in which a frequency band to be used overlaps with the first wireless system;
A transceiver for communicating with other wireless devices belonging to the second wireless system;
Information indicating the frequency and position of a wireless device belonging to the first wireless system by generating request information including information indicating a frequency to be used and requesting the use of the first wireless system and information indicating its own position. A request transmission unit that transmits the request information to a database that manages the searchable search, and
A permission receiving unit that receives the frequency permission information indicating the frequency that is generated by the database based on the request information and that does not interfere with the wireless device that belongs to the first wireless system, among the frequencies to be used;
A wireless device comprising: a transfer unit configured to transfer the frequency permission information received by the permission receiving unit to another wireless device belonging to the second wireless system.
The wireless device according to claim 1, further comprising a transfer unit that transfers the frequency permission information received by the response receiving unit to another wireless device belonging to the second wireless system.
3. The radio apparatus according to claim 1, wherein the request information further includes information indicating transmission power to be used.
3. The radio apparatus according to claim 1, wherein the information indicating the frequency for which use is requested and the frequency permission information are expressed in units of channels having a predetermined bandwidth.
The first radio system includes a radio device that belongs to a frequency band assigned to a specific application and uses a specific channel, and the second radio system uses a frequency band assigned to the specific application. The wireless device according to claim 1, wherein the wireless device is shared.
A communication method using a wireless device belonging to a second wireless system different from the first wireless system in which a frequency band to be used overlaps with the first wireless system,
Generating request information including information indicating a frequency belonging to a frequency band used by the first wireless system and requesting use, and own position information;
Transmitting the request information to a master device that manages information indicating the frequency and position of a wireless device belonging to the first wireless system in a searchable manner;
Receiving frequency permission information indicating a frequency belonging to a frequency band used by the first wireless system and permitted to be used by the master device based on the request information;
Detecting the presence or absence of radio waves of a wireless device belonging to the first wireless system at a frequency permitted to be used based on the frequency permission information;
A communication method comprising: starting transmission at a frequency permitted to be used when the detection unit does not detect radio waves of the wireless device belonging to the first wireless system.