JP6591610B2 - Wireless communication apparatus and wireless communication method - Google Patents

Description

  The present invention relates to movement of a used frequency channel by a communication partner apparatus in a wireless communication apparatus capable of simultaneous communication using a plurality of frequency channels.

  Conventionally, when a wireless communication terminal is connected to a wireless communication base station, and the wireless communication terminal changes the frequency channel, it scans whether there is a wireless communication base station that can be connected by the moved frequency channel, As a result of confirming its existence and confirming that it is suitable as a wireless communication base station to be connected, the wireless communication terminal transmits a connection request to the wireless communication base station. In response, the wireless communication base station permits the connection to complete the connection, and the wireless communication terminal starts communication with the wireless communication base station (see, for example, Non-Patent Document 1).

  In addition, there are a procedure for the radio communication base station to move to another frequency channel together with a radio communication terminal connected thereto, and a procedure in which the entire system moves to another frequency channel in a system composed of only radio communication terminals ( For example, refer nonpatent literature 1). In addition, some systems that perform simultaneous communication using a plurality of frequency channels have been studied (for example, see Non-Patent Documents 2, 3, and 4, Patent Documents 1, 2, 3, and 4).

  In IEEE802.11 wireless LAN, there is a discussion of sharing a plurality of frequency channels under one wireless communication base station from the viewpoint of ensuring coverage and effective use of frequency channels (for example, see Non-Patent Document 4). A method in which a control station collects information between wireless communication base stations and assigns an optimal communication channel to a wireless communication terminal (see, for example, Patent Document 1 and Non-Patent Document 3), and a method in which a communication protocol is assigned to a wireless communication terminal (for example, a patent). Reference 2), a method in which a wireless communication base station capable of communicating with a plurality of frequency channels newly assigns a frequency channel to a communication requesting terminal according to a wireless situation or the like (for example, Patent Document 3), and a connected wireless communication terminal There is a method for handing over to another system (for example, Patent Document 4).

JP 2006-246115 A JP-A-11-205352 JP 2004-32210 A JP 2002-77965 A

IEEE Std. 802.11-2007, "IEEE Standard for Information technology- Telecommunications and information exchange between systems- Local and metropolitan area networks- Specific requirements; Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications", IEEE Computer Society, June 12, 2007. R. Lyenger, et al., "Analysis of Contention-based Multi-channel Wireless MAC for Point-to-multipoint Networks," Proc. Of the 2006 International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM'06) , 26-29 June 2006, 3 pp.-. Y. Huang, et al., "Architecture and Scheduling Algorithm for a Multi-Channel Wireless Infrastructure Network with Diversity Management Layer," Proc. Of the 44th IEEE Conf. On Decision and Control, and the European Control Conf. 2005, Dec. 12-15, 2005, pp. 406-410. R. C. Daniels, et al., "Multi-band Modulation, Coding, and Medium Access Control," doc .: IEEE 802.11-07 / 2780r1, Nov. 2007.

  In the above-described prior art, even if the radio communication base station can transmit / receive on a plurality of frequency channels, the radio communication terminal connected to the radio communication base station can transmit / receive on a plurality of frequency channels. I can't figure out. Therefore, when the radio communication terminal changes the frequency channel to another frequency channel that can be transmitted and received by the radio communication base station, the radio communication terminal needs to scan whether there is a radio communication base station that can be reconnected. is there.

  In addition, even when a plurality of communication schemes, such as modulation and coding schemes and security schemes, can be used in the radio communication base station, the radio communication base station can communicate with other communication systems corresponding to other frequencies. Do not notify device. Therefore, when the wireless communication terminal moves to another frequency channel that can be transmitted / received by the wireless communication base station, the wireless communication terminal again transmits information on the communication method corresponding to the frequency channel of the wireless communication base station to the wireless communication base station. Need to get from the station.

  A radio communication base station that can use a plurality of communication schemes does not manage a communication scheme supported by the radio communication terminal, for example, a modulation and coding scheme or a security scheme, across a plurality of channels. Therefore, when the wireless communication terminal moves to another frequency channel that can be transmitted / received by the wireless communication base station, the wireless communication base station needs to acquire again information related to the communication method supported by the wireless communication terminal from the wireless communication terminal. There is.

  As described above, it is preferable that it is possible to notify that transmission / reception with a plurality of frequency channels is possible. In addition, if a plurality of communication systems, such as a modulation and coding system and a security system, can be used, it is preferable that a communication system corresponding to another frequency can be notified at each frequency. Furthermore, it is preferable that a certain wireless communication apparatus can manage a communication method supported by another wireless communication apparatus across a plurality of channels.

  The present invention has been made in view of such circumstances, and an object of the present invention is to efficiently perform communication while switching each of a plurality of frequency channels or a plurality of communication methods.

  According to an aspect of the present invention, there is provided a wireless communication apparatus capable of simultaneous communication using two or more frequency channels, and an identifier of a second frequency channel in a state in which wireless packets can be received in addition to the first frequency channel. A notification means for notifying the communication method used in the second frequency channel on the first frequency channel; and a notification from the wireless communication terminal when the connection of the wireless communication terminal is permitted on the first frequency channel. A connection management table that holds a communication method usable by the wireless communication terminal together with an identifier of the wireless communication terminal and an identifier of a frequency channel including the identifier of the first frequency channel; and from the wireless communication terminal When the change request to the second frequency channel is permitted, the connection management table is referenced using the identifier of the wireless communication terminal. The wireless communication terminal seeking communication method available, including a communication means for communicating with the wireless communication terminal in the second frequency channel by using the communication scheme by.

  According to the present invention, communication performed while switching each of a plurality of frequency channels or a plurality of communication methods can be performed efficiently.

The typical figure in case the wireless communication base station and wireless communication terminal which concern on embodiment connect. The functional block diagram which shows the communication function part which the radio | wireless communication base station and radio | wireless communication terminal which concern on embodiment contain. The functional block diagram which shows the communication function part detailed in the radio | wireless communication base station which concerns on embodiment. The figure which shows the operation example on the frequency of the radio | wireless communication base station which concerns on 1st Embodiment. The figure of another example which shows the operation | movement on the frequency of the radio | wireless communication base station which concerns on 1st Embodiment. The figure which the radio | wireless communication base station and radio | wireless communication terminal which concern on 1st Embodiment connect. The figure which shows the flame | frame structure in the MAC layer in IEEE802.11 wireless LAN which concerns on 1st Embodiment. The figure which showed the content of the Frame Control field in FIG. 7 which concerns on 1st Embodiment. The figure which the radio | wireless communication base station which concerns on 1st Embodiment transmits a Beacon frame. The example of notation of the field in the MAC frame for the radio | wireless communication base station which concerns on 1st Embodiment to notify the information of another frequency channel. An example in which two frequency channels according to the first embodiment partially overlap on the frequency channel. Another example in which two frequency channels according to the first embodiment partially overlap on the frequency channel. The example of notation of the field in the MAC frame for the radio | wireless communication terminal which concerns on 1st Embodiment to notify the information of another frequency channel. 6 is an example of a connection management table in the radio communication base station according to the first embodiment. 6 is an example of a connection management table in the wireless communication terminal according to the first embodiment. Explanatory drawing when the radio | wireless communication terminal which concerns on 1st Embodiment makes the change request | requirement of a frequency channel to a radio | wireless communication base station. The figure which the radio | wireless communication base station which concerns on 2nd Embodiment transmits a Beacon frame. Transmission rate defined in IEEE802.11a according to the second embodiment. The relationship between MCS prescribed | regulated by IEEE802.11n which concerns on 2nd Embodiment, and the transmission rate at the time of a 20-MHz channel band. The connection management table example in the radio | wireless communication base station which concerns on 2nd Embodiment. The connection management table example in the radio | wireless communication terminal which concerns on 2nd Embodiment. The Beacon frame which concerns on 3rd Embodiment. The HT Capabilities element which concerns on 3rd Embodiment. Capability element according to the third embodiment. The HT Information element which concerns on 3rd Embodiment. The Association Request frame which concerns on 3rd Embodiment. The figure which the radio | wireless communication base station which concerns on 4th Embodiment transmits a Beacon frame. The figure which the radio | wireless communication base station which concerns on 5th Embodiment transmits a Beacon frame. BSSDescription according to the fifth embodiment. The figure of another example in which the radio | wireless communication base station which concerns on 5th Embodiment transmits a Beacon frame. The figure which puts Multi-channel ID in the Frame Body field of the Beacon and Probe Response frame which concerns on 6th Embodiment. The Sequence Control field which concerns on 7th Embodiment. The connection management table example in the radio | wireless communication base station which concerns on 9th Embodiment. The figure which the radio | wireless communication base station which concerns on 10th Embodiment transmits a Beacon frame. 10 is a connection management table example in a wireless communication terminal according to a tenth embodiment. An example of a connection management table in a radio communication base station according to the eleventh embodiment. An example of a connection management table in a radio communication base station according to the thirteenth embodiment. The example of the connection management table updated in the radio | wireless communication base station which concerns on 13th Embodiment. The figure which showed the relationship between the radio | wireless communication base station and radio | wireless communication terminal which concern on 14th Embodiment.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings.

  FIG. 1 is a typical diagram when a radio communication base station and a radio communication terminal according to the embodiment are connected. In FIG. 1, a wireless communication base station 101 and a wireless communication terminal 201 are connected. The radio communication base station 101 may be connected to one or more radio communication terminals other than the radio communication terminal 201, or may be connected to one or more other radio communication base stations, It may be connected to a wired network. The wireless communication terminal 201 may be connected to one or more other wireless communication terminals connected to the wireless communication base station 101. Here, the "connection" between the wireless communication base station and the wireless communication terminal, or between the wireless communication base stations, or between the wireless communication terminals recognizes the existence of each other, and exchanges notifications of necessary capabilities for communication I mean. Wireless communication can be performed between a wireless communication base station and a wireless communication terminal in a connected state, or between wireless communication base stations or between wireless communication terminals. A wireless communication base station and a wireless communication terminal connected thereto correspond to a component called an infrastructure BSS (Infrastructure BSS (Basic Service Set)) in the IEEE802.11 wireless LAN system. The infrastructure BSS is sometimes simply referred to as BSS.

  FIG. 2 is a functional block diagram showing a communication function unit built in the radio communication base station and the radio communication terminal according to the embodiment. As shown in FIG. 2, the wireless communication function unit 8 includes a baseband processing unit 12, a frequency conversion circuit 6, and a wireless antenna 10. For example, the wireless communication function unit 8 generates data to be communicated through a logical link control (LLC) layer defined by the IEEE802 standard. The wireless communication function unit 8 may be connected to a user interface that displays on a display or the like. In the configuration of FIG. 1, the wireless communication base station is connected to a wired network or the like, and the wireless communication function unit 8 of the wireless communication base station exchanges data with other wireless communication base stations or wireless communication terminals on the wired network. You may be able to.

  The baseband processing unit 12 includes a MAC (Media Access Control) unit 2 and a PHY (PHYsical) unit 4. The baseband processing unit 12 includes, for example, an IEEE802.11 wireless LAN (including a series of extended / complementary standards after IEEE802.11 such as 802.11a, b, e, g, h, i, j, and n, and the like). Is compliant. The MAC unit 2 is a part that performs a defining operation related to the MAC layer, and the PHY unit 4 is a part that performs a defining operation related to the PHY layer. The MAC unit 2 has a memory for providing a work area, a frame buffer, and the like, and performs MAC header processing, access control during MAC frame transmission, reception frame processing including response frame transmission, and settings between wireless communication terminals. Management related to. The memory also stores wireless communication terminal information or wireless communication base station information described later. Note that the memory is specialized for MAC processing, and may be externally attached to the MAC unit 2 instead of being built in the MAC unit 2, or may be used for processing other than the MAC layer. The PHY unit 4 is connected to the MAC unit 2 and performs PLCP (Physical Layer Convergence Protocol) header processing, modulation / demodulation processing, A / D conversion processing, and the like.

  The frequency conversion circuit 6 is connected to the PHY unit 4, and in order to radiate radio waves from the antenna 10, the frequency of the transmission signal is converted in stages, and the received signal is processed so that the received radio waves can be processed by the PHY unit 4. It is a circuit that converts the frequency of the signal stepwise.

  For example, data input from the LLC layer is converted into a MAC frame by the MAC unit 2, converted into a PHY packet by the PHY unit 4, and transmitted as a radio signal from the antenna 10 via the frequency conversion circuit 6. Conversely, the radio signal received from the antenna 10 is processed via the frequency conversion circuit 6, the PHY unit 4, and the MAC unit 2, and data addressed to the terminal is output to an upper layer such as an LLC layer.

  FIG. 3 shows a detailed functional block diagram of the radio communication base station according to the embodiment. Reference numerals shown in FIG. 3 are the same as those in FIG. The wireless communication base station has at least two or more access control units (PHY 1 access control unit 31 and PHY 2 access control unit 32 in FIG. 3) corresponding to the PHY unit 4 in the MAC unit 2, and the PHY unit 4 Has processing units (PHY1 processing unit 33 and PHY2 processing unit 34 in FIG. 3) corresponding to at least two PHY layers, and each access control unit is connected to each PHY processing unit (in FIG. 3, for PHY1) The access control unit 31 is connected to the PHY1 processing unit 33, the PHY2 access control unit 32 is connected to the PHY2 processing unit 34), and each PHY processing unit is connected to each frequency conversion circuit (the first frequency conversion circuit in FIG. 3). 35, connected to the second frequency conversion circuit 36), and each frequency conversion circuit is connected to the antenna. Each access control unit (PHY 1 access control unit 31 and PHY 2 access control unit 32 in FIG. 3) in the MAC unit 2 has one MAC layer management unit (MAC subLayer Management Entity (MLME) in IEEE802.11 wireless LAN). In addition to being connected to 30 (corresponding to the portion to be performed), the PHY access control unit is connected (arrow between the PHY1 access control unit 31 and the PHY2 access control unit 32 in FIG. 3). If the frequency conversion circuit 8 and the antenna 10 are configured to transmit or receive radio signals of different frequencies from the antenna 10 at the same time, configurations other than those shown in FIG. 3 are possible.

  For example, the wireless signal transmitted through the PHY1 access control unit 31, the PHY1 processing unit 33, and the first frequency conversion circuit 35 in FIG. 3 is the IEEE802.11b, IEEE802.11g, or 2.4GHz band of the 2.4 GHz band wireless LAN. IEEE802.11n compatible signals that operate at the same time, and the wireless signals transmitted through the PHY2 access control unit 32, the PHY2 processing unit 34, and the second frequency conversion circuit 36 are either IEEE802.11a or 5GHz band wireless LAN. This is an IEEE802.11n compatible signal that operates in the 5GHz band.

  In this case, the access control unit 31 for PHY1 uses access control parameters (such as slot length and SIFS (Short Inter-Frame Space used to perform CSMA / CA) according to IEEE802.11b, IEEE802.11g, or 2.4GHz band IEEE802.11n. Control for transmitting a radio signal by using information such as a length) and a modulation and coding scheme. The PHY2 access control unit 32 performs control for transmitting a radio signal by using access control parameters and modulation coding scheme information conforming to IEEE802.11a or 5GHz band IEEE802.11n. In this way, the base station may be a radio communication base station that performs communication using different extension methods within the same standard at the same time. Also, different extension methods within the same standard, for example, 2.4GHz band IEEE802.11g and 5GHz band IEEE802.11a as in the above example, both are 5GHz band IEEE802.11a but the frequency channel used is channel number 36 The frequency channels used in the same standard and the same extension method as in 44 may be different.

  Alternatively, for example, the wireless signal transmitted via the PHY1 access control unit 31, the PHY1 processing unit 33, and the first frequency conversion circuit 35 of FIG. 3 is a 5 GHz band signal, and the PHY2 access control unit 32 and PHY2 processing The unit 34 and the second frequency conversion circuit 36 are in a 60 GHz band (a so-called millimeter wave band such as 57 to 62 GHz). At this time, the access control unit 31 for PHY1 performs control using parameters and information related to the transmission of the radio signal in the 5 GHz band, and the access control unit 32 for PHY2 is a radio in the 60 GHz band (for example, using a frequency band from 57 GHz to 66 GHz). Control using parameters and information related to signal transmission is performed. In this way, a radio communication base station that simultaneously uses communication systems having large frequency bands may be used.

  Alternatively, for example, wireless signals transmitted via the PHY1 access control unit 31, the PHY1 processing unit 33, and the first frequency conversion circuit 35 in FIG. 3 are mobile phones (cellular) such as GSM (registered trademark) and 3GPP (registered trademark). ), And the wireless signal transmitted via the PHY2 access control unit 32, the PHY2 processing unit 34, and the second frequency conversion circuit 36 is a signal for the wireless LAN. At this time, the PHY1 access control unit 31 performs control using parameters and information related to transmission of wireless signals for cellular phones (cellular) such as GSM and 3GPP, and the PHY2 access control unit 32 performs wireless signal transmission for wireless LANs. Control using parameters and information related to transmission is performed. In addition to this, the wireless metropolitan area network (WMAN) 802.16 system (WiMAX system) or the wireless personal area network (WPAN) 802.15 system (WiMedia system) may also be used. In this way, the wireless communication base station may simultaneously use communication methods of different wireless communication standards.

(First embodiment)
FIG. 4 is a diagram illustrating an operation example on the frequency of the radio communication base station according to the first embodiment.

  A wireless communication base station (indicated as AP (Access Point) in FIG. 4) can communicate simultaneously on a plurality of frequency channels. Although FIG. 4 shows an example of two different frequency channels, it is of course possible to communicate simultaneously on three or more different frequency channels as shown in FIG.

  Each frequency channel is defined, for example, from a set of a center frequency (indicated as f1 and f2 in FIG. 4) and a channel band (indicated as BW1 and BW2 in FIG. 4), and a channel identifier (in FIG. 4) is distinguished from each frequency channel. ch.1, ch.2). Therefore, in FIG. 4, the center frequency is f1 and the channel band is BW1 in the channel identifier ch.1.

  On the other hand, if each frequency channel belongs to a large frequency band and the frequency channels are distinguished from each other, it is only necessary to be able to understand the frequency band. For example, as frequency channels, ch.1 may be indicated at a level of 5 GHz band and ch.2 may be indicated at a level of 60 GHz band. This is because the difference in operation at a fine frequency channel level within the frequency band is basically basically (although there are cases where restrictions such as transmission power and restrictions and access parameters are changed). When operating as 802.11b, 802.11g, or 802.11n in the 2.4 GHz band, the basic functions that a wireless communication terminal (including a wireless communication base station) can handle are not different depending on the fine frequency channel in the 2.4 GHz band. The same applies to the case of operating as 802.11a or 802.11n in the 5 GHz band, and the same can be expected in the 60 GHz band.

  Here, “communicating simultaneously on multiple frequency channels” means, for example, that there are two channels, ch.1 and ch.2, in each of the two channels ch.1 and ch.2. When the wireless communication terminal transmits a wireless signal to the wireless communication base station, the wireless communication base station passes the wireless signal to the MAC unit 2 through demodulation and decoding based on the configuration shown in FIG. This means that appropriate reception processing can be performed as a frame.

  This will be specifically described with reference to FIG. 6 shows a situation in which the radio communication terminal 201 sends a radio signal using ch.1 to the radio communication base station 101, and the radio communication terminal 202 sends a radio signal using ch.2. Even if these wireless signals are transmitted at the same time or partially overlapped in time, the wireless communication base station 101 demodulates and decodes each wireless signal, and the MAC unit 2 performs a MAC frame. As a result, appropriate reception processing can be performed.

  For example, in ch.1, the wireless communication base station 101 and the wireless communication terminal 201 use IEEE802.11g, and the wireless communication terminal 201 knows the parameters used when the wireless communication base station 101 configures the BSS in ch.1. A probe request frame is transmitted to the wireless communication base station 101. In response to this, the wireless communication base station 101 responds to the probe request frame with an Ack frame, and then generates a probe response frame for notifying parameters used in the BSS. Transmit to terminal 201. On the other hand, in ch.2, the wireless communication base station 101 and the wireless communication terminal 202 use IEEE802.11a, and the wireless communication terminal 202 subscribes to the BSS configured by the wireless communication base station 101 in ch.2, and the wireless communication base station 101 To send data to the wireless communication base station 101 to start data exchange (i.e., communication), the wireless communication base station 101 responds to the authentication frame with an Ack frame, and then the wireless communication terminal 202 Send an Authentication frame that responds to the contents of the Authentication frame. Settings for using, for example, WEP (Wired Equivalent Privacy), which is an encryption method, can be performed on this Authentication process. When the authentication process related to a series of authentication is completed between the wireless communication terminal 202 and the wireless communication base station 101, the wireless communication terminal 202 has what capability the terminal itself has in the wireless communication base station 101 (Capability) And an Association Request frame is transmitted to the radio communication base station 101 so that actual data exchange within the Infrastructure BSS can be started. The wireless communication base station 101 responds to the Association Request frame with an Ack frame, and then transmits an Association Response frame including whether or not to accept the Association Request to the wireless communication terminal 202 while including the Capability of the own terminal. . After these series of connection setting frame exchanges, the wireless communication terminal 202 starts exchanging data frames with the wireless communication base station 101.

  As described above, the radio communication base station 101 can independently perform transmission and reception in ch.1 and ch.2. On the other hand, for example, the wireless communication terminal 201 can perform communication using 802.11g in ch.1 and can perform communication using 802.11a in ch.2. The wireless communication terminal 201 has at least one frequency conversion circuit of FIG. 2, and can actually transmit and receive at least one of ch.1 and ch.2 when transmitting a radio signal. Note that the wireless communication terminal 201 may have the configuration of FIG. 3 like the wireless communication base station 101 and can simultaneously communicate with both ch.1 and ch.2.

  In such a situation, the radio communication base station 101 notifies the frequency channel information of ch.2 using ch.1. The notification may be a notification. Annunciation is to notify an unspecified number of wireless communication terminals (including neighboring wireless communication base stations). For example, in IEEE802.11 wireless LAN, a frame such as a Beacon frame with a broadcast address as the destination is used. You may go.

  Here, a frame configuration at the MAC layer in the IEEE802.11 wireless LAN will be described with reference to FIG.

  The MAC header part is from the Frame Control field to the frame body field in FIG. In addition to the one shown in FIG. 7, a field such as a QoS Control field used when performing QoS control may be added to the MAC header part.

  The Frame Control field shown in FIG. 7 is shown in FIG. Above each field, the bit position is indicated as BX (X = 1, 2, ...).

  As the type of MAC frame to be transmitted, in the IEEE 802.11 wireless LAN system, a data frame (Data frame) that transmits data generated above the MAC layer (however, when empty data is generated and transmitted in the MAC layer) There is also a management frame (Management frame) for transmitting management information at the MAC layer level, and a control frame (Control frame) related to access control at the MAC layer. These major classifications are indicated in the Type field of the Frame Control field. For example, the above Beacon frame is a management frame, and {B2, B3} = {0, 0} indicating that it is a management frame is described in the Type field. In the data frame, {B2, B3} = {0, 1}, and in the control frame, {B2, B3} = {1, 0}. On the contrary, it can be said that the data field, the management frame, and the control frame are distinguished by the description of the Type field. In addition to such major classifications of frame types, the Subtype field indicates the detailed frame types in each major classification. For example, in the Beacon frame, {B4, B5, B6, B7} = {0, 0, 0, 1} is described as the Subtype field.

  FIG. 7 shows the most general configuration, and some fields are omitted depending on the frame. For example, there are four address fields in FIG. All address fields are used when data frames are transmitted between radio communication base stations, but basically three of Address 1, Address 2, and Address 3 are used for other data frames, and Address is used for management frames. 1, Address 2, Address 3, and control frame, only Address 1 and only Address 1, Address 2 are basic (however, control frame may be included in control frame. Is not this limit).

  In 802.11, all the bit values of the Address 1 field indicating the direct transmission destination address are 1 in the broadcast frame. A broadcast frame is transmitted to all wireless communication terminals without specifying a receiving destination. In addition, there is a multicast frame as a frame transmitted to a plurality of wireless communication terminals. A multicast frame is a frame in which the first bit of the first octet field of the Address 1 field (which is specified as Individual / Group bit) is set to 1 (i.e., Group bit). Whether it is addressed to a plurality of wireless communication terminals is specified. It can be said that the broadcast frame is a special case of a multicast frame, and a frame transmitted to a single wireless communication terminal is called a unicast frame with respect to the group address frame addressed to the plurality of wireless communication terminals. When the wireless communication terminal receives a broadcast frame in which the bit value of the Address 1 field is all 1, and in the multicast frame, if the multicast address indicated in the Address 1 field includes the own terminal, the wireless communication terminal performs reception processing for the own terminal. Depending on the frame type, in the address field described in BSSID that identifies the BSS (data frame, Address 2 field if it was sent from the wireless communication base station to the wireless communication terminal, Address 3 field if the management frame), Perform reception processing after confirming that the BSS to which the wireless communication terminal belongs.

  In the frame body field portion, information generated in the MAC layer is stored in the management frame, and data generated in the upper layer of the MAC layer and passed to the MAC layer is stored in the data frame. In the control frame, information generated in the MAC layer may be included in the Frame Body field, or the field itself may not exist.

  An operation in which the radio communication base station 101 broadcasts information on the frequency channel of ch.1 and ch.2 will be described using an example using an IEEE802.11 Beacon frame. Basic information about BSS including synchronization information is included in the Beacon frame, but when the radio communication base station 101 transmits the Beacon frame on ch.1 as shown in FIG. Enter channel information. Here, the frequency channel information of ch.2 is the communication method used in channel identifiers ch.2 and ch.2, and in FIG. 9, the communication method information corresponds to 802.11a and 802.11n in ch.2. An example is shown. As described above, in this embodiment, the communication standard method is used as the communication method information. As described above, both 802.11a and 802.11n are extended standards in the communication standard scheme of 802.11, but may be distinguished by their levels, or may be described only in large frames such as 802.11 and GSM. For example, even if it corresponds to the 60 GHz band, there is a communication standard method defined in 802.11 (802.15.3c) or a communication standard method defined in 802.11. In this case, for example, if an 802.11 standard millimeter wave is supported, an extension method corresponding to the 802.11 standard millimeter wave band is notified. If 802.15.3c, 802.15.3c is notified as a communication standard method. In 802.15.3c, there are a plurality of methods in the PHY layer, so if it corresponds to a part of it, it notifies to a level where it can be identified.

  If the specific communication method in ch.1 and ch.2 can be distinguished by the frequency band to which each frequency channel belongs, the channel identifiers ch.1 and ch.2 can be used to specify the specific communication method. The communication method can be omitted. In this case, the communication method is also notified by inserting the channel identifier. For example, if it is assumed that 802.11 wireless LAN is used, it will be notified that the standard of the millimeter wave specified in 802.11 if ch.1 is 5GHz band and 802.11a / n and ch.2 is 60GHz band. Will be. If a notification or connection request is made in the 802.11 standard frame format, it indicates that the wireless LAN is assumed to be 802.11.

  In addition, for example, the frequency channel information of ch.1 and ch.2 includes a method of indicating as a frequency band level and a subset of frequency channels allocated within the frequency band. In the case of supporting a subset of frequency channels within a frequency band, by defining several types of subsets and indicating the frequency band and subset name, it is possible to support the frequency channel group of the subset in that frequency band. It can also be shown. In this case, for example, ch.1 = 2.4 GHz band channel subset 1 (= corresponds only to channel number 1), ch.2 = 5 GHz band channel subset 10 (= corresponds to channel numbers 36, 40, 52), etc. Can be notified.

  9 shows an example in which the position of the frequency channel is broadcast using channel identifier ch.2. In particular, when the center frequency and the channel bandwidth can be specified only by the channel identifier, such as those in which the channel bands of the frequency channels used in the communication base station 101 are all the same and are arranged at equal intervals, this may be done. Alternatively, even if there is an irregular frequency channel arrangement, if there is information related to the frequency channel arrangement in advance between the radio communication base station and the radio communication terminal, the radio communication terminal notifies the frequency channel that the radio communication base station notifies from the channel identifier. It is possible to know the center frequency (f2 in this example) and the channel bandwidth (BW2 in this example) of the frequency channel (in this example, the frequency channel having the channel identifier ch.2). Therefore, a subfield as shown in FIG. 10 (a) may be provided and notified as information on another frequency channel used by the radio communication base station 101 in the Frame Body field of the Beacon frame.

  On the other hand, there are cases where the wireless communication terminal cannot specify necessary frequency channel information such as the center frequency and the channel bandwidth by using only the channel identifier in this way.

  IEEE802.11a has a channel bandwidth of 20 MHz, and IEEE802.11n has an option of 40 MHz in addition to the channel bandwidth of 20 MHz. For example, if channel width BW1 of ch.1 is 20 MHz, channel bandwidth BW2 of ch.2 can be doubled, such as 40 MHz, the channel bandwidth can be used as frequency channel information of ch.2. Add BW2 information. As the information of BW2, the actual channel bandwidth (for example, 40 MHz in this example) may be described, or a different channel bandwidth is an integer greater than or equal to 2 with respect to the reference channel bandwidth (for example, 20 MHz here) If it is doubled, the information on the channel band can be normalized with the reference channel band and expressed as an integer. In this example, BW2 is twice BW1, so it can be expressed as 2. If the reference channel band used for normalization is known to the wireless communication terminal, the normalized value may be entered as channel band information as it is. If it is not known, if the channel used for the reference is the frequency channel that is currently broadcasting information on other frequency channels (ch.1 in this example), the frequency channel that is broadcasting information on other frequency channels itself This information is also broadcast (in this example, the channel bandwidth is BW1 as the channel information of ch.1), so that the wireless communication terminal can specify information of other frequency channels. In 802.11 wireless LAN, a regulatory class is defined so that it can be expressed in combination with information on the frequency channel used as a reference (center frequency position, channel band, etc.) and the frequency direction when the band is expanded. In this regulatory class, a new corresponding channel band (for example, 60 MHz, 80 MHz, etc.) and an extended frequency direction may be defined as necessary and expressed by this and a channel identifier.

  On the other hand, there are cases where the center frequency cannot be specified only by the channel identifier, for example, the center frequencies are not equally spaced. In this case, information on the center frequency f2 is added as information on the frequency channel of ch.2. Naturally, it may be notified together with the channel identifier in combination with the channel bandwidth information described above. Example of subfield description to be included in the Frame Body field of the frame when the center frequency and channel bandwidth are broadcast together with the channel identifier as information on other frequency channels (ch.2 in this example) used by the radio communication base station 101 Is shown in FIG.

  In addition, two (or more) frequency channels may partially overlap in frequency. For example, as shown in FIG. 11, when the channel bandwidth is doubled in the direction in which the frequency increases with respect to the frequency channel of ch.1, the channel information of ch.1 is centered in the Beacon frame transmitted by ch.1. If the frequency f1 and the channel bandwidth BW1 are known to the wireless communication terminal, the channel bandwidth corresponding to BW1 in the direction of increasing the frequency with reference to the center frequency f1 and the channel bandwidth BW1 as the channel information of ch.2 (In this example, described as “+2”), the radio communication terminal 201 can specify the frequency channel information of ch.2. FIG. 10C shows a description example of subfields to be entered in the Frame Body field of the frame in this case. Based on this example, in the case of FIG. 12 in which the channel band is doubled in the direction of decreasing frequency, “−2” is described as the channel information of ch.2 while broadcasting the channel information of ch.1. If the center frequency f1 and the channel bandwidth BW1 are unknown to the wireless communication terminal as the channel information of ch.1, these information may be broadcast together with the Beacon of ch.1. If you want to notify the wireless communication terminal that the channel bandwidth to be expanded is an optional treatment such as 802.11n 40 MHz and you do not necessarily need to support ch.2, as information on other frequency channels For example, as shown in FIG. 10D, a subfield in which mandatory / option is described may be inserted, and “1” may be set in the subfield if the option can be handled. In such a case as well, a corresponding channel band (for example, 60 MHz or 80 MHz) and an extension frequency direction may be determined as a regulatory class as necessary, and expressed as a regulatory class for the reference frequency channel.

  The series of channel information and the expression of the communication method can be applied to the case of a wireless communication terminal described later.

  In this way, when the information of the other frequency channel (ch.2 in this example) is broadcasted by the Beacon of ch.1, the radio communication terminal 201 transmits another frequency channel (this In the example, it is possible to grasp that communication is possible even in ch.2) and what communication method is used in the frequency channel.

  In the case as shown in FIG. 9, when the wireless communication terminal 201 knows that the wireless communication base station 101 uses 802.11g in ch.1 and uses 802.11a in ch.2, first, the wireless communication terminal 201 first receives the current reception. In order to start communication with the radio communication base station 101 using the frequency channel ch.1 being set, a connection setting procedure with the radio communication base station 101 is started. A procedure for the wireless communication terminal 201 to discover the wireless communication base station 101 and set the connection will be described using an example in 802.11. The wireless communication terminal 201 searches for (scans; SCAN) a wireless communication base station connected through a frequency channel that can be transmitted and received by the terminal itself. As a SCAN operation, a passive scan that receives a Beacon frame transmitted by a radio communication base station on a frequency channel, a Probe Request frame is transmitted to the radio communication base station, and a response to the Probe Request frame is received from the radio communication base station. There is an active scan to receive the probe response frame. The Probe Request frame may be transmitted without specifying the destination like a broadcast frame, or may be transmitted to a specific radio communication base station. When the radio communication base station 101 receives the probe request frame from the radio communication terminal 201, the radio communication base station 101 generates a probe response frame after the Ack response. However, the radio communication base station 101 relates to other frequency channels included in the aforementioned Beacon frame in the Frame Body field. The same information is inserted and transmitted to the wireless communication terminal 201. Alternatively, the wireless communication base station 101 does not include information on other frequency channels in the Beacon frame, but the wireless communication base station 101 uses the Probe Request frame to request information on other frequency channels. Information related to other frequency channels may be included in a Probe Response frame in response thereto. After the SCAN operation, the wireless communication terminal 201 follows the above-described authentication procedure and association procedure.In particular, in this embodiment, when the wireless communication terminal 201 transmits an association request frame to the wireless communication base station 101, the frame body field Inform the Capability notification subfield of the communication method that can be used in ch.2. For example, the wireless communication terminal 201 notifies that it can communicate using 802.11a in ch.2 by providing a subfield having a format as shown in FIG. 13 in the Association Request frame transmitted to the wireless communication base station 101. Of course, in addition to FIG. 13, the wireless communication base station 101 may use the same expression method as the format in which the corresponding frequency channel and communication method shown in FIG. 10 and the like are notified by Beacon and notified by Probe Response.

  Therefore, the radio communication base station 101 receives the Association Request frame from the radio communication terminal 201 using ch.1 using 802.11g, and the communication request station 101 communicates using 802.11g using ch.1 in the association request frame. Although the Capability corresponding to the wireless communication terminal 201 is described, in addition to this, the wireless communication base station 101 can grasp that communication can be performed using ch.2 using 802.11a. The frequency channel currently used for communication with the wireless communication terminal 201 is ch.1.

  In addition, it is assumed that the radio communication terminal 202 notifies the radio communication base station 101 of frequency channels and communication methods that can be used by the own terminal using an Association Request frame. For example, the wireless communication terminal 202 notifies that communication is possible with 802.11a / g / n. It is assumed that the frequency channel actually used for communication by the wireless communication terminal 202 and the wireless communication base station 101 is ch.2.

  Here, the wireless communication base station 101 creates a connection management table relating to the communication capability of the wireless communication terminal as shown in FIG. This management table may be held by the MAC layer management unit 30 in FIG. 3 or may be held in an external memory to which the MAC layer management unit 30 is connected. The radio communication base station 101 may notify the capability of the radio communication terminal of the radio communication base station by using a Beacon frame / Probe Response frame that it has the ability to hold information between frequency channels of the radio communication terminal. In FIG. 14A, the identifier of the wireless communication terminal is the item of the wireless communication terminal 201 (indicated as STA201), the identifier of the frequency channel that can be supported notified by the wireless communication terminal 201, the communication method corresponding to each frequency channel, The identifier of the frequency channel currently communicating is written. Here, since the wireless communication terminal 201 notifies the association request frame that it is compatible with ch.2 and the communication method that can be used in ch.2 is 802.11a, while the association request frame describes the information, The frame itself is transmitted in ch.1, and it is also described in the frame that it corresponds to 802.11g as information for performing communication on the current channel, that is, ch.1. Can also be supplemented even if “ch. 1” is not written in the Association Request frame, and can be stored as information in the management table.

  Here, the identifier of the wireless communication terminal does not necessarily need to be an actual MAC address of the wireless communication terminal, and may be any one that can be uniquely identified internally by the wireless communication base station. For example, in 802.11, an association identifier (AID) is placed in the Frame Body field of an Association Response frame that the radio communication base station 101 transmits in response to an Association Request frame from a radio communication terminal (for example, 201). The AID is a unique value assigned to each wireless communication terminal between values 1 to 2007 in the association process so that the wireless communication base station identifies the wireless communication terminal. Of the two octets that are included in the frame as the AID field, put "1" in Bit 14 and Bit 15, and the above unique value (AID) between 1 and 2007 in the remaining B0 to Bit13 Will be included. The wireless communication base station 101 receives an Association Request frame from the wireless communication terminal 201 and determines whether to permit connection of the wireless communication terminal 201 via the MAC layer management unit 30 in FIG. 3 (STA Management Entity; SME). In this case, the wireless communication terminal 201 is notified that the connection is permitted in the Status Code subfield of the Association Response frame (the Status Code subfield is also used for notifying connection refusal). The MAC layer management unit 30 puts the AID assigned to the terminal 201 in the wireless terminal identifier item of the connection management table, extracts information on frequency channels and communication methods that can be supported by the wireless communication terminal 201 from the Association Request frame, and performs wireless communication. Information is written in a predetermined item corresponding to the terminal identifier. Although not shown in FIGS. 2 and 3, the SME is connected to the MAC layer management unit 30 (included in the MAC unit 2 in FIG. 2), and includes other layers (layers), wireless communication terminals, wireless communication base stations. Is about to decide the operation policy.

  Note that a single communication standard that spans multiple frequency channels is used in the radio communication base station, but if the corresponding extended standard differs between frequency channels, the extended standard may be compatible. . For example, 802.11g is 802.11b, 802.11n is 5GHz, 802.11a if it is 5GHz, and 802.11b / g if it is 2.4GHz. By doing so, it can be seen that 802.11b is also supported. In addition, it is understood that 802.11a is also supported by notifying that it corresponds to 802.11n and that it corresponds to ch.2 of 5 GHz. As described above, when there is a backward compatible relationship between the extended standards and the frequency channel corresponding to the extended standard can be specified, the information on the comprehensive standard and the corresponding frequency channel is omitted, as shown in FIG. Connection management information may be held in the network.

  On the other hand, the wireless communication terminal 201 can communicate with the wireless communication base station 101 even with ch.2 using the Beacon frame or Probe Response frame received from the wireless communication base station 101, and supports the communication method of 802.11a with ch.2. (The wireless communication terminal 201 does not support 802.11n, so it may not be possible to know that the wireless communication base station 101 supports 802.11n), and at least connected by an Association Response frame When a notification of permission is received, a connection management table as shown in FIG. 15 can be created. After the connection-destination wireless communication base station is uniquely determined, the base station identifier of FIG. 15 is (the identifier of the connection-destination wireless communication base station is another information management location, for example, an information management base (MIB)). (It is possible to omit it after keeping it as a MIB value.) In FIG. 15, the communication method 802.11n not supported by the wireless communication terminal 201 is described as a communication method in ch.2 because it is not recognized because the wireless communication terminal 201 is not supported even in the Beacon frame or Probe Response frame. However, if it can be recognized but not supported, it is a matter of course that 802.11n may be described in the item of the communication method corresponding to ch.2. Before receiving connection permission in the Association Response frame, the connection management table as shown in FIG. 15 is already held, and it is possible to grasp the current state of whether or not the connection permission has been received by writing the channel used when the connection permission is received. It may be. In this way, a plurality of radio communication base station candidates and frequency channel and communication method information corresponding to each radio communication base station are collected, and a radio communication base station suitable for the communication request of the terminal is selected as a connection destination. Connection setting can be started.

  When the wireless communication terminal 201 receives the Association Response frame from the wireless communication base station 101, the wireless communication base station 101 can start communication with ch.1, but the wireless communication base station 101 uses 802.11a with ch.2 according to the connection management table of FIG. You can understand that you can communicate. Therefore, the wireless communication terminal 201 can change the communication with the wireless communication base station 101 from ch.1 to ch.2. When changing the frequency channel to ch.2, in this embodiment, the radio communication terminal 201 transmits the change request 1001 to the radio communication base station 101 using ch.1, as shown in FIG. If based on 802.11, this change request 1001 is a unicast management frame (the same applies to the subsequent frames 1002 to 1004), and the wireless communication base station 101 is a unicast frame addressed to itself. It is also possible to transmit an Ack frame and accept the channel change request of the wireless communication terminal 201 as it is, but in FIG. 16, the wireless communication base station 101 sends a response (permitted in this case) to this change request in the Status Code subfield, etc. A channel change response 1002 to be notified is sent. As a result, the wireless communication terminal 201 can confirm the determination of the wireless communication base station 101 whether or not the wireless communication base station 101 has accepted the change request to ch.2. The wireless communication terminal 201 receives a change request to ch.2 (by receiving an Ack frame to the change request frame, or if it is expected that a change response frame will be transmitted). If it is determined, send and receive on ch.2. At this time, if transmission / reception is possible only with a single frequency channel, the frequency conversion circuit 6 in FIG. 2 is switched to ch. Change parameters, switch circuits, etc.

  It is assumed that the radio communication base station 101 has a transmission queue for storing frames to be transmitted for each frequency channel. For example, the transmission queue for ch.1 is provided in the PHY1 access control unit 31 in FIG. 3, and the transmission queue for ch.2 is provided in the PHY2 access control unit 32 in FIG.

  After receiving the channel change request 1001, the radio communication base station 101 stops at least data frame transmission on ch. 1 to the radio communication terminal 201. This is because the transmission of an ACK frame (control frame) or a response frame (management frame) in response to a channel change is performed, but the entire frame transmission to the radio communication terminal 201 may be stopped after the transmission of these necessary frames. The wireless communication base station 101 moves the frame addressed to the wireless communication terminal 201 from the transmission queue for ch.1 to the transmission queue for ch.2 while stopping this frame transmission.

  As a very simple method for stopping the transmission of the frame in ch.1, assuming that the PHY1 access control unit 31 in FIG. 3 is a part for controlling the frame transmission to ch.1, the access operation is stopped here. There is a method etc. (the entire frame transmission in ch.1 will be stopped). When CSMA / CA is used as an access method, transmission may be stopped by making the same recognition as when the wireless medium (wireless medium) is busy. Alternatively, the access itself may be stopped, and the operation of issuing a frame from the transmission queue (in the PHY1 access control unit 31 in FIG. 3) may be stopped. As a method of stopping only the transmission to the wireless communication terminal 201 instead of stopping the entire frame transmission in ch. 1, the destination address of the frame is confirmed at the exit of the transmission queue of ch.1, and the wireless communication terminal 201 If so, proceed to the access, and if it is the wireless communication terminal 201, move to the transmission queue for ch.2 and check the transmission destination address of the frame that has come to the exit of the next transmission queue. . Alternatively, the access may be continued until the wireless communication terminal 201 reaches the head (exit) of the transmission queue, and the access operation may be stopped as described above when the wireless communication terminal 201 reaches the head of the transmission queue.

Similarly, after transmitting the change request 1001, the wireless communication terminal 201 also stops transmission of at least the data frame. (The transmission queue and the PHY access control unit in the MAC unit 2 in FIG. 2 are involved.)
When the wireless communication terminal 201 can cope with the communication in ch.2, the channel change completion notification 1003 is transmitted to the wireless communication base station 101 as can be seen from FIG. As a result, the wireless communication base station 101 can recognize that the wireless communication terminal 201 is now compatible with ch.2 communication. In addition, as shown in FIG. 16, the radio communication base station 101 may transmit a change completion response 1004 in order to notify the radio communication terminal 201 that the change completion notice 1003 has been received. Then, transmission of a (data) frame is started in ch.2.

  When receiving the channel change completion notification 1003, the radio communication base station 101 starts transmission of the (data) frame to the radio communication terminal 201 that has been stopped in ch. Alternatively, when transmitting the channel change completion response 1004, the radio communication base station 101 starts transmission of the (data) frame to the radio communication terminal 201 that has been stopped in ch.

  Here, for example, instead of the change completion notification 1003, the wireless communication terminal 201 may transmit a delivery response frame for the frame group received from the wireless communication base station 101 so far in ch.1 in ch.2. Good. For example, 802.11 defines a selective retransmission method (Block Ack mechanism) that uses a control frame called a Block Ack Request (BAR) frame as a delivery confirmation request frame and a control frame called a Block Ack (BA) frame as a delivery confirmation response frame. The target data frame is a QoS frame in which a QoS Control field is added to the MAC header portion, and an identifier Traffic Identifier (TID) indicating a traffic type is entered in this QoS Control field. After setting the Block Ack mechanism with other wireless communication terminals (here, wireless communication base stations are included), wireless communication terminals (including wireless communication base stations here) that have received the same TID data frame Acknowledgment information related to data frames transmitted from the wireless communication terminal of the set partner with the corresponding TID within the range requested by a wireless communication terminal using a BAR frame (sometimes called the Implicit BAR method in which the BAR frame is omitted) Is notified to the wireless communication terminal of the setting partner with a BA frame. Applying this, for example, the wireless communication terminal 201 is configured to use the block communication mechanism for the wireless communication base station 101 and TID = 3, and a series of data frames with TID = 3 are transmitted to the wireless communication base station in ch. Assuming that it is received from the station 101, the wireless communication terminal 201 transmits the delivery confirmation information held for the wireless communication base station 101 to the wireless communication base station 101 as a BA frame after moving to ch.2. The transmission of the BA frame may be performed when the movement to ch. 2 is completed without receiving the BAR frame from the radio communication base station 101 and the frame can be transmitted. This may be the same as that already transmitted to the radio communication base station 101 in ch.1, that is, the frequency channel is changed from ch.1 to ch.2 and the frame is retransmitted. When the wireless communication base station 101 delays the operation of stopping data transmission to the wireless communication terminal 201 while the wireless communication terminal 201 moves from ch.1 to ch.2, the wireless communication terminal 201 There is a possibility that some of the frames from 101 cannot be received due to channel movement, and by confirming which data frame the wireless communication terminal 201 has received by the wireless communication base station 101 by transmitting a delivery confirmation response frame At the same time, it is possible to grasp the state that the wireless communication terminal 201 has been moved to ch.2 and can communicate. Even if the wireless communication base station does not support the above-described operation of stopping data transmission, it is possible to cope with data loss during that time by performing a change completion notification in the BA frame. For example, if the data frame of not only TID = 3 but also TID = 4 was transmitted from the wireless communication base station 101 to the wireless communication terminal 201 in ch.1, the wireless communication terminal 201 has been changed to ch.2. In this case, it is desirable to transmit BA frames for data frames with TID = 3 and TID = 4. In other words, when there are a plurality of data frames that the wireless communication terminal 201 receives from the wireless communication base station 101 by the Block Ack mechanism, exchange of management frames called ADDBA Request frame and ADDBA Response frame at each TID to use the Block Ack mechanism Therefore, it is possible to send BA frames as many as the number of these Block Ack settings (even if no TID frame corresponding to the delivery confirmation response has been received from the wireless communication base station 101). desirable. If these BA frames are transmitted in place of the change completion notification in ch.2, the wireless communication base station 101 uses a single transmission format (aggregation) in the same physical packet. One channel change completion notification can be handled. The wireless communication base station 101 can grasp the data frame to be retransmitted based on this / these BA frames and retransmit it to the wireless communication terminal 201 using ch.2.

  When the wireless communication terminal changes the frequency channel, a mechanism for controlling the timing at which communication can be started on the changed frequency channel may be provided. For example, in FIG. 16, the radio communication terminal 201 transmits a channel change request 1001 and notifies that the communication start or transmission starts at ch.2 after a predetermined time T1 or more. A subfield for writing T1 is provided, and as T1, a time necessary and sufficient for radio communication terminal 201 to move to ch. 2 is written and transmitted. The wireless communication terminal 201 sets the timer to T1 from the completion of transmission of the channel change request 1001 (this can be grasped by the primitive signal PHY_TXEND.confirm of 802.11 specification notified from the PHY unit 4 to the MAC unit 2, for example) Keep moving the timer while moving to ch.2, and access on ch.2 after T1. This is an operation in which frame transmission from the transmission data queue in the MAC unit 2 of the wireless communication terminal 201 is canceled after T1 elapses from the completion of transmission of the channel change request 1001, and access is performed using ch. Alternatively, the PHY access control unit in the MAC unit 2 performs the same recognition that the wireless medium is busy at least for T1 time from the completion of transmission of the channel change request 1001, and is the same as when the wireless medium becomes idle after T1 elapses. It becomes operation that makes you recognize.

  Alternatively, a time sufficient for the wireless communication terminal 201 to move to ch.2 to notify that the communication start or transmission starts in ch.2 after T1 or more after receiving the response frame 1002 May be written as T1 in the Frame Body field of the channel change request 1001 and transmitted. The wireless communication terminal 201 sets the timer to T1 from the completion of reception of the channel change response 1002 (this can be grasped by the primitive signal PHY_RXEND.indication of 802.11 standard notified from the PHY unit 4 to the MAC unit 2, for example) Keep moving the timer while moving to ch2, and access on ch.2 after T1. The access method is the same as described above.

  Alternatively, the time required for the wireless communication terminal 201 to move to ch.2 is notified as T1 in the channel change request 1001, and the channel change is performed when the wireless communication base station 101 receives it and accepts the channel change request. The request response 1002 notifies the channel movement time that the radio communication base station determines to be necessary as T2, and the radio communication base station 101 stops transmission to the radio communication terminal 201 for T2 after 1002 transmission, and ch after T2. The wireless communication terminal 201 may attempt transmission to the wireless communication terminal 201, and the wireless communication terminal 201 may move the channel to ch.2 during T2 after receiving 1002, and start access on ch.2 after T2 or more. When the wireless communication base station 101 determines T2, the time required for the wireless communication base station 101 to prepare for transmitting a frame addressed to the wireless communication terminal 201 on ch.2 (from the transmission queue for ch.1 to the wireless communication terminal (Time for transferring the frame addressed to 201 to the ch.2 transmission queue), and is equal to or greater than the value of T1 from the wireless communication terminal 201. By doing in this way, it is possible to negotiate a switching time sufficient for starting communication in ch. 2 between the radio communication base station 101 and the radio communication terminal 201.

  Or, instead of adding the time required for channel change (the above-mentioned T1 or T2) to the frame related to channel change as described above, it is necessary to start communication between the radio communication terminal 201 and the radio communication base station 101 in advance. It may be set in the frame when setting (for example, in the association process) (for example, notification as Capability in the Association Request frame, negotiation in the Association Response frame, etc.), and the time required for channel movement is Since it is determined uniquely (for example, it is defined as MIB in 802.11), it may be used without being included in the frame. Alternatively, instead of using a specific channel moving time, a unit parameter may be defined so that it can be grasped based on the unit parameter. For example, a parameter corresponding to the actual movement time is specified such that 400 us is indicated as “1” as the channel movement time, and 1.5 ms is indicated as “2”. Or, for example, when Beacon Interval in ch.2 is used as a reference, and Beacon Interval = 2, for example, when Beacon is received twice in ch.2, or the expected Beacon transmission timing (Target Beacon in 802.11) When (Transmission Time (TBTT)) has elapsed twice, the wireless communication terminal 201 transmits the channel change completion notification 1003 in ch.2 or omits the transmission of the channel change completion notification 1003 and performs communication in ch.2. You may make it start.

  In the method of notifying T1, it is possible to grasp in advance how long the wireless communication base station must stop transmission to the wireless communication terminal 201. Therefore, the channel change completion notification 1003 from the wireless communication terminal 201 and the accompanying response 1004 from the wireless communication base station 101 may be omitted. Alternatively, if the wireless communication base station 101 is capable of responding to the one-way channel change time (T1) request from the wireless communication terminal 201, the channel change transmitted from the wireless communication terminal 201 in ch.2 after T1 has elapsed. Based on the notification 1003, it may be possible to transmit a frame addressed to the wireless communication terminal 201 that has stopped transmission until then.

  For example, in a situation where transmission of frames 1002 and 1004 on the response side is expected in a series of frame exchanges from 1001 to 1004, if the wireless communication terminal 201 does not receive these frames, after a certain fixed time elapses The corresponding request frame 1001 or notification frame 1003 may be transmitted to the radio communication base station 101 again.

  When the wireless communication base station 101 receives the channel change request 1001 from the wireless communication terminal 201 (and transmits a channel change response 1002 that permits it), the channel used item corresponding to the wireless communication terminal 201 is shown in FIG. .1 is changed to ch.2 and the information corresponding to ch.2 among the information related to the radio communication terminal 201 of FIG. 14, that is, the radio communication terminal 201 corresponds to 802.11a in ch.2 in FIG. The wireless communication base station 101 communicates with the wireless communication terminal 201 using the 802.11a channel ch.2 (although the wireless communication base station 101 itself supports 802.11a and 802.11n). Thus, in this embodiment, the radio communication base station 101 shares and manages connection information regarding radio communication terminals between frequency channels.

(effect)
In this way, wireless communication that transmits and receives on the current frequency channel by notifying and notifying where the frequency channel corresponding to one radio channel is located and the communication method used by the radio communication base station The terminal can grasp the information. At the time of connection, the wireless communication terminal notifies the wireless communication base station of usable communication methods including other frequency channels, so that the wireless communication base station holds the usable communication methods of the wireless communication terminals permitted to connect together with identifiers. can do. Therefore, when the wireless communication terminal moves to another frequency channel corresponding to the wireless communication base station, the communication method that can be used by the wireless communication terminal is already known, so that communication can be continued. In this case, there is no need for resetting such as once disconnecting the connection and exchanging connection information necessary for communication on the shifted frequency channel.

  Furthermore, when the wireless communication base station transmits a response frame to the request frame from the wireless communication terminal at the time of connection, it is possible to guarantee matching of connection information between the wireless communication terminal and the wireless communication base station.

  By indicating the type of specific communication standard as a communication method to be notified / notified, and the type of extension method within the communication standard, the wireless communication base station and the wireless communication terminal can recognize the communication method among many communication methods. Can be easily matched.

  When the wireless communication base station permits the connection to the wireless communication terminal, the wireless communication base station stores the management number assigned to the wireless communication terminal as an identifier of the wireless communication terminal in the connection management table. The terminal can be identified using a unique identifier, and management of the wireless communication terminal can be simplified.

  By having a queue for storing frames for each frequency channel in the radio communication base station, in response to the frequency channel change request of the radio communication terminal, moving the frame addressed to the radio communication terminal to the corresponding frequency channel transmission queue, A frame addressed to the radio communication terminal can be transmitted through an appropriate frequency channel with which the radio communication terminal moving between the frequency channels communicates.

  The change of the radio communication base station and the radio communication terminal is started when the radio communication base station starts communication with the radio communication terminal on the frequency channel of the change destination after a fixed time or more has passed since the change request of the frequency channel of the radio communication terminal is permitted. It is possible to give a grace to preparations for starting communication on the previous frequency channel. Furthermore, by setting the time to be longer than the time required for the frequency channel movement in the wireless communication terminal, it is possible to guarantee that the wireless communication terminal is ready to receive on the frequency channel to be changed and to start transmitting frames. . If the time required for the frequency channel change from the wireless communication terminal is acquired before permission to change to another frequency channel, the time required for the frequency channel movement in the wireless communication terminal can be accurately grasped, and more By starting communication with the wireless communication terminal on the change destination frequency channel after a lapse of time, it is possible to improve the accuracy of guaranteeing that the wireless communication terminal is ready to receive on the change frequency channel. In addition, by setting the fixed time to be longer than the time required to move between queues of frames addressed to the wireless communication terminal at the wireless communication base station, the frame addressed to the wireless communication terminal is reliably transmitted to the wireless communication terminal using the frequency channel to be changed. can do. Taking these into account, the time until the start of communication in the change-destination frequency channel between the radio communication base station and the radio communication terminal is determined by frame exchange, so that the radio communication base can be reliably used in the change-destination frequency channel. The start of communication after the station and the wireless communication terminal can communicate can be guaranteed.

  Also, if the wireless communication terminal transmits the delivery confirmation information held for the wireless communication base station after moving to another frequency channel to the wireless communication base station, the wireless communication base station determines which frame the wireless communication terminal At the same time that it is possible to confirm whether or not it has been received, it is possible to grasp the state in which the wireless communication terminal has completed the movement of the frequency channel and has become communicable.

  If the wireless communication base station notifies / notifies the bandwidth of another frequency channel, the wireless communication terminal can determine whether the other frequency channel is a bandwidth that can be communicated by the wireless communication terminal. It is possible to guarantee communication on the frequency channel. Also, by providing information that the bandwidth of another frequency channel is an integer multiple of 2 or more to the wireless communication terminal, it is easy for the wireless communication terminal to determine whether another frequency channel is a bandwidth that the wireless communication terminal can communicate with. And it becomes easy to realize a communication method for bandwidth expansion.

  As described above, according to the present embodiment, communication performed while switching each of a plurality of frequency channels or a plurality of communication methods can be performed efficiently.

(Second Embodiment)
The second embodiment will be described focusing on differences from the first embodiment. The difference between this embodiment and the first embodiment is that, in the first embodiment, the standard scheme is simply notified, but in the second embodiment, the modulation code that can be supported by the radio communication base station and the radio communication terminal It is to notify as information including the conversion method.

  FIG. 17 notifies that the wireless communication base station 101 according to the second embodiment uses 802.11a / n as information on the frequency channel ch.2 when transmitting Beacon on the frequency channel ch.1 and ch FIG. 2 is a diagram illustrating notification of a transmission rate corresponding to the case of using 802.11a in .2 and a modulation and coding scheme (Modulation and Coding Scheme; MCS) corresponding to the case of using 802.11n.

  For example, the transmission rate defined as 802.11a is shown in FIG. Modulation method (Modulation) BPSK (Binary Phase Shift Keying) coding rate (Coding Rate) 1/2 Mbps, coding rate 3/4 9 Mbps, Modulation method QPSK (Quadrature Phase Shift Keying) coding rate 1 / 2 12 Mbps, coding rate 3/4 18 Mbps, modulation method 16-QAM (Quadrature Amplitude Modulation), coding rate 1/2 24 Mbps, coding rate 3/4 36 Mbps, modulation method 64-QAM There are 48 Mbps with a rate of 2/3 and 54 Mbps with a coding rate of 3/4. Of these, the ones that are required to transmit and receive if 802.11a is compatible are 6 Mbps, 12 Mbps, and 24 Mbps. This table uses the basic 20MHz channel bandwidth, that is, the transmission rate in the case of 20MHz channel spacing (Channel Spacing), but the transmission rate is halved for each 10MHz channel interval operating in "half-clocked" The transmission rate is 1/4 for each 5 MHz channel interval that operates at “-clocked”, and the required transmission rate is 6 MHz, 12 Mbps, and 24 Mbps at 20 MHz, that is, 10 MHz channel intervals. Is 1.5 Mbps, 3 Mbps, and 6 Mbps when used at 3 Mbps, 6 Mbps, 12 Mbps, and 5 MHz channel intervals. Information about the channel interval is included in the Country Information element as a Regulatory Class, and is included in the Beacon frame and the Probe Response frame. In 802.11a, as a Supported Rates element (or an Extended Supported Rates element if it does not fit in it), what transmission rate (including wireless communication base stations) wireless communication terminals (including wireless communication base stations) can send and receive and which transmission rate can be received at least ) In the frame body field of the frame (Association Request, Association Response) exchanged in the Association process, the partner terminal (including the wireless communication base station) is notified. The BSS also includes a Supported Rates element in the Beacon and Probe Response frames to indicate which transmission rate must be sent and received at least and which transmission rate must be received. It is transmitted to the wireless communication terminal as request information. The same information for configuring BSS in ch.2 is also notified when notifying that 802.11a can be used in ch.2 in Beacon of ch.1 and also in Probe of ch.1 Notification is made when notifying that 802.11a can be used in Response ch.2.

  The relationship between the MCS defined as 802.11n and the transmission rate in the 20 MHz channel band is as shown in FIG. 19 (all are not shown and omitted after the MCS index 9). Each MCS is distinguished by an MCS index (Index), and a supported MCS Set field indicates which MCS a wireless communication terminal (including a wireless communication base station) can transmit and which MCS can receive. The Supported MCS Set field is entered in the Frame Body field of a frame (Association Request, Association Response) exchanged in the Association process and notified to the partner terminal (including the wireless communication base station). The Supported MCS Set field is also included in the Beacon frame and Probe Response frame in order to inform the wireless communication terminal which MCS can be received by the wireless communication base station and which MCS can be transmitted. In addition, 802.11n indicates which MCS is supported as a BSS (that is, whether it must be able to transmit and receive) in the Beacon frame and Probe Response frame as a Basic MCS Set field. In 802.11n, the relationship between MCS and transmission rate is not unique as in 802.11a, and the transmission rate can be obtained by adding channel band information (20 MHz is required, 40 MHz is optional). The information of the Supported MCS Set field and the Basic MCS Set field used in 802.11n in ch.2 is notified together with the fact that 802.11n can be used in ch.2 in the beacon of ch.1. As described above, if information about the channel bandwidth in ch.2 is also reported by the Beacon of ch.1 or is uniquely determined by the channel identifier of ch.2, etc. The radio communication terminal 201 can grasp in advance ch.1 the transmission rate that can be used when the communication base station 101 performs transmission / reception using 802.11n in ch.2.

  On the other hand, when the wireless communication terminal 201 is connected to the wireless communication base station 101 in ch.1, the association request frame can be used to support 802.11a in ch.2, and the Supported Rates element in ch.2. By entering information, it notifies which transmission rate can be transmitted and received when using 802.11a in ch.2 and which transmission rate can be received.

  For example, when wireless communication terminal 201 transmits an Association Request frame using ch.1 using 802.11g, 6 Mbps, 12 Mbps, and 24 Mbps can be transmitted and received in the Supported Rates element information as ch.1, and 36 Mbps and 54 Mbps can be received. In the same way, it is notified that it is compatible with 802.11a as ch.2, and that supported rates element information as ch.2 can be transmitted and received at 6 Mbps, 12 Mbps, and 24 Mbps, and can be received at 36 Mbps and 54 Mbps. Another wireless communication terminal 202 transmits / receives all transmission rates of 6 Mbps, 9 Mpbs, 12 Mpbs, 18 Mbps, 24 Mbps, 36 Mbps, 48 Mbps, 54 Mbps to and from the Supported Rates element information of ch.1 802.11g and ch.2 802.11a. MCS from 0 to 32 can be sent and received in the Supported MCS Set field information in 802.11n of ch.2 and MCS 33 and 34 can be received and the radio communication base station 101 in ch.2 can be received. Assume that you are currently communicating. In this case, for example, FIG. 20 is used instead of FIG. The wireless communication base station 101 uses at least a transmission rate that can be received by the wireless communication terminal 201 when transmitting to the wireless communication terminal 201 at a transmission rate that can be transmitted / received by the terminal itself, and at least wireless communication when transmitting to the wireless communication terminal 202 A transmission rate that can be received by the terminal 202 is used. For example, if the wireless communication base station 101 cannot transmit 54 Mbps in the first place, 54 Mbps in each item of FIG. 20 is deleted. You may do it.

  On the wireless communication terminal 201 side, the information contained in the Beacon or Probe Response frame from the wireless communication base station 101 is, for example, the transmission rate that can be transmitted and received in common with respect to 802.11g of ch.1 and 802.11a of ch.2 is 6 Mbps, Assuming that 12 Mbps, 24 Mbps, 36 Mbps, and receivable transmission rates are 9 Mbps, 18 Mbps, 48 Mbps, a connection management table as shown in FIG. 21 is created instead of FIG. 15 of the first embodiment. The wireless communication terminal 201 transmits a frame addressed to the wireless communication base station 101 using a transmission rate at which the wireless communication base station 101 can receive at least a transmission rate at which the terminal itself can transmit and receive. For example, when the wireless communication terminal 201 is based on FIG. 20, 9 Mbps, 18 Mbps, and 48 Mbps cannot be transmitted in the first place. It is also possible to simply put necessary and sufficient information in the management list.

  In the above example, the information of the Supported Rates element that can be used in 802.11a together with the information that supports 802.11a is included in the information of the Supported MCS Set field that can be used in 802.11n together with the information that supports 802.11n. However, it indicates that ch.2 is 5 GHz band and conforms to the 802.11 standard (including the extended method) (or does not have to indicate that it can be expected if known). , 802.11n information and Supported MCS Set field information may be included without including 802.11n information. If you comply with the 802.11 standard in the 5 GHz band, you can see that it shows the transmission rate that can be used in 802.11a just by grasping the information of the Supported Rates element, and just knowing the information of the Supported MCS Set field This is because it can be seen that n indicates an MCS that can be used.

  If the information is common across frequency channels, the information may be shared and notified or information in the connection management table may be collected. For example, in the examples of FIG. 20 and FIG. 21, since the information of the Supported Rates element is the same in both 802.11a and 802.11g, the information is applied to ch.1 and ch.2 as information of one Supported Rates element. Notification may be made, and FIG. 20 itself may be integrated into one item.

  Here, when the wireless communication terminal 201 transmits the change request 1001 to ch.2, the wireless communication base station 101 sets the transmission rate / MCS requested for transmission / reception in ch.2 and at least the transmission rate / MCS requested for reception. Whether or not the wireless communication terminal 201 is compatible is checked with respect to the item of the wireless communication terminal 201 in the connection management table of FIG. When the wireless communication terminal 201 is ch.2 and supports the transmission rate / MCS at which the wireless communication base station 101 requests transmission / reception and at least the transmission rate / MCS at which reception is requested, the wireless communication base station 101 connects the wireless communication terminal 201 to the ch. A channel change response 1002 that permits a change request to .2 is transmitted. If the wireless communication terminal 201 does not support either the transmission rate / MCS at which the wireless communication base station 101 requests transmission / reception at ch.2 or at least the transmission rate / MCS at which reception is requested, the request to change to ch.2 is rejected This is notified in the channel change response 1002.

(effect)
In this way, by notifying and notifying the modulation and coding method as a communication method used in another frequency channel, the level of the communication method corresponding to the communication partner is more specifically grasped at the wireless communication base station and the wireless communication terminal. It is possible to select an appropriate transmission method according to the communication partner. Furthermore, by notifying the wireless communication base station of the communication method that can be received by the wireless communication terminal, the communication method that can be received is different from the communication method that can be transmitted. When the range is wide, the selection range of the communication method addressed to the wireless communication terminal from the wireless communication base station can be expanded. Further, by notifying the wireless communication base station of the communication method that can be received and transmitted by the wireless communication terminal, the wireless communication base station can transmit using the communication method that can be received by the wireless communication terminal. Can be used as information when performing adaptive control by grasping the communication method that can be transmitted, and the reception method at the wireless communication base station by narrowing down the communication method of the frame transmitted from the wireless communication terminal Can be made easier to deal with.

  Furthermore, a wireless communication terminal permitted to connect on a certain frequency channel holds a modulation and coding scheme that can be used on another frequency channel together with the identifier of the wireless communication terminal, thereby requesting a change from the wireless communication terminal to another frequency channel. Can be determined whether or not the modulation and coding scheme that can be used by the wireless communication terminal satisfies the usage condition in another frequency channel. Communication on another frequency channel can be guaranteed, and then the wireless communication terminal can be moved between corresponding frequency channels of the wireless communication base station without once disconnecting from the wireless communication terminal. .

(Third embodiment)
The third embodiment will be described focusing on differences from the second embodiment. The difference between the second embodiment and the second embodiment is that in the second embodiment, the transmission rate and the MCS are notified or notified, but the wireless communication terminal uses the other information, that is, ch. The point is that information necessary for communicating with the station is also notified or notified.

  Each 802.11a / g / n has information necessary for starting data exchange in addition to the transmission rate and MCS. For example, various functions such as an optional function in the PHY layer and an optional function in the MAC layer are notified and notified. In this embodiment, the radio communication base station 101 transmits these various functions related to ch.2 in ch.1 in a Beacon or Probe Response frame and transmits them in an Association Request frame in the radio communication terminal 201. To do.

  For example, a Beacon frame is broadcast with information as shown in FIG. 22 in order to configure a BSS with ch. Although each information in FIG. 22 is shown in the order in which it is described, it is not always necessary to describe all of this information, and only necessary information may be included. In FIG. 22, all information is not listed. The probe response frame returned to the transmission destination wireless communication terminal when receiving the probe request frame also contains the same information as the beacon frame. By receiving these pieces of information, the wireless communication terminal obtains information necessary for connecting to the wireless communication base station in ch. For example, in the second embodiment, the case where the information in ch.2 is entered for the Supported Rates element shown in FIG. 22 has the configuration shown in FIG. 23 and includes 802.11n (High Throughput; HT) -related Capability information, but the information in ch.2 is input regarding the Supported MCS Set. The case described. In this embodiment, information other than the transmission rate / MCS related to other frequency channels supported by the radio communication base station is also transmitted on the frequency channel transmitting this Beacon / Probe Response frame. For example, the Capability element in FIG. 22 has a configuration as shown in FIG. 24, the HT Capabilities element has a configuration as in FIG. 23, and the HT Information element has a configuration as in FIG. Although these include information other than the transmission rate and MCS described above, these pieces of information when using ch.2 are transmitted using ch.1.

  For example, whether or not the wireless communication base station 101 in FIG. 6 supports QoS is indicated by the QoS bit in the Capability Information field in 802.11, and whether or not it supports polling and how it corresponds in 802.11 is based on the Capability Information field. The QoS channel, the CF-Pollable bit, and the CF-Poll request bit are shown in combination. These are included as correspondence information in

  In addition, when the wireless communication terminal 201 exchanges a frame for setting in ch.1 to connect to the wireless communication base station 101, the information to be notified when performing communication by connecting in ch.2 ch. Enter together with the information for connection in 1. For example, in the Association Request frame, information as shown in FIG. 26 is inserted in order to connect to the radio communication base station using ch. Each information in FIG. 26 is shown in the order in which it is described. However, not all the information must be described, and only necessary information can be entered. In FIG. 26, all information is not listed. For example, in the second embodiment, the case where the information in ch.2 is entered for the Supported Rates element shown in FIG. In addition, the HT Capabilities element in FIG. 26 includes information as shown in FIG. 23, but the case where information in ch.2 is entered regarding the Supported MCS Set therein is described. In the present embodiment, similar information regarding the other frequency channel (ch.2) supported by the wireless communication terminal is also transmitted on the frequency channel (ch.1) transmitting the Association Request frame. For example, the Capability element in FIG. 26 includes information as shown in FIG. 24, the HT Capabilities element as shown in FIG. 23, and the HT Information element as shown in FIG. This information is included when transmitting the Association Request frame in ch.1. The Association Response frame also includes a Capability element, HT Capabilities element, and HT Information element in addition to the Supported Rates element and Extended Supported Rates element. In the same way, the wireless communication terminal 201 can connect to the wireless communication base station 101 in ch.2 and confirm the attribute of the wireless communication base station 101 again as information necessary for communication under the BSS. it can. These pieces of information are held in the connection management table in each of the wireless communication base station and the wireless communication terminal.

  The simplest method is the information necessary to communicate with ch.2 for each of the Beacon frame, Probe Response frame, Association Request frame, and Association Response frame for ch.1 (channel identifier, required Depending on the center frequency and channel bandwidth). For example, in the case of a Beacon frame, the format of the Beacon frame for ch.1 is entered, then information on ch.2 itself is entered, and the format of the Beacon frame for ch.2 is entered. The information part of the Beacon frame for ch.1 and the information part of the Beacon frame for ch.2 (the part that combines the information about ch.2 itself and the format of the Beacon frame for ch.2) are separate from the MAC frame. As a PHY frame, it may be aggregated into one frame, separated as a MAC frame or a PHY frame, transmitted, or treated as a single MAC frame and transmitted. Also good.

  Also, essential functions that span frequencies may be omitted, and an optional function may be notified.

  A function that can be shared across frequency channels (for example, QoS support is supported by all frequency channels) is shared, and a function that differs depending on the frequency channel is notified for each frequency channel. Good.

  The wireless communication base station 101 can also change the provided service, for example, by adjusting the access parameters according to the traffic type of communication for each frequency channel or by limiting the applications to be used. The service policy of the radio communication base station in each frequency channel may be notified using a Beacon frame / Probe Response frame or the like. The radio communication terminal (in this case, radio communication terminal 201) may determine the change of the frequency channel in consideration of the service policy in each frequency channel notified by the radio communication base station 101. On the other hand, the radio communication base station 101 may determine permission / rejection for the channel change request of the radio communication terminal 201 depending on whether or not the service policy on the frequency channel to which the change request is made can be maintained. For example, if the wireless communication terminal 201 can be expected to limit the bandwidth (throughput) of AV transmission in ch.2 by moving to ch.2, the wireless communication terminal 201 rejects the request to change to ch.2. . In addition, when the wireless communication terminal 201 requests channel change, the wireless communication base station 101 notifies the service to be used on the requested frequency channel, and the wireless communication base station 101 permits this by comparing it with the support service on the requested frequency channel. You may make it decide / rejection. For example, the radio communication base station 101 provides ch.2 for AV transmission, and if the radio communication terminal 201 notifies that it wants to perform VoIP transmission when requesting change to ch.2, it rejects it because it is not AV transmission.

(effect)
By notifying each other at the radio communication base station and the radio communication terminal up to information on each function in the communication method necessary for performing connection in a frequency channel other than the frequency channel currently performing communication in this way, After the wireless communication terminal has moved to another frequency channel corresponding to the wireless communication base station, it is not necessary to perform settings related to each function in ch.2, and communication using each function can be started immediately.

(Fourth embodiment)
The fourth embodiment will be described focusing on points added to the first to third embodiments. This embodiment adds to the first to third embodiments in that information necessary for connection on the frequency channel is notified on a plurality of frequency channels corresponding to the radio communication base station.

  FIG. 27 is a diagram in which the radio communication base station 101 according to the present embodiment transmits a Beacon frame using two frequency channels ch1 and ch.2. In the first to third embodiments, information on ch.2 is included in the Beacon frame transmitted in ch.1, but in this embodiment, the Beacon frame is also transmitted in ch.2 and information on ch.2 is input. Information on ch.1 may be broadcast on ch.2. Of course, if a Probe Request frame is received from the wireless communication terminal in ch.2, information on ch.2 is inserted when returning a Probe Response frame. Further, the information of ch.1 may be included in the Probe Response frame transmitted by ch.2.

  In FIG. 27, only the information of ch.2 is displayed in the Beacon frame transmitted by ch.1, but in order for the wireless communication terminal to establish connection with the wireless communication base station 101 by ch.1 as described above. It is obvious that ch.1's own information is put in the Beacon frame transmitted by ch.1.

  As a result, the wireless communication base station 101 can make other wireless communication terminals (including wireless communication base stations) know that it is also active in ch.2, and measures to avoid interference with other wireless communication terminals I can expect. The wireless communication terminal can be grasped as a connection candidate because the wireless communication base station 101 is active in ch.2.

  On the other hand, if the wireless communication base station 101 does not want to accept a new connection of a wireless communication terminal in ch.2 (accepting connection requests is restricted to ch.1, ch.2 is a channel change from ch.1 (For example, when only receiving), a frame that is not a Beacon frame as a frame for broadcasting ch.2 information in ch.2 does not respond to the Probe Request frame, but for other similar frames in other frames BSS information can be returned as a response. That is, a frame of the Subtype field that is not recognized by an existing wireless communication terminal (hereinafter referred to as “legacy terminal”) not compatible with the present invention is used. For example, in an IEEE802.11 wireless LAN, a frame whose Subtype field is {B4, B5, B6, B7} = {0, 0, 0, 1} is a Beacon frame and a legacy terminal is also a wireless communication terminal (wireless (Including communication base stations), but a new subtype different from this is defined as a management frame for broadcasting BSS information in ch.2. It is not defined in the IEEE802.11 wireless LAN standard stage when the legacy terminal is compliant, but uses one of the reserved subtype fields (subtype 1 for convenience). As a result, when the wireless communication terminal according to the embodiment of the present invention receives the management frame of the new Subtype 1, it recognizes that it reports BSS information instead of the Beacon frame in ch.2, and further establishes a new connection in ch.2. Know that you will not accept. If the management frame of Subtype 1 transmitted in ch.2 indicates that a new connection is accepted in ch.1, radio communication terminal 201 moves to ch.1 and connects to radio communication base station 101. Exchange of Authentication frame and Association frame for setting can be started. Legacy terminals do not receive the Beacon frame, so cannot detect the wireless communication base station 101, and cannot recognize even if a new management frame of Subtype 1 is received, so it is recognized by filtering in the Subtype field when receiving in the MAC part Common if the frame is judged as a frame that can not be recognized and the contents of the Frame Body field are discarded (that is, it is not recognized as a connection destination candidate as when receiving Beacon just because Subtype 1 is received) Wireless communication that transmits a frame from the power management bit (denoted as Pwr Mgt in FIG. 8) of the MAC header part Frame Control field, which determines whether the NAV is set from the address field part and Duration / ID field of the MAC header part Whether the terminal is in power save mode or active mode (in this case, it is wireless communication base station 101 and is always active since it is a base station) Etc.). As a result, the legacy terminal does not attempt to connect to the radio communication base station 101. If Subytpe 2 is used instead of the Probe Request frame and Subtype 3 is used instead of the Probe Response frame in ch.2, even if the wireless communication base station 101 receives the Probe Request in ch.2, the Probe Response frame is transmitted. The legacy terminal does not transmit and cannot acquire information related to the BSS from the radio communication base station 101 in ch.2 and cannot find the radio communication base station 101, so the connection is not attempted. The wireless communication terminal 201, which is the wireless communication terminal, can acquire BSS information in ch.2 because the wireless communication base station 101 responds to the management frame of Subtype 2 with a management frame of Subtype 3. If the information of ch.1 is also included in the Subtype 3 management frame and ch.1 indicates that a new connection is accepted, the wireless communication terminal 201 moves to ch.1 and connects to the wireless communication base station 101. Exchange of Authentication frame and Association frame for setting can be started. In addition, by using a frame that cannot be understood by the legacy terminal, the legacy terminal cannot grasp that the wireless communication base station 101 is operating in ch.2 and cannot be connected in ch.2, but according to the embodiment of the present invention The wireless communication terminal can also restrict the connection in ch.2 such as detecting and connecting to the wireless communication base station 101 by using new frames such as Subtypes 1, 2, and 3 in ch.2.

(effect)
In this way, by notifying / notifying the communication system or modulation and coding system used in another frequency channel by the other frequency channel itself, other radio communication base stations or radios that can be received on the other frequency channel. It is possible to make the communication terminal recognize what communication method or modulation and coding method the wireless communication base station uses on the other frequency channel.

  Furthermore, by recognizing the above, other wireless communication base stations and wireless communication terminals can take measures to avoid interference.

  Furthermore, by recognizing the above, the wireless communication terminal can be a candidate for a wireless communication base station to which the wireless communication base station is connected.

  In addition, by using a frame that cannot be grasped by an existing wireless communication terminal that does not correspond to the present invention, it is possible to restrict connection on the other frequency channel.

(Fifth embodiment)
The fifth embodiment will be described focusing on the points added to the fourth embodiment. This embodiment adds to the fourth embodiment when the information necessary for connection in the frequency channel is notified on the plurality of frequency channels corresponding to the wireless communication base station, and the information extends over the frequency channels. This is a point indicating that they are the same radio communication base station.

(When using BSSID)
(For a single BSSID)
For example, in IEEE802.11 wireless LAN, a BSS is composed of a wireless communication base station and a wireless communication terminal connected to it. The identifier of the BSS is called BSSID (Basic Service Set IDentification). MAC address. For example, a wireless communication base station configured as shown in FIG. 3 may have one MAC address. In this case, as shown in FIG. 28, information on ch.2 is put in the Beacon frame transmitted by ch.1 and ch.2, and the Beacon frame transmitted by these different frequency channels is transmitted from the same radio communication base station. Enter a common BSSID to indicate that it is.

  When a wireless communication base station transmits a Beacon frame in IEEE802.11 wireless LAN, the BSSID is entered in the Address 3 field in the MAC header of FIG. 7, where each of ch.1 and ch.2 One method is to put the same 48-bit BSSID value in the Beacon frame.

  In such a case, when the information scanned on the frequency channel by the wireless communication terminal is aggregated, it is necessary to also hold information on which frequency channel the information is acquired. In IEEE802.11 wireless LAN, when scanning, the information of each BSS is collected as BSSDescription, notified to SME, which BSS is connected by SME, and frame exchange for actual connection setting is performed in MAC layer. In the case of the above-described embodiment, the frequency channel identifier is added as shown in FIG. 29 as the BSSDescription so that the information obtained by which frequency channel is obtained can be grasped.

(For multiple BSSIDs)
On the other hand, BSSIDs are usually uniquely determined by MAC addresses in radio communication base stations, but in radio communication base stations configured as shown in FIG. 3, different frequency channels and associated access control units are grouped together. A different BSSID may be assigned to each frequency channel. That is, in FIG. 3, when transmitting a frame through the PHY1 access control unit 31, the PHY1 processing unit 33, and the first frequency conversion circuit 35, the BSSID is set to BSSID 1, the PHY2 access control unit 32, the PHY2 processing unit 34, the frequency When transmitting a frame through the conversion path 2, the BSSID is BSSID 2. The plurality of BSSIDs are managed by a MAC layer management unit 30 that manages a plurality of frequency channels in common. The BSSID value itself may be specified outside the MAC layer management unit 30, for example, by external input, or may be uniquely assigned by the MAC layer management unit 30.

  In this case, in the Beacon frame in ch.1, put BSSID 1, which is the BSSID of ch.1, in the Address 3 field of the MAC header, and the BSSID in ch.2 along with the information of ch.2 in the Frame Body field If the BSSID 2 is entered in the Beacon frame of ch.2 and the BSSID 2 of the ch.2 BSSID is entered in the Address 3 field of the MAC header, the wireless communication terminal 201 changes from ch.1 to ch.2. When the frequency channel is changed, the Beacon frame of ch.2 is received, and it can be confirmed from the information notified in ch.1 that the Beacon frame is transmitted by the same radio communication base station. Of course, in the Beacon frame transmitted on each frequency channel, the information in ch.1 and the BSSID in ch.1 are set to BSSID 1 in the Frame Body field of the Beacon frame in ch.2. Information on other frequency channels may be notified to each other including the BSSID used there. In this case, FIG. 30 is obtained. Note that the order in which information on other frequency channels is described is not limited to this.

  In the IEEE802.11 wireless LAN, in addition to the BSSID, there is also an SSID (Service Set Identifier) as described in FIGS. This is an ESS (Extended Service Set) identifier that consists of multiple BSSs and is recognized as one BSS in LLC. For example, it indicates a system by the same operator (and in some cases providing the same service) It can be said that this is an identifier. With respect to this SSID, the above two examples (one BSSID may be used or a plurality of BSSIDs are used) may be set to the same SSID value. Also, for example, the supported traffic types for ch.1 and ch.2 are different, or the priority traffic types are different (can be done by adjusting access parameters), or the corresponding applications are limited (for example, ch. The SSID value may be changed between ch.1 and ch.2 if there is a difference in support services, such as 2 is used only for video transmission.

(effect)
In this way, by notifying the identifier of the radio communication base station on another frequency channel, it is possible to notify that the same radio communication base station is operating on a plurality of frequency channels.

  Further, the wireless communication terminal that communicates with the wireless communication base station on a certain frequency channel, changes to another frequency channel, and communicates with the wireless communication base station again recognizes the wireless communication base station, and the frame is transmitted to the wireless communication base station. It can be transmitted to the communication base station.

(Sixth embodiment)
The sixth embodiment will be described focusing on differences from the fifth embodiment. The fifth embodiment differs from the fifth embodiment in that the fifth embodiment shows that the same radio communication base station is used using the BSSID, whereas in the present embodiment, an identifier different from the BSSID is used. It is the point which is provided separately and shows that it is the same wireless communication base station.

  For example, a legacy terminal of IEEE802.11 wireless LAN does not grasp information to be added according to the embodiment of the present invention. Further, it is not expected to use the information management method as shown in this specification. As described in the fifth embodiment, since information is aggregated for each BSSID as a BSSDescription, when a notification method using a single BSSID of the fifth embodiment is used, a legacy terminal uses a plurality of frequency channels. Therefore, it is impossible to distinguish the information of the Beacon frame or Probe Response frame received from the same radio communication base station, and further, it is not possible to recognize the information related to different frequency channels according to the embodiment of the present invention. Legacy terminals recognize the frame type (up to the Subtype level) and the field position where information is stored in the frame is uniquely determined (field start point fixed, field length fixed), or field position is determined. Even if there is no information, a field in which an identifier (Element ID) is inserted, a field indicating a field length (Length), followed by a variable-length information field (as shown in FIG. 23) When it goes up from the PHY layer to the MAC layer, it performs the desired processing (extracts each information element and reflects it in future MAC processing). Portions that cannot be recognized by such a method are not reflected in subsequent processing, such as being discarded at the MAC layer. Therefore, the Beacon frame and Probe Response frame can be understood by legacy terminals, and if the address 3 field is used in the case of a single BSSID notification method, it can be understood, and the same frame and the same information are received by multiple channels. That's right. If the design is not designed to anticipate such a situation, there is a possibility of problems in the internal operation of legacy terminals.

  Therefore, in this embodiment, the BSSID used in each frequency channel is assigned a different value (as in the latter half of the fifth embodiment) (in the latter half of the fifth embodiment, the frame body of the Beacon and Probe Response frames). Unlike the BSSID for other channels in the field), a new field that can be understood by the wireless communication terminal according to the embodiment of the present invention is provided in the Frame Body field of the Beacon and Probe Response frames. For example, a common identifier called Multi-channel ID (MC ID) is entered in the Frame Body field of the Beacon and Probe Response frames transmitted in ch.1 and ch.2, respectively, as shown in FIG. Since the legacy terminal cannot recognize this, even if the frame is received, the information is not processed and no adverse effect occurs. The wireless communication terminal according to the embodiment of the present invention can understand the MC ID, and even if different BSSID Beacon and Probe Response frames are received on different frequency channels, the same wireless communication base is used as long as the field value of this MC ID is common. It can be understood that it is a station. The wireless communication terminal 201 that has moved to ch.2 recognizes the Beacon frame and Probe Response frame transmitted from the MC ID in ch.2 of the wireless communication base station 101, and from the Beacon frame and Probe Response frame to the wireless communication base station in ch.2. The BSSID (BSSID 2) used by 101 is acquired, and the BSSID 2 is used in subsequent communications. Alternatively, the MC ID may be inserted into the MAC header portion of a frame to be transmitted by the wireless communication base station 101 and the wireless communication terminal 201, for example. The MC ID may be inserted only in ch.2 or may be included in a frame transmitted in all frequency channels (here, ch.1 and ch.2) that are targets in the embodiment of the present invention. . The wireless communication terminal 201 can grasp that the frame having the corresponding MC ID is transmitted from the wireless communication base station 101.

(effect)
In this manner, a field different from the field indicating the identifier of the radio communication base station used in the radio communication base station capable of communicating only with a single frequency channel is notified that the same radio communication base station is provided over a plurality of frequency channels. Thus, when the notification is received by a wireless communication terminal that can be connected only to a wireless communication base station that can communicate only with a single frequency channel, it can be recognized as another wireless communication base station and can be connected. In addition, a wireless communication terminal that can be connected to a wireless communication base station that can communicate with a plurality of frequency channels can be recognized and connected as the same wireless communication base station.

(Seventh embodiment)
The seventh embodiment will be described focusing on points added to the third to sixth embodiments. This embodiment adds to the third to sixth embodiments that the wireless communication base station 101 can transmit simultaneously when transmitting a frame whose destination address is a group address, such as a broadcast frame or a multicast frame. To transmit on all frequency channels.

  That is, when the configuration as shown in FIG. 6 is adopted, the radio communication base station 101 can transmit at the same time in ch.1 and ch.2 (actually, the conditions for obtaining the access right are different and the simultaneous transmission is not performed). Therefore, a group address frame is transmitted on these two channels. In other words, for radio communication base station 101, ch.1 and ch.2 are frequency channels that can be received simultaneously, so that it can be said that group address frames are transmitted on all frequency channels that can be transmitted and received simultaneously. .

  In a normal IEEE802.11 wireless LAN, a field for indicating the order of frames when a frame is transmitted is provided. Although this order is put in the Sequence Control field of FIG. 7, this Sequence Control field is divided into a Fragment Number field and a Sequence Number field as shown in FIG. The Sequence Number field is MSDU (MAC Service Data Unit: a frame generated from data passed from the upper layer of the MAC layer, for example, the LLC layer. It becomes a data frame) or MMPDU (MAC Management Protocol Data Unit: This is a field indicating the sequence number of a frame generated to move (becomes a management frame), that is, the frame order. This sequence number is assigned to a traffic identifier (TID: Traffic Identifier) and a modulo-4096 counter for each receiving terminal when the wireless communication terminal distinguishes the QoS type in IEEE802.11 wireless LAN, and increments by one. . When transmitting a management frame, a QoS frame, but a group address frame, or a non-QoS frame, the difference between these frames is not distinguished. In addition to the previously prepared counters, another modulo-4096 counter is allocated for these and incremented by 1 each time the corresponding MSDU and MMPDU frames are transmitted. In the case of a transmission configuration in which the wireless communication terminal does not distinguish QoS types, one modulo-4096 counter is used and incremented by 1 for each MSDU or MMPDU. The Fragment Number field shown in FIG. 32 is a field indicating the fragment number, that is, the order of fragments when a single MSDU or MMPDU is divided into units of short frame length called fine fragments and transmitted (this is called fragment processing). Fragment processing can be divided into a maximum of 64. A value from 0 to a maximum of 63 is assigned to each fragment in the Fragment Number field. When fragmented with the same MSDU or MMPDU, the same value is entered in the Sequence Number field, and the order of the fragments is written in the Fragment Number field.

  In IEEE802.11 wireless LAN, when a wireless communication terminal (including a wireless communication base station) receives a frame, it checks from the address field of the MAC header as a reception operation whether the frame is addressed to itself. Because the address of the direct destination terminal is described in the Address 1 field of the MAC header and the frame is to be transmitted, the wireless communication terminal compares the Address 1 field with the MAC address of its own If it is determined that it is destined for its own terminal and the selective retransmission method is used, if it is a fragmented frame, it is arranged in the order of fragments and after one MSDU / MMPDU is prepared, it is converted to the MSDU / MMPDU format without fragments (this is the default). The order of received frames is rearranged in the order of the Sequence Control field (referred to as fragment processing) and passed to the upper layer of the MAC layer, for example, the LLC layer, or to the MAC layer management unit 30 if it is a management frame. In response to this, a desired operation is performed based on the determination through the SME. If a frame with the same sequence number (or a frame with the same fragment number if it is a fragment processed frame) is received from the same wireless communication terminal, it is discarded as duplicated. In this case, if the frame requests an ACK response, the ACK frame is transmitted after SIFS has elapsed after reception, regardless of duplication. If it is determined that it is not addressed to the terminal itself, the frame is discarded, and a NAV (Network Allocation Vector) is set based on the Duration / ID field (shown as Dur / ID in FIG. 7) (written in the Duration / ID field). The media is recognized as busy at the MAC layer for the time that is given, that is, the virtual carrier sense is activated).

  In the case of a frame of group address, the group address is described in the Address 1 field, but when it is received, it is described in the MAC header in the wireless communication terminal of IEEE802.11 wireless LAN connected to the wireless communication base station through the association process. The extracted BSSID (Address 3 field in FIG. 7 if it is a management frame, or Address 2 field in FIG. 7 when the data frame is transmitted from the wireless communication base station to the subordinate wireless communication terminal, for example) is extracted. If it is determined that it is the same as the BSSID of the BSS to which the wireless communication terminal belongs, and if it is determined to be the same (in the multicast frame, determine whether it is a multicast including its own terminal, and if so) in the MAC layer Desired processing (extract the Frame Body field part and pass it to the upper layer, or pass it to the MAC layer management part 30 and perform the desired operation via SME if necessary) Done, discard the frame otherwise. In the case of a group address frame, an ACK frame is not transmitted after SIFS even if the group address includes its own terminal. When frames with the same sequence number are received from the same wireless communication terminal, discarding is the same as with unicast frames. When the same group address is received from a plurality of wireless communication terminals with a configuration such as a mesh, a frame corresponding to a transmission address of a data generation source and a sequence number on the mesh network, for example, is provided in the frame. Therefore, it is determined whether the information is duplicated and discarded.

  Here, when the single BSSID in the fifth embodiment indicates the same radio communication base station, the radio communication terminal 201 receives the group address frame 1 on ch.1, and then ch.2 When the group address frame 1 is received again (due to the access right acquisition of the wireless communication base station 101, etc.), the field describing the BSSID in the MAC header is the MAC address of the wireless communication base station 101 in both frames. This is true because it is the same, but since the sequence number is the same, the group address frame 1 in ch. 2 received later is discarded. When a conventional wireless communication terminal changes the channel, even if frames transmitted on multiple frequency channels are from the same wireless communication base station, it will be understood if notified by an unsupported field I can't do it. Therefore, in this embodiment, since the field for describing the existing BSSID and the field for describing the sequence number are used as in the existing application, even in the case of a conventional wireless communication terminal not corresponding to the present invention, the group address frame Duplicates can be detected and discarded at the MAC layer.

  In the fifth embodiment, in the method of notifying (notifying) the BSSID used in the frequency channel that operates in the frequency channel that operates while providing a plurality of BSSIDs, the radio communication terminal 201 uses the ch.1 group address Receiving frame 1 and then moving to ch.2 and receiving group address frame 1 again (due to the access right acquisition of wireless communication base station 101, etc.), the BSSID in the MAC header is described in two frames Although the fields are different, since the BSSID used in ch.2 is known in advance by the wireless communication terminal, the group address frame 1 received in ch.2 is also subject to processing by the MAC. In addition, since the sequence numbers are the same, it is understood that they are the same group address frame transmitted from the same radio communication base station, and the group address frame 1 in ch.2 received later is discarded. become. Similarly, when the MC ID is used in the sixth embodiment, the MC ID is put in the group address frame (for example, the MC ID is put in the Frame Body field for the management frame, and the MAC header is used for the data frame). (The field to enter the MC ID is provided in the part etc.) The group address in ch.2 received later can be grasped that the wireless communication terminal 201 is the same group address frame transmitted from the same wireless communication base station Frame 1 can be discarded. On the other hand, in these methods, even if the same group address is received in a plurality of frequency channels, the legacy terminal cannot grasp that they are transmitted from the same radio communication base station and can be discarded due to duplication. . Therefore, it depends on the method of identifying and discarding in a layer higher than the MAC layer on the wireless communication terminal side, or the legacy terminal changes the frequency channel on the wireless communication base station side, and the wireless communication base station When connected, it is necessary not to transmit the same group address repeatedly.

  As described above, in order to reduce duplicate reception of group addresses when there is a frequency channel movement in the wireless communication terminal, the timing of the frequency channel movement of the wireless communication terminal accommodated in the wireless communication base station is grasped and its operation It is desirable to send after waiting for completion. When the frequency channel movements of a plurality of wireless communication terminals overlap, it is desirable to wait for all of the wireless communication terminals to complete the movement. In addition, regarding the group address frame, there is also a request that the wireless communication terminal in the low power consumption mode (Power Save mode) understands and transmits it in the IEEE802.11 wireless LAN. Then, the group address frame is transmitted. As described above, when the legacy terminal changes the frequency channel, the radio communication base station cannot know in advance when to change the frequency channel and when to connect to the radio communication base station using the new frequency channel. Therefore, in order to control the MAC layer so that the group terminal frame is not transmitted again to the legacy terminal when the wireless communication base station 101 recognizes that the legacy terminal has moved from ch.1 to ch.2 and has been connected. Provides a multicast address frame addressed to a wireless communication terminal compatible with the conventional method and a multicast address frame addressed to the wireless communication terminal according to the embodiment of the present invention. For example, a legacy addressing method and a group address frame addressed to the wireless communication terminal according to the embodiment of the present invention are transmitted separately, such as transmission using ch.2 using a multicast address frame addressed to the wireless communication terminal according to the embodiment. is there. In this case, it may be applied under the condition that, for example, the transmission is performed after a certain period of time elapses in ch. In addition, for example, the frequency channel that permits connection of the legacy terminal is limited to one (for example, ch.1 here), and the connection of the legacy terminal with another frequency channel (for example, ch.2 here) is rejected. You may make it prevent that a trouble occurs.

(effect)
By transmitting frames addressed to a plurality of radio communication terminals in all frequency channels that can be transmitted and received in this way, the transmission destination radio communication terminal that may move the frequency channel can reliably receive the frame. In addition, it is not necessary to accurately specify the connected frequency channel including the movement of the frequency channel of the transmission destination wireless communication terminal at the time of frame transmission at the wireless communication base station, and the processing load can be reduced.

  Also, when transmitting frames addressed to the same multiple wireless communication terminals using multiple frequency channels, the transmission timing between the multiple frequency channels may be shifted by putting the same value in the field indicating the order of the transmission numbers. For example, a wireless communication terminal that moves between frequency channels in the meantime, or a wireless communication terminal that can receive signals on multiple frequency channels, can identify duplicates even if the same packet is received on multiple frequency channels. Can do.

(Eighth embodiment)
The eighth embodiment will be described focusing on points added to the third to seventh embodiments. The point that this embodiment adds to the third to seventh embodiments is to notify / notify the usage rate in other frequency channels that can be simultaneously used by the radio communication base station.

  For example, as shown in FIG. 30, the case where the radio communication base station 101 broadcasts / reports information on each other's frequency channels using frequency channels ch.1 and ch.2 will be described. The radio communication base station 101 includes the frequency channel usage rate of ch.2 in the Beacon frame or Probe Response frame as information on the frequency channel of ch.1 and ch.2 and notifies and notifies. Conversely, the usage rate of the frequency channel at ch.1 may be included in the information on ch.1 at ch.2 and broadcast / notified.

  The channel usage rate is, for example, a time during which a frequency channel is occupied during a certain observation period. In the case of a mechanism for transmitting using CSMA, a wireless communication terminal (including a wireless communication base station) uses a contention method for transmitting when it is determined that the frequency channel is free. CSMA is a method of accessing after waiting for a fixed time and a random time in the wireless communication terminal in the state where the frequency channel is free in order to prevent collisions by accessing the frequency channel at the same time when the wireless communication terminals are free / CA (Carrier Sense Multiple Access with Carrier Avoidance). In the case of IEEE802.11 wireless LAN using CSMA / CA, whether the frequency channel is available is determined by the Clear Channel Assessment (CCA) mechanism that grasps the state of the wireless medium in the PHY layer and the virtual carrier sense status in the MAC layer To do. In the PHY layer, CCA = BUSY (busy) is detected when a certain level of received power on the frequency channel is detected, and CCA = IDLE (idle) is notified to the MAC layer when the received power is below a certain level (if using FIG. The notification signal is notified via a line from the PHY unit 4 to the MAC unit 2). The received power at a certain level is, for example, −82 dBm when the preamble portion at the head of the PHY packet can be detected, and −62 dBm when the preamble portion cannot be detected. In the MAC layer, the period when the CCA signal from this PHY layer is BUSY and the time described in the Duration / ID field of the frame not addressed to itself in the MAC layer (the media recognizes that this time is busy and stops transmission. It is said that NAV is spread, and in fact the PHY takes the union of the mechanism that recognizes media as busy even if CCA = IDLE) and recognizes that the frequency channel is occupied between this, It recognizes that the frequency channel is vacant during the exclusive period of this union. Therefore, since we are observing whether the frequency channel is occupied when trying to transmit on the frequency channel, statistical processing of this information can give the time occupied by the frequency channel in a certain observation period. it can. If the Beacon frame transmission interval (beacon interval) is fixed (beacon is actually not transmitted at a fixed interval when using CSMA / CA, etc.) The frequency channel occupancy time observed at Beacon Interval may be indicated, or the frequency channel occupancy time observed several times for Beacon Interval is divided by Beacon Interval (normalized by Beacon Interval) to indicate the average occupancy time You may do it.

  Alternatively, the channel usage rate is, for example, the amount of data transmitted by the wireless communication base station per certain time. After measuring for a certain period as described above, the average data amount per unit time such as Beacon Interval may be indicated.

  Alternatively, the channel usage rate is, for example, the time required from when an access request is generated when a wireless communication base station accesses a wireless medium for transmission at a certain time until an access right is actually acquired. After measuring for a certain period as described above, the average access time per unit time such as Beacon Interval may be indicated.

  In the above description, the frequency channel usage rate is basically described by the method of statistical processing when the radio communication base station itself performs channel access. However, the result of observation by the radio communication terminal connected to the radio communication base station You may notify a base station and use the said information. In this case, observation result information may be collected from a plurality of wireless communication terminals connected to the wireless communication base station, statistically processed, and used as a frequency channel usage rate.

  The wireless communication terminal 201 determines whether to shift to another frequency channel by acquiring information on the usage rate in the other frequency channel from the wireless communication base station 101. For example, if the channel occupancy rate at ch.2 is reduced compared to ch.1 that is currently used, it can be determined that it is preferable to shift to ch.2 and perform communication.

  The usage rate of ch.1 itself may be compared with the channel usage rate of ch.2 by taking statistics at the radio communication terminal 201 itself, but here the radio communication base station 101 If the channel usage rate in .1 and the channel usage rate in ch.2 are also included in ch.2, wireless communication terminal 201 can grasp the status of ch.1 and ch.2 It can be compared as information.

(effect)
In this way, the wireless communication base station notifies the usage rate of another frequency channel, so that it is possible to provide the wireless communication terminal with information for determining the transition to another frequency channel. By determining the shift to another frequency channel based on the information, it is possible to guarantee the communication on the shift destination frequency channel. By using this usage rate as the channel occupancy rate, the average amount of transmission data per unit time, or the average time until acquisition of the access right, it can be a more specific index when the wireless communication terminal makes a determination.

(Ninth embodiment)
The ninth embodiment will be described focusing on points added to the first to eighth embodiments. The point that this embodiment adds to the first to eighth embodiments is that the wireless communication base station includes the security information set with the wireless communication terminal in the connection management table for managing the connection information with the wireless communication terminal, Even when the wireless communication terminal moves in the frequency channel, it communicates with the security setting.

  There are several methods for encrypting communication in IEEE 802.11 wireless LAN. For example, as a method of encryption when exchanging data frames, WEP based on the ARC4 algorithm and TKIP (Temporal Key Integrity Protocol), which has increased security level by developing WEP, and AES (Advanced Encryption Standard, which has higher security strength) ) Based on CCMP (Counter mode with Cipher-block chaining Message authentication code Protocol). In addition, some WEPs use 64-bit data for the private key and others use 128-bit data for enhanced security. If the wireless communication base station and the wireless communication terminal can support a common encryption method, communication between the wireless communication base station and the wireless communication terminal can be encrypted using the encryption method.

  In the present embodiment, for example, when the wireless communication terminal 201 performs the connection setting for communication with the wireless communication base station 101 in ch. 1 with the configuration as shown in FIG. 6, data exchange using the wireless communication base station 101 and TKIP is performed. Perform the settings for the same operation. The wireless communication base station 101 holds FIG. 33 in which an item of security information is added instead of FIG. When the connection setting including the setting for TKIP with the wireless communication terminal 201 is normally completed (the wireless communication base station 101 permits connection with the wireless communication terminal 201 using TKIP), connection information related to the wireless communication terminal 201 is displayed. Write and hold as shown in FIG. If the wireless communication base station 101 draws with respect to the wireless communication terminal 201 in the connection management table, the supported frequency channels are ch.1 and ch.2, ch.1 can communicate with 802.11g, ch.2 In addition to being able to communicate with 802.11a, the frequency channel currently used is ch.1, and in addition, it can be seen that communication is performed with TKIP. In the example of FIG. 33, the wireless communication base station 101 and the wireless communication terminal 202 also indicate that the connection setting including the CCMP setting is normally completed and the communication using the CCMP is performed (described as AES instead of CCMP). You may).

  When the frequency communication channel change request from the wireless communication terminal 201 to ch.2 is transmitted to the wireless communication base station 101, and the wireless communication base station 101 permits the channel change request to ch.2, the ch. After switching the channel to 2, the wireless communication base station 101 and the wireless communication terminal 201 perform communication in ch.2 using TKIP, which is the encryption method set in ch.1. The TKIP information is retained only by changing the “used channel” item in FIG. 33 from ch.1 to ch.2. Here, FIG. 33 shows an example in which only the encryption method name is stored in the connection management table. However, even with the same encryption method, the encryption key is distinguished for each wireless communication terminal. If information with a resolution of 1 is necessary when using an encryption method, this information is also included.

(effect)
In this way, when the security information is managed together with the identifier of the wireless communication terminal in the wireless communication base station, and the change request to another frequency channel is permitted, the same security information is used in the change destination frequency channel. Communication can be started between the radio communication base station and the radio communication terminal without performing security setting again on the frequency channel.

(Tenth embodiment)
The tenth embodiment will be described focusing on differences from the ninth embodiment. This embodiment is different from the ninth embodiment in that, in the ninth embodiment, communication is performed using the same encryption method after changing the channel of the wireless communication terminal, whereas a channel change request is received from the wireless communication terminal. Sometimes, the radio communication base station confirms whether or not the change request destination frequency channel supports the encryption method, and if it does, the channel change is permitted, and if not, the channel change is rejected.

  For example, in the configuration shown in FIG. 6, the radio communication base station 101 supports TKIP and CCMP in ch.1, but only allows communication using CCMP as ch.2 allows only higher security strength communication. Such a security policy for each frequency channel may be stored in the MAC layer management unit 30 of FIG. 3 as a security policy management table, or the information itself is stored in an external memory. You may make it access, confirm, and refer to an external memory as needed. In this case, when the wireless communication terminal 201 transmits a channel change request to ch.2 to the wireless communication base station 101 in the state where the connection management table is as shown in FIG. 33, the current encryption method with the wireless communication terminal 201 is TKIP. Referring to FIG. 33, the radio communication base station 101 rejects the channel change request to ch. 2 of the radio communication terminal 201. When a rejection to the channel change request is transmitted as a frame to the wireless communication terminal 201, a reason may be included such that the security request is not satisfied. Normally, the channel change response frame is a management frame, and in the management frame of the response system to the request, when notifying the rejection, in addition to the rejection in the field called Status Code, the reason for the rejection is also notified. You can use it.

  As described above, if there is a different security policy depending on the frequency channel, the security policy in another frequency channel may be included as information on the frequency channel and notified by Beacon and notified by Probe Response. For example, in the above example, “beacon” and “probe response” of ch.1 include information corresponding to the encryption scheme CCMP or requesting the encryption scheme CCMP as information in ch.2. For example, FIG. 34 is used instead of FIG. On the contrary, it is possible to include information corresponding to the encryption methods TKIP and CCMP as information in ch.1 in the Beacon and Probe Response of ch.2. For example, instead of FIG. 15, the wireless communication terminal 201 provides items of encryption schemes corresponding to the respective channels as shown in FIG. 35, and holds operation information of the wireless communication base station 101 at ch.1 and ch.2. If an encryption method that cannot be recognized by the wireless communication terminal 201 is notified, it may be added. In addition, the notification of the security method in other frequency channels (for example, the correspondence table that refers to which encryption method is mutually used) is simply the security level if the wireless communication base station and the wireless communication terminal have the same recognition. A display method such as

(effect)
In this way, the radio communication base station grasps the security method that can be used by the radio communication terminal before requesting to change to another frequency channel, and determines whether or not to permit when a request to change to another frequency channel is received. It is known that the use of the wireless communication terminal can maintain the security in another frequency channel, and it is rejected in another frequency channel when the security method required by the wireless communication base station is not satisfied. The connection request from the wireless communication terminal can be grasped in advance by the wireless communication terminal, and the occupation of the frequency channel due to the exchange of frames for useless connection can be reduced. Further, when the change of the radio communication terminal to another frequency channel is permitted, the information on the security method notified from the radio communication terminal can be used for communication with the radio communication terminal on the changed frequency channel.

  In addition, by notifying the security level required by the radio communication base station in another frequency channel, the security level required in another frequency channel can be changed, and another frequency channel can be set in the radio communication terminal. It can be judged whether it is a corresponding security method.

(Eleventh embodiment)
The eleventh embodiment will be described focusing on differences from the tenth embodiment. This embodiment differs from the tenth embodiment in that, in the tenth embodiment, when the encryption method used before the channel change is not the encryption method requested in the change request destination channel, wireless communication is performed. Although the communication base station rejected the channel change request of the wireless communication terminal, in this embodiment, if the encryption method used before the channel change is not the encryption method requested by the change request destination channel, the wireless communication terminal If the wireless communication base station can select one of the encryption methods that can be used for the change request destination channel, the change request is permitted and data exchange is performed on the change destination channel. Before starting the communication, the setting of the selected encryption method is performed with the wireless communication terminal.

  For this purpose, it is necessary for the wireless communication terminal to notify the wireless communication base station of a plurality of encryption schemes corresponding in advance.

  When the configuration as shown in FIG. 6 is adopted, when the wireless communication terminal 201 transmits a connection request to the wireless communication base station 101 using ch. include. In this way, the connection management table for the wireless communication terminal in the wireless communication base station 101 is as shown in FIG. Similarly, FIG. 36 shows a state in which the wireless communication terminal 202 is notified that the corresponding encryption method is CCMP.

  The wireless communication terminal 201 corresponds to the wireless communication base station 101 and ch.2 when setting up communication connection using TKIP in ch.1, and what communication method is supported in ch.2. In addition, it may be notified in addition to what other encryption methods are supported, but it is encrypted only if it supports TKIP when initially setting up the communication connection in ch.1. The wireless communication base station 101 is notified of the encryption method, and CCMP is required for communication using the Beacon frame and Probe Response frame from the wireless communication base station 101 for ch. Understandably, when it is determined that it is better to notify other corresponding encryption methods such as the possibility of transition to ch.2 at the wireless communication terminal 201, CCMP as the encryption method corresponding to the wireless communication base station 101 is determined. May be additionally notified.

  The radio communication base station 101 receives the channel change request frame for ch.2 from the radio communication terminal 201 and only performs setting for communication by TKIP with the radio communication terminal 201, but wirelessly from FIG. If the communication terminal 201 knows that it can also support CCMP required for ch.2 communication, it permits a channel change request and performs CCMP communication before starting data frame exchange on ch.2. Setting for starting is performed with the wireless communication terminal 201. In the CCMP communication start setting, a CCMP setting request may be included in the channel change response frame and transmitted to the wireless communication terminal. In this case, the wireless communication terminal 201 that has received the channel change response frame transmits a frame necessary for CCMP setting with the wireless communication base station 101 using ch. Alternatively, the wireless communication terminal 201 transmits a frame necessary for CCMP setting in ch.2 after completing the movement to ch.2. The wireless communication base station 101 may transmit a CCMP setting request to the wireless communication terminal 201 after the wireless communication terminal 201 moves to ch. In this case, the wireless communication terminal 201 transmits a frame necessary for CCMP setting to the wireless communication base station 101 using ch.2.

  In the above, the wireless communication base station 101 received a channel change request frame from the wireless communication terminal 201 and then sent a CCMP setting request to the wireless communication terminal 201. Then, since the use of CCMP is requested in ch.2, a CCMP setting request may be transmitted to the wireless communication terminal 201 in advance before the channel change request frame from the wireless communication terminal 201 is transmitted.

  In the above description, the wireless communication base station 101 issues a CCMP setting request to the wireless communication terminal 201, and the wireless communication terminal 201 transmits a frame necessary for CCMP setting to the wireless communication base station 101 in response to the request. However, for example, the Beacon frame and Probe Response frame from the wireless communication base station 101 show that CCMP is necessary for communication in ch.2, and there is a possibility that the wireless communication terminal 201 may shift to ch.2. When it is determined that it is better to notify other compatible encryption methods, the frame necessary for CCMP setting is transmitted to the wireless communication base station 101 and the CCMP setting is started from the wireless communication terminal 201. May be.

(effect)
In this way, if the security method before the frequency channel change can be used in the frequency channel after the change, by performing communication using the same security information, it is possible to set again for using the security method after the frequency channel change. If the exchange of frames can be omitted and the security method before the frequency channel change cannot be used in the frequency channel after the change, but the security method required by the wireless communication base station is a security method supported by the wireless communication terminal By performing any one of the settings with the radio communication terminal on the changed frequency channel, the security required by the radio communication base station on the changed frequency channel can be maintained.

(Twelfth embodiment)
The twelfth embodiment will be described focusing on points added to the first to eleventh embodiments. This embodiment adds to the first to eleventh embodiments by notifying the radio communication base station of communication methods that can be used in other frequency channels after the radio communication terminal is connected to the radio communication base station. is there.

  When the configuration as shown in FIG. 6 is adopted, the wireless communication terminal 201 completes exchange of the Association frame with the wireless communication base station 101 in order to perform settings necessary for connection with ch.1, and can communicate with ch.1. It has become. On this basis, in the present embodiment, a management frame of a new Subtype (here, Subtype 5) different from the Association frame is provided to notify the communication method corresponding to other frequency channels, and wireless communication is performed using the management frame. The base station 101 is notified of the communication method corresponding to the wireless communication terminal 201 in ch.2. Note that, as in the above-described embodiment, the communication method corresponding to ch.2 is already notified in the Association Request frame, and then for another frequency channel, for example, the radio communication terminal 201 also supports ch.3. If so, the communication method of ch.3 may be notified by the management frame of Subtype 5. The management frame of Subtype 5 is a unicast frame addressed to the radio communication base station 101. When the radio communication base station 101 receives the management frame of Subtype 5, it responds with an ACK frame as in the case of receiving a normal unicast frame. Then, the radio communication base station 101 writes and holds the notified communication method corresponding to ch.2 in the item related to the radio communication terminal 201 in the connection management table.

  The wireless communication terminal 201 notifies the wireless communication base station 101 of the communication method corresponding to ch.2 before transmitting the change request to ch.2 to the wireless communication base station 101.

(effect)
In this way, a wireless communication terminal can additionally notify a communication method that can be used on another frequency channel after connecting on a certain frequency channel, thereby enabling a communication method that can be used on another frequency channel in the wireless communication terminal. As a result, it is possible to provide a grace period for preparing a notification frame, to reduce a load at the time of connection setting, and to obtain the same effect as described above, such as being able to continue communication without resetting after channel change.

(13th Embodiment)
The thirteenth embodiment will be described focusing on points added to the first to eleventh embodiments. The point that this embodiment adds to the first to eleventh embodiments is that the wireless communication terminal notifies the wireless communication base station of the corresponding change regarding the information of the communication method that can be used in other frequency channels notified at the time of the connection request. It is to be.

  In the case of adopting the configuration shown in FIG. 6, it is assumed that the radio communication base station holds a connection management table as shown in FIG. Here, it is assumed that the wireless communication terminal 202 is also performing connection setting in ch.1, and the wireless communication terminal 202 will be used for the description. The wireless communication terminal 202 notifies the wireless communication base station 101 of the communication method supported by ch.2 when connected by ch.1, but if the communication method supported by ch.2 is changed, the details of the change To the radio communication base station 101 using a management frame of a new Subtype (here, Subtype 6). For example, when the wireless communication terminal 202 is initially notified, power is supplied, and the modulation and coding scheme that can be transmitted / received in ch.2 as the item corresponding to the wireless communication terminal 202 in FIG. It is assumed that the wireless communication base station 101 is notified that 0 to 32 and the receivable modulation and coding scheme is MCS = 33 and 34 as 802.11n. After that, if the wireless communication terminal 201 is no longer compatible with MCS = 33, 34, which has been issued as a modulation method that can be received as a low power consumption measure, in response to the loss of power supply, The wireless communication base station 101 is notified. The radio communication base station 101 receives the contents of this Subtype 6 and updates information on an appropriate part related to the radio communication terminal 202 in the connection management table. The connection management table in the radio communication base station 101 is updated as shown in FIG. The change notification method from the wireless communication terminal 202 may be, for example, the change part may be notified that there is no modulation and coding scheme that can be received because only the 802.11n part has been changed. It is also possible to notify all of the corresponding communication schemes (such as MCS = 0 to 32 for a modulation and coding scheme that can be transmitted and received, and MCS = void for a modulation and coding scheme that can be received). In addition, if there is a change in multiple frequency channels in common, the frequency channel (ch.1 and ch.2 here) and the communication method that are affected by the change may be notified, or the frequency channel may be omitted. You may make it notify the change of a communication system. In the latter example, the wireless communication terminal 202 notifies the content related to MCS, so that the wireless communication base station 101 is compatible with 802.11n, and therefore the content held in ch.2 only needs to be updated. This is to understand.

  Before transmitting the change request to ch.2 to the radio communication base station 101, the radio communication terminal 202 notifies the radio communication base station 101 of any change in the communication method corresponding to ch.2.

(effect)
In this way, when the communication method that can be used in the wireless communication terminal is changed, the information is re-notified to the wireless communication base station, so that wireless communication is performed with an appropriate communication method corresponding to the communication state in the wireless communication terminal. The terminal and the wireless communication base station can communicate.

(Fourteenth embodiment)
The fourteenth embodiment will be described focusing on points added to the first to thirteenth embodiments. The point that this embodiment adds to the first to thirteenth embodiments is the operation when a wireless communication terminal connects to a wireless communication base station that cannot share and manage information related to wireless communication terminals connected on a plurality of frequency channels. It is.

  When the configuration as shown in FIG. 39 is adopted, the radio communication terminal 201 can communicate with the frequency channel ch.1 or ch.2. The radio communication base station 102 may be able to communicate with ch.2 at the same time, or may be limited to a single frequency channel (here, ch.1). In a frame (Beacon frame, Probe Response frame, etc.) transmitted on ch.1), only information relating to the frequency channel (for example, ch.1 here) is entered. And even if the wireless communication base station 102 transmits information necessary for the wireless communication terminal 201 to communicate on another frequency channel (ch. It is not used when communicating with the wireless communication terminal 201 in 2). On the other hand, the radio communication base station 103 is the same as the radio communication base station 102, but ch.1 in the radio communication base station 102 is set to ch.2.

  In such a situation, the wireless communication terminal 201 is connected to and communicates with the wireless communication base station 102 through ch.1, but a request to change the channel to ch.2 is generated. The channel change request is issued from the result of information collected by the SME through the PHY layer and the MAC layer in consideration of the wireless communication status, the request condition of the transmission traffic of the wireless communication terminal 201, and the like, and is notified to the MAC layer management unit 30.

  In this case, the wireless communication terminal 201 understands that even if the wireless communication base station 102 issues a request to change to ch.2, the communication information used in ch.2 of the wireless communication terminal 201 cannot be retained and used. ing. For example, when the radio communication base station is linked to a function for reporting / notifying frequency channel information different from the information holding capability between the frequency channels of the radio communication terminals, the radio communication base station 102 uses the Beacon frame in ch.1. This can be understood from the fact that the / Probe Response frame does not contain ch.2 information. Or, if the wireless communication base station has the ability to hold information between the frequency channels of the wireless communication terminals, if the Beacon frame / Probe Response frame notifies the information as the Capability of the wireless communication base station, grasp it be able to.

  The radio communication terminal 201 switches the frequency channel operating in ch.2 and searches for a radio communication base station operating by SCAN there. Here, the wireless communication terminal 201 may transmit a frame for notifying the wireless communication base station 102 of disconnection (a management frame called a disassociation frame in the IEEE802.11 wireless LAN). By transmitting the frame to the wireless communication base station 102, the wireless communication base station 101 can delete the information held for the wireless communication terminal 201 from the connection management table and reduce the amount of information held. When it detects that the wireless communication base station 103 is operating in ch.2, the wireless communication terminal 201 issues a connection request to the wireless communication base station 103. Communication with the communication base station 103 is started. When a plurality of wireless communication base stations are detected in ch.2, the information is collected by the MAC layer management unit 30, and the wireless communication base station to which the wireless terminal entity transmits a connection request in response to the aggregate information The connection setting operation is started through the MAC layer management unit 30. For example, if the wireless communication base station 102 was operating even in ch.2 (although it did not share terminal management with ch.1), the wireless communication terminal 201 and the wireless communication base station 102 If the station 103 is detected, the destination of the transmission of the connection request in consideration of the frame reception status (for example, received power and interference amount) from each radio communication base station and the communication capability (Capability) of each radio communication base station. Select a wireless communication base station. In transmitting the connection request, the wireless communication base station is notified of the capability of the wireless communication terminal 201 necessary for performing communication in ch.2. According to the previous embodiment, the notification capability includes a corresponding communication standard, a modulation encoding scheme, an encryption scheme, and the like. When the wireless communication terminal 201 sends a connection request to the wireless communication base station 103 without notifying the wireless communication base station 102 of disconnection (when the IEEE802.11 wireless LAN does not transmit a disassociation frame), it reconnects. A connection request may be transmitted in the form of a request. In the IEEE 802.11 wireless LAN, a management frame called Reassociation Request is used. The Reassociation Request frame transmits basically the same information as the Association Request frame, but additionally notifies the previously connected radio communication base station (in this case, the radio communication base station 102). Therefore, if it is described that the wireless communication base station 103 receives the Reassociation Request frame from the wireless communication terminal 201 and the wireless communication base station previously connected in the frame is the wireless communication base station 102 The communication base station 103 notifies the wireless communication base station 102 that the wireless communication terminal 201 is connected to the wireless communication base station 103, and the data addressed to the wireless communication terminal 201 transmitted to the wireless communication base station 102 is transmitted to the wireless communication base station 102. For example, the wireless communication base stations can cooperate with each other, such as having the data transferred to 103. Similar to the association process, the reassociation process transmits a response management frame (reassociation response frame for the reassociation request frame) from the radio communication base station.

  If radio communication terminal 201 can detect a radio communication base station that operates also in ch.1 in ch.1, naturally, in view of the fact that a channel change request to ch.2 is generated, the radio communication base station in ch.1 It is desirable to connect to.

(effect)
In this way, it is possible to connect to a radio communication base station that can simultaneously communicate on two or more frequency channels, and to connect to a radio communication base station that can communicate on a single frequency channel, thereby expanding the choice of communication destinations. If a request for transition to the second frequency channel occurs even if it is connected to a radio communication base station that can communicate with a single frequency channel, a radio communication base station that can be connected to the second frequency channel When searching and detecting, it is possible to notify a communication method that can be used in the second frequency channel, issue a connection request, and connect to a radio communication base station that operates in the second frequency channel.

(Fifteenth embodiment)
The fifteenth embodiment will be described focusing on the points added to the first to thirteenth embodiments. The point that this embodiment adds to the first to thirteenth embodiments is the operation of the wireless communication terminal when the wireless communication terminal transmits a channel change request to the wireless communication base station and is rejected.

  In the case of adopting the configuration as shown in FIG. 6, the wireless communication terminal 201 transmits a channel change request to ch.2 from the situation where the wireless communication terminal 201 is connected to and communicates with the wireless communication base station 101 via ch.1. The wireless communication base station 101 receives the channel change request and does not support the modulation and coding method requested by ch.2, does not support the encryption method requested by ch.2, and wireless by ch.2. It is assumed that the channel change request is rejected because the communication terminal 201 cannot support communication on ch.2 (for example, because it is already connected to a large number of wireless communication terminals). When the wireless communication terminal 201 receives a notification of rejection as a channel change response from the wireless communication base station 101, the wireless communication terminal 201 switches to ch.2 and scans for another operating wireless communication base station. The wireless communication terminal 201 may transmit a frame (disassociation frame in the case of IEEE802.11 wireless LAN) that notifies the wireless communication base station 101 of disconnection as in the above-described embodiment. If only wireless communication base station 101 can be detected in ch.2, a connection request may be issued to wireless communication base station 101 again, but it can be expected to be rejected, so other wireless communication base stations are detected and selected. It is desirable. When a wireless communication base station other than the wireless communication base station 101 is detected (after determining that the wireless communication base station corresponds to the communication method requested by the wireless communication terminal 201 in ch.2), the wireless communication A connection request is issued to the base station. The wireless communication terminal 201 transmits a connection request to the newly connected wireless communication base station without notifying the wireless communication base station 101 of the disconnection (in the situation where the IEEE 802.11 wireless LAN does not transmit a disassociation frame). In this case, the connection request may be transmitted in the form of a reconnection request (Reassociation Request frame in IEEE802.11 wireless LAN) as in the above embodiment.

  Only the wireless communication base station 101 can be detected as the appropriate wireless communication base station for communication with ch.2, or the connection request was re-sent to the wireless communication base station 101 with ch.2 but was rejected. If communication with .2 is not possible, review the channel change request and return to communication with ch.1 or try connection with a frequency channel other than ch.2. For example, if the wireless communication terminal 201 knows that the wireless communication base station 101 is operating in ch.3 in addition to ch.1 and ch.2, it sends a channel change request to ch.3. .

(effect)
In this way, it is possible to connect to a radio communication base station that can simultaneously communicate with two or more frequency channels, and to connect with the second frequency channel when the radio communication base station is not permitted to make a transition request to the second channel. When other wireless communication base stations are searched and detected, a communication method usable in the second frequency channel is notified, a connection request is issued, and connection is made to another wireless communication base station operating on the second frequency channel. can do. Moreover, by doing in this way, the choice of the radio | wireless communication base station which can communicate can be expanded.

(Sixteenth embodiment)
The sixteenth embodiment will be described focusing on points added to the first to thirteenth embodiments. The point that this embodiment adds to the first to thirteenth embodiments is the operation of the radio communication terminal when a change request to a frequency channel that is not supported by the radio communication base station is a radio communication terminal.

  When the configuration as shown in FIG. 6 is adopted, the frequency channels with which the radio communication base station 101 can communicate simultaneously are ch.1 and ch.2, whereas the radio communication terminal 201 can handle the frequency channels with ch.1. , Ch.2 and ch.3. Of course, not only when the wireless communication terminal 201 supports all the frequency channels corresponding to the wireless communication base station 101 but also supports higher frequency channels, the frequency channel supported by the wireless communication base station 101 is ch.1. And ch.2 include an example in which the frequency channels supported by the wireless communication terminal 201 are partially overlapped as in ch.1 and ch.3, and some are corresponding to different frequency channels.

  According to the previous embodiment, the channel of the wireless communication terminal 201 is changed from ch.1 to ch.2 corresponding to both the wireless communication base station 101 and the wireless communication terminal 201. However, here, a situation is considered in which the radio communication terminal 201 changes to ch.3 that is not notified or notified as a frequency channel with which the radio communication base station 101 can simultaneously communicate. The decision to change to ch.3 is made by SME, etc. based on the wireless communication status and traffic request as described above. Since the wireless communication terminal 201 does not include ch.3 as a frequency channel with which the wireless communication base station 101 can simultaneously communicate, the wireless communication base station 101 can connect to the wireless communication terminal 201 even if the channel is changed to ch.3. It can be seen that there is no guarantee that communication can be started without retaining the information and resetting in ch. Therefore, the wireless communication terminal 201 switches to ch.3, and scans for other wireless communication base stations operating there. Before that, the wireless communication terminal 201 transmits a frame (disassociation frame in IEEE802.11 wireless LAN) that notifies disconnection as in the above embodiment, assuming that the wireless communication terminal 201 does not reconnect to the wireless communication base station 101 using ch3. You may do it. When a wireless communication base station is detected (when it is determined that the wireless communication base station supports the communication method requested by ch. 3 of the wireless communication terminal 201), a connection request is transmitted to the wireless communication base station . When the wireless communication terminal 201 transmits a connection request to the new wireless communication base station without notifying the wireless communication base station 101 of disconnection (when the IEEE802.11 wireless LAN does not transmit a disassociation frame) Similar to the embodiment, the connection request may be transmitted in the form of a reconnection request (Reassociation Request frame in IEEE802.11 wireless LAN). If ch.3 is detected by wireless communication base station 101 (even if it is not broadcast / notified simultaneously as ch.1 and ch.2 as corresponding frequency channels) and ch.3 is used by radio communication terminal 201 If the communication method corresponding to the request is performed, the connection request is transmitted to the radio communication base station 101 again. In this case, if a disassociation frame has already been transmitted, an association frame is transmitted. If a disassociation frame has not been transmitted, an association frame is transmitted or a reassociation frame is transmitted.

  Communication in ch.3 cannot be performed because a wireless communication base station suitable for communication in ch.3 cannot be detected, or a connection request was issued to the wireless communication base station in ch.3 but was refused. In this case, review the channel change request and return to communication with ch.1 or try connection with a frequency channel other than ch.3. For example, if the wireless communication terminal 201 is also compatible with ch.4, it is possible to scan for an appropriate wireless communication base station using ch.4.

(effect)
In this way, when a request is made to shift to another third frequency channel that is not supported by the same wireless communication station, the third communication channel is connected to the third wireless communication station that can simultaneously communicate with two or more frequency channels. A wireless communication base station that operates on the third frequency channel when a wireless communication base station that can be connected on the other frequency channel is searched and detected, a communication method that can be used on the third frequency channel is notified, and a connection request is issued. Can be connected to. Moreover, by doing in this way, the choice of the radio | wireless communication base station which can communicate can be expanded.

(Seventeenth embodiment)
The seventeenth embodiment will be described focusing on differences from the first to thirteenth embodiments. The present embodiment is different from the first to thirteenth embodiments in that the wireless communication terminal notifies the wireless communication base station even if the wireless communication base station does not notify or notify the information about the communication method in other frequency channels. It is to notify together with information on other frequency channels at the time of a connection request.

  In the case of adopting the configuration as shown in FIG. 6, in this embodiment, the wireless communication base station 101 does not include the communication method used in ch.2 in the Beacon frame transmitted in ch.1 and the wireless communication terminal 201 in ch.1. Does not include the communication method used in ch.2 in the Probe Response frame to which the wireless communication base station 101 responds when the probe request frame is transmitted to the wireless communication base station 101 (either a group address frame or a unicast frame). .

  Here, an identifier for notifying that the wireless communication base station 101 can transmit / receive in other frequency channels and that the connection information of the wireless communication terminal can be shared and managed for connections in other frequency channels is also used. You may make it put in a Response frame. For example, the MC ID of the sixth embodiment can be used for such a purpose.

  On the other hand, when the wireless communication terminal 201 issues a connection request to the wireless communication base station 101 using ch.1, it also notifies the communication method supported by the wireless communication terminal 201 using ch.2. Here, the wireless communication terminal 201 is not a legacy wireless communication base station but a wireless communication base station according to the embodiment of the present invention by the wireless communication base station 101 putting the above-mentioned MC ID in the Beacon frame or Probe Response frame. It may be determined that there is, and then the communication method corresponding to ch.2 may be notified together.

  When the wireless communication base station 101 detects that the wireless communication terminal 201 contains information on the communication method supported by the wireless communication terminal 201 in ch.2, for example, in the Association Request frame from the wireless communication terminal 201, the connection management table Information on the wireless communication terminal 201 is registered. Then, the connection success is notified in the Association Response frame. Notification of successful connection is placed in the Status code. As a status code, instead of simply using a code indicating that the association was successful, a code indicating that the association request was accepted, including support for other frequency channels, may be used as another code. . Further, the wireless communication base station 101 may put a communication method supported by the wireless communication base station 101 in ch.2 in the Association Response frame. In this way, the wireless communication terminal 201 also sends a notification of correspondence in ch.2 at the wireless communication base station 101 because the status response in the Association Response frame and further information on ch.2 is included in the example described later. You can confirm that it was accepted.

(effect)
As described above, even if the radio communication base station does not report / notify information on other frequency channels, the radio communication terminal corresponding to a plurality of frequency channels is set to the radio communication base station capable of transmitting / receiving simultaneously on the plurality of frequency channels. In response to information on the correspondence in other frequency channels, the wireless communication base station receives the information and shares and manages the information over a plurality of frequency channels, and the connection is established even when the wireless communication terminal shifts to another frequency channel. Can be maintained.

(Eighteenth embodiment)
The eighteenth embodiment will be described focusing on points added to the sixteenth and seventeenth embodiments. This embodiment is added to the sixteenth and seventeenth embodiments in that when the wireless communication terminal changes the channel and connects to the wireless communication base station again, information regarding the wireless communication terminal remains in the connection management table. It is to use it.

  When the configuration as shown in FIG. 6 is adopted, the radio communication terminal 201 shifts the channel from ch.1 to ch.2 directly without issuing a channel change request from ch.1 to ch.2 to the radio communication base station 101. If there is information related to ch.2 of the wireless communication terminal 201 in the connection management table of the wireless communication base station 101, the wireless communication terminal 201 moves to ch.2 At the stage of trying to connect to the station 101, the wireless communication terminal 201 is notified that it has the information. For example, the wireless communication terminal 201 scans again with ch.2 and wirelessly transmits its own timer from the timer information in the Beacon frame or Probe Response frame transmitted by the wireless communication base station 101 (using a field called Timestamp in IEEE802.11 wireless LAN). In accordance with the timer of the communication base station 101 (the operation is JOIN in the IEEE802.11 wireless LAN), it is assumed that the wireless communication base station 101 is reconnected to the wireless communication base station 101 via ch.2 through the Authentication process and the Association process. When the probe request frame is received in this SCAN process or in the authentication process, the wireless communication base station 101 knows that the wireless communication terminal 201 is trying to connect to the wireless communication base station 101, and the wireless communication terminal 201 101 notifies that the wireless communication terminal 201 holds information related to the communication method supported by ch.2. For example, the probe response frame may notify that the information is held, or a management frame called Subtype 7 may be used. As a result, the wireless communication terminal 201 grasps that the wireless communication base station 101 already has information regarding the communication method supported by ch.2 of the own terminal. Then, it can be a simple Association process that omits the communication method supported by ch.2. This simple process may be performed by providing another management frame, for example, Subtype 8 and a management frame called Subtype 9 of a response frame to the management frame, instead of the Association Request frame and the Association Response frame. For example, as in the ninth embodiment, what has already been set in ch. 1 regarding the setting of the encryption method may be omitted in ch.

(effect)
In this way, if the wireless communication base station holds the correspondence information over the plurality of frequency channels of the wireless communication terminal, the wireless communication terminal in advance between the plurality of frequency channels corresponding to the wireless communication base station to the wireless communication base station. Even if you do not notify the transition, you can communicate with the wireless communication terminal using the information already stored when the wireless communication terminal is connected on another compatible frequency channel. It is possible to simplify the connection setting in the frequency channel.

(Nineteenth embodiment)
The nineteenth embodiment will be described focusing on differences from the first to thirteenth embodiments. This embodiment is different from the first to thirteenth embodiments in that notification is made by the PHY method when a communication method corresponding to the wireless communication base station and the wireless communication terminal is notified / notified.

  In the case of adopting the configuration as shown in FIG. 6, it is assumed that the wireless communication base station 101 and the wireless communication terminals 201 and 202 operate based on, for example, IEEE 802.11 wireless LAN. For example, IEEE802.11a is OFDM (Orthogonal Frequency Division Multiplexing), IEEE802.11b is DSSS (Direct Sequence Spread Spectrum) and CCK (Complementary Code Keying), IEEE802.11g is OFDM (IEEE802.11 .11g is called ERP-OFDM, which means Extended Rate PHY conforming to Clause 19, that is, the abbreviation for PHY layer extended rate according to Chapter 19 of the IEEE 802.11 standard) and optional ERP-PBCC (Packet Binary) Convolutional Code) mode and DSSS-OFDM mode. In the present embodiment, notification and notification are made using such a method name. For example, notification and notification are made such as OFDM instead of IEEE802.11a and DSSS instead of IEEE802.11b. Based on IEEE802.11 wireless LAN may be a premise when using this embodiment, and it is necessary for wireless communication terminals (including wireless communication base stations) to be IEEE802.11 wireless LAN. May be notified in the IEEE 802.11 MAC frame format, or may be implicitly notified because the frame is in the IEEE 802.11 MAC frame using an essential or common PHY rate.

  The wireless communication base station or wireless communication terminal that has received such notification / notification in the PHY method can grasp which communication standard is based on the frequency channel included in the notification / notification content. For example, in the Beacon frame transmitted by the wireless communication base station 101 in the 5 GHz band, the other corresponding frequency channel is the 2.4 GHz band, and if the corresponding PHY method is notified as OFDM, OFDM is used in the 2.4 GHz band. This means that the wireless communication terminal 201 in the 5 GHz band can recognize that it is compatible with IEEE802.11g ERP-OFDM. Similarly, when the wireless communication terminal 201 notifies correspondence information regarding other frequency channels using an association request frame or the like, the wireless communication base station 101 can recognize the corresponding information.

(effect)
By notifying and notifying using the PHY method in this way, it is possible to give the same information as notifying the communication standard method from the information of the frequency channel corresponding to the PHY method that can be used over a plurality of frequency channels. .

[Appendix]
(1) The radio communication base station according to the embodiment is configured so that, in the radio communication base station capable of simultaneously communicating with two or more frequency channels, the second frequency channel in a state where radio packets can be received in addition to the first frequency channel. The wireless communication terminal notified from the wireless communication terminal when the identifier and the communication method used in the second frequency channel are notified by the first frequency channel and connection of the wireless communication terminal is permitted by the first frequency channel Is stored in the connection management table together with the identifier of the wireless communication terminal and the identifier of the frequency channel, and when the change request to the second frequency channel from the wireless communication terminal is permitted, the second frequency channel Among the communication methods used in the above, the communication method usable by the wireless communication terminal on the connection management table is determined from the identifier of the wireless communication terminal. Of a wireless communication base station and performs communication with the radio communication terminal on the frequency channel.

<Effect of (1)>
The communication method used by the wireless communication base station in the second frequency channel to the wireless communication terminal transmitting and receiving in the first frequency channel by notifying the communication method used in the second frequency channel in the first frequency channel By holding the communication method that can be used by the wireless communication terminal that is permitted to connect together with the identifier and the identifier of the frequency channel, the wireless communication base station Allows wireless communication terminals to move between supported frequency channels.

  (1-1) The radio communication base station according to the embodiment is configured such that the radio communication base station capable of simultaneous communication using two or more frequency channels has a second frequency in which radio packets can be received in addition to the first frequency channel. The channel identifier and the communication method used in the second frequency channel are notified by the first frequency channel, and the wireless communication terminal notified by the wireless communication terminal when connection of the wireless communication terminal is permitted by the first frequency channel The communication method usable in the first frequency channel of the communication terminal is held in the connection management table together with the identifier of the wireless communication terminal and the identifier of the frequency channel, and the communication method usable in the second frequency channel from the wireless communication terminal is stored. When the notification is received, the identifier of the second frequency channel and the communication usable in the second frequency channel of the wireless communication terminal are entered in the connection management table. When information on the scheme is added in association with the identifier of the radio communication terminal and a change request to the second frequency channel is permitted from the radio communication terminal, the radio among the communication schemes used in the second frequency channel A wireless communication base station that communicates with the wireless communication terminal on a second frequency channel using a communication method that can be used by the wireless communication terminal on a connection management table from an identifier of the communication terminal.

<Effect of (1-1)>
The communication system usable in the second frequency channel is additionally notified after the connection in the first frequency channel, so that it is possible to prepare a notification frame regarding the communication system usable in the second frequency channel in the wireless communication terminal. Thus, it is possible to reduce the load at the time of connection setting and to obtain the same effect as described above, such as being able to continue communication without resetting after changing the channel.

  (1-2) The radio communication base station according to the embodiment is the radio communication base station described in (1) or (1-1) above, and the communication scheme that can be used by the radio communication terminal permitted to connect is re-established. The wireless communication base station is characterized in that when a notification or a re-notification of a usable frequency channel and a usable communication method is received, information of a corresponding connection management table is updated.

<Effect of (1-2)>
By receiving the re-notification of the usable communication method from the wireless communication terminal and updating the information in the connection management table, communication can be performed with an appropriate communication method corresponding to the communication state at the wireless communication terminal.

  (1-3-1) The wireless communication base station according to the embodiment is the wireless communication base station described in (1), (1-1), (1-2) above, and the communication method is a communication standard. A wireless communication base station characterized by being represented by type.

<Effect of (1-3-1)>
By notifying the type of communication standard to be used in the second frequency channel in the first frequency channel, the wireless terminal performing transmission / reception in the first frequency channel enables communication used by the wireless communication base station in the second frequency channel. The type of standard can be grasped, and the type of communication standard that can be used by the wireless communication terminal that is permitted to connect is held together with the identifier and the identifier of the frequency channel, so that the connection with the wireless communication terminal is not temporarily disconnected. A wireless communication terminal can be moved between frequency channels supported by the wireless communication base station.

  (1-3-2) The wireless communication base station according to the embodiment is the wireless communication base station described in (1-3-1) above, and distinguishes an extension method within the same communication standard according to the type of communication standard. This is a radio communication base station.

<Effect of (1-3-2)>
The wireless communication base station transmits the second frequency using the first frequency channel by notifying the type of the extension method within the same communication standard used in the second frequency channel in the first frequency channel. The type of extension method within the same communication standard used in the channel can be grasped, and the type of extension method within the same communication standard that can be used by the wireless communication terminal permitted to connect is held together with the identifier and the identifier of the frequency channel. Thus, the wireless communication terminal can be moved between frequency channels supported by the wireless communication base station without once disconnecting from the wireless communication terminal.

  (2) The radio communication base station according to the embodiment is capable of receiving radio packets in addition to the first frequency channel in a radio communication base station that can simultaneously communicate with two or more frequency channels using a plurality of modulation and coding schemes. The second frequency channel identifier and the modulation and coding scheme used in the second frequency channel are notified by the first frequency channel, and the connection request from the wireless communication terminal is received and permitted by the first frequency channel. In this case, the modulation and coding scheme usable by the wireless communication terminal notified from the wireless communication terminal is held in a connection management table together with the identifier of the wireless communication terminal and the identifier of the frequency channel. Upon receiving a change request to the frequency channel, a modulation and coding scheme that can be used by the wireless communication terminal on the connection management table from the identifier of the wireless communication terminal When it is determined that the second frequency channel can be used, and it is determined that the second frequency channel can be used and permitted, the identifier of the frequency channel is updated to the identifier of the second frequency channel and held, and used in the second frequency channel. Communicating with the wireless communication terminal on the second frequency channel using the modulation and coding method usable by the wireless communication terminal on the connection management table from the identifier of the wireless communication terminal among the modulation and coding methods A wireless communication base station.

<Effect of (2)>
A wireless terminal that performs transmission / reception on the first frequency channel by communicating the modulation / encoding communication method of the second frequency channel on the first frequency channel of two frequency channels that use a plurality of modulation and coding methods, By grasping the modulation and coding scheme used by the base station in the second frequency channel and holding the usable modulation and coding scheme of the wireless communication terminal permitted to connect together with the identifier and the identifier of the frequency channel, When receiving a change request to the second frequency channel from the wireless communication terminal, it is possible to determine whether or not the modulation and coding scheme usable by the wireless communication terminal can be used in the second frequency channel. As a result of judging and permitting, communication on the second frequency channel with the wireless communication terminal can be surely ensured, and then connection with the wireless communication terminal is performed. Once the wireless communication terminal among the frequency channels that support radio communication base station to allow the mobile without cutting.

  (2-1) The radio communication base station according to the embodiment is configured to receive radio packets in addition to the first frequency channel in a radio communication base station that can simultaneously communicate with two or more frequency channels using a plurality of modulation and coding schemes. An identifier of the second frequency channel in a possible state and a modulation and coding scheme used in the second frequency channel are notified by the first frequency channel, a connection request from the wireless communication terminal is received by the first frequency channel, The modulation and coding scheme that can be used in the first frequency channel of the wireless communication terminal notified from the wireless communication terminal when permitted is held in the connection management table together with the identifier of the wireless communication terminal and the identifier of the frequency channel, and When a notification of a modulation and coding method that can be used in the second frequency channel is received from the wireless communication terminal, the connection management table indicates the second frequency channel. Modulation and coding scheme information that can be used in the second frequency channel of the wireless communication terminal and the bespoke is added in association with the identifier of the wireless communication terminal, and the second frequency channel from the wireless communication terminal is added to the second frequency channel. When the change request is received, it is determined from the identifier of the wireless communication terminal whether the modulation and coding scheme that can be used by the wireless communication terminal on the connection management table is usable in the second frequency channel. In this case, among the modulation and coding schemes used in the second frequency channel, the wireless communication terminal uses the modulation and coding scheme that can be used by the wireless communication terminal on the connection management table from the identifier of the wireless communication terminal. A wireless communication base station that communicates with a communication terminal.

<Effect of (2-1)>
Notification regarding modulation and coding scheme usable in the second frequency channel in the wireless communication terminal by additionally notifying the modulation and coding scheme usable in the second frequency channel after setting in the first frequency channel It is possible to give a grace to prepare a frame, reduce the load at the time of setting connection, and obtain the same effect as described above, such as being able to continue communication without resetting after changing the channel.

  (2-2) The radio communication base station according to the embodiment is the radio communication base station described in (2) or (2-1) above, and is a modulation and coding scheme that can be used from the radio communication terminal permitted to connect. The wireless communication base station updates the information in the corresponding connection management table when receiving a re-notification or a re-notification of an available frequency channel and a usable modulation and coding scheme.

<Effect of (2-2)>
Communicating with an appropriate modulation and coding method corresponding to the communication state at the wireless communication terminal by receiving the re-notification of the usable modulation and coding method from the wireless communication terminal and updating the information in the connection management table Can do.

  (3-1) A radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2), or (2-1), wherein the second frequency channel The wireless communication base station is characterized in that the communication method or modulation and coding method used in the above is notified on the second frequency channel.

<Effect of (3-1)>
By notifying on the second frequency channel of the communication scheme or modulation and coding scheme used in the second frequency channel, the radio communication is performed to another radio communication base station or radio communication terminal capable of receiving on the second frequency channel. It is possible to recognize what communication method or modulation and coding method is used by the communication base station in the second frequency channel. Further, by recognizing the above, other wireless communication base stations and wireless communication terminals can take measures to avoid interference. Furthermore, by recognizing the above, the wireless communication terminal can be a candidate for a wireless communication base station to which the wireless communication base station is connected.

  (3-2) A radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2), or (2-1), wherein the first frequency channel The wireless communication base station is configured to notify that the same wireless communication base station is in the second frequency channel.

<Effect of (3-2)>
Notifying on the second frequency channel that the same radio communication base station is operating on the first and second frequency channels by notifying the identifier of the radio communication base station on the second frequency channel Can do. Further, by recognizing the above, other wireless communication base stations and wireless communication terminals can take measures to avoid interference. Further, wireless communication is performed by recognizing the wireless communication base station by a wireless communication terminal that communicates with the wireless communication base station using the first frequency channel, changes to the second frequency channel, and communicates with the wireless communication base station again. Packets can be sent.

  (3-2-1-1) The wireless communication base station according to the embodiment is the wireless communication base station described in (3-2) above, and is connected by one of the frequency channels in a state where wireless packet transmission / reception is possible. A radio communication base station that transmits radio packets addressed to all or some of a plurality of radio communication terminals of all radio communication terminals through all frequency channels capable of transmitting and receiving radio packets.

<Effect of (3-2-1-1)>
By transmitting wireless packets addressed to a plurality of wireless communication terminals using all frequency channels that can transmit and receive wireless packets, it is possible to reliably transmit wireless packets to a destination wireless communication terminal that may move through the frequency channels. In addition, it is not necessary to accurately specify the connected frequency channel including the movement of the frequency channel of the transmission destination wireless communication terminal at the time of wireless packet transmission at the wireless communication base station, and the processing load can be reduced.

  (3-2-1-2) The wireless communication base station according to the embodiment is the wireless communication base station described in (3-2-1-1) above, and is all or part of the wireless communication terminals. The wireless packet addressed to a plurality of wireless communication terminals is a wireless communication base station characterized by putting the same value in the field indicating the order of transmission numbers when transmitting through all frequency channels capable of transmitting and receiving wireless packets. .

<Effect of (3-2-1-2)>
When transmitting the same wireless packet addressed to multiple wireless communication terminals on multiple frequency channels, the transmission timing between multiple frequency channels may be shifted by putting the same value in the field indicating the order of the transmission numbers. For example, a wireless communication terminal that moves between frequency channels in the meantime or a wireless communication terminal that can receive signals on multiple frequency channels can identify the same packet even if it is received on multiple frequency channels. Can do.

  (3-2-2-1) The radio communication base station according to the embodiment is the radio communication base station described in (3-2) above, and the radio packet used for notification can be communicated only on a single frequency channel. A first field indicating an identifier of a radio communication base station used also in another radio communication base station and a second field different from the first field are provided, and an identifier different for each frequency channel is entered in the first field. In this field, an identifier indicating that the radio communication base stations are the same between frequencies is entered.

<Effect of (3-2-2-1)>
By notifying that it is the same radio communication base station as the first frequency channel in a field different from the field indicating the identifier of the radio communication base station used in the radio communication base station capable of communicating only with a single frequency channel When the notification is received by a wireless communication terminal that can be connected only to a wireless communication base station that can communicate only with a single frequency channel, it can be recognized as another wireless communication base station and can be connected, A wireless communication terminal that can be connected to a wireless communication base station that can communicate with a plurality of frequency channels can be recognized and connected as the same wireless communication base station.

  (4) The radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2), or (2-1), and is used in the first frequency channel. The radio communication base station is characterized in that the communication scheme or modulation and coding scheme to be notified is notified on the first frequency channel.

<Effect of (4)>
By notifying on the first frequency channel the communication scheme or modulation and coding scheme to be used in the first frequency channel, the radio communication base station operates in the first and second frequency channels in the first frequency channel. And other communication base stations or wireless communication terminals that can receive wireless packets on the first frequency channel, and what communication method or modulation and coding method is used on the first frequency channel. Can be made. Further, by recognizing the above, other wireless communication base stations and wireless communication terminals can take measures to avoid interference. Furthermore, by recognizing the above, the wireless communication terminal can be a candidate for a wireless communication base station to which the wireless communication base station is connected.

  (5) The wireless communication base station according to the embodiment is the wireless communication base station described in (1), (1-1), (2), or (2-1), and an identifier of the wireless communication terminal is The wireless communication base station is a management number assigned to a wireless communication terminal when the wireless communication base station permits connection of the wireless communication terminal.

<Effect of (5)>
When the wireless communication base station permits the wireless communication terminal to connect, the management number assigned to the wireless communication terminal is retained in the connection management table as an identifier of the wireless communication terminal. Identification can be performed using the identifier, and management of the wireless communication terminal can be simplified.

  (6) The radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2), or (2-1), and transmits for each frequency channel. A queue for storing wireless packets, and when the wireless communication terminal permits a change request from the first frequency channel to the second frequency channel, the wireless packet addressed to the wireless communication terminal is transmitted to the first frequency channel; The wireless communication base station is characterized in that it is shifted from the first queue to the second queue for the second frequency channel.

<Effect of (6)>
There is a queue for storing radio packets for each frequency channel, and in response to a frequency channel change request of a radio communication terminal, the radio packet addressed to the radio communication terminal is moved to the transmission queue of the corresponding frequency channel to The wireless packet addressed to the wireless communication terminal can be transmitted on an appropriate frequency channel with which the wireless communication terminal moving on the mobile station communicates.

  (7) The radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2), or (2-1), and is the second radio communication terminal. When a change request to the frequency channel is permitted, the wireless communication base station starts communication with the wireless communication terminal on the second frequency channel after a fixed time or more has passed since the permission.

<Effect of (7)>
Communication on the frequency channel to which the radio communication base station and the radio communication terminal have been changed by starting communication with the radio communication terminal on the frequency channel to which the radio communication terminal has been changed after a fixed time has passed since the request to change the frequency channel of the radio communication terminal. You can give grace to start preparations.

  (7-1) The radio communication base station according to the embodiment is the radio communication base station described in (7) above, wherein the fixed time is set to be equal to or longer than a time required for frequency channel movement by the radio communication terminal. This is a featured radio communication base station.

<Effect of (7-1)>
Guarantee that the wireless communication terminal is ready to receive on the changed frequency channel by starting communication with the changed frequency channel after the time required for the movement of the frequency channel in the wireless communication terminal has elapsed. Thus, transmission of a wireless packet can be started.

  (7-1-1) A wireless communication base station according to the embodiment is the wireless communication base station described in (7-1) above, and before the change to the second frequency channel is permitted, from the wireless communication terminal. The wireless communication base station is characterized in that the time required for changing the frequency channel is acquired.

<Effect of (7-1-1)>
By acquiring the time required for changing the frequency channel from the wireless communication terminal before permitting the change to the second frequency channel, the time required for moving the frequency channel in the wireless communication terminal can be accurately grasped and more By starting communication with the wireless communication terminal on the change destination frequency channel, it is possible to improve the accuracy of guaranteeing that the wireless communication terminal is in a state where reception is possible on the change destination frequency channel.

  (7-2) The wireless communication base station according to the embodiment is the wireless communication base station described in (6) above, and when the wireless communication terminal permits a change request to the second frequency channel, the permission is granted. The wireless communication base station starts communication with the wireless communication terminal on the second frequency channel after a time required for moving the wireless packet from the first queue to the second queue is exceeded. It is a base station.

<Effect of (7-2)>
By starting communication with the wireless communication terminal on the frequency channel of the change destination after the time required for movement between the queues of the wireless packets addressed to the wireless communication terminal at the wireless communication base station has elapsed, the wireless packet addressed to the wireless communication terminal is reliably It can be transmitted to the wireless communication terminal using the frequency channel to be changed.

  (7-3) The wireless communication base station according to the embodiment is the wireless communication base station described in (7) above, wherein the fixed time is determined with the wireless communication terminal before permitting the change to the second frequency channel. The wireless communication base station is determined by exchanging wireless packets between the wireless communication base stations.

<Effect of (7-3)>
By determining the time until the start of communication on the changed frequency channel with the wireless communication terminal by exchanging wireless packets, the wireless communication base station and the wireless communication terminal can reliably communicate on the changed frequency channel. It is possible to guarantee the start of communication after reaching a certain state.

  (8) The radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2) or (2-1), and uses the second frequency channel. The wireless communication base station is characterized in that the rate is reported in the first frequency channel.

<Effect of (8)>
By notifying the usage rate of another frequency channel, the wireless communication terminal can be provided with information for determining the transition to another frequency channel.

  (9) The radio communication base station according to the embodiment is the radio communication base station described in (1), (1-1), (2), or (2-1), and the second frequency channel The wireless communication base station is characterized in that the second bandwidth, which is the width, is notified by the first frequency channel.

<Effect of (9)>
By notifying the bandwidth of another frequency channel, the wireless communication terminal can determine whether the other frequency channel is a bandwidth that allows the wireless communication terminal to communicate.

  (10) A radio communication base station according to the embodiment is the radio communication base station according to (1), (1-1), (2), or (2-1), and the first frequency channel When security information set when communicating with a wireless communication terminal is stored in a connection management table in association with the identifier of the wireless communication terminal, and a change request to the second frequency channel from the wireless communication terminal is permitted A wireless communication base station that communicates with the wireless communication terminal on a second frequency channel using the held security information.

<Effect of (10)>
When security information is managed together with the identifier of the wireless communication terminal and a change request to another frequency channel is permitted, the same security information is used in the change destination frequency channel, so that the security setting is again set in the change destination frequency channel. Communication can be started even if it is not performed.

  (10-1) A wireless communication base station according to the embodiment is the wireless communication base station described in (10) above, and the wireless communication terminal notified from the wireless communication terminal in the first frequency channel can be used. Is stored in the connection management table in correspondence with the identifier of the wireless communication terminal, and when the wireless communication terminal makes a change request to the second frequency channel, the wireless communication is performed on the second frequency channel from the connection management table. The wireless communication base station is characterized in that it is used for judgment of permission by referring to whether the security method required by the base station is supported.

<Effect of (10-1)>
By identifying the security method that can be used by the wireless communication terminal before requesting to change to another frequency channel and using it to determine whether or not to permit when a request to change to another frequency channel is received, another frequency channel can be used. The wireless communication terminal can receive a connection request from a wireless communication terminal that is known to be rejected by another frequency channel when the security method required by the wireless communication base station is not satisfied. By grasping in advance, it is possible to reduce the occupation of the frequency channel by exchanging wireless packets for useless connection. Further, when the change of the radio communication terminal to another frequency channel is permitted, the information on the security method notified from the radio communication terminal can be used for communication with the radio communication terminal on the changed frequency channel.

  (10-1-1) The radio communication base station according to the embodiment is the radio communication base station described in (10-1) above, and when the change request to the second frequency channel is permitted, If the first security method used in the frequency channel can be used in the second frequency channel, it communicates with the wireless communication terminal in the second frequency channel using information on the security settings that are held, When the first security scheme is not usable on the second frequency channel, the radio communication base station uses the second frequency channel from among the security schemes that can be used by the radio communication terminal on the second frequency channel from the connection management table. Any one of the security methods required in the above is used as the second security method, and the wireless communication terminal and the security are used in the second frequency channel. A wireless communication base station, characterized in that for setting the second security system before starting the communication using the equation.

<Effect of (10-1-1)>
If the security method before the frequency channel change can be used in the frequency channel after the change, by using the same security information for communication, the radio packet for re-setting to use the security method after the frequency channel change The exchange can be omitted, and the security method before changing the frequency channel cannot be used on the changed frequency channel, but if there is a security method supported by the wireless communication terminal in the security method required by the wireless communication base station, either By performing one setting with the wireless communication terminal on the changed frequency channel, the security required by the wireless communication base station on the changed frequency channel can be maintained.

  (10-2) The radio communication base station according to the embodiment is the radio communication base station described in (10-1) above, and notifies the security method requested in the second frequency channel through the first frequency channel. This is a radio communication base station.

<Effect of (10-2)>
By notifying the security level required for another frequency channel, it is possible to change the security level required for another frequency channel and determine whether the other frequency channel is a security method supported by the radio communication terminal. Can be made.

  (11) The wireless communication terminal according to the embodiment is a wireless communication terminal that can communicate on two or more frequency channels and performs communication by selecting at least one of the frequency channels. When a communication system that can be used in the first and second frequency channels of the wireless communication terminal is notified to the wireless communication base station that can simultaneously communicate using the first frequency channel, and the connection is permitted from the wireless communication base station Communicates with the radio communication base station using the first frequency channel, and communicates with the radio communication base station using the second frequency channel when the change from the radio communication base station to the second frequency channel is permitted. This is a wireless communication terminal.

<Effect of (11)>
By notifying the communication method that can be used in the second frequency channel in the first frequency channel, the wireless communication base station connected in the first frequency channel uses the second frequency channel of the wireless communication terminal in advance. The usable communication method can be grasped, and communication can be started without performing notification of connection information necessary for communication on the second frequency channel again.

  (11-1) The wireless communication terminal according to the embodiment is capable of performing communication using two or more frequency channels, and in the wireless communication terminal that performs communication by selecting at least one of the first and second frequencies. When a wireless communication base station capable of simultaneous communication on a channel is notified of a communication method usable on the first frequency channel of the wireless communication terminal on the first frequency channel, and the connection is permitted from the wireless communication base station Communicates with the radio communication base station on the first frequency channel, notifies the communication method that can be used on the second frequency channel during the communication, and is permitted to change from the radio communication base station to the second frequency channel. In this case, the wireless communication terminal performs communication with the wireless communication base station using the second frequency channel.

<Effect of (11-1)>
A notification frame regarding a communication method usable in the second frequency channel in the wireless communication terminal is prepared by additionally notifying the communication method usable in the second frequency channel after connection in the first frequency channel. It is possible to give a grace period, reduce the load at the time of connection setting, and obtain the same effect as described above, such as being able to continue communication without resetting after changing the channel.

  (11-2) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (11) or (11-1), and the connection permitted when the usable communication method is changed. A wireless communication terminal that performs re-notification of a communication method that can be used for a wireless communication base station or re-notification of an available frequency channel and a usable communication method.

<Effect of (11-2)>
By re-notifying the wireless communication base station of the information when the usable communication method is changed, communication can be performed with an appropriate communication method corresponding to the communication state of the wireless communication terminal.

  (11-3-1) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (11) or (11-1) above, and the communication method is represented by a type of communication standard. It is a wireless communication terminal.

<Effect of (11-3-1)>
By notifying the type of communication standard that can be used in the second frequency channel in the first frequency channel, the second frequency of the wireless communication terminal is connected in advance to the destination wireless communication base station connected in the first frequency channel. The type of communication standard that can be used on the channel can be grasped, and communication can be started without performing notification of connection information necessary for communication on the second frequency channel again.

  (11-3-2) The wireless communication terminal according to the embodiment is a wireless communication terminal characterized in that in (11-3-1) above, an extension method within the same communication standard is distinguished by the type of communication standard. is there.

<Effect of (11-3-2)>
By notifying the type of extension method within the same communication standard that can be used in the second frequency channel in the first frequency channel, the wireless communication terminal is connected in advance to the wireless communication base station connected in the first frequency channel. The type of extension method within the same communication standard that can be used in the second frequency channel can be grasped, and communication is started without re-notifying the connection information necessary for communication in the second frequency channel. can do.

  (12) A wireless communication terminal according to the embodiment is capable of communicating with two or more frequency channels using a plurality of modulation and coding schemes, and a plurality of wireless communication terminals that perform communication by selecting at least one of them. When a connection request is transmitted on the first frequency channel to a radio communication base station that can simultaneously communicate on the first and second frequency channels using the modulation and coding scheme of Modulation codes that can be used in the radio communication terminal among the modulation and coding schemes in the second frequency channel notified from the radio communication base station on at least the first frequency channel in addition to the possible modulation and coding schemes Modulation and coding scheme that can be used by the radio communication terminal in the first frequency channel when the connection is permitted by a response from the radio communication base station To communicate with the radio communication base station using the first frequency channel, transmit a request to change to the second frequency channel to the radio communication base station, and send a second request based on a response from the radio communication base station. When the change to the frequency channel is permitted, the radio communication terminal communicates with the radio communication base station on the second frequency channel using the modulation and coding scheme notified that the radio communication terminal can use the second frequency channel. A wireless communication terminal characterized by the above.

<Effect of (12)>
The first and second frequency channels simultaneously use the first and second frequency channels by notifying the first and second frequency channels that can be used in the second frequency channel at the time of connection. In order to allow a communicable radio communication base station to grasp in advance the modulation and coding scheme that can be used in the second frequency channel of the radio communication terminal in the first frequency channel, and to communicate in the second frequency channel Communication can be started without performing notification of necessary connection information again. In addition, by transmitting a request from the wireless communication terminal at the time of connection and channel change, and receiving a response to the request from the wireless communication base station, it is possible to guarantee matching of connection information between the wireless communication terminal and the wireless communication base station. .

  (12-1) A radio communication terminal according to the embodiment is capable of communicating with two or more frequency channels using a plurality of modulation and coding schemes, and selecting at least one of them and performing communication , To a radio communication base station capable of simultaneously communicating on the first and second frequency channels using a plurality of modulation and coding schemes, the modulation and coding scheme usable on the first frequency channel of the radio communication terminal is set to the first frequency When the channel is notified and the connection is permitted by a response from the radio communication base station, the radio communication terminal uses the modulation and coding scheme that can be used by the radio communication terminal on the first frequency channel. Communicates with the communication base station, notifies the modulation and coding scheme that can be used in the second frequency channel during the communication, and changes the radio communication base station to the second frequency channel When a change to the second frequency channel is permitted by a response from the wireless communication base station, the modulation and coding scheme notified that the wireless communication terminal can be used on the second frequency channel is used. A wireless communication terminal that communicates with the wireless communication base station using the second frequency channel.

<Effect of (12-1)>
A notification frame relating to a modulation and coding scheme usable in the second frequency channel in the wireless communication terminal by additionally notifying the modulation and coding scheme usable in the second frequency channel after connection in the first frequency channel As described above, it is possible to reduce the load during connection setting and to obtain the same effect as described above such that communication can be continued without resetting after channel change.

  (12-2) The wireless communication terminal according to the embodiment is the wireless communication terminal described in the above (12) or (12-1), and connection is permitted when a usable modulation and coding scheme is changed. Further, the present invention is a radio communication terminal that performs re-notification of a modulation and coding scheme that can be used for the radio communication base station or re-notification of a usable frequency channel and a usable modulation and coding scheme.

<Effect of (12-2)>
When the usable modulation and coding scheme is changed, it is possible to communicate with the appropriate modulation and coding scheme corresponding to the communication state at the radio communication terminal by re-notifying the radio communication base station of the information concerned. it can.

  (13) The wireless communication terminal according to the embodiment is the wireless communication terminal described in (11), (11-1), (12), or (12-1), and is capable of communicating using a single frequency channel When connecting to the radio communication base station using the first frequency channel, the communication scheme or modulation coding scheme usable in the first frequency channel is notified, and when connection is permitted from the radio communication base station, Communicate with the corresponding radio communication base station using one frequency channel, and when switching to the second frequency channel, it is possible to search for and connect to another radio communication base station operating on the second frequency channel. When a wireless communication base station is detected, the wireless communication base station is notified of a communication method or a modulation and coding method that can be used in the second frequency channel and issues a connection request. Communication end It is.

<Effect of (13)>
In addition to being able to connect to a wireless communication base station that can communicate simultaneously on two or more frequency channels, it can also be connected to a wireless communication base station that can communicate on a single frequency channel, expanding the choice of communication destinations Even if connected to a wireless communication base station that can communicate with a single frequency channel, if a transition request is generated for the second frequency channel, a wireless communication base station that can be connected with the second frequency channel is searched and detected. In this case, it is possible to notify a communication method or modulation and coding method that can be used in the second frequency channel, issue a connection request, and connect to a radio communication base station that operates in the second frequency channel.

  (14) The wireless communication terminal according to the embodiment is the wireless communication terminal described in (11), (11-1), (12), or (12-1), and when channel change is not permitted. Transition to the second frequency channel, search for other radio communication base stations operating there, and when other radio communication base stations that can be connected are detected, the second frequency channel is transferred to the other radio communication base station The wireless communication terminal is characterized by issuing a connection request by notifying the communication method or modulation and coding method that can be used in the network.

<Effect of (14)>
Connect to a wireless communication base station that can simultaneously communicate with two or more frequency channels, and connect to the second frequency channel when the wireless communication base station is not permitted to move to the second channel. When a radio communication base station is searched and detected, another radio communication base station operating in the second frequency channel is notified by notifying the communication method or modulation and coding method usable in the second frequency channel and issuing a connection request. Can be connected to. Moreover, by doing in this way, the choice of the radio | wireless communication base station which can communicate can be expanded.

  (15) The wireless communication terminal according to the embodiment is the wireless communication terminal described in (11), (11-1), (12), or (12-1), and is shifted to the third frequency channel. When a request occurs, the mobile station shifts to the third frequency channel, searches for another radio communication base station operating there, and detects another radio communication base station that can be connected to the other radio communication base. A wireless communication terminal that issues a connection request by notifying a station of a communication method or modulation and coding method that can be used in a third frequency channel.

<Effect of (15)>
When a request to shift to another third frequency channel that is not supported by the same wireless communication station occurs, the third frequency channel is connected to a wireless communication station that can simultaneously communicate with two or more frequency channels. When a wireless communication base station that can be connected is searched for and detected, a communication method or modulation and coding method that can be used in the third frequency channel is notified, a connection request is issued, and wireless communication that operates in the third frequency channel Can connect to a base station. Moreover, by doing in this way, the choice of the radio | wireless communication base station which can communicate can be expanded.

  (16) A wireless communication terminal according to the embodiment is the wireless communication terminal according to (11), (11-1), (12), or (12-1) described above, and the second wireless communication terminal When receiving a permission for a change request to a frequency channel, the wireless communication terminal starts communication with the wireless communication base station on a second frequency channel after a fixed time or more has passed since the permission.

<Effect of (16)>
The frequency of the change destination of the radio communication terminal and the radio communication base station is started by starting communication with the radio communication base station on the frequency channel of the change destination after a fixed time or more from the permission to the frequency channel change request from the radio communication base station. It is possible to give a grace to preparations for starting communication on the channel.

  (16-1) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (16) above, wherein the fixed time is set to be equal to or longer than a time required for frequency channel movement in the wireless communication terminal. Is a wireless communication terminal.

<Effect of (16-1)>
After the time required for the movement of the frequency channel in the wireless communication terminal has passed, the wireless communication terminal starts communication with the wireless communication base station using the change-destination frequency channel. Communication can be surely started.

  (16-1-1) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (16-1) above, and receives the change permission to the second frequency channel before receiving the permission to change to the second frequency channel. The wireless communication terminal is characterized by notifying the time required for changing the frequency channel.

<Effect of (16-1-1)>
By notifying the radio communication base station of the time required for changing the frequency channel before permitting the change to the second frequency channel, the time required for moving the frequency channel in the radio communication terminal is accurately indicated to the radio communication base station. After that, the transmission to the wireless communication terminal of the wireless communication base station can be started on the changed frequency channel.

  (16-2) A wireless communication terminal according to the embodiment is the wireless communication terminal according to (16), wherein the fixed time is a time specified by the wireless communication base station. It is a terminal.

<Effect of (16-2)>
Period of preparation for start of communication accompanying the change of the frequency channel of the radio communication terminal in the radio communication base station by starting communication with the radio communication base station on the frequency channel of the change destination after the time specified by the radio communication base station has elapsed Thus, it is possible to reliably start communication with the radio communication base station and the changed frequency channel.

  (16-3) A wireless communication terminal according to the embodiment is the wireless communication terminal according to (16) above, wherein the fixed time is determined with the wireless communication base station before receiving permission to change to the second frequency channel. The wireless communication terminal is determined by exchanging wireless packets between them.

<Effect of (16-3)>
The time until the start of communication in the change destination frequency channel with the radio communication base station is determined by exchanging radio packets, so that the radio communication terminal and the radio communication base station can be surely connected in the change destination frequency channel. It is possible to guarantee the start of communication after communication is possible.

  (17) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (11), (11-1), (12), or (12-1), wherein the usage rate of the second frequency channel is set. The wireless communication terminal is characterized in that it acquires from the wireless communication base station and determines whether or not to transmit a request for shifting to the second frequency channel.

<Effect of (17)>
By using the usage rate of the second frequency channel to determine whether to transmit a request to shift to the second frequency channel, it is possible to guarantee communication when shifting to the second frequency channel.

  (18) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (11), (11-1), (12), or (12-1), and has a bandwidth of a second frequency channel. The wireless communication terminal is characterized in that a certain second bandwidth is acquired from the wireless communication base station, and a determination is made as to whether or not a request for shifting to the second frequency channel is transmitted.

<Effect of (18)>
By using the bandwidth of another frequency channel for determining whether to transmit a request to shift to the second frequency channel, it is possible to guarantee communication when shifting to the second frequency channel.

  (19) A wireless communication terminal according to the embodiment is the wireless communication terminal described in (11), (11-1), (12), or (12-1), and is configured to use the first and second frequency channels. A wireless communication terminal that notifies a wireless communication base station of a usable security method using a first frequency channel.

<Effect of (19)>
By notifying the wireless communication base station in advance of the security methods that can be used in another frequency channel, it is determined whether or not the wireless communication base station is permitted when the wireless communication terminal requests to change to another frequency channel. In addition, the information about the security method notified in the case of permission can be used for communication with the wireless communication terminal in the frequency channel after the change.

  (21) The wireless communication system according to the embodiment is capable of communicating with a wireless communication base station capable of simultaneously communicating with two or more frequency channels, and capable of communicating with two or more frequency channels, and selecting at least one of them. The wireless communication base station includes a communication channel used in the second frequency channel and the identifier of the frequency channel of love 2 in a state where radio packets can be received in addition to the first frequency channel. 1 is used to notify the radio communication base station of communication schemes that can be used in the first and second frequency channels of the radio communication terminal. The communication base station determines a communication method that can be used by the wireless communication terminal notified from the wireless communication terminal when the connection of the wireless communication terminal is permitted. When the wireless communication terminal holds the identifier and the frequency channel identifier in the connection management table and permits a change request to the second frequency channel from the wireless communication terminal, the wireless communication terminal of the communication method used in the second frequency channel It communicates with the wireless communication terminal on the second frequency channel using a communication method that can be used by the wireless communication terminal on the connection management table from the identifier, and the wireless communication terminal is notified from the wireless communication base station. The communication method used in the second frequency channel is stored in the connection management table together with the frequency channel identifier, and when a change request to the second frequency channel is permitted from the radio communication base station, the second frequency channel Of the usable communication methods, the second frequency channel is set using the communication method used by the wireless communication base station on the connection management table. It is a wireless communication system and performs communication with the wireless communication base station Le.

<Effect of (21)>
The wireless communication base station notifies the wireless communication terminal that transmits and receives on the first frequency channel by notifying the communication method used in the second frequency channel on the first frequency channel. The wireless communication terminal can recognize the communication method that can be used in the second frequency channel in the first frequency channel to the wireless communication base station to which the wireless communication terminal is connected. It is possible to make the station know in advance the communication methods that can be used in the second frequency channel of the wireless communication terminal. As a result, the wireless communication base station and the wireless communication terminal grasp each other in advance the communication method to be used in the second frequency channel, and do not exchange connection information necessary for communication again when moving to the second frequency channel. Communication can be started.

  (21-1) The wireless communication system according to the embodiment can communicate with a wireless communication base station that can simultaneously communicate with two or more frequency channels, and can select at least one of the two or more frequency channels. The wireless communication base station comprises a communication method used in the second frequency channel and the identifier of the frequency channel of love 2 that is in a wireless packet receivable state in addition to the first frequency channel. And the wireless communication terminal notifies the wireless communication base station of a communication method that can be used in the first frequency channel of the wireless communication terminal in the first frequency channel, and the wireless communication terminal When the connection is permitted from the radio communication base station, it communicates with the radio communication base station on the first frequency channel and can be used on the second frequency channel during the communication. A communication method usable in the first frequency channel of the wireless communication terminal notified from the wireless communication terminal when the connection of the wireless communication terminal is permitted. A wireless communication terminal identifier and a frequency channel identifier are stored in a connection management table, and when a notification of a communication method that can be used in a second frequency channel is received from the wireless communication terminal, the connection management table stores the second frequency channel An identifier and information on a communication method that can be used in the second frequency channel of the wireless communication terminal are added in association with the identification of the wireless communication terminal, and a change request to the second frequency channel from the wireless communication terminal If permitted, use of the wireless communication terminal on the connection management table from the identifier of the wireless communication terminal among the communication methods used in the second frequency channel A wireless communication terminal that communicates with the wireless communication terminal on a second frequency channel using an active communication method, and the wireless communication terminal wirelessly communicates with the communication method used on the second frequency channel notified from the wireless communication base station. A communication method that is stored in the connection management table together with the identifier of the base station and the identifier of the frequency channel, and that can be used in the second frequency channel when the wireless communication terminal is permitted to change to the second frequency channel. A wireless communication system, wherein a communication method used by the wireless communication base station on a connection management table is used to communicate with the wireless communication base station using a second frequency channel.

<Effect of (21-1)>
A notification frame related to a communication method that can be used in the second frequency channel in the wireless communication terminal by additionally notifying the communication method that can be used in the second frequency channel after the wireless communication terminal is connected in the first frequency channel. As described above, it is possible to reduce the load during connection setting and to obtain the same effect as described above such that communication can be continued without resetting after channel change.

  (21-2) The wireless communication system according to the embodiment is the wireless communication system according to (21) or (21-1) described above, and when the communication method that the wireless communication terminal can use is changed, Re-notification of usable communication method to the wireless communication base station permitted to connect or re-notification of usable frequency channel and usable communication method, the wireless communication base station from the wireless communication terminal permitted to connect The wireless communication system is characterized in that when a re-notification of an available communication method or a re-notification of an available frequency channel and an available communication method is received, information in a corresponding connection management table is updated.

<Effect of (21-2)>
When the communication method that can be used by the wireless communication terminal is changed, the information is re-notified to the wireless communication base station, so that the wireless communication terminal and the wireless communication terminal are wirelessly connected with an appropriate communication method corresponding to the communication state of the wireless communication terminal. A communication base station can perform communication.

  (21-3-1) A wireless communication system according to the embodiment is the wireless communication system according to (21), wherein the communication method is represented by a type of communication standard.

<Effect of (21-3-1)>
The wireless communication base station notifies the type of communication standard used in the second frequency channel in the first frequency channel, so that the wireless communication base station transmits the second frequency to the wireless terminal performing transmission / reception in the first frequency channel. The type of communication standard used in the channel can be grasped, and the wireless communication terminal notifies the connected wireless communication base station of the type of communication standard usable in the second frequency channel in the first frequency channel. Thus, it is possible to cause the radio communication base station to grasp in advance the types of communication standards that can be used in the second frequency channel of the radio communication terminal. As a result, the wireless communication base station and the wireless communication terminal grasp each other in advance the type of communication standard to be used in the second frequency channel, and exchange the connection information necessary for communication again when moving to the second frequency channel. Communication can be started without performing it.

  (21-3-2) The wireless communication system according to the embodiment is the wireless communication system according to (21-3-1) described above, and the type of communication standard distinguishes an extension method within the same communication standard. A wireless communication system is characterized.

<Effect of (21-3-2)>
The radio communication base station notifies the radio terminal that performs transmission / reception on the first frequency channel by notifying the type of the extension method within the communication standard used in the second frequency channel on the first frequency channel. The type of the extension method within the communication standard used in the second frequency channel can be grasped, and the wireless communication terminal can use the first frequency channel and the type of the extension method within the communication standard usable in the second frequency channel. Is notified to the connection-destination radio communication base station, it is possible to cause the radio communication base station to know in advance the type of the extension method within the communication standard that can be used in the second frequency channel of the radio communication terminal. As a result, the wireless communication base station and the wireless communication terminal grasp each other in advance the type of extension method within the communication standard to be used in the second frequency channel, and connection information necessary for communication when moving to the second frequency channel. The communication can be started without performing the exchange again.

  (22) The radio communication system according to the embodiment includes a radio communication base station capable of simultaneously communicating with two or more frequency channels using a plurality of modulation and coding schemes, and two or more frequencies using a plurality of modulation and coding schemes. The wireless communication base station is configured to include a second wireless communication terminal capable of receiving a wireless packet in addition to the first frequency channel. The first frequency channel notifies the frequency channel identifier and the modulation and coding scheme used in the second frequency channel, and the radio communication terminal transmits a connection request to the radio communication base station via the first frequency channel. In addition to the modulation and coding scheme that can be used on the first frequency channel of the radio communication terminal, the radio communication base station at least on the first frequency channel Of the modulation and coding schemes in the second frequency channel notified by the wireless communication terminal, the wireless communication base station receives a connection request from the wireless communication terminal. The modulation and coding scheme usable by the wireless communication terminal notified from the wireless communication terminal when permitted is held in the connection management table together with the identifier of the wireless communication terminal and the identifier of the frequency channel. When receiving a change request to the second frequency channel, it is determined whether the modulation and coding scheme usable by the wireless communication terminal on the connection management table can be used in the second frequency channel from the identifier of the wireless communication terminal, When it is determined to be usable and permitted, the identifier of the frequency channel is updated to the identifier of the second frequency channel and held, and used in the second frequency channel. The wireless communication terminal communicates with the wireless communication terminal on a second frequency channel using the modulation and coding method that can be used by the wireless communication terminal on the connection management table from the identifier of the wireless communication terminal among the key encoding methods, and the wireless communication The terminal stores the modulation and coding scheme used in the second frequency channel notified from the radio communication base station in the connection management table together with the frequency channel identifier, and changes the radio communication base station to the second frequency channel. When the request is transmitted and the change to the second frequency channel is permitted by the response from the radio communication base station, the radio on the connection management table among the modulation and coding schemes usable in the second frequency channel A wireless communication system, wherein communication with the wireless communication base station is performed on a second frequency channel using a modulation and coding scheme used by the communication base station The

<Effect of (22)>
The radio communication base station notifies the radio communication terminal that transmits and receives on the first frequency channel to the second radio communication base station by notifying the modulation and coding scheme used in the second frequency channel on the first frequency channel. The modulation and coding scheme used in the frequency channel can be grasped, and the radio communication terminal notifies the connected radio communication base station of the modulation and coding scheme that can be used in the second frequency channel in the first frequency channel. This allows the radio communication base station to know in advance the modulation and coding scheme that can be used in the second frequency channel of the radio communication terminal. As a result, the radio communication base station and the radio communication terminal grasp each other in advance the modulation and coding scheme to be used in the second frequency channel, and exchange the connection information necessary for communication again when moving to the second frequency channel. Communication can be started without performing it.

  In addition, when a connection is made or when a channel is changed, a request is transmitted from the wireless communication terminal, and a response to the request is transmitted by the wireless communication base station, thereby guaranteeing that the connection information matches between the wireless communication terminal and the wireless communication base station. it can.

  (22-1) The radio communication system according to the embodiment includes a radio communication base station capable of simultaneously communicating with two or more frequency channels using a plurality of modulation and coding schemes, and two or more using a plurality of modulation and coding schemes. The radio communication base station is configured to include a first frequency channel identifier and a modulation used in the first frequency channel. In addition to the encoding method and the first frequency channel, the identifier of the second frequency channel that is in a state where radio packets can be received and the modulation and coding method used in the second frequency channel are notified on the first frequency channel, and the radio When a communication terminal transmits a connection request on the first frequency channel to the radio communication base station, the modulation that can be used on the first frequency channel of the radio communication terminal The wireless communication base station can use the first frequency channel of the wireless communication terminal notified from the wireless communication terminal when receiving and permitting the connection request from the wireless communication terminal. A wireless communication terminal and a frequency channel identifier in a connection management table, and when the wireless communication terminal is permitted to connect by a response from the wireless communication base station, the wireless communication base station The modulation and coding schemes used in the first and second frequency channels notified from the above are held in the connection management table together with the frequency channel identifiers, and on the connection management table among the modulation and coding schemes usable in the first frequency channel. Communicating with the radio communication base station on the first frequency channel using the modulation and coding scheme used by the radio communication base station Notifying a modulation and coding scheme usable in the radio communication terminal among modulation and coding schemes in the second frequency channel notified from the radio communication base station on at least the first frequency channel, and performing the radio communication When the base station receives a notification of the modulation and coding scheme that can be used in the second frequency channel from the wireless communication terminal, the base station identifies the second frequency channel identifier and the second frequency channel of the wireless communication terminal in the connection management table. Information corresponding to the identifier of the wireless communication terminal is added, and when a change request to the second frequency channel is received from the wireless communication terminal, a connection is made from the identifier of the wireless communication terminal. When the modulation coding scheme that can be used by the wireless communication terminal on the management table is usable in the second frequency channel, if it is determined that it is usable and permitted, The frequency channel identifier is updated to the identifier of the second frequency channel and held, and the identifier of the wireless communication terminal among the modulation and coding schemes used in the second frequency channel is changed to the wireless communication terminal on the connection management table. Communicating with the wireless communication terminal on a second frequency channel using an available modulation and coding scheme, the wireless communication terminal transmits a change request to the second frequency channel to the wireless communication base station, When change to the second frequency channel is permitted by a response from the radio communication base station, the radio communication base station on the connection management table uses the modulation and coding scheme usable in the second frequency channel. A radio communication system characterized by performing communication with the radio communication base station on a second frequency channel using a modulation and coding scheme.

<Effect of (22-1)>
Modulation coding usable in the second frequency channel in the wireless communication terminal by additionally notifying the modulation coding scheme usable in the second frequency channel after the connection in the first frequency channel after the wireless communication terminal is connected in the first frequency channel It is possible to provide a grace period for preparing a notification frame related to the method, reduce the load at the time of connection setting, and obtain the same effect as described above, such as being able to continue communication without resetting after channel change .

  (22-2) In the wireless communication system according to the above (22) or (22-1), the wireless communication terminal according to the embodiment has the following: Re-notification of a usable modulation and coding scheme to the wireless communication base station permitted to connect or re-notification of an available frequency channel and a usable modulation and coding scheme, and the wireless communication base station permits the connection A wireless communication device that updates information in a corresponding connection management table when receiving a re-notification of a usable modulation and coding scheme from a wireless communication terminal or a re-notification of a usable frequency channel and a usable modulation and coding scheme. It is a communication system.

<Effect of (22-2)>
When the modulation and coding scheme that can be used in the wireless communication terminal is changed, the information is re-notified to the wireless communication base station, so that wireless communication is performed with an appropriate modulation and coding scheme corresponding to the communication state in the wireless communication terminal. A communication terminal and a radio communication base station can communicate.

  (23-1) A wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), wherein the wireless communication base station is The wireless communication system is characterized in that a communication method or a modulation and coding method used in the second frequency channel is notified on the second frequency channel.

<Effect of (23-1)>
By notifying on the second frequency channel of the communication scheme or modulation and coding scheme used in the second frequency channel, the radio communication is performed to another radio communication base station or radio communication terminal capable of receiving on the second frequency channel. It is possible to recognize what communication method or modulation and coding method is used by the communication base station in the second frequency channel. Further, by recognizing the above, other wireless communication base stations and wireless communication terminals can take measures to avoid interference. Furthermore, by recognizing the above, the wireless communication terminal can be a candidate for a wireless communication base station to which the wireless communication base station is connected.

  (23-2) A wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), wherein the wireless communication base station is A radio communication system, characterized in that a second frequency channel notifies that the radio communication base station is the same as one frequency channel.

<Effect of (23-2)>
Notifying on the second frequency channel that the same radio communication base station is operating on the first and second frequency channels by notifying the identifier of the radio communication base station on the second frequency channel Can do. Further, by recognizing the above, other wireless communication base stations and wireless communication terminals can take measures to avoid interference. Further, wireless communication is performed by recognizing the wireless communication base station by a wireless communication terminal that communicates with the wireless communication base station using the first frequency channel, changes to the second frequency channel, and communicates with the wireless communication base station again. Packets can be sent.

  (23-2-1-1) The wireless communication system according to the embodiment is the wireless communication system according to (23-2) above, in which the wireless communication base station is one of the frequency channels in a state where wireless packet transmission / reception is possible. A wireless communication system is characterized in that wireless packets addressed to all or some of a plurality of wireless communication terminals to be connected are transmitted through all frequency channels capable of transmitting and receiving wireless packets.

<Effect of (23-2-1-1)>
By transmitting wireless packets addressed to a plurality of wireless communication terminals using all frequency channels that can transmit and receive wireless packets, it is possible to reliably transmit wireless packets to a destination wireless communication terminal that may move through the frequency channels. In addition, it is not necessary to accurately specify the connected frequency channel including the movement of the frequency channel of the transmission destination wireless communication terminal at the time of wireless packet transmission at the wireless communication base station, and the processing load can be reduced.

  (23-2-1-2) A wireless communication system according to the embodiment is the wireless communication system according to (23-2-1-1) described above, wherein the wireless communication base station is one of the wireless communication terminals. Wireless communication characterized by putting the same value in the field indicating the order of transmission numbers when all or some of the wireless packets addressed to a plurality of wireless communication terminals are transmitted on all frequency channels capable of transmitting and receiving wireless packets. System.

<Effect of (23-2-1-2)>
When transmitting the same wireless packet addressed to multiple wireless communication terminals on multiple frequency channels, the transmission timing between multiple frequency channels may be shifted by putting the same value in the field indicating the order of the transmission numbers. For example, a wireless communication terminal that moves between frequency channels in the meantime or a wireless communication terminal that can receive signals on multiple frequency channels can identify the same packet even if it is received on multiple frequency channels. Can do.

  (23-2-2-1) The wireless communication system according to the embodiment is the wireless communication system according to (23-2), in which the wireless communication base station has a single frequency channel for wireless packets used for notification. A first field indicating an identifier of a radio communication base station used also in a radio communication base station capable of communicating only with the first and a second field different from the first field are provided, and an identifier different for each frequency channel is provided in the first field. In the second field, the wireless communication system is characterized in that an identifier indicating the same wireless communication base station is inserted between frequencies.

<Effect of (23-2-2-1)>
By notifying that it is the same radio communication base station as the first frequency channel in a field different from the field indicating the identifier of the radio communication base station used in the radio communication base station capable of communicating only with a single frequency channel When the notification is received by a wireless communication terminal that can be connected only to a wireless communication base station that can communicate only with a single frequency channel, it can be recognized as another wireless communication base station and can be connected, A wireless communication terminal that can be connected to a wireless communication base station that can communicate with a plurality of frequency channels can be recognized and connected as the same wireless communication base station.

  (25) The wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), and the connection held by the wireless communication base station The identifier of the wireless communication terminal in the management table is a wireless communication system that is a management number assigned to the wireless communication terminal when the wireless communication base station permits the connection of the wireless communication terminal.

<Effect of (25)>
When the wireless communication base station permits the wireless communication terminal to connect, the management number assigned to the wireless communication terminal is retained in the connection management table as an identifier of the wireless communication terminal. Identification can be performed using the identifier, and management of the wireless communication terminal can be simplified.

  (26) The radio communication system according to the embodiment is the radio communication system according to (21), (21-1), (22), or (22-1), wherein the radio communication base station is the frequency channel. A queue for storing a wireless packet to be transmitted every time, and when permitting a change request from the first frequency channel to the second frequency channel of the wireless communication terminal, the wireless packet addressed to the wireless communication terminal A wireless communication system, characterized in that a first queue for a frequency channel is shifted to a second queue for a second frequency channel.

<Effect of (26)>
There is a queue for storing radio packets for each frequency channel, and in response to a frequency channel change request of a radio communication terminal, the radio packet addressed to the radio communication terminal is moved to the transmission queue of the corresponding frequency channel to The wireless packet addressed to the wireless communication terminal can be transmitted on an appropriate frequency channel with which the wireless communication terminal moving on the mobile station communicates.

  (27) The wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), wherein the wireless communication base station performs the wireless communication. When a request to change the terminal to the second frequency channel is permitted, communication between the wireless communication base station and the wireless communication terminal is started on the second frequency channel after a fixed time or more has passed since the permission. A wireless communication system.

<Effect of (27)>
Communication on the frequency channel to which the radio communication base station and the radio communication terminal have been changed by starting communication with the radio communication terminal on the frequency channel to which the radio communication terminal has been changed after a fixed time has passed since the request to change the frequency channel of the radio communication terminal. You can give grace to start preparations.

  (27-1) The wireless communication system according to the embodiment is the wireless communication system according to (27), wherein the fixed time is set to be equal to or longer than a time required for frequency channel movement by the wireless communication terminal. A wireless communication system.

<Effect of (27-1)>
Guarantee that the wireless communication terminal is ready to receive on the changed frequency channel by starting communication with the changed frequency channel after the time required for the movement of the frequency channel in the wireless communication terminal has elapsed. Thus, transmission of a wireless packet can be started.

  (27-1-1) The wireless communication system according to the embodiment is the wireless communication system according to (27-1) above, wherein the wireless communication base station changes the wireless communication terminal to a second frequency channel. The wireless communication system is characterized in that the time required for the frequency channel change from the wireless communication terminal is acquired before the permission is granted.

<Effect of (27-1-1)>
By acquiring the time required for changing the frequency channel from the wireless communication terminal before permitting the change to the second frequency channel, the time required for moving the frequency channel in the wireless communication terminal can be accurately grasped and more By starting communication with the wireless communication terminal on the change destination frequency channel, it is possible to improve the accuracy of guaranteeing that the wireless communication terminal is in a state where reception is possible on the change destination frequency channel.

  (27-2) The wireless communication system according to the embodiment is the wireless communication system according to (26), in which the wireless communication base station has permitted the wireless communication terminal to change to the second frequency channel. In this case, the wireless communication base station communicates the wireless communication base station and the wireless communication terminal on the second frequency channel after the time required for the wireless communication base station to move the wireless packet from the first queue to the second queue. Is a wireless communication system characterized by starting

<Effect of (27-2)>
By starting communication with the wireless communication terminal on the frequency channel of the change destination after the time required for movement between the queues of the wireless packets addressed to the wireless communication terminal at the wireless communication base station has elapsed, the wireless packet addressed to the wireless communication terminal is reliably It can be transmitted to the wireless communication terminal using the frequency channel to be changed.

  (27-3) The wireless communication system according to the embodiment is the wireless communication system according to (27), in which the fixed time and the wireless communication base station are allowed to change before the change to the second frequency channel is permitted. The wireless communication system is characterized by being determined by exchanging wireless packets with a wireless communication terminal.

<Effect of (27-3)>
By determining the time until the start of communication on the changed frequency channel with the wireless communication terminal by exchanging wireless packets, the wireless communication base station and the wireless communication terminal can reliably communicate on the changed frequency channel. It is possible to guarantee the start of communication after reaching a certain state.

  (28) The wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), wherein the wireless communication base station is a second wireless communication system. Whether the usage rate of the frequency channel is notified in the first frequency channel, and the radio communication terminal transmits a request for transition from the usage rate of the second frequency channel to the second frequency channel from the radio communication base station. A wireless communication system is characterized by making a determination.

<Effect of (28)>
By notifying the usage rate of another frequency channel by the wireless communication base station, it is possible to provide the wireless communication terminal with information for determining the transition to another frequency channel. By determining the transition to another frequency channel, it is possible to guarantee communication on the transition frequency channel.

  (29) A wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), wherein the wireless communication base station is a second wireless communication system. A second bandwidth that is a bandwidth of the frequency channel is notified by the first frequency channel, and the wireless communication terminal issues a request for transition from the second bandwidth to the second frequency channel from the wireless communication base station. A wireless communication system is characterized by determining whether to transmit.

<Effect of (29)>
The wireless communication base station notifies the bandwidth of another frequency channel so that the wireless communication terminal can determine whether the other frequency channel is a bandwidth that can be communicated by the wireless communication terminal. Communication can be guaranteed.

  (30) The wireless communication system according to the embodiment is the wireless communication system according to (21), (21-1), (22), or (22-1), wherein the wireless communication base station is a first wireless communication system. Security information set when communicating with the wireless communication terminal in the frequency channel is held in a connection management table in association with the identifier of the wireless communication terminal, and a change request to the second frequency channel from the wireless communication terminal In the wireless communication system, communication with the wireless communication terminal is performed on the second frequency channel using the held security information.

<Effect of (30)>
When the security information is managed together with the identifier of the wireless communication terminal in the wireless communication base station and the change request to another frequency channel is permitted, the same security information is used in the changed frequency channel. Communication can be started between the wireless communication base station and the wireless communication terminal without setting security again.

  (30-1) The wireless communication system according to the embodiment is the wireless communication system according to (30), in which the wireless communication terminal uses a first security scheme that can be used in the first and second frequency channels. The wireless communication base station notifies the wireless communication base station by a frequency channel, and the wireless communication base station associates the security method usable by the wireless communication terminal notified from the wireless communication terminal with the identifier of the wireless communication terminal in the connection management table. And when the request for change to the second frequency channel from the wireless communication terminal is made, the connection management table refers to whether the wireless communication base station is compatible with the security method requested by the second frequency channel, and permission is granted. A wireless communication system characterized by being used for determination.

<Effect of (30-1)>
The radio communication base station grasps the security methods that can be used by the radio communication terminal before requesting to change to another frequency channel, and uses it to determine whether or not to permit it when a request to change to another frequency channel is received. A connection request from a wireless communication terminal that can maintain security on another frequency channel and is known to be rejected on another frequency channel when the security method required by the wireless communication base station is not satisfied. Can be grasped in advance by the wireless communication terminal, and the occupation of the frequency channel due to the exchange of wireless packets for useless connection can be reduced. Further, when the change of the radio communication terminal to another frequency channel is permitted, the information on the security method notified from the radio communication terminal can be used for communication with the radio communication terminal on the changed frequency channel.

  (30-1-1) The wireless communication system according to the embodiment is the wireless communication system according to (30-1) above, in which the wireless communication base station transmits a second frequency channel from the wireless communication terminal to the second frequency channel. When the change request is permitted, if the first security method used in the first frequency channel can be used in the second frequency channel, the second frequency channel is used by using the stored security setting information. If the first security method is not usable in the second frequency channel, the communication management table can use the security method that can be used in the second frequency channel from the connection management table. Any one of the security methods required by the radio communication base station in the second frequency channel is set as the second security method, and the second A wireless communication system, characterized in that for setting the second security system before starting the communication using the wireless communication terminal and security systems at wave number channel.

<Effect of (30-1-1)>
If the security method before the frequency channel change can be used in the frequency channel after the change, by using the same security information for communication, the radio packet for re-setting to use the security method after the frequency channel change The exchange can be omitted, and the security method before changing the frequency channel cannot be used on the changed frequency channel, but if there is a security method supported by the wireless communication terminal in the security method required by the wireless communication base station, either By performing one setting with the wireless communication terminal on the changed frequency channel, the security required by the wireless communication base station on the changed frequency channel can be maintained.

  (30-2) A wireless communication system according to the embodiment is the wireless communication system according to (30-1), in which the wireless communication base station uses a first frequency as a security method required by a second frequency channel. A wireless communication system is characterized in that notification is made by a channel.

<Effect of (30-2)>
It is possible to change the security level required by another frequency channel by notifying the security level required by the radio communication base station in another frequency channel, and another frequency channel is supported by the radio communication terminal. It can be judged whether it is a security method.

  (31-0-1) The wireless communication base station described in (1) or (1-1), the wireless communication terminal described in (11) or (11-1), or (21) or (21- 1) In the wireless communication system according to 1), a communication method usable in the wireless communication terminal is a communication method that can be received at least by the wireless communication terminal.

<Effect of (31-0-1)>
By notifying the wireless communication base station of the communication method that can be received by the wireless communication terminal, the communication method that can be received is different from the communication method that can be transmitted. When the communication range is wide, the selection range of communication methods addressed to the wireless communication terminal from the wireless communication base station can be expanded.

  (31-0-2) The wireless communication base station described in (1) or (1-1), the wireless communication terminal described in (11) or (11-1), or (21) or (21- 1) In the wireless communication system according to 1), a communication method usable in the wireless communication terminal is a communication method that can be received and transmitted at least by the wireless communication terminal.

<Effect of (31-0-2)>
By notifying the wireless communication base station of the communication method that can be received and transmitted by the wireless communication terminal, the wireless communication base station can transmit using the communication method that can be received by the wireless communication terminal. By grasping the communication method that can be transmitted, it can be used as information when performing adaptive control, and the communication method of the wireless packet transmitted from the wireless communication terminal is narrowed down so that the reception method at the wireless communication base station Can be made easier to deal with.

  (31-0-3) The wireless communication base station described in (1) or (1-1), the wireless communication terminal described in (11) or (11-1), or (21) or (21- 1) In the wireless communication system according to 1), the usable communication method in the wireless communication terminal is a communication method that the wireless communication terminal can receive and a communication method that can be transmitted. And

<Effect of (31-0-3)>
By notifying the wireless communication base station of the communication method that can be received by the wireless communication terminal, the communication method that can be received is different from the communication method that can be transmitted. When the communication range is wide, the selection range of communication methods addressed to the wireless communication terminal from the wireless communication base station can be expanded.

  In addition, by notifying the wireless communication base station of the communication method that can be transmitted by the wireless communication terminal, the wireless base station can use the information as information when performing adaptive control of communication with the wireless communication terminal. By narrowing down the communication method of the wireless packet transmitted from the terminal, it is possible to easily support the reception method at the wireless communication base station.

  (31-1-1) The wireless communication base station described in (1) or (1-1), the wireless communication terminal described in (11) or (11-1), or (21) or (21- In the wireless communication system according to 1), the modulation and coding scheme usable in the wireless communication terminal is a modulation and coding scheme that can be received at least by the wireless communication terminal.

<Effect of (31-1-1)>
By notifying the radio communication base station of the modulation and coding scheme that can be received by the wireless communication terminal, the modulation and coding scheme that can be received differs from the modulation and coding scheme that can be transmitted. When the range is wider than the modulation and coding scheme that can be transmitted, the selection range of the modulation and coding scheme addressed to the radio communication terminal from the radio communication base station can be expanded.

  (31-1-2) The wireless communication base station described in (1) or (1-1), the wireless communication terminal described in (11) or (11-1), or (21) or (21- In the wireless communication system according to 1), the modulation and coding scheme usable in the wireless communication terminal is a modulation and coding scheme that can be received and transmitted at least by the wireless communication terminal.

<Effect of (31-1-2)>
By notifying the radio communication base station of the modulation and coding scheme that can be received and transmitted by the radio communication terminal, the radio communication base station can transmit using the modulation and coding scheme that can be received by the radio communication terminal. By grasping the modulation and coding method that can be transmitted from the communication terminal, it can be used as information when performing adaptive control, and the modulation and coding method of the wireless packet transmitted from the wireless communication terminal can be narrowed down. It is possible to facilitate the reception method at the radio communication base station.

  (31-1-3) The wireless communication base station described in (1) or (1-1), the wireless communication terminal described in (11) or (11-1), or (21) or (21- 1) In the wireless communication system according to 1), the modulation and coding scheme that can be used in the wireless communication terminal indicates a communication scheme that can be received by the wireless communication terminal and a modulation and coding scheme that can be transmitted. It is characterized by being.

<Effect of (31-1-3)>
By notifying the radio communication base station of the modulation and coding scheme that can be received by the wireless communication terminal, the modulation and coding scheme that can be received differs from the modulation and coding scheme that can be transmitted. When the range is wider than the modulation and coding scheme that can be transmitted, the selection range of the modulation and coding scheme addressed to the radio communication terminal from the radio communication base station can be expanded.

  Further, by notifying the radio communication base station of the modulation and coding scheme that can be transmitted by the radio communication terminal, the radio base station can be used as information when performing adaptive control of communication with the radio communication terminal, and By narrowing down the modulation and coding method of the wireless packet transmitted from the wireless communication terminal, it is possible to easily support the reception method at the wireless communication base station.

  (32-1) In the radio communication base station described in (8), the radio communication terminal described in (17), or the radio communication system described in (28), the usage rate of the second frequency channel is the It is an average data amount transmitted per unit time in the second frequency channel by the radio communication base station.

<Effect of (32-1)>
By providing the average amount of data that the radio communication base station transmits per unit time in another frequency channel, it is possible to provide information for determining a shift to another frequency channel to the radio communication terminal.

  (32-2 In the wireless communication base station described in (8) above, the wireless communication terminal described in (17) above, or the wireless communication system described in (28) above, the usage rate of the second frequency channel is the wireless communication The base station has a channel occupancy rate in the second frequency channel.

<Effect of (32-2)>
By providing the channel occupancy rate in another frequency channel by the radio communication base station, it is possible to provide information for determining a shift to another frequency channel to the radio communication terminal.

  (32-3 In the wireless communication base station described in (8) above, the wireless communication terminal described in (17) above, or the wireless communication system described in (28) above, the usage rate of the second frequency channel is the wireless communication It is an average time from when an access request is generated to when an access right is acquired when the base station transmits a wireless packet on the second frequency channel.

<Effect of (32-3)>
By providing the average time until the access right is acquired in another frequency channel by the radio communication base station, it is possible to provide information for determining the shift to another frequency channel to the radio communication terminal.

  (33-1) In the wireless communication base station described in (9), the wireless communication terminal described in (18), or the wireless communication system described in (29), the second bandwidth is the first frequency channel. It is characterized by being an integer multiple of 2 or more of the first bandwidth which is the bandwidth of.

<Effect of (33-1)>
By providing information that the bandwidth of another frequency channel is an integer multiple of 2 or more to the wireless communication terminal, the wireless communication terminal can easily determine whether the other frequency channel is a bandwidth that the wireless communication terminal can communicate with. In addition, it is easy to realize a bandwidth extension communication method.

  Note that the present invention is not limited to the above-described embodiment as it is, 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.

  101 ... AP; 201, 202 ... STA.

Claims (2)

A wireless communication apparatus that performs communication using at least one channel of a first channel and a second channel,
An identifier of the third channel, and the frequency band information which the third channel belongs, and a group identification information of the group Ru used in the third channel, received by the first channel,
A communication unit that communicates using the received information ;
A wireless communication apparatus capable of transitioning to communication on the second channel when the third channel matches the second channel . The channel width of the second channel in the first channel, the center frequency of the second channel, received from the other radio communication device,
A processing unit that communicates using the received information is provided.
When the channel width of the second channel is a channel width in which the device can communicate, it is possible to shift to communication on the second channel;
The channel width of the second channel is a channel width with which the other wireless communication device can communicate,
The center frequency of the second channel is a center frequency with which the other wireless communication device can communicate,
The first channel is a wireless communication device included in the second channel on the frequency axis .