Technical field
[0001]
　The present technology relates to an information processing apparatus. More particularly, to an information processing apparatus and an information processing method for exchanging information using wireless communication.
Background technique
[0002]
　Conventionally, in a radio system, when a plurality of wireless terminal performs transmission of data using the same radio resources (frequency and time), becomes an interference mutual data causing a collision, the data at the receiving side there is a case to be the failure of the reception. Therefore, when the radio terminal using the same frequency there are a plurality, such that no data collision, a mechanism in which one wireless terminal in a certain time zone it is possible to transmit the data as much as possible exclusively the frequency it is desirable to but is provided.
[0003]
　As a technique to provide such a mechanism, for example, there is a technique to avoid collision by using the carrier sense. In this technique, the wireless terminal is a reception mode before the data transmission, a frequency channel to be used for measuring the received power at (hereinafter, also referred to as channel.). Then, the wireless terminal is a measured received power is determined threshold, by suppressing the transmission until determine the free radio resources, to avoid data collisions. The threshold, in the following also referred to as carrier sense level. Thus, you can avoid a collision by suppressing the transmission or to overcome the excessive suppression of transmission reversed, is properly set carrier sense level technique is desired.
[0004]
　Therefore, for example, by temporarily changing the carrier sense level, the radio communication apparatus for performing media access efficiently has been proposed (e.g., see Patent Document 1.).
CITATION
Patent Document
[0005]
Patent Document 1: JP 2007-134905 JP
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　In the prior art described above, a wireless communication apparatus that the carrier sense level is changed, since the possibility of acquiring the transmission right of the data to the wireless communication device that is not the carrier sense level is changed increases, the transmission opportunity injustice occurs. Therefore, reducing the unfairness of the transmission opportunity, it is important to utilize the radio resources effectively.
[0007]
　This technology has been created in view of such circumstances, and an object thereof is to utilize radio resources efficiently.
Means for Solving the Problems
[0008]
　This technology has been made to solve the above problems, the first aspect has detected a packet is determined to have been transmitted from different second network from the first network to which the own apparatus belongs aborts reception of the packet if a program for executing the information processing apparatus, information processing method, and the method thereof and having a control unit which controls to handle the carrier sense as an idle state to a computer based on the reception intensity of the packet is there. Thus, in the case of detecting the packet determined to be transmitted from the second network aborts reception of the packet, an effect of handling the carrier sense as an idle state based on the reception intensity of the packet.
[0009]
　Further, in the first embodiment, the control unit may perform control to handle the idle carrier sense based on the comparison result between the reception intensity and the first threshold value of the packet. Thus, an advantage that handling the carrier sense as an idle state based on a result of comparison between the reception intensity and the first threshold value of the packet.
[0010]
　Further, in the first embodiment, the control unit on the basis of the network identifier added to the header of the physical layer in the packet, even as devices that transmitted the packet to identify the belonging the second network good. Thus, based on the network identifier added to the header of the physical layer in the packet, an effect of identifying a second network that belongs to the transmitting device the packet.
[0011]
　Further, in the first embodiment, the control unit includes a network identifier added to the header of the physical layer in the packet, based on a comparison result between the network identifier of the first network, identifying the second network it may be. Thus, the network identifier added to the header of the physical layer in the packet, based on a comparison result between the network identifier of the first network to which the own apparatus belongs, an effect of identifying the second network.
[0012]
　Further, in the first embodiment, the control unit includes a network identifier added to the header of the data link layer in the packet, based on a comparison result between the network identifier of the first network, the second network it may be identified. Thus, the network identifier added to the header of the data link layer in the packet, based on a comparison result between the network identifier of the first network to which the own apparatus belongs, an effect of identifying the second network.
[0013]
　Further, in the first embodiment, the control unit includes a radio transmission parameters in conjunction with the first information and the first information used in the determination of the first threshold value other devices belonging to the first network uses the information for specifying the set may perform control to send to the other device. Thus, an advantage that transmits information for specifying a set of the first information and the radio transmission parameters to another device.
[0014]
　Further, in the first embodiment, the control unit, said the first information, the information for specifying the first threshold value, based on a ratio of the reception intensity of the reference frame has received the reference frame above in other devices may perform control for transmitting one of the information for specifying a range for changing the first threshold value. Thus, any information for identifying a first threshold value, and information for specifying a range of changing the first threshold value in the other devices having received the reference frame based on the ratio of the reception intensity of the reference frame or an effect of sending a.
[0015]
　Further, in the first aspect, the radio transmission parameters, and transmit power, and transmit fixed latency, and maximum wait for carrier sensing, the maximum frame length, and the available channel bandwidth, available channels it may be at least one of the frequency. Thus, an effect of transmitting at least one radio transmission parameter of these.
[0016]
　Further, in this first embodiment, the control unit, when the information about the transmission power of the frame is included in the subject apparatus of the frame transmitted from another device belonging to the first network, the based on the information about the transmission power, by changing the transmission power of the acknowledgment of the frame may be performed a control to transmit the acknowledgment. Thus, if it contains information about the transmission power of the frame in subject apparatus frame transmitted from another device belonging to the first network, based on the information about the transmission power, the receipt of the frame an effect of transmitting the acknowledgment by changing the transmission power of the response.
[0017]
　Further, in the first aspect, the reference frame may be a beacon transmitted from the devices belonging to the first network. This brings about the effect of using as a reference frame a beacon transmitted from the device belonging to the first network.
[0018]
　Further, in the first embodiment, the information processing apparatus, the information for identifying a set of the first information and the radio transmission parameters, and other equipment belonging to the first network, the second network At least one may be shared among the other devices belonging to. Thus, the information for identifying a set of the first information and the radio transmission parameters, and other equipment belonging to the first network, the action of at least one share of the other devices belonging to the second network bring.
[0019]
　Further, in the first embodiment, the control unit changes the said first threshold value, to perform control to transmit the data based on the radio transmission parameters are changed in accordance with the first threshold value after the change it may be. Thus, by changing the first threshold value, an effect of transmitting the data based on the radio transmission parameters are changed in accordance with the first threshold value after the change.
[0020]
　Further, in the first embodiment, the control unit may be changed the radio transmission parameters in conjunction with the first threshold value. This provides an effect in conjunction with the first threshold value to change the radio transmission parameters.
[0021]
　Further, in the first embodiment, the control unit may perform control to change the first threshold value based on the information included in the frame transmitted from another device belonging to the first network . This brings about the effect of changing the first threshold value based on the information included in the frame transmitted from another device belonging to the first network.
[0022]
　Further, in the first embodiment, the control unit includes a margin value included in the frame may be performed a control for changing the first threshold value based on the reception strength of the frame. This provides a margin value contained in the frame, the effect of changing the first threshold value based on the reception strength of the frame.
[0023]
　Further, in the first embodiment, the control unit may perform control to change the first threshold value within a range determined based on the aforementioned margin value and the reception intensity. This brings about the effect of changing the first threshold value within a range determined based on the margin value and the reception intensity.
[0024]
　Further, in the first embodiment, the control unit, the radio based on the change amount from the reference value of the information and the first threshold value contained in the frame transmitted from another device belonging to the first network it may perform control for determining a transmission parameter. Accordingly, the information included in the frame transmitted from another device belonging to the first network, on the basis of the change amount from the reference value of the first threshold value, an effect of determining a radio transmission parameter.
[0025]
　Further, in the first aspect, the radio transmission parameters are parameters for setting the transmission power, the control unit, when changing the wireless transmission parameters, the devices belonging to the first network a frame to be transmitted, may perform control to include information about the transmission power set by the radio transmission parameters of the changed. Thus, when changing the radio transmission parameters, the frame to be transmitted to the devices belonging to the first network, an effect that include information about the transmission power set by the radio transmission parameters after the change.
[0026]
　Further, in the first aspect, the frame may be a beacon transmitted from the devices belonging to the first network. This brings about the effect of using a beacon transmitted from the device belonging to the first network.
Effect of the invention
[0027]
　According to this technique, an excellent effect of being able to utilize the radio resources effectively. Here, the advantages described in the present invention is not necessarily limited, it may be any of the effects described in the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028]
Is a diagram illustrating an example of FIG. 1 system configuration of a communication system 10 according to the first embodiment of the present technology.
FIG. 2 is a block diagram illustrating a functional configuration example of an information processing apparatus (AP) 100 according to the first embodiment of the present technology.
3 is a flowchart illustrating an example of a processing procedure of a packet transmission process by the information processing apparatus (AP) 100 according to the first embodiment of the present technology.
It illustrates FIG. 4 an example of the relationship between processing and PLCP header information processing apparatus (AP) 100 according to the first embodiment of the present technology is performed (processing classification table).
5 is a flowchart illustrating a packet detection / reception determination processing among the reception processing by the information processing apparatus (AP) 100 according to the first embodiment of the present technology.
6 is a drawing showing a relation example (processing classification table) of the information processing apparatus (AP) 100 performs processing and PLCP header in the first embodiment of the present technology.
7 is a flowchart illustrating a packet detection / reception determination processing among the reception processing by the information processing apparatus (AP) 100 according to the first embodiment of the present technology.
8 is a sequence chart showing an example of a process overall flow to be executed by each information processing apparatus constituting the communication system 10 according to the first embodiment of the present technology.
9 is a diagram showing an example of the flow of each process executed by each unit in each information processing apparatus constituting the communication system 10 according to the first embodiment of the present technology.
Diagrams [10] shows an example of a combination of Margin value and interlocking parameter calculation information stored in the storage unit 120 according to the first embodiment of the present technology.
11 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the first embodiment of the present technology.
Is a diagram illustrating an example of the extended CCA threshold determination process by the information processing apparatus (STA) 200 in the first embodiment of FIG. 12 the present technology.
The information processing apparatus (STA) 200 in the first embodiment of FIG. 13 the present technology is a diagram showing a format example of a frame to be used for transmission.
Is a diagram illustrating an example of a combination of Margin value and interlocking parameter calculation information to be shared between [14] The information processing apparatus according to the first embodiment of the present technology (AP) 100 and the information processing apparatus (STA) 200 .
Is a diagram illustrating a format example of a beacon frame exchanged between the information processing apparatus of the first embodiment of FIG. 15 the present technology.
16 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the first embodiment of the present technology.
17 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus of the second embodiment of the present technology.
18 is a sequence chart showing an example of a process overall flow to be executed by each information processing apparatus constituting the communication system 10 according to the third embodiment of the present technology.
19 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the third embodiment of the present technology.
Diagrams [20] shows an example of the format of the PPDU that are exchanged between each apparatus constituting the communication system 10 according to the fourth embodiment of the present technology.
21 is a sequence chart showing an example of setting desired detection level by the information processing apparatus (STA) 200 in the fourth embodiment of the present technology.
22 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the fourth embodiment of the present technology.
FIG. 23 is a sequence chart showing an example of a process overall flow to be executed by each information processing apparatus constituting the communication system 10 according to the fourth embodiment of the present technology.
FIG. 24 is a sequence chart showing an example of a process overall flow to be executed by each information processing apparatus constituting the communication system 10 according to the fifth embodiment of the present technology.
Is a diagram illustrating a format example of a beacon frame exchanged between the information processing apparatus according to the fifth embodiment of FIG. 25 the present technology.
[FIG. 26] is a diagram showing an example of an information processing apparatus according to the fifth embodiment of the present technology (STA) 200 transmission power determination process by (TPC transmission power determination process).
FIG. 27 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to a sixth embodiment of the present technology.
[FIG. 28] is a diagram showing an example of a format of a frame exchanged between each apparatus constituting the communication system 10 according to the seventh embodiment of the present technology.
[29] The information processing apparatus according to a seventh embodiment of the present technology (AP) 100 performs processing and PLCP header is a diagram showing an example of the relationship between MAC header (processing classification table).
FIG 30 is a flowchart illustrating a packet detection / reception determination processing among the reception processing by the information processing apparatus (AP) 100 according to a seventh embodiment of the present technology.
[FIG. 31] is a seventh diagram schematically showing an example of a virtual subtraction backoff counter by the information processing apparatus (AP) 100 in the embodiment of the present technology.
[FIG. 32] is a block diagram showing an example of a schematic configuration of a smart phone.
[FIG 33 is a block diagram showing an example of a schematic configuration of a car navigation system.
FIG. 34 is a block diagram showing an example of a schematic configuration of a wireless access point.
DESCRIPTION OF THE INVENTION
[0029]
　Hereinafter, embodiments of the present technology (hereinafter, referred to as embodiments) will be described. Description will be made in the following order.
　1. First Embodiment (STA (Station) is an example of determining the extended CCA (Clear Channel Assessment) threshold based on the notified margin value from AP (Access
　Point)) 2. Second Embodiment (upper limit level of the extended CCA threshold, an example of setting the lower limit level, etc. of the transmission power)
　3. Third Embodiment (the STA, an example of using the extended CCA threshold notified from the
　AP) 4. (Example notifies the communication hope detection level partner) fourth embodiment
　5. Fifth Embodiment (example of setting the extended CCA threshold assumes execution of transmission power control in the STA)
　6. (Examples of adding processing of suppressing lowering excessive transmission power depending on the situation as a rule) Sixth Embodiment
　7. 7 (example of combined use of extended CCA operation with an extended CCA operation and the MAC header to use the PLCP
　header) 8. Application Example
[0030]
　<1. First Embodiment>
　[Configuration Example of Communication System]
　FIG. 1 is a diagram illustrating an example of a system configuration of a communication system 10 according to the first embodiment of the present technology.
[0031]
　Communication system 10 includes an information processing apparatus (AP) 100, an information processing apparatus (STA) 200, and an information processing apparatus (STA) 250. Communication system 10 can, for example, wireless LAN (Local Area Network), or a system in accordance with the communication scheme pursuant to a wireless LAN.
[0032]
　The information processing apparatus (AP) 100 is a wireless communication device corresponding to the master unit that is central to the communication system 10 (master station, a base station). The information processing apparatus (AP) 100 may be connected with an external network and a wired or wireless such as the Internet. For example, the information processing apparatus (AP) 100 may be an access point in a wireless LAN system.
[0033]
　The information processing apparatus (STA) 200 and an information processing apparatus (STA) 250 are each a wireless communication device corresponding to the information processing apparatus (AP) 100 wirelessly connected to the slave unit communicate (slave station). Further, in FIG. 1 schematically shows a wireless connection between the devices by a dotted line. For example, the information processing apparatus (STA) 200 and an information processing apparatus (STA) 250 may be a station in the wireless LAN system.
[0034]
　The information processing apparatus (STA) 200 is provided with at least one of functions of changing the extended CCA function or transmit power (TPC (Transmit Power Control) function).
[0035]
　Here, extended CCA function, the detected packet, when it is determined that the packets sent from the wireless network different self apparatus belongs, the process returns to the standby state discontinued the reception operation in the middle, that (in the following, it referred to as extended CCA threshold.) reception intensity and the determination threshold of the packet when the relationship between the predetermined condition is satisfied, even during the signal duration of the packet, the operation to deal with the channel state as idle It refers to the function.
[0036]
　When the information processing apparatus (STA) 200 has an extended CCA function is capable both of the transmission of using an extended CCA, the normal transmission without using an extended CCA is. The information processing apparatus (STA) 200, if not using the extended CCA, regardless of the wireless network transmission source device of the detected packet belongs, is in the signal duration of the packet, Ya loss of unanticipated inputs with the exception of an error such as the PHY (Physical Layer) header, treat the channel state as busy.
[0037]
　Further, for example, in the case where the information processing apparatus (STA) 200 has a TPC function, a transmission using the TPC, is capable of both the normal transmission without using a TPC.
[0038]
　The information processing apparatus (STA) 250 has no extension CCA function. That is, the information processing apparatus (STA) 250, based on the condition of the wireless network transmission source device of the detected packet belongs and the received strength, the ability to handle the channel state during the signal duration of the packet as an idle not provided. Therefore, the information processing apparatus (STA) 250, regardless of the wireless network transmission source device of the detected packet belongs, is in the signal duration of the packet exceptions described above, treat the channel state as busy. Hereinafter, an information processing apparatus (STA) 200, also referred to as HE (High Efficiency) device, an information processing apparatus (STA) 250, also referred to as legacy devices. Also, unless otherwise identified HE devices and legacy devices, it simply collectively referred to as information processing apparatus (STA).
[0039]
　The information processing apparatus (STA) 200 may dynamically change the extended CCA threshold described above. Thus, the information processing apparatus (STA) 200, within the range set by law, it is possible to dynamically change the extended CCA threshold.
[0040]
　Further, the operation mode when not using the extended CCA in the information processing apparatus (STA) 200, also referred to as the normal mode, the operation mode when dynamically changing the extended CCA threshold using an extended CCA, extended CCA mode and also referred to. The information processing apparatus (STA) 200 is a parameter used for data transmission, also referred to as transmission parameters. The transmission parameters, e.g., transmission power, EDCA (Enhanced Distributed Channel Access) parameter, slot parameters, the maximum frame length, bandwidth, and parameters such as operating channel. Further, the transmission parameters in the normal mode, also referred to as default transmission parameters, the transmission parameters in the extended CCA mode, also referred to as linked parameters. Note that the legacy device is intended to use a default threshold and default transmission parameters. The default threshold and default transmission parameter may be the same for each device may be different.
[0041]
　[Configuration Example of Information Processing Apparatus]
　FIG. 2 is a block diagram illustrating a functional configuration example of an information processing apparatus (AP) 100 according to the first embodiment of the present technology. Since the functional configuration of the information processing apparatus (STA) 200, is substantially the same as the information processing apparatus (AP) 100, the description thereof is omitted.
[0042]
　The information processing apparatus (AP) 100 includes a communication unit 110, an antenna 111, a storage unit 120, a control unit 130.
[0043]
　The communication unit 110 performs transmission and reception of packets through the antenna 111. For example, the signal processing general data link and physical layer related to transmission and reception of data is included in the communication unit 110.
[0044]
　Here, the data link layer processing, specifically, the additional data LLC (Logical Link Control) the payload / SNAP (Subnetwork Access Protocol) header from the upper layer, removal, MAC of (Media Access Control) header addition / removal, including the detection of additional / packet error of the error detection code, retransmission, media access process by CSMA / CA (Carrier Sense Multiple access / Collision Avoidance), the production or the like of the management frame and the control frame.
[0045]
　The physical layer processing is specifically based on the coding and modulation scheme is set by the control unit 130, encoding, interleaving, processing of modulation and, PLCP addition of (Physical Layer Convergence Protocol) header and PLCP preamble , including detection and channel estimation process according to the preamble, the analog / digital signal conversion, frequency conversion, amplification, filtering and the like.
[0046]
　Storage unit 120 is for recording and reproducing data with respect to a predetermined recording medium. For example, the storage unit 120 is realized by various types of recording medium. For example, HDD (Hard Disc Drive), may be used a solid-state memory such as a flash memory, built-in memory card fixed memory, an optical disk, a magneto-optical disk, a recording medium such as a hologram memory.
[0047]
　Control unit 130 functions as an arithmetic processing device and a control device, which controls the overall operation of the information processing apparatus (AP) 100 according to various programs. For example, the control unit 130, CPU (Central Processing Unit), is realized by an electronic circuit such as a microprocessor. The control unit 130, ROM (Read Only Memory) for storing programs used and operation parameters, and may be a RAM (Random Access Memory) for temporarily storing the parameters that appropriately change.
[0048]
　For example, the control unit 130 performs setting of various parameters used in the communication unit 110. The control unit 130, the information processing apparatus (AP) 100 to the connected rules to be reported to the information processing apparatus (STA) (rules for changing the expansion CCA threshold used in the network (for expansion CCA margin value and interlocking parameter calculation information)) to generate a.
[0049]
　Further, for example, the control unit 130, when detecting a packet is determined to have been transmitted from different second network from the first network information processing apparatus (AP) 100 belongs, performs control to abort the reception of the packet . In this case, the control unit 130, based on the reception intensity of the packet, and controls to handle the carrier sense as an idle state. Specifically, the control unit 130 compares the reception intensity of the packet, and a first threshold value (extended CCA threshold), based on the comparison result, performs a control to handle the carrier sense as an idle state.
[0050]
　For example, the control unit 130, the physical layer in the received packet (e.g., PLCP layer) network identifier added to the header (for example, called COLOR information and BSS COLOR information) based on, is equipment that sent the packet it can be identified belongs network. Specifically, the control unit 130 includes a network identifier added to the header of the physical layer in the packet, based on the comparison result of the network identifier of the network to which the own device belongs, the network device which has transmitted the packet belongs it can be identified.
[0051]
　Further, for example, the control unit 130 changes the first threshold value (extended CCA threshold), based on the radio transmission parameters are changed in accordance with the first threshold value after the change, it performs control to transmit the data. In this case, the control unit 130 can change the radio transmission parameters in conjunction with the first threshold value.
[0052]
　[Operation Example of carrier sense and expansion CCA]
　here, the operation example of a typical carrier sense and expansion CCA will be described.
[0053]
　Figure 3 is a flow chart illustrating an example of a processing procedure of a packet transmission process by the information processing apparatus (AP) 100 according to the first embodiment of the present technology. In FIG. 3, but illustrating the information processing apparatus (AP) 100, can be similarly applied to other information processing apparatus (information processing apparatus (STA) 200). That is, the transmission and reception process, the master station side daughter also becomes equivalent processing.
[0054]
　Control unit 130 of the information processing apparatus (AP) 100 is transmitting, except during receive time, a packet detection / reception determination processing (step S810). This packet detection / reception determination process will be described in detail with reference to FIG.
[0055]
　Subsequently, the control unit 130 of the information processing apparatus (AP) 100 determines whether the packet to be transmitted exists (step S801). If the packet to be transmitted does not exist terminates (step S801), the operation of the packet transmission and reception processing.
[0056]
　If the packet to be transmitted is present (step S801), the control unit 130 of the information processing apparatus (AP) 100 determines whether the information processing apparatus (AP) 100 has acquired the transmission right (step S802).
[0057]
　Here, the state has won the right to transmit, for example, is intended to mean a state in which the back-off counter carrier sense result is decremented in response to a time in the IDLE is zero.
[0058]
　If the information processing apparatus (AP) 100 has acquired the transmission right (step S802), the control unit 130 of the information processing apparatus (AP) 100 performs packet transmission (Step S804). When the information processing apparatus (AP) 100 is not acquired the transmission right (step S802), the control unit 130 of the information processing apparatus (AP) 100 is the packet to be transmitted immediately for received from the communication counterpart packet it is determined whether the response (step S803).
[0059]
　The packet to be immediate response to receiving from the communication counterpart packet, for example, a CTS (Clear to Send)) frames, ACK (ACKnowledge) frame, Block Ack frame.
[0060]
　Packet to be transmitted, if not immediate response to receiving from the communication partner packet (step S803), without transmission of the packet, terminates the operation of the packet transmission and reception processing. Packet to be transmitted, if an immediate response to the received from the communication counterpart packet (step S803), the control unit 130 of the information processing apparatus (AP) 100 performs packet transmission (Step S804). Thus, the transmission of the packet is an immediate response to the received from the communication partner packets can be performed regardless of the state of carrier sensing.
[0061]
　Thus, the information processing apparatus (AP) 100, there is a packet to be transmitted, and, if they were acquired transmission right, when the packet to be transmitted is an immediate response to the packet from the communication partner , and transmits the packet.
[0062]
　[Operation example of the packet detection / reception determination processing]
　FIG. 4 is a diagram showing an example of the relationship between processing and PLCP header information processing apparatus (AP) 100 according to the first embodiment of the present technology is performed (processing classification table) it is. Note that the FIG. 4, with reference to FIG. 5 will be described in detail.
[0063]
　Figure 5 is a flowchart illustrating a packet detection / reception determination processing among the reception processing by the information processing apparatus (AP) 100 according to the first embodiment of the present technology (processing procedure in step S810 shown in FIG. 3).
[0064]
　First, the control unit 130 of the information processing apparatus (AP) 100 is held against the signals input via the antenna 111, performs the measurement of the RSSI (Received signal strength indication), the RSSI obtained by the measurement (step S811). The control unit 130 of the information processing apparatus (AP) 100 performs a correlation calculation of the Preamble pattern, obtains a correlation output (step S811). The correlator output means the correlation output intensity COL (Correlator Output Level). Here, the relationship between RSSI and correlation output intensity COL can be simplified manner shown by the following equation.
[0065]
　　Correlation output intensity COL = RSSI × normalized correlator output
[0066]
　That is, the correlator output is not a normalized correlator output level, a correlator output which is converted to reflect the received power.
[0067]
　Thus, each of the information processing apparatus (AP, STA), monitors while, on the signal inputted through the antenna, the measurement and Preamble correlator output of the RSSI being in a standby state (step S811) .
[0068]
　Subsequently, the control unit 130 of the information processing apparatus (AP) 100 performs a correlation calculation of the Preamble pattern is compared with the detection threshold and the output (Preamble correlator output) (step S812). Here, the detection threshold is detected threshold for reading SIGNAL field prior to the present determination process.
[0069]
　If the value of Preamble correlator output is below the detection threshold (step S812), the control unit 130 of the information processing apparatus (AP) 100 compares the measured RSSI and energy detection thresholds ED (Step S813) . Then, the control unit 130 of the information processing apparatus (AP) 100 determines whether the RSSI exceeds the energy detection threshold value ED (step S813). Here, the energy detection threshold ED may be, for example, to -62dBm per 20MHz bandwidth.
[0070]
　If the RSSI exceeds the energy detection threshold value ED (step S813), the control unit 130 of the information processing apparatus (AP) 100 maintains a carrier sense BUSY state (step S814), the packet detection / reception determination to terminate the operation of the processing. On the other hand, if the RSSI is below the energy detection threshold value ED (step S813), the control unit 130 of the information processing apparatus (AP) 100 is to transition to a carrier sense IDLE state (step S815), the packet detection / reception to terminate the operation of the determination process.
[0071]
　Further, when the value of Preamble correlator output exceeds the detection threshold (step S812), the control unit 130 of the information processing apparatus (AP) 100 transitions to a carrier sense BUSY state (step S 816). Subsequently, the control unit 130 of the information processing apparatus (AP) 100 decodes the subsequent SIGNAL field in the PLCP header, reads the information and the like within the SIGNAL field (step S817).
[0072]
　For example, shown in FIG. 20, "COLOR" field, reads each of the PLCP Header CRC (Cyclic Redundancy Check (Cyclic Redundancy Check)). The "COLOR" field, COLOR information is a wireless network identifier is stored.
[0073]
　Here, COLOR information (BSS COLOR information), partner device connected (e.g., master station) and information broadcast in advance from, identifies the BSS (Basic Service Set) which own device belongs it is information that can (e.g., numeric). That, COLOR information (BSS COLOR information) is an example of an identifier for identifying a network. Further, COLOR information (BSS COLOR information) is an example of an identifier for identifying a BSS in PLCP layer. As similar information, in the MAC header, BSSID is stored. However, COLOR information can form a further simplified than BSSID, expressed in the physical layer (PLCP layer).
[0074]
　The control unit 130 of the information processing apparatus (AP) 100 includes a respective information read collates the processing classification table shown in FIG. 4, to determine the subsequent processing (step S817).
[0075]
　Specifically, the control unit 130 of the information processing apparatus (AP) 100 calculates the CRC of the PLCP header, to check for errors in the PLCP header. Here, when there is an error in the PLCP header can not confirm the validity of field values. Therefore, as shown in FIG. 4, when there is an error in the PLCP header, the subsequent processing for determining the "receiving censored (ERROR)". If there is no error in the CRC of the PLCP header, based on the contents of the "COLOR" field to determine the process.
[0076]
　Specifically, there is COLOR fields, and the value of the COLOR field, if the own apparatus is the same as the value of the BSS belonging determines that "receive" the subsequent processes. Further, there is COLOR fields, and the value of the COLOR field is different from the ones of the BSS device itself belongs, to determine the subsequent processing and "receiving censored". In addition, if the COLOR field does not exist, to determine the subsequent processing and "receive".
[0077]
　If, it is assumed that no function of the information processing apparatus (AP) 100 interprets the COLOR information. In this case, when there is no error in the CRC calculation result of the PLCP header, whether COLOR information, regardless of the value of COLOR information, the subsequent process to "receive".
[0078]
　Thus, the control unit 130 of the information processing apparatus (AP) 100, as the subsequent processing, "receiving", "receive abort", to determine one of "reception discontinuation (ERROR)" (step S817).
[0079]
　If the "receive" is determined as the subsequent processing (step S818), the control unit 130 of the information processing apparatus (AP) 100, it continues to receive the detected packet to the end (step S819).
[0080]
　If the "receive abort" is determined as the subsequent processing (step S818), the control unit 130 of the information processing apparatus (AP) 100 may abort the reception of the detected packets PLCP header end, returns to the standby mode (step S820). However, the carrier sense state is treated as a BUSY until the end time of the packet (step S821). Also, the previous frame interval next transmission attempt (IFS (Inter Frame Space)), AIFS (Arbitration IFS), or, and DIFS (Distributedaccess IFS).
[0081]
　Further, if the "receive abort (ERROR)" is determined as the subsequent processing (step S818), the control unit 130 of the information processing apparatus (AP) 100 may abort the reception of the detected packet in PLCP header end , it returns to the standby state (step S822).
[0082]
　Here, in the embodiment of the present technology, an example when using the extended CCA functions described above. That is, the BSS identifier (COLOR information), using an extended CCA threshold (determination threshold), abort reception of a packet that is determined to not have been sent from the BSS to the self apparatus belongs, the channel is by further condition It shows an example in which the operation of handling the empty state. In this operation the embodiment of the present technology forms, referred to as extended CCA operation. Further, the method for obtaining extended CCA threshold used for this operation is considered a plurality of variations.
[0083]
　Incidentally, expansion CCA threshold, especially as the default value of If omitted, it is assumed that a value of the common carrier sense operation equivalent mentioned above. That, and performs equivalently same operation as FIG. 5 as being less preamble detection threshold.
[0084]
　Extended CCA operation example of the packet detection / reception determination processing in operation]
　FIG. 6 is a example of the relationship between the process and the PLCP header information processing apparatus (AP) 100 according to the first embodiment of the present technology is performed (processing classification it is a diagram showing a table). Note that FIG. 6, with reference to FIG. 7 will be described in detail.
[0085]
　Figure 7 is a flowchart illustrating a packet detection / reception determination processing among the reception processing by the information processing apparatus (AP) 100 according to the first embodiment of the present technology (processing procedure in step S810 shown in FIG. 3). Incidentally, FIG. 7, because it is obtained by changing a part of FIG. 5, the parts common to FIG. 5, the same reference numerals, the description thereof is omitted.
[0086]
　Control unit 130 of the information processing apparatus (AP) 100 decodes the subsequent SIGNAL field in the PLCP header, reads the information and the like within the SIGNAL field (step S817).
[0087]
　The control unit 130 of the information processing apparatus (AP) 100 includes a respective information read collates the processing classification table shown in FIG. 6, to determine the subsequent processing (step S825).
[0088]
　Specifically, the control unit 130 of the information processing apparatus (AP) 100 calculates the CRC of the PLCP header, to check for errors in the PLCP header. Here, when there is an error in the PLCP header can not confirm the validity of field values. Therefore, as shown in FIG. 6, if there is an error in the PLCP header, the subsequent processing for determining the "receiving censored (ERROR)". If there is no error in the CRC of the PLCP header, based on the contents of the extended CCA threshold and "COLOR" field to determine the process.
[0089]
　Here, in particular, when it is assumed that the information for identifying the extended CCA threshold is included in the packet itself (i.e., if it is assumed the format shown in Figure 20 as PPDU format of a packet incoming) is , it uses a value specified from the contents of the "Requested Detection Level" field that is described in the incoming packet itself as an extended CCA threshold. When it is assumed that the information for identifying the extended CCA threshold is not included in the packet itself, it extended CCA threshold is derived in advance in a different way, using the value held.
[0090]
　Specifically, there is COLOR fields, and the value of the COLOR field, if the own apparatus is the same as the value of the BSS belonging determines that "receive" the subsequent processes. In addition, if the COLOR field does not exist, to determine the subsequent processing and "receive".
[0091]
　Further, there is COLOR fields, and the value of the COLOR field is different from the ones of the BSS device itself belongs, to determine the subsequent processing and "receiving censored". In this case, the correlator output intensity (value of Preamble correlator output) is either less than extended CCA threshold, determines the whether or higher. When the correlator output intensity is lower than the expansion CCA threshold, the subsequent processing for determining the "receiving censored (IDLE)". On the other hand, the correlator output intensity when it is more extended CCA threshold, the subsequent processing for determining the "receiving censored (BUSY)". The value to be compared with the extended CCA threshold, RSSI, etc., may be another indicator of the strength of the received signal.
[0092]
　Thus, the control unit 130 of the information processing apparatus (AP) 100, as the subsequent processing, "receiving", "receive abort (IDLE)", "receive abort (BUSY)", the "receive abort (ERROR)" determining either (step S817).
[0093]
　Further, if the "receive abort (IDLE)" is determined as the subsequent processing (step S825), the control unit 130 of the information processing apparatus (AP) 100 may abort the reception of the detected packet in PLCP header end , it returns to the standby state (step S822). In this case, the control unit 130 of the information processing apparatus (AP) 100 handles the carrier sense as an idle state (step S822).
[0094]
　[Overall Processing Example]
　FIG. 8 is a sequence chart showing an example of a process overall flow to be executed by each information processing apparatus constituting the communication system 10 according to the first embodiment of the present technology. 8, as each information processing apparatus constituting the communication system 10, showing the flow of overall processing an information processing apparatus (AP) 100 and the information processing apparatus (STA) 200.
[0095]
　First, the information processing apparatus (AP) 100 performs a margin value determination processing for the extended CCA (step S711). Subsequently, the information processing apparatus (AP) 100 performs interlocking parameter information determining process (step S712). Subsequently, the information processing apparatus (AP) 100 performs notification processing to the information processing apparatus (STA) 200 (step S713).
[0096]
　Subsequently, the information processing apparatus (STA) 200 performs an extended CCA threshold value determination processing (step S714). Subsequently, the information processing apparatus (STA) 200 performs interlocking parameter setting processing (step S715).
[0097]
　Example of the Processing Flow
　FIG. 9 is a diagram showing an example of the flow of each process executed by each unit in each information processing apparatus constituting the communication system 10 according to the first embodiment of the present technology. In Figure 9, as each section of each information processing apparatus constituting the communication system 10, a communication unit 110 and the control unit 130 of the information processing apparatus (AP) 100, the information processing apparatus (STA) communicating section at 200 210 and controller 230 showing the flow of the processing on the door. The communication unit 210 and the control unit 230 corresponds to the communication unit 110 and the control unit 130 shown in FIG.
[0098]
　First, the control unit 130 of the information processing apparatus (AP) 100 determines the margin value for use in determining the extended CCA threshold (margin value for extended CCA), it derives the interlocking parameter calculation information (301). The control unit 130 of the information processing apparatus (AP) 100 generates the content of the beacon (301). Then, the control unit 130 of the information processing apparatus (AP) 100 outputs the contents to the communication unit 110 (302).
[0099]
　The information processing apparatus (AP) 100 communication section 110 of, based on the control of the control unit 130 transmits a beacon including a margin value for the extended CCA in the information processing apparatus (STA) 200 (303). The information processing apparatus (STA) 200 communication section 210 of the outputs the contents of the received beacon to the control unit 230 (304).
[0100]
　Subsequently, the control unit 230 of the information processing apparatus (STA) 200 is a receiving strength of the received beacon, on the basis of the margin value for the extended CCA included in the received beacon, changes the extended CCA threshold (305). The control unit 230 of the information processing apparatus (STA) 200, based on the correction amount of expansion CCA threshold, set the interlock parameter (305). Then, the control unit 230 of the information processing apparatus (STA) 200 outputs the contents to the communication unit 210 (306). The information processing apparatus (STA) 200 communication section 210 of, based on settings from the control unit 230 performs transmission processing.
[0101]
　The control unit 230 of the information processing apparatus (STA) 200, when setting the transmission power as interlocking parameter and instructs to include the interlocking parameters (transmission power information) to the part of the transmission data to the communication unit 210 ( 307, 308).
[0102]
　The communication unit 210 of the information processing apparatus (STA) 200, under the control of the control unit 230, transmits the data to the information processing apparatus (AP) 100 (309). The information processing apparatus (AP) 100 communication unit 110 of the outputs the contents of the received data to the control unit 130 (310).
[0103]
　Control unit 130 of the information processing apparatus (AP) 100, if included transmission power information in the received data, ACK based on the content, and controls the transmission power of the ACK for the received data to the communication unit 110 It is allowed to transmit (311, 312). The information processing apparatus (AP) 100 communication section 110 of, based on the control of the control unit 130 transmits an ACK (313).
[0104]
　Thus, the control unit 230 of the information processing apparatus (STA) 200, when changing the radio transmission parameters related to transmission power, a frame to be transmitted to the devices belonging to the same network, the information about the transmission power after the change the control to include done.
[0105]
　Further, assume a case that contains information about the transmission power of the frame in subject apparatus frame transmitted from another device belonging to the same network. In this case, the control unit 130 of the information processing apparatus (AP) 100, based on information about the transmission power, by changing the transmission power of the acknowledgment (ACK) of the frame control to transmit the acknowledgment do.
[0106]
　Next, a description will be given of each process.
[0107]
　Extended CCA for margin value determination processing (step S711 shown in FIG. 8)]
　The information processing apparatus (AP) 100 control unit 130 as one of the adjustment rules, the subordinate apparatus in the connection (STA) is extended CCA threshold determining the margin value (margin value for extended CCA) used in determining the. In the first embodiment of the present technology, it deals with threshold information processing apparatus (STA) 200 is determined as an extended CCA threshold. In the following, there is a case where the extended CCA threshold, referred to as EXTCCA_TH.
[0108]
　Control unit 130 of the information processing apparatus (AP) 100 may determine the margin value in a variety of criteria. For example, the control unit 130 of the information processing apparatus (AP) 100 may measure the average intensity of the interference by monitoring the ambient, to determine the margin value based on the average intensity of the measured interference. For example, the control unit 130 of the information processing apparatus (AP) 100, if the average intensity of the interference determines the larger value is higher based on the threshold value as a margin value, the average intensity of the interference is low a threshold as a reference it is possible to determine a smaller value as the margin value.
[0109]
　Further, for example, the control unit 130 of the information processing apparatus (AP) 100 may determine the margin value in accordance with the respective number of the HE devices and legacy devices (or percentage). Here, the legacy device is a particular function (e.g., the ability to perform an extended CCA operation) the information processing apparatus without a. For example, the control unit 130 of the information processing apparatus (AP) 100, of the subordinate apparatus (STA), considering the number of HE apparatus having a function of executing an extended CCA operation, and the number of the legacy devices not equipped with the function , it is possible to determine the margin value.
[0110]
　Further, for example, the control unit 130 of the information processing apparatus (AP) 100 can be determined the margin value in consideration of the information of the number of HE devices and legacy devices belonging to another of BSS (Basic Service Set) good.
[0111]
　Further, for example, the control unit 130 of the information processing apparatus (AP) 100 is based on a combination of the number of the information processing apparatus, and the average intensity of the interference may be determined margin value. The information processing apparatus (AP) 100 is a predetermined value (for example, a fixed value) may be adopted as the margin value.
[0112]
　[Interlocking parameter information determining process (step S712 shown in FIG. 8)]
　The information processing apparatus (AP) 100 control unit 130 as one of the adjustment rules, the subordinate apparatus in the connection (STA) determines the transmission parameter determining interlocking parameter calculation information used. That is, the control unit 130 of the information processing apparatus (AP) 100 changes the transmission parameter from the default.
[0113]
　Interlocking parameters, the subordinate apparatus (STA), the increase or decrease of the transmission opportunity by the extended CCA, a value that affect opposite, is a parameter for changing the transmission parameters.
[0114]
　In other words, interlocking parameters, if the information processing apparatus (STA) 200 changes the extended CCA threshold EXTCCA_TH, an incidental parameters imposed in order to mitigate the unfair system as a whole. Interlocking parameters, if raising the expansion CCA threshold EXTCCA_TH may implications penalty imposed in exchange for an increase in the transmission opportunity. On the other hand, when lowering the extended CCA threshold EXTCCA_TH are implications as incentives to provide in exchange for reduction of transmission opportunity.
[0115]
　This interlocking parameters, transmission parameters that have been changed from the default transmission parameter in conjunction with the change of the extended CCA threshold EXTCCA_TH is set.
[0116]
　Interlocking parameter calculation information may be, for example, correspond to a margin value one-to-one described above. In other words, interlocking parameter calculation information to the margin value can be made to correspond uniquely. In this case, the information processing apparatus (AP) 100, in conjunction parameter calculation information if the margin value is the same is guaranteed to be the same. Also, the combination of the interlocking parameter calculation information and the margin value may be common with the other information processing apparatus (AP). In this case, even in a different information processing apparatus (AP), it is ensured that the margin value is also the same interlocking parameter calculation information if identical.
[0117]
　For example, the control unit 130 of the information processing apparatus (AP) 100 may store the combination of the margin values ​​and interlocking parameter calculation information in the storage unit 120, from among the combinations, it is possible to select a combination to be used. It shows this combination example in FIG.
[0118]
　The selection criteria combinations, it is possible to use the same standards and criteria for determining the margin value. The control unit 130 of the information processing apparatus (AP) 100, using the calculation formula for associating the interlocking parameter calculation information and margin value to one-to-one, may be derived the interlocking parameter calculation information .
[0119]
　Here, transmission parameters are changed by the interlocking parameter calculation information is variously considered. For example, interlocking parameter calculation information as a parameter for changing the transmission power, it may include a transmit power changing coefficient α and beta. This makes it possible to change the transmission power in conjunction with the change of the extended CCA threshold EXTCCA_TH.
[0120]
　Further, interlocking parameter calculation information as a parameter for changing the transmission fixed latency, fixed latency change coefficient for transmission gamma, kappa, may include a tau. This makes it possible to change the transmission fixed waiting time in conjunction with the change of the extended CCA threshold EXTCCA_TH.
[0121]
　Further, interlocking parameter calculation information as a parameter for changing the random carrier sensing latency, maximum wait change factor for carrier sense [delta], may include a epsilon. Thus, it is possible to change the random wait time carrier sense in conjunction with the change of the extended CCA threshold EXTCCA_TH.
[0122]
　Further, interlocking parameter calculation information, radio resources (e.g., frequency) as a parameter for changing the occupation time length of the maximum frame length change coefficient mu, may include a [nu. This makes it possible to change the exclusive time length of the radio resources in conjunction with the change of the extended CCA threshold EXTCCA_TH.
[0123]
　For the same purpose, the maximum transmission information amount in one time of frame transmission, maximum packet connection number at a time of transmission, the maximum number of retransmissions of the same packet, the maximum time length that can be used for continuous transmission of a plurality of frames (e.g., TXOP limit) the parameters for changing, may be included in conjunction parameter calculation information.
[0124]
　Further, interlocking parameter calculation information as a parameter for changing the available channel bandwidth, it may include the available channel bandwidth change factor lambda. This makes it possible to change the available channel bandwidth in association with the change of the extended CCA threshold EXTCCA_TH.
[0125]
　Further, interlocking parameter calculation information as a parameter for limiting the channel frequency available, the channel limiting operation determination coefficient omega, or may include at least one of information designating a group of available channels. This makes it possible to limit the channel frequency that can be used in conjunction with the change of the extended CCA threshold EXTCCA_TH.
[0126]
　Combination examples of margin values and interlocking parameter calculation information]
　FIG. 10 is a diagram showing an example of a combination of Margin value and interlocking parameter calculation information stored in the storage unit 120 according to the first embodiment of the present technology is there.
[0127]
　In Figure 10, the transmission power and transmission fixed wait time (e.g., AIFSN (Arbitration Inter Frame Space number)) shows an example of a case where the transmission parameter to be changed. The information processing apparatus (AP) 100 may select one of these combinations of entries (rows). As in the amount of change (scale of penalties or incentives) increases, the information processing apparatus (AP) 100 (or, the information processing apparatus of the notification destination (STA) 200) under the control of, interlocking parameter calculation information it is also possible to change the value.
[0128]
　[Notification processing (Step S713 shown in FIG. 8)]
　The information processing apparatus (AP) 100 control unit 130 of notifies the generated information indicating a change rule to the information processing apparatus (STA) 200. In the first embodiment of the present technology, the information processing apparatus (AP) 100, an example of notifying stores a margin value and interlocking parameter calculation information for extended CCA threshold calculated in the frame. Frame to store each of them information, for example, may be a beacon frame to be notified to the whole subordinate apparatus (STA), may be other management frames be individually notified. Here, as an example, it shows a format example of a case of storing their respective information in the beacon frame.
[0129]
　[Format example of a beacon]
　FIG 11 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the first embodiment of the present technology.
[0130]
　The payload 401 in a beacon frame shown in FIG. 11, Dynamic CCA Parameters402 is arranged. The Dynamic CCA Parameters402, information indicating a change rule is stored.
[0131]
　Specifically, Dynamic CCA Parameters402 includes Element ID 403, and Length404, the CCA Margin405, composed of a Linked Parameter List406.
[0132]
　The Element ID 403, the identification information is stored. The Length404, field length are stored.
[0133]
　The CCA Margin405 is above extended CCA for margin value determination processing (margin value for extended CCA threshold calculation) determined margin value (step S711 of FIG. 8) is stored.
[0134]
　The Linked Parameter List406, interlocking parameter calculation information determined by the above-mentioned interlocked parameter information determining process (step S712 of FIG. 8) is stored.
[0135]
　Linked Parameter List406 is, the Num of Entries407, and Parameter Type408,410, constituted by the Coefficient Values409,411. Further, the Parameter Type408,410, the Coefficient Values409,411, composed of the N pairs. Here, N is a value indicating the number of interlocking parameter calculation information to be changed.
[0136]
　The Num of Entries407, the number of interlocking parameter calculation information to be changed is stored. The Parameter Type408,410, type of interlocking parameters to be changed are stored. The Coefficient Values409,411, change the coefficient values ​​(interlocking parameter calculation information) is stored.
[0137]
　Thus, by notifying stores a margin value and interlocking parameter calculation information to the beacon frame, the rules are complied of "one-to-one correspondence with the margin value and the interlocking parameter calculation information" above . Further, by notifying stores a margin value and interlocking parameter calculation information to the beacon frame, even if the information processing apparatus (AP) 100 has an incorrect setting such that damage the quality of the system, the information processing apparatus ( STA) 200, or other devices can detect the fraud. Thus, it is possible to ensure testability.
[0138]
　Thus, the combination of the margin values ​​and interlocking parameter calculation information (i.e., changed rule) information indicating is notified from the information processing apparatus (AP) 100 to the information processing apparatus (STA) 200.
[0139]
　Thus, in the first embodiment of the present technology, as shown in FIG. 11 shows an example of notifying the information processing apparatus (STA) to store the margin values ​​and interlocking parameter calculation information itself in the beacon frame . However, information for specifying at least one of the margin value and interlocking parameter calculation information (e.g., identification information for identifying each value) to notify the information processing apparatus (STA) to be stored in the beacon frame it may be.
[0140]
　Extended CCA threshold value determination processing (step S714 shown in FIG. 8)]
　The information processing apparatus (STA) 200 control unit 230, based on the notification from the information processing apparatus (AP) 100, determines the extended CCA threshold setting to.
[0141]
　For example, the control unit 230 of the information processing apparatus (STA) 200, based on the notified margin value, the reception intensity of the reference frame (e.g., RSSI) and to determine the extension CCA threshold. Here, the reference frame is, for example, a beacon frame containing information indicating a change to the above-mentioned rule. Further, it may be a reference frame to another frame. Referring to FIG. 12, a description will be given extended CCA threshold value determination processing.
[0142]
　Figure 12 is a diagram showing an example of the extended CCA threshold determination process by the information processing apparatus (STA) 200 in the first embodiment of the present technology. In Figure 12, it shows an example of interaction between the information processing apparatus (AP) 100 and the information processing apparatus (STA) 200.
[0143]
　First, the communication unit 210 of the information processing apparatus (STA) 200 receives a beacon frame transmitted from the connection destination of the information processing apparatus (AP) 100.
[0144]
　Here, the connection destination of the information processing apparatus latest reference frame received from the (AP) 100 (beacon frame), the reception intensity in the information processing apparatus (STA) 200 to (RSSI) and R_ref (dBm). Further, it notified margin value from the information processing apparatus (AP) 100 In the notification process described above (the margin value specified by CCA Margin405 shown in FIG. 11) and M (dB). As R_ref, the measurement results over a plurality of reference frames may be used a value obtained by filtering the averaging or the like.
[0145]
　For example, the control unit 230 of the information processing apparatus (STA) 200 is a value obtained by subtracting a margin value M from the received intensity R_ref reference frame, is calculated as the upper limit value EXTCCA_TH_capable settable extended CCA threshold EXTCCA_TH. Specifically, using the following equation 1 to calculate an upper limit value EXTCCA_TH_capable. It should be noted that equation (1) of the following is a representation of a logarithm.
　　EXTCCA_TH_capable = R_ref-M ... formula 1
[0146]
　Subsequently, the control unit 230 of the information processing apparatus (STA) 200 is a range that does not exceed the upper limit value EXTCCA_TH_capable, changes the extended CCA threshold EXTCCA_TH (i.e., determines the extended CCA threshold). Thus, the signal processing apparatus (AP) 100 is transmitted, it is possible to increase the possibility of detecting the information processing apparatus (STA) 200.
[0147]
　Incidentally, it extended CCA threshold EXTCCA_TH_capable may be limit value by the upper limit value or lower limit value based on other factors.
[0148]
　Here, the value of the default extension CCA threshold EXTCCA_TH and EXTCCA_TH_default, the value of the extended CCA threshold EXTCCA_TH the changed (i.e., extended CCA threshold), the EXTCCA_TH_updated. For example, EXTCCA_TH_default may be a -82dBm per 20MHz bandwidth.
[0149]
　Further, the difference D_EXTCCA_TH between EXTCCA_TH_default and EXTCCA_TH_updated is calculated using the following equation 2. It should be noted, is a representation of the following equation 2 is also logarithmic. Further, D_EXTCCA_TH in equation shown after this are all dB values. 　　　= EXTCCA_TH_updated
　　D_EXTCCA_TH
-EXTCCA_TH_default ... Equation 2
[0150]
　Referring to Equation 1 described above, RSSI is greater the information processing apparatus (STA) as 200, changes to the high expansion CCA threshold EXTCCA_TH is allowed. Incidentally, expansion changes CCA threshold EXTCCA_TH has freedom within, is not necessarily the information processing apparatus (STA) 200 is a EXTCCA_TH_capable extended CCA threshold EXTCCA_TH_updated.
[0151]
　For example, the information processing apparatus (STA) 200 is may not be changed at all extended CCA threshold EXTCCA_TH. That is, the control information processing device (STA) 200, extended CCA threshold EXTCCA_TH may vary. Thus, it is possible to prevent the link state will have changed to the poor information processing apparatus (STA) 200 is highly scalable CCA threshold EXTCCA_TH, thereby increasing the unexpected transmission failure degrade the overall system performance.
[0152]
　[Interlocking parameter setting processing (step S715 shown in FIG. 8)]
　The information processing apparatus (STA) 200 control unit 230 sets to determine the association parameters (transmission parameters).
[0153]
　For example, the control unit 230 of the information processing apparatus (STA) 200 may be based on the difference between the extended CCA threshold and the default threshold value determined in the extended CCA threshold determination process described above (i.e., D_EXTCCA_TH), controls the interlocking parameters it can.
[0154]
　For example, the control unit 230 of the information processing apparatus (STA) 200 is the change amount according to the difference increases to increase the (scale of penalties or incentives), change amount according to the difference is smaller it can be reduced. This results in accordance with the increase rate or decrease width of the extended CCA threshold EXTCCA_TH, it is possible to appropriately mitigate the unfairness of the entire system.
[0155]
　The control unit 230 of the information processing apparatus (STA) 200 may set the integration parameters using interlocking parameter calculation information corresponding to the margin value. For example, the information processing apparatus (STA) 200 is intended to determine the integration parameters in compliance with changes rules notified from the information processing apparatus (AP) 100, shall never deviate. The following describes configuration examples of each transmission parameter.
[0156]
　[Configuration example of the transmission power]
　The information processing apparatus (STA) 200 control unit 230 of can be based on D_EXTCCA_TH, it changes the transmission power. For example, an example of a transmission power change with changes coefficients alpha, beta, shown in the following equation 3. Note that the transmission power after the change and P_updated, the transmission power to be a reference to the P_default, they are assumed to be dB value. The reference transmit power P_default is assumed to be shared in each of the information processing apparatus in the system (AP and the subordinate apparatus) in advance in some way. The following formula is a representation of a logarithm. 　　　= P_default
　　P_updated
- (D_EXTCCA_TH / Arufa) Tasu Beta ... Equation 3
[0157]
　For example, alpha is a case of a positive value, it is assumed that the extended CCA threshold EXTCCA_TH_updated is higher than the default threshold EXTCCA_TH_default. In this case, D_EXTCCA_TH depending on increases, decreases transmission power. That is, in accordance with extended CCA threshold EXTCCA_TH_updated increases, decreases transmission power.
[0158]
　Moreover, alpha is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated low. In this case, D_EXTCCA_TH depending on becomes smaller, it increases transmission power. That is, in accordance with extended CCA threshold EXTCCA_TH_updated decreases, increases transmission power.
[0159]
　Moreover, alpha is a case of a positive value, it is assumed that the extended CCA threshold EXTCCA_TH_updated is higher than the default threshold EXTCCA_TH_default. Even in such a case, P_updated calculated by Equation 3 described above is possible is likely higher than P_default. In this case, the control unit 230 of the information processing apparatus (STA) 200 is assumed to use P_default without changing the transmission power.
[0160]
　Similarly, alpha is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated low. Even in such a case, P_updated calculated by Equation 3 described above is possible is likely lower than P_default. In this case, the control unit 230 of the information processing apparatus (STA) 200 is assumed to use P_default without changing the transmission power.
[0161]
　Here, the control unit 230 of the information processing apparatus (STA) 200 is to use a transmission power lower than the calculated P_updated (i.e., using a different value in the direction of the own apparatus becomes more disadvantageous) the not restricted. In this case, the calculated P_updated, the control unit 230 are treated as the upper limit value that can be set.
[0162]
　Thus, if the penalty or incentives be imposed will act in the opposite direction, the control unit 230 of the information processing apparatus (STA) 200 is assumed to use a default transmission parameters. This also applies to other transmission parameters listed below.
[0163]
　[Configuration example of the transmission for a fixed wait time
　control section 230 of the information processing apparatus (STA) 200 can be based on D_EXTCCA_TH, it changes the transmission fixed latency.
[0164]
　Here, the transmission fixed waiting time is, for example, is equivalent to the IEEE (Institute of Electrical and Electronic Engineers) AIFS in 802.11 (Arbitration Inter Frame Space). Further, AIFS corresponds to the number of time slots must wait when performing transmission attempts (AIFSN (Arbitration Inter Frame Space number)).
[0165]
　That is, the control unit 230 of the information processing apparatus (STA) 200 can be based on D_EXTCCA_TH, change the AIFSN.
[0166]
　For example, by using a γ modifying coefficient (transmitting fixed waiting time change factor), an example of changing the AIFSN, shown in the following equation 4. Here, the AIFSN_updated the AIFSN the changed default AIFSN and AIFSN_default, they are to be true value. 　　　= AIFSN_default
　　AIFSN_updated
Tasu (D_EXTCCA_TH / Ganma) ... Equation 4
[0167]
　Here, the default AIFSN is intended to refer to the value of AIFSN information processing apparatus (AP) 100 is notified using EDCA Parameter IE of a beacon frame. This change in AIFSN is applied to all of the access category.
[0168]
　For example, gamma is a case of a positive value, it is assumed that the extended CCA threshold EXTCCA_TH_updated is higher than the default threshold EXTCCA_TH_default. In this case, depending on D_EXTCCA_TH increases, AIFSN (ie, the number of waiting slots) increases.
[0169]
　Further, for example, gamma is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated low. In this case, D_EXTCCA_TH depending on the smaller, AIFSN (ie, the number of waiting slots) is reduced.
[0170]
　Further, for example, using the κ variation coefficient (transmitting fixed waiting time change factor), an example of changing a slot time length T_slot, shown in the following formula 5. Here, the T_slot_updated the T_slot the changed default T_slot and T_slot_default, they are to be true value. 　　　=
　　T_slot_updated
T_slot_default × Kappa ... formula 5
[0171]
　Further, for example, using the τ modifying coefficient (transmitting fixed waiting time change factor), an example of changing the SIFS (Short Inter Frame Space) length which is waiting at AIFSN = 0, shown in Equation 6 below. Here, the SIFS_updated a SIFS after the change, the default SIFS and SIFS_default, they are to be true value.
　　SIFS_updated = SIFS_default × τ ... Equation 6
[0172]
　Here, the control unit 230 of the information processing apparatus (STA) 200 is used calculated AIFSN_updated, T_slot_updated, the use of long set value than SIFS_updated (i.e., different values ​​of the direction in which the own apparatus becomes more disadvantageous to it) is not limited.
[0173]
　[Configuration Example of carrier sensing random wait time
　random wait time carrier sense, for example, is equivalent to the CW (Contention Window) indicating the range of the random backoff in the IEEE802.11 standard. The CW, there is CWmin and CWmax. In the following, as an example, the control unit 230 of the information processing apparatus (STA) 200 is based on CWmin on D_EXTCCA_TH, an example for changing.
[0174]
　Using modified coefficients δ and epsilon, an example of changing the CWmin, shown in the following equation 7. Here, the CW_updated the CWmin the changed default CWmin and CW_default, they are to be true value. 　　　=
　　CW_updated
CW_default × (D_EXTCCA_TH /
　　　[delta]) + (D_EXTCCA_TH / epsilon) ... Equation 7
[0175]
　Here, the default CWmin is intended to refer to the value of CWmin information processing apparatus (AP) 100 is notified using EDCA Parameter IE of a beacon frame. This change in CWmin is applied to all of the access category. Incidentally, [delta] and ε may be assigned a different value for each access category.
[0176]
　Further, here, has been described CWmin, it may be performed similar changes with respect CWmax.
[0177]
　For example, [delta] and ε is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated high. In this case, depending on D_EXTCCA_TH increases (i.e., in accordance with the extended CCA threshold is increased), CWmin is increased, the expected value of the random waiting time is prolonged.
[0178]
　Furthermore, [delta] and ε is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated low. In this case, D_EXTCCA_TH according to the smaller (i.e., depending on the extended CCA threshold is lowered), CWmin is reduced, the expected value of the random waiting time is shortened.
[0179]
　Here, the control unit 230 of the information processing apparatus (STA) 200 is to use a long set value than the calculated CW_updated (i.e., using a different value in the direction of the own apparatus becomes more disadvantageous) the not restricted.
[0180]
　Maximum frame time length setting example]
　control unit 230 of the information processing apparatus (STA) 200 can be based on D_EXTCCA_TH, change the maximum frame length. The maximum frame length is, for example, corresponds to a PPDU (PLCP (Physical. Layer Convergence Protocol) Protocol Data Unit) duration.
[0181]
　For example, the control unit 230 of the information processing apparatus (STA) 200 is an upper limit provided in the PPDU duration, it may be determined based on the upper limit to D_EXTCCA_TH.
[0182]
　Using modified coefficients μ and [nu, an example of changing the upper limit value of the PPDU duration, shown in the following equation 8. Here, the PPDU duration upper limit value after the change and T_updated, and this is true value.
　　T_updated = μ-v × D_EXTCCA_TH ... Equation 8
[0183]
　For example, [nu is a case of a positive value, it is assumed that the extended CCA threshold EXTCCA_TH_updated is higher than the default threshold EXTCCA_TH_default. In this case, depending on D_EXTCCA_TH increases (i.e., in accordance with the extended CCA threshold is increased), T_updated (i.e., the time length of the PPDU) is shortened.
[0184]
　Also, [nu is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated low. In this case, D_EXTCCA_TH according to the smaller (i.e., depending on the extended CCA threshold is lowered), T_updated (i.e., the time length of the PPDU) becomes longer.
[0185]
　Here, the control unit 230 of the information processing apparatus (STA) 200 is to use a short set value than the calculated T_updated (i.e., using a different value in the direction of the own apparatus becomes more disadvantageous) the not restricted.
[0186]
　As described above, to change the exclusive time length of a radio resource, the effect that the maximum transmission information amount in one time of frame transmission, maximum packet connection number at a time of transmission, the maximum number of retransmissions of the same packet, a plurality of frames regard the maximum time length that can be used for continuous transmission, it is possible to apply the same calculation.
[0187]
　[Configuration of the available channel bandwidth Example
　information processing apparatus (STA) 200 control unit 230 of the available channel bandwidth in transmission can be changed based on D_EXTCCA_TH.
[0188]
　Using modified coefficients lambda, an example of changing the available channel bandwidth, shown in the following equation 9. Here, the available channel bandwidth after the change BW_updated, and BW_default default available channel bandwidth, the minimum granularity of the channel bandwidth and BW_unit, they are to be true value.
　　= BW_default BW_updated
　　　- {(lambda × D_EXTCCA_TH) / BW_unit}
　　　× BW_unit ... Equation 9
[0189]
　For example, lambda is a case of a positive value, it is assumed that the extended CCA threshold EXTCCA_TH_updated is higher than the default threshold EXTCCA_TH_default. In this case, depending on D_EXTCCA_TH increases (i.e., in accordance with the extended CCA threshold is increased), BW_updated (i.e., the available channel bandwidth) is narrowed.
[0190]
　Moreover, lambda is a case of a positive value, than the default threshold EXTCCA_TH_default assume a case extended CCA threshold EXTCCA_TH_updated low. In this case, D_EXTCCA_TH according to the smaller (i.e., depending on the extended CCA threshold is lowered), BW_updated (i.e., the available channel bandwidth) is widened.
[0191]
　Here, the control unit 230 of the information processing apparatus (STA) 200 is to use a small set value than the calculated BW_updated (i.e., using a different value in the direction of the own apparatus becomes more disadvantageous) the not restricted.
[0192]
　[Configuration of the available channel frequencies Example
　information processing apparatus (STA) 200 control unit 230 of the channel frequency that can be used for transmission can be changed based on D_EXTCCA_TH.
[0193]
　For example, the control unit 230 of the information processing apparatus (STA) 200 is D_EXTCCA_TH is is larger than the channel limited operation determination coefficient ω is to use the channel specified by the information processing apparatus (AP) 100.
[0194]
　Note that in the change of the respective transmission parameters described above, all of the plurality of change coefficients necessarily notice, may not be used. For example, only the α without β described above, epsilon without δ only, processing is also acceptable as that. This also applies to other embodiments.
[0195]
　[Transmission processing and reception response process]
　The information processing apparatus (STA) 200 control unit 230, as described above, to change the interlocking parameters (transmission parameters) based on the notification from the information processing apparatus (AP) 100. Then, the control unit 230 of the information processing apparatus (STA) 200, after the change, performs the extended CCA operation and transmission process. Note that the extended CCA operation, FIG. 3, shown in FIG.
[0196]
　The information processing apparatus (STA) 200 is, assume that as the interlocking parameters were changed transmit power. In this case, the control unit 230 of the information processing apparatus (STA) 200 notifies information regarding transmission power that sets the (transmission power information) to the connected information processing apparatus (AP) 100. For example, the control unit 230 of the information processing apparatus (STA) 200 transmits and stores the information indicating the transmission power P_updated the changed part of the frame. Thus, the information processing apparatus (AP) 100 is to match the change in the transmit power of the information processing apparatus (STA) 200 side, it is possible to perform transmission power control. Thus, an example of a frame format for notifying the transmission power after the change is shown in Figure 13.
[0197]
　[Format example of a frame used for transmitting]
　FIG. 13 is an information processing apparatus (STA) 200 in the first embodiment of the present technology is a diagram showing a format example of a frame to be used for transmission.
[0198]
　The a in FIG. 13, the PLCP header shows the frame format example in the case of storing the transmit power information. Specifically, an example of storing the transmit power information to SIG421 in PLCP header.
[0199]
　The b in FIG. 13, the MAC header 422, 423, shows a frame format example to store the transmission power information.
[0200]
　The c in FIG. 13, the payload portion 424 of the management frame indicates a frame format example to store the transmission power information. Incidentally, the payload portion 424 is coupled to a portion of the transmission frame by frame aggregation.
[0201]
　The d in FIG. 13, the payload portion 425 of the data frame EtherType of LLC-SNAP header is unusual value, shows a frame format example to store the transmission power information. Incidentally, the payload portion 425 is coupled to a portion of the transmission frame by frame aggregation.
[0202]
　Frame format shown in a and b in FIG. 13, although the overhead is small, it is necessary to change the existing format. Therefore, legacy device, will not be able to correctly obtain the data from the signal, which may perform unexpected operation.
[0203]
　Frame format shown in c and d of FIG. 13, the overhead is larger than the frame format shown in a and b in FIG. 13. However, the legacy device may skip transmission power information is stored, it is possible to ensure backward compatibility.
[0204]
　In FIG. 13, frame information processing apparatus (STA) 200 transmits is data frames, frame when the data frame is A-MPDU multiple frames are connected (aggregation MAC protocol data unit) It shows an example of the format. However, the information processing apparatus (STA) 200 may be configured to store transmission power information to any other frame. For example, the information processing apparatus (STA) 200 is a data frame that has not been aggregated, management frame, a control frame or the like, may be transmitted separately stores the transmission power information.
[0205]
　[Transmission Power Control Example
　control unit 130 of the information processing apparatus (AP) 100 can perform transmission power control based on the information notified from the information processing apparatus (STA) 200.
[0206]
　For example, the control unit 130 of the information processing apparatus (AP) 100, based on the transmission power information notified from the information processing apparatus (STA) 200, which sets the transmission power of a frame to be transmitted to the information processing apparatus (STA) 200 be able to. For example, the frame transmission power in the information processing apparatus (STA) 200 is a case where it is set lower than the reference transmission power, the control unit 130 of the information processing apparatus (AP) 100 is to be transmitted to the information processing apparatus (STA) 200 so that lower than the reference transmission power transmission power. This makes it possible penalties or incentives for fairness secured as the whole system is imposed. Also, if the individual transmit power of the apparatus constituting the system is lowered, interference is reduced thereby improving the efficiency of the entire system.
[0207]
　Further, for example, the control unit 130 of the information processing apparatus (AP) 100, the response frame by using the transmission power after the transmission power control, ACK / NACK for the frame received from the information processing apparatus (STA) 200 (Negative ACKnowledgement) and it may be returned to the information processing apparatus (STA) 200.
[0208]
　The information processing apparatus (STA) 200 determines the extended CCA threshold based on the reception intensity of the reference frame. Therefore, the information processing apparatus (AP) 100, it is preferable to maintain the transmission power of the reference frame to a predetermined value (reference transmission power).
[0209]
　Thus, the control unit 230 of the information processing apparatus (STA) 200, based on the information included in the transmitted frame (e.g., a margin value) from the information processing apparatus (AP) 100, the control for changing the extended CCA threshold It can be performed. For example, the control unit 230 of the information processing apparatus (STA) 200 is a margin value included in the frame, based on the reception strength of the frames, it is possible to change the extended CCA threshold. The control unit 230 of the information processing apparatus (STA) 200 can change the extended CCA threshold within a range determined based on the margin value and its reception strength.
[0210]
　The control unit 230 of the information processing apparatus (STA) 200, based on the information included in the frame transmitted from the information processing apparatus (AP) 100, a change amount from the reference value of the extended CCA threshold, wireless transmission it is possible to determine the parameters. For example, transmission power, transmission fixed waiting time, the carrier sense for a random wait time, the maximum frame length, the available channel bandwidth, it is possible to determine at least one of the available channel frequencies.
[0211]
　Other Processing Example]
　The information processing apparatus (AP) 100 control unit 130 of using the margin values and interlocking parameter calculation information determined by the own device, so as to make a dynamic change of EXTCCA_TH and transmission parameters it may be.
[0212]
　In this case, the subordinate apparatus of the information processing apparatus (AP) 100 (e.g., the information processing apparatus (STA) 200) is required to periodically send a reference frame with respect to the information processing apparatus (AP) 100. Incidentally, the information processing apparatus (STA) 200, even if it is changed the transmission power by the process described above, the transmission power of the reference frame is preferably maintained at a predetermined value.
[0213]
　Control unit 130 of the information processing apparatus (AP) 100, among the reception intensity of the reference frame from all subordinate apparatus (STA), the smallest reception intensity, treated as R_ref described above, as described above, extended CCA threshold determination processing may be performed in conjunction parameter setting processing or the like. Here, the reception intensity handled as R_ref is not necessarily the smallest reception intensity may be received intensity selected by other criteria. For example, the largest reception strength, the average value / mean value obtained from a certain plurality of reception intensity samples, finally the received signal strength of the signal from the subordinate device receives (STA), a signal from the destination device finally own device transmits the intensity of the received, such as the most recent reception strength from the destination device that is attempting to transmit the own device then can be considered. Incidentally, the information processing apparatus (AP) 100, even if the transmission power is changed, the transmit power of the reference frame is preferably maintained at a predetermined value.
[0214]
　Margin value and interlocked parameter combination example share the calculation information]
　combination of the margin value and the interlocking parameter calculation information shown in FIG. 10, may be shared by the information processing apparatus (STA) 200. If this sharing is so, notification processing can reduce the amount of information to be notified to the information processing apparatus (STA) 200 from the information processing apparatus (AP) 100 (Step S713 shown in FIG. 8), the notification it is possible to simplify the frame format for.
[0215]
　For example, identification information for identifying each of the combinations of margin values ​​and interlocking parameter calculation information (e.g., mode number), the information processing apparatus (AP) 100 and the information processing apparatus to be shared between (STA) 200 it can. And the mode number, an example of the relationship between the combination of the margin values ​​and interlocking parameter calculation information, shown in FIG. 14.
[0216]
　Figure 14 is a diagram showing an example of a combination of Margin value and interlocking parameter calculation information to be shared by the information processing apparatus (AP) 100 and the information processing apparatus (STA) 200 in the first embodiment of the present technology .
[0217]
　Control unit 130 of the information processing apparatus (AP) 100, in the notification process (step S713 of FIG. 8), as information indicating a combination of the interlocking parameter calculation information and margin value, and notifies the mode number. In this case, the control unit 230 of the information processing apparatus (STA) 200 refers to the information shown in FIG. 14, based on the notified mode number, a combination of the interlocking parameter calculation information and margin value it can be acquired. Thus, for notifying the mode number, an example of a format when storing a mode number in the beacon frame in FIG.
[0218]
　[Format example of a beacon for notifications of mode number]
　FIG 15 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the first embodiment of the present technology.
[0219]
　The payload 431 in a beacon frame shown in FIG. 15, Dynamic CCA Parameters432 is arranged. The Dynamic CCA Parameters432, as the information indicating the adjustment rules, information for notifying the mode number is stored.
[0220]
　Specifically, Dynamic CCA Parameters432 includes Element ID433, and Length434, composed of a Mode Index435.
[0221]
　The Element ID433, identification information is stored. The Length434, field length are stored. The Mode Index435, information for specifying the mode number is stored.
[0222]
　Thus, the control unit 130 of the information processing apparatus (AP) 100 includes a first information used to determine the extended CCA threshold, the information for identifying a set of the radio transmission parameters in conjunction with the first information performs control to transmit to the information processing apparatus (STA) 200. The information processing apparatus (AP) 100 and the information processing apparatus (STA) 200 is information for identifying a set of the first information and the radio transmission parameters can be shared with other devices belonging to the same network .
[0223]
　In this example, the combination of Margin value and interlocking parameter calculation information, an example of sharing between the information processing apparatus (AP) 100 and the information processing apparatus (STA) 200. However, the combination of the margin values ​​and interlocking parameter calculation information may be shared with the information processing apparatus (AP) belongs to another network. That is, the information processing apparatus (AP) 100 and the information processing apparatus (STA) 200 is information for specifying a combination thereof, and other equipment belonging to the same network, one of the other devices belonging to another network at least one can be shared.
[0224]
　The information processing apparatus (STA), it is necessary all are equal, it is not possible to only partially use the favorable list. However, the information processing apparatus (AP), is considered to be the favorable conditions than the information processing apparatus (STA). Therefore, the combination information processing apparatus (AP) 100 is held (the candidate list of combinations of margin values ​​and interlocking parameter calculation information), than the combination information processing apparatus (STA) 200 is held, advantageous information ( it may be an advantageous alternative of the list).
[0225]
　[Explicit modification to require authorization to extend CCA Operation
　when performing extended CCA operation may be require explicit permission from the information processing apparatus (AP) 100. Specifically, the information processing apparatus (AP) 100 notifies the subordinate apparatus (STA) permitted or not to add information in the beacon frame. Also, the subordinate apparatus in the BSS (STA) is to follow the information contained in the beacon. Shows a format example of a beacon in this case is shown in FIG. 16.
[0226]
　[Format example of a beacon]
　FIG 16 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus according to the first embodiment of the present technology.
[0227]
　Example shown in FIG. 16, in the Dynamic CCA Parameters402 shown in FIG. 11, an example of adding Allow Extended CCA415. Incidentally, a field example having the same name shown in FIG. 11, in order to correspond to the example shown in FIG. 11, description thereof will be omitted here.
[0228]
　The field of Allow Extended CCA415, the information processing apparatus (STA, AP) in the BSS, each of the information indicating whether to permit to perform the extended CCA operation is stored.
[0229]
　The information processing apparatus (STA), when receiving the beacon frame on the basis of the information stored in the Allow Extended CCA415 in the beacon frame, it confirms whether or not to perform the extended CCA operation is permitted . The information processing apparatus (STA) only if the extended CCA operation is permitted, performs the extended CCA operation. On the other hand, if it is not allowed, even HE apparatus corresponding to the extended CCA operation, to maintain the same operation as the legacy device. In this case, the content of the field of fields and Linked Parameter List406 of CCA Margin405 shall be not be used.
[0230]
　Other examples are also used in combination changing carrier sensing threshold]
　In addition to the change of the extended CCA threshold, changing the usual detection threshold for carrier sense may be used in combination. The normal detection threshold for carrier sense, specifically refers to the preamble detection threshold, energy detection threshold, the CCA Mid Packet detection threshold. For example, to change the preamble detection threshold can be controlled to a value less extended CCA threshold determined.
[0231]
　<2. Second Embodiment>
　In the second embodiment of the present technology, an example of setting the upper limit level of the extended CCA threshold, the lower-limit level or the like of the transmission power.
[0232]
　The configuration of the information processing apparatus according to the second embodiment of the present technique, the information processing apparatus (AP) 100 shown in FIGS. 1 and 2, etc., are substantially identical to the information processing apparatus (STA) 200, 250 . Therefore, portions which are common with the first embodiment of the present technology, the description thereof is partially omitted with the same reference numerals as in the first embodiment of the present technology.
[0233]
　[Overall Processing]
　The overall process is similar to the first embodiment of the present technology, description thereof will be omitted here.
[0234]
　Extended CCA for margin determination processing]
　The margin determination processing for expansion CCA is similar to the first embodiment of the present technology. However, in the second embodiment of the present technology, the information processing apparatus (AP) 100 is configured to determine the margin value, the information processing apparatus (AP) 100 subordinate apparatus (STA) to be used in conjunction parameter setting process determining a parameter (transmission power lower limit level). The transmission power lower limit level is preferably determined based on the intensity of the interference. The following shows an example of determining the transmission power lower limit level.
[0235]
　For example, the information processing apparatus (AP) 100, the average intensity of the interference is measured by monitoring, for the measured values and I. The information processing apparatus (AP) 100 sets the level that can ensure a sufficient SINR for its I and noise power N at the lower limit level (transmission power lower limit level). The lower limit level and LL. Only the SINR is modulation and coding scheme (MCS) can secure a sufficient transmission characteristics, when the SINR (m) the index of MCS as m, the lower limit level LL corresponding to each m (m) The following expression 10 in represented. Equation 10 is a representation of the true value.
　　LL (m) = SINR (m ) × {I + N} ... Equation 10
[0236]
　Here, for each LL (m) may be at to a value predetermined offset to the value obtained is added by Equation 10. Further, LL may not necessarily only the number of MCS to be used, for example, may be represented by LL assuming a specific MCS.
[0237]
　[Interlocking parameter information determination process]
　For interlocking the parameter information determining process is similar to the first embodiment of the present technology. However, in the second embodiment of the present technology, as interlocking parameters shall include information on at least the transmission power.
[0238]
　[Notification processing]
　The information processing apparatus (AP) 100 control unit 130 of notifies the generated information indicating a change rule to the information processing apparatus (STA) 200. In a second embodiment of the present technology, the information processing apparatus (AP) 100 has stored a margin value for extended CCA threshold calculation, the interlocking parameter calculation information (including at least transmission power lower limit level) to the frame and shows an example of notification. Frame to store each of them information, for example, may be a beacon frame to be notified to the whole subordinate apparatus (STA), may be other management frames be individually notified. Here, as an example, it shows a format example of a case of storing their respective information in the beacon frame.
[0239]
　[Format example of a beacon]
　FIG 17 is a diagram showing a format example of a beacon frame exchanged between the information processing apparatus of the second embodiment of the present technology.
[0240]
　The payload 441 in a beacon frame shown in FIG. 17, the Associated STAs Info442, and Tx Power Info443, and a Dynamic CCA Parameters444 are arranged.
[0241]
　The example shown in FIG. 17, in the payload 401 shown in FIG. 11, an example of adding the Associated STAs Info442 and Tx Power Info443. Also, the example shown in FIG. 17, in the Dynamic CCA Parameters402 shown in FIG. 11, an example of adding a Lower Limitation Level List455. Therefore, field instances of the same name shown in FIG. 11, in order to correspond to the example shown in FIG. 11, description thereof will be omitted here.
[0242]
　Associated STAs Info442 is, the Element ID445, constituted by the Length446, and Number of Active HE-STA447, and Number of Active Legacy STA448.
[0243]
　The Element ID445, identification information is stored. The Length446, field length are stored.
[0244]
　The Number of Active HE-STA447, the number of devices having a specific function of the information processing apparatus under (AP) 100 is connected apparatus (STA) (HE device) is stored.
[0245]
　The Number of Active Legacy STA448, the number of the legacy devices of the information processing apparatus under the control apparatus (AP) 100 is connected (STA) is stored.
[0246]
　Thus, the information processing apparatus (AP) 100 receives the beacon transmitted from another information processing apparatus in this format (AP), grasp the number of HE devices and legacy devices belonging to other wireless networks can do.
[0247]
　In the case of storing the number of each device, it may be stored the number of devices in consideration of the amount of traffic per time with. For example, the connection has not been communicating at all devices, there is no contribution of the interference with the communication of other stations, to reduce the contribution to the time of counting, or, may be omitted from the coefficient.
[0248]
　Tx Power Info443 is, the Element ID449, and Length450, constituted by the Tx Power451.
[0249]
　The Element ID449, identification information is stored. The Length450, field length are stored.
[0250]
　The tx Power451, information for specifying the transmission power used for transmission (e.g., the reference transmission power) of the reference frame (a beacon) are stored.
[0251]
　Dynamic CCA Parameters444 includes Element ID 452, constituted by a Length453, the CCA Margin454, the Lower Limitation Level List455, a Linked Parameter List456.
[0252]
　Lower Limitation Level List455 includes a Num of Entries457, the Lower Limitation Level 1 458, a Lower Limitation Level (M-1) 459, composed of the Lower Limitation Level M 460. Thus, Lower Limitation Level is composed of M number of fields. Here, M indicates the number of lower-level values.
[0253]
　The Num of Entries457, the number of values ​​of the transmission power lower limit level is stored.
[0254]
　Lower the Limitation Level 1 458, the value LL of the transmission power lower limit level determined by the above-described extended CCA for margin determination process (transmission power margin determination processing) is stored. Also, if the LL there is a plurality, they are sequentially stored. For example, stored in the Lower Limitation Level (M-1) 459, Lower Limitation Level M 460.
[0255]
　The position information of the Associated STAS Info442 and Lower Limitation Level List455 is stored, hierarchy is not limited to the example shown in FIG. 17, other positions may be hierarchical.
[0256]
　Extended CCA threshold determination process]
　In the second embodiment of the present technology, the information processing apparatus (STA) 200, using Equation 1 described above, calculates the upper limit value EXTCCA_TH_capable, further limit on the calculated EXTCCA_TH_capable performing an operation to provide.
[0257]
　Here, EXTCCA_TH_capable is a upper limit for setting EXTCCA_TH_updated, the calculation is for specifying an upper limit value of EXTCCA_TH_capable.
[0258]
　The information processing apparatus (STA) 200 can be determined by calculating back the upper limit value, the change in the transmit power which is set by the interlocking parameter setting processing. The following describes the calculation method.
[0259]
　For example, the information processing apparatus (STA) 200 is minute as high reception intensity of the margin value than EXTCCA_TH information processing apparatus (AP) 100, a signal device itself has sent is received by the information processing apparatus (AP) 100 the transmission power is estimated to be the lower limit of the settable transmission power. Specifically, the information processing apparatus (STA) 200 is a value obtained by adding the default extension CCA threshold and margin value of the information processing apparatus (AP) 100 to a value obtained by subtracting the received intensity from the transmission power of the reference frame, set possible as the lower limit TXPOWER_capable of the transmission power. That is, using the following equation 11, it is possible to calculate the lower limit TXPOWER_capable a configurable transmit power. Here, EXTCCA_TH_default the default extension CCA threshold of the information processing apparatus (AP) 100 is assumed to be a common value known in the information processing apparatus in the system. In addition, the following equation 11 is a representation of a logarithm. 　　　=
　　TXPOWER_capable 　　　TXPOWER_ref-R_ref Tasu EXTCCA_TH_default Tasu M ... formula 11

[0260]
　Here, in equation 11, to the connection destination of the information processing apparatus latest reference frame received from the (AP) 100 (beacon frame), the reception intensity in the information processing apparatus (STA) 200 to (RSSI) and R_ref (dBm) . Also, a margin value notified from the information processing apparatus (AP) 100 In the notification process described above and M (dB), the transmission power of the reference frame which has been notified from the information processing apparatus (AP) 100 and TXPOWER_ref. Incidentally, R_ref is the measurement result over a plurality of reference frames may be a value obtained by filtering the averaging or the like. In addition, M is a margin value. Further, TXPOWER_capable the value by the upper limit value or lower limit value based on other factors may be limited.
[0261]
　Subsequently, the information processing apparatus (STA) 200, using the following equation 12, performs a lower limit processing TXPOWER_capable. 　　　=
　　TXPOWER_capable 　　　Max (TXPOWER_capable, TXPOWER_ref-R_ref Tasu R_LL) ... Equation 12

[0262]
　Here, in equation 12, the lower limit received level R_LL is calculated on the basis of the information processing apparatus lower level information notified from (AP) 100 LL (m) in the notification process. For example, in the LL (m), it can be R_ref (e.g., RSSI beacons) a maximum value not exceeding the R_LL. Further, R_ref is lower than any of LL (m) may be a R_LL the minimum value of the LL (m). The information processing apparatus (STA) 200 may a predetermined offset that is shared between the advance information processing apparatus (AP) 100 to determine the R_LL after adding the LL (m).
[0263]
　The information processing apparatus (STA) 200 is a range that does not fall below the lower limit TXPOWER_capable (i.e., not to fewer than the range), it can be determined TXPOWER_updated.
　Abort the reception of the packet when detecting a packet is determined to have been transmitted from different second network from the first network to which the own device belongs, the control to handle the carrier sense as an idle state based on the reception intensity of the packet the information processing apparatus having a control unit for performing.
[Claim 2]
　Wherein the control unit, the information processing apparatus according to claim 1, wherein performing the control treated as idle carrier sense based on the comparison result between the reception intensity and the first threshold value of the packet.
[Claim 3]
　Wherein, based on the network identifier added to the header of the physical layer in the packet, the information processing apparatus according to claim 2, wherein identifying the second network to which belongs transmitted device the packet.
[Claim 4]
　Wherein the control unit includes a network identifier added to the header of the physical layer in the packet, based on a comparison result between the network identifier of the first network, according to claim 3 information processing apparatus according identifying the second network .
[Claim 5]
　Wherein the control unit includes a network identifier added to the header of the data link layer in the packet, the first based on a comparison result of the network of the network identifier, the information processing according to claim 2, wherein identifying the second network apparatus.
[Claim 6]
　Wherein the control unit, information for specifying a set of the radio transmission parameters in conjunction with the first information and the first information used in the determination of the first threshold value other devices belonging to the first network uses the other information processing apparatus according to claim 2, wherein performing control of transmitting to the device.
[Claim 7]
　Wherein, as the first information, and the information for specifying the first threshold value, the first threshold value in the other device which receives the reference frame based on the ratio of the reception intensity of the reference frame the information processing apparatus according to claim 6, wherein performing control of transmitting one of the information for specifying a range of changing.
[8.]
　The radio transmission parameters, and the transmission power in at least one of a transmitting fixed latency, the carrier sense random wait time, the maximum frame length, and the available channel bandwidth, and the available channel frequency the information processing apparatus is claimed in claim 6, wherein.
[Claim 9]
　Wherein, when said contains information about transmission power of the frame to the frame of the subject apparatus transmitted from other devices belonging to the first network, based on the information about the transmission power, the the information processing apparatus according to claim 1, wherein by changing the transmission power of the acknowledgment frame performs control to transmit the acknowledgment.
[Claim 10]
　The reference frame, the information processing apparatus according to claim 9, wherein the beacon transmitted from the devices belonging to the first network.
[Claim 11]
　Wherein the information processing apparatus, information for specifying a set of the said the first information radio transmission parameters, and other equipment belonging to the first network, of the other devices belonging to the second network at least one information processing apparatus according to claim 6 wherein the share.
[Claim 12]
　Wherein, said first threshold value is changed, the information processing apparatus according to claim 2, wherein performing control of transmitting the data based on the radio transmission parameters are changed in response to the first threshold value after the change.
[Claim 13]
　Wherein the control unit, the information processing apparatus according to claim 12, wherein varying the radio transmission parameters in conjunction with the first threshold value.
[Claim 14]
　Wherein the control unit, the information processing apparatus according to claim 2, wherein performing the control of changing the first threshold value based on the information included in the frame transmitted from another device belonging to the first network.
[Claim 15]
　Wherein the control unit includes a margin value contained in the frame, the information processing apparatus according to claim 14, wherein based on the reception strength of the frame performs the control for changing the first threshold value.
[Claim 16]
　Wherein the control unit, the information processing apparatus according to claim 15, wherein performing the control of changing the first threshold value within a range determined based on the margin value and the reception intensity.
[Claim 17]
　Wherein the control unit, wherein performing the control for determining the radio transmission parameter based on the change amount from the reference value of information and the first threshold value contained in the frame transmitted from another device belonging to the first network the information processing apparatus claim 12, wherein.
[Claim 18]
　The radio transmission parameter is a parameter for setting the transmission power,
　wherein, when changing the radio transmission parameters, the frame to be transmitted to the devices belonging to the first network, of the changed performs control to include information about transmission power set by the radio transmission parameters
information processing apparatus according to claim 12, wherein.
[Claim 19]
　Wherein the frame, the information processing apparatus according to claim 17, wherein the beacon transmitted from the devices belonging to the first network.
[Claim 20]
　A first network to which the own apparatus belongs and the first procedure to abort the reception of the packet when detecting a packet is determined to have been sent from a different second network
　idle carrier sense based on the reception intensity of the packet a second procedure to be handled as
an information processing method comprising the.