WO2016006312A1 - 情報処理装置、情報処理方法およびプログラム - Google Patents
情報処理装置、情報処理方法およびプログラム Download PDFInfo
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- WO2016006312A1 WO2016006312A1 PCT/JP2015/063346 JP2015063346W WO2016006312A1 WO 2016006312 A1 WO2016006312 A1 WO 2016006312A1 JP 2015063346 W JP2015063346 W JP 2015063346W WO 2016006312 A1 WO2016006312 A1 WO 2016006312A1
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Definitions
- This technology relates to an information processing apparatus. Specifically, the present invention relates to an information processing apparatus and information processing method for exchanging information using wireless communication, and a program for causing a computer to execute the method.
- a wireless communication technology for exchanging information using wireless communication.
- a communication method for example, an autonomous distributed wireless network
- autonomously interconnects with adjacent information processing apparatuses has been proposed.
- this communication method it is possible to exchange information between the two information processing apparatuses using wireless communication without connecting via a wired line.
- carrier sense is adopted as an arbitration method for avoiding packet collision during communication between information processing apparatuses.
- Patent Document 1 For example, a wireless communication device that suppresses transmission by dynamically setting a carrier sense level threshold based on desired wave power has been proposed (for example, see Patent Document 1).
- This technology was created in view of such a situation, and aims to use radio resources efficiently.
- the present technology has been made in order to solve the above-described problems.
- the first aspect of the present technology is that the reception of the packet is interrupted in the middle according to the first condition, and further, the reception of the packet according to the second condition.
- An information processing apparatus having a control unit that performs control to operate the time from the start of reception until the reception of the packet is terminated as if the carrier sense was in an idle state, an information processing method thereof, and a program for causing a computer to execute the method .
- the reception of the packet is interrupted in the middle according to the first condition, and the time from the start of packet reception until the reception of the packet is canceled according to the second condition is operated as if the carrier sense was in the idle state. Bring.
- control unit performs control so as not to generate a waiting time corresponding to IFS (Inter Frame Frame) when the second condition is satisfied after the reception of the packet is terminated. You may do it.
- IFS Inter Frame Frame
- control unit when the second condition is satisfied after the reception of the packet is terminated, is a reception termination time from the time when the carrier sense transitions to BUSY when the packet is received. Control may be performed to convert the time length up to the slot time and subtract it from the back-off counter.
- the second condition is satisfied after the packet reception is aborted, the time length from the time when the carrier sense transitions to BUSY at the time of packet reception until the reception abort time is converted into the slot time and the back-off counter The effect of subtracting from is brought about.
- control unit may treat the result as 0 when the result after the subtraction becomes a negative value. As a result, when the result after subtraction becomes a negative value, the result is treated as 0.
- the control unit corrects the negative value so as not to exceed the back-off counter before the subtraction. It may be set to a value that is folded back. As a result, when the result after subtraction becomes a negative value, the negative value is turned back to a positive value so as not to exceed the back-off counter before the subtraction.
- the first condition includes that the CRC calculation result for the physical header part in the packet being received does not match the CRC information described in the physical header. You may make it. This brings about the effect that the first condition is that the CRC calculation result for the physical header part in the packet being received does not match the CRC information described in the physical header.
- the first condition is that when there is information about an identifier for identifying a network in a physical header in the packet, the information about the identifier is the network to which the information processing apparatus belongs. What is different from a network identifier may further be included.
- the first condition is that the information relating to the identifier is different from the network identifier of the network to which the device belongs. .
- the first condition is that a threshold value obtained by calculating a preamble correlator output level in terms of antenna input of the packet being received from information described in a physical header of the packet. May be further included.
- the first condition is that the preamble correlator output level in terms of antenna input of the packet being received is below the threshold derived from the information described in the physical header of the packet. Bring.
- the control unit includes information on an identifier for identifying a network in a physical header in the packet, and the information on the identifier is a network identifier of a network to which the information processing apparatus belongs. If they match, the reception may be continued without being terminated. As a result, when there is information on an identifier for identifying the network in the physical header in the packet, and the information on the identifier matches the network identifier of the network to which the device belongs, the reception is continued without being aborted. Bring about an effect.
- control unit may perform the derivation based on an association between an index described in a physical header in the packet and a threshold table shared in advance. . This brings about the effect
- control unit performs the derivation by conversion based on a value described in a physical header in the packet and information on quantization and units shared in advance. Also good. This brings about the effect
- the second condition may include the first condition.
- the second condition including the first condition is used.
- control unit may determine whether the operation is necessary based on the second condition that the received power of the packet being received is lower than a predetermined energy detection threshold. May be. This brings about the effect that the second condition is that the received power of the packet being received is below a predetermined energy detection threshold.
- control unit determines whether the operation is necessary based on the second condition that transmission suppression by virtual carrier sense is not applied at the time when the reception of the packet is terminated. You may do it. This brings about the effect that the second condition is that transmission suppression by virtual carrier sense is not applied at the time when reception of the packet is terminated.
- the control unit does not match the CRC calculation result for the physical header part in the packet with the CRC information described in the physical header, and Whether the operation is necessary or not may be determined on the basis of the second condition that the preamble correlator output level in terms of antenna input is below a minimum of applicable packet detection thresholds.
- the CRC calculation result for the physical header part in the packet does not match the CRC information described in the physical header, and the preamble correlator output level is the smallest of the applicable packet detection thresholds.
- the second condition is that it is lower than the above condition, so that it is possible to determine whether or not the operation is necessary.
- control unit prohibits transmission from the information processing apparatus during the duration of the packet transfer when the second condition is not satisfied after the reception of the packet is terminated. May be performed. As a result, when the second condition is not satisfied after the reception of the packet is terminated, the transmission from the own apparatus during the duration of the packet transfer is prohibited.
- control unit does not satisfy the second condition after the reception of the packet is terminated and prohibits transmission from the information processing apparatus during the duration of the packet transfer.
- control for transmitting a response to the frame may be performed.
- FIG. 7 is a flowchart illustrating an example of a processing procedure of physical header parameter determination processing by the information processing device 200 according to the first embodiment of the present technology. It is a figure showing an example of composition of a correlator provided in information processor 200 in a 1st embodiment of this art.
- FIG. 6 is a flowchart illustrating an example of a processing procedure of transmission / reception processing by the information processing device 100 according to the first embodiment of the present technology. It is a flowchart which shows the packet detection determination process among the transmission / reception processes by the information processing apparatus 100 in 1st Embodiment of this technique.
- 14 is a flowchart illustrating an example of a processing procedure of transmission / reception processing by the information processing device 100 according to the second embodiment of the present technology. It is a figure which shows an example of the format of PPDU exchanged between each apparatus which comprises the communication system 10 in 3rd Embodiment of this technique. It is a figure which shows an example of the format of PPDU exchanged between each apparatus which comprises the communication system 10 in 4th Embodiment of this technique.
- 38 is a flowchart illustrating packet detection / reception determination processing in transmission / reception processing by the information processing device 100 according to the tenth embodiment of the present technology. It is a figure which shows an example of the format of PPDU exchanged between each apparatus which comprises the communication system 10 in 11th Embodiment of this technique. It is a figure which shows an example of the beacon frame format exchanged between each apparatus which comprises the communication system 10 in 11th Embodiment of this technique. 38 is a flowchart illustrating an example of a processing procedure of a used physical header determination process by the information processing device 100 according to the eleventh embodiment of the present technology.
- FIG. 36 is a flowchart illustrating an example of a processing procedure of physical header parameter determination processing by the information processing device 200 according to the twelfth embodiment of the present technology. It is a figure which shows an example of the beacon frame format exchanged between each apparatus which comprises the communication system 10 in 12th Embodiment of this technique.
- First Embodiment Example in which a Link Strength Category field is provided in the SIGNAL field of the IEEE 802.11 standard and packet detection conditions are set according to the information processing apparatus.
- Second Embodiment Example in which packet transmission determination result is only energy detection, and no transmission is performed when transmission suppression is set
- Third Embodiment Example in which Link Strength Category field is provided in the Service field of the IEEE 802.11 standard 4).
- Fourth Embodiment (Example in which a plurality of preamble sequences having different detection thresholds are used on the transmission side, and the reception side switches the preamble correlation detector applied by RSSI) 5.
- Fifth embodiment (example in which a master station side selects a physical header used by a subordinate information processing apparatus) 6).
- Sixth Embodiment (Example of generating a plurality of PLCP preambles for distinction by processing a part of an original sequence, not a complete separate sequence) 7).
- Seventh embodiment (example of direct communication between slave stations) 8).
- Eighth embodiment (example in which a slave station determines physical header parameters used between direct links) 9.
- FIG. 1 is a diagram illustrating a system configuration example of a communication system 10 according to the first embodiment of the present technology.
- the communication system 10 includes information processing apparatuses 100 to 103 and information processing apparatuses 200 and 201.
- the information processing apparatuses 100 to 103 are, for example, portable information processing apparatuses having a wireless communication function.
- the portable information processing apparatus is an information processing apparatus such as a smartphone, a mobile phone, or a tablet terminal.
- the information processing apparatuses 100 to 103 are provided with a communication function compliant with, for example, IEEE (Institute of Electrical and Electronic Engineers) 802.11 wireless LAN (Local Area Network) standard.
- IEEE Institute of Electrical and Electronic Engineers
- 802.11 wireless LAN Local Area Network
- this wireless LAN for example, Wi-Fi (Wireless Fidelity), Wi-Fi Direct, Wi-Fi CERTIFIED Miracast specifications (technical specification name: Wi-Fi Display) can be used. Further, wireless communication using another communication method may be performed.
- the information processing apparatuses 200 and 201 are, for example, fixed information processing apparatuses having a wireless communication function.
- the fixed information processing apparatus is an information processing apparatus such as an access point or a base station.
- the information processing apparatuses 200 and 201 are provided with a communication function based on, for example, the IEEE802.11 wireless LAN standard, similarly to the information processing apparatuses 100 to 103. Further, wireless communication using another communication method may be performed.
- the information processing apparatuses 200 and 201 function as parent stations, and the information processing apparatuses 100 to 103 function as slave stations. That is, in the first embodiment of the present technology, an example of communication between a master station and a slave station is shown in a star topology including a master station and a slave station under the master station. Further, in the first embodiment of the present technology, a communication example is illustrated in which a destination transmitted by transmission of a subordinate slave station is limited to the master station.
- the legacy device can be, for example, an information processing device having a communication function compliant with IEEE 802.11a, IEEE 802.11g, IEEE 802.11n, or IEEE 802.11ac wireless LAN standards.
- the communication system 10 is configured by four slave stations (information processing apparatuses 100 to 103), the number of slave stations (information processing apparatuses) is not limited to four. That is, the embodiment of the present technology can also be applied to a communication system including three or five or more slave stations (information processing apparatuses).
- the relationship between two information processing apparatuses that perform communication may be such that one of them is a master station and the other is a slave station. Further, the connection between the two information processing apparatuses may be a direct communication connection between the slave stations.
- a technique called carrier sense is generally adopted as a mediation mechanism for avoiding packet collision.
- the carrier sense is to monitor the surrounding wireless status for a certain period of time before transmitting, and confirm whether there is another information processing apparatus that is transmitting. If reception power equal to or greater than the threshold is detected during the confirmation, it is determined that the radio is busy, the transmission operation is stopped, and the transmission is not performed.
- carrier sense there are two types of detection algorithms, namely, preamble detection that is detected by comparing the power of the correlator output of a specific preamble, and energy detection that is detected by comparing the power of the received signal itself.
- a detection algorithm is used together.
- the two types of detection algorithms will be collectively referred to as carrier sense unless otherwise specified.
- the above-described carrier sense technique may cause a situation in which excessive transmission suppression occurs and the transmission efficiency of the entire system decreases.
- FIG. 1 there are two master stations (information processing devices 200 and 201) and four slave stations (information processing devices 100 to 103).
- the information processing apparatuses 100 and 101 are connected to the information processing apparatus 200
- the information processing apparatuses 102 and 103 are connected to the information processing apparatus 201 and can communicate with each other.
- the connection relationship between the devices is schematically shown by dotted lines.
- the information processing apparatuses 100 to 103, 200, and 201 are assumed to exist in a positional relationship in which transmissions from all the information processing apparatuses can be detected by carrier sense.
- the information processing apparatus 100 transmits to the information processing apparatus 200 and the information processing apparatus 102 transmits to the information processing apparatus 201.
- Example of carrier sense detection range 2 and 3 are diagrams illustrating a system configuration example of the communication system 10 according to the first embodiment of the present technology. 2 and 3 show an example in which the carrier sense detection range of each information processing apparatus is superimposed on the example shown in FIG.
- the carrier sense detection ranges 11 to 16 of the information processing apparatuses 100, 102, 200, and 201 are schematically shown by dotted circles.
- the carrier sense detection range 11 indicates the carrier sense detection range of the information processing device 200
- the carrier sense detection range 12 indicates the carrier sense detection range of the information processing device 201.
- the carrier sense detection range 13 indicates the carrier sense detection range of the information processing device 100
- the carrier sense detection range 14 indicates the carrier sense detection range of the information processing device 102.
- the carrier sense detection range 15 indicates the carrier sense detection range of the information processing apparatus 100 after the carrier sense detection range 13 shown in FIG. 2 is changed.
- the carrier sense detection range 16 indicates the carrier sense detection range of the information processing apparatus 102 after changing the carrier sense detection range 14 shown in FIG.
- carrier sense is an example of an arbitration mechanism for avoiding packet collision, and performs transmission suppression according to the presence / absence of another information processing apparatus that performs transmission.
- the carrier sense detection range is determined in correspondence with a threshold value used when detecting a transmission signal from another information processing apparatus.
- the information processing apparatus 100 performs carrier sense for transmission while the information processing apparatus 102 is transmitting to the information processing apparatus 201. For example, when the information processing apparatus 100 detects the transmission of the information processing apparatus 102, the transmission is suppressed and the transmission cannot be performed until the transmission of the information processing apparatus 102 ends.
- the desired wave is a radio wave from the information processing apparatus 100 to the information processing apparatus 200, and a radio wave from the information processing apparatus 102 to the information processing apparatus 201.
- the interference wave is a radio wave from the information processing apparatus 100 to the information processing apparatus 201 and a radio wave from the information processing apparatus 102 to the information processing apparatus 200.
- FIG. 4 is a diagram illustrating, in time series, an example of transmission / reception processing performed by each information processing device that configures the communication system 10 according to the first embodiment of the present technology.
- FIG. 4 illustrates an example in which the information processing apparatus 100 transmits to the information processing apparatus 200 while the information processing apparatus 102 transmits to the information processing apparatus 201 in the example illustrated in FIG.
- the information processing apparatus 102 exists in the carrier sense detection range 11 of the information processing apparatus 200. For this reason, when the information processing apparatus 200 first detects transmission (21) of the information processing apparatus 102 and starts reception on the interference side (22), the information processing apparatus 200 newly creates a transmission opportunity. The transmission (23) from the obtained information processing apparatus 100 cannot be received (22). Thus, even if the ratio of the signal wave to the interference wave is sufficiently high, reception may fail.
- the carrier sense detection threshold of the information processing apparatus 200 it is conceivable to increase the carrier sense detection threshold of the information processing apparatus 200.
- the master station since the master station has a plurality of information processing devices under its control and needs to wait at the same time, if the master station uniformly increases the carrier sense detection threshold, communication from the information processing devices under its control should be received May not be detected properly. For this reason, when changing the detection threshold of carrier sense, it is desirable to limit it to, for example, a case where it is really necessary or a case where improvement is surely expected.
- the reception level of transmission / reception packets from a third party can also be set as an observation target.
- the information processing apparatus on the transmission side changes the contents of a PLCP (Physical Layer Convergence Protocol) header according to communication quality (for example, propagation attenuation amount) with a destination.
- PLCP Physical Layer Convergence Protocol
- the information processing apparatus on the receiving side uses a part of the received content of the PLCP header to change the packet detection threshold to be applied so that only desired packets can be detected.
- PLCP is used to transmit a portion that needs to be received in common at a constant rate modulation regardless of the transmission rate, and to transmit the subsequent data portion in various ways depending on the device and the situation at that time. It means a protocol for encapsulating MAC frames.
- the PLCP preamble is used for packet detection and propagation path gain estimation.
- the PLCP header is used to convey information such as modulation of the data part and frame length.
- FIG. 5 is a block diagram illustrating a functional configuration example of the information processing apparatus 100 according to the first embodiment of the present technology. Note that the functional configuration of the information processing apparatuses 101 to 103, 200, and 201 (functional configuration related to wireless communication) is substantially the same as that of the information processing apparatus 100, and thus description thereof is omitted here.
- the information processing apparatus 100 includes a data processing unit 110, a transmission processing unit 120, a modem unit 130, a wireless interface unit 140, an antenna 141, a control unit 150, and a memory 160.
- the data processing unit 110 processes various data based on the control of the control unit 150.
- the data processing unit 110 creates body text such as various data frames and data packets.
- the data processing unit 110 creates various data frames and data packets in response to a request from an upper layer and supplies them to the transmission processing unit 120.
- the data processing unit 110 processes and analyzes various data frames and data packets supplied from the transmission processing unit 120.
- the transmission processing unit 120 performs various transmission processes based on the control of the control unit 150. For example, when performing a transmission operation, the transmission processing unit 120 performs processing such as adding a header for media access control and adding an error detection code to the packet generated by the data processing unit 110. For example, the transmission processing unit 120 performs processing such as adding a MAC header for MAC (Media Access Control Control address) or adding an error detection code to the packet generated by the data processing unit 110. Then, the transmission processing unit 120 supplies the processed data to the modem unit 130.
- processing such as adding a header for media access control and adding an error detection code to the packet generated by the data processing unit 110.
- the transmission processing unit 120 performs processing such as adding a MAC header for MAC (Media Access Control Control address) or adding an error detection code to the packet generated by the data processing unit 110.
- the transmission processing unit 120 supplies the processed data to the modem unit 130.
- the transmission processing unit 120 calculates a NAV (Network Allocation Vector) to be added.
- NAV Network Allocation Vector
- the carrier sense is an example of an arbitration mechanism for avoiding packet collisions.
- the transmission suppression time is described in the contents of the wireless packet, and the transmission suppression is performed on the information processing apparatus that has received the packet. It is to set.
- NAV means the transmission suppression time.
- the transmission processing unit 120 when performing a reception operation, performs processing reverse to that during the transmission operation (for example, packet error detection, MAC header analysis, removal) on the bit string supplied from the modem unit 130. )I do.
- the transmission processing unit 120 confirms that the data frame has no error based on the error detection code, the transmission processing unit 120 supplies various data frames to the data processing unit 110.
- the transmission processing unit 120 performs virtual carrier sense processing. In this case, when the NAV is set in the header of the received packet and transmission suppression is applied, the transmission processing unit 120 notifies the control unit 150 to that effect.
- the modem unit 130 performs modulation / demodulation processing and the like based on the control of the control unit 150. For example, when performing a transmission operation, the modem unit 130 performs encoding, interleaving, modulation, PLCP header on the input bit string from the transmission processing unit 120 based on the coding and modulation scheme set by the control unit 150. , PLCP preamble is added. Then, the modem unit 130 generates a data symbol sequence and supplies it to the wireless interface unit 140.
- the modem unit 130 when performing a reception operation, performs processing opposite to that during the transmission operation on the input from the wireless interface unit 140 and supplies the result to the transmission processing unit 120. Further, the modem unit 130 performs carrier sense processing. In this case, the modem unit 130 determines that the radio is busy when the received power exceeding the threshold value is detected, or when the preamble correlation value equal to or higher than the predetermined output is detected. 150 is notified.
- the wireless interface unit 140 is an interface for connecting to other information processing apparatuses and transmitting / receiving various types of information. For example, when performing a transmission operation, the radio interface unit 140 converts the input from the modem unit 130 into an analog signal, performs amplification, filtering, and frequency up-conversion, and transmits the signal from the antenna 141 as a radio signal. Further, for example, when performing a reception operation, the wireless interface unit 140 performs a process opposite to that during the transmission operation on the input from the antenna 141 and supplies the result to the modem unit 130.
- the control unit 150 controls the reception operation and the transmission operation of each of the data processing unit 110, the transmission processing unit 120, the modem unit 130, and the wireless interface unit 140. For example, the control unit 150 exchanges information between the units, sets communication parameters, and schedules packets in the transmission processing unit 120. For example, when receiving the notification of the carrier sense result from the modem unit 130 and the transmission processing unit 120, the control unit 150 performs each process related to the setting of transmission suppression and the cancellation thereof based on the notification.
- control unit corresponding to the control unit 150 of the information processing apparatus 200 uses a physical header (for example, a PLCP preamble, a PLCP header) used for a packet transmitted by another information processing apparatus using wireless communication. Then, control to transmit to another information processing apparatus is performed.
- a physical header for example, a PLCP preamble, a PLCP header
- control unit 150 performs control to select one of a plurality of physical header candidates (for example, PLCP preamble, PLCP header) and use it for a packet to be transmitted.
- the plurality of physical header candidates correspond to information on a plurality of physical headers (for example, a PLCP preamble and a PLCP header) transmitted from the information processing apparatus 200.
- control unit of the information processing device 200 transmits the packet detection condition (for example, each detection threshold of the PLCP preamble) used by the other information processing device to the other information processing device using wireless communication. Take control.
- packet detection condition for example, each detection threshold of the PLCP preamble
- control unit 150 selects one of a plurality of packet detection conditions (for example, detection threshold values of the PLCP preamble) for a plurality of packets transmitted from the information processing apparatus 200 using wireless communication. Control to use.
- the plurality of packet detection conditions correspond to the plurality of packet detection conditions transmitted from the information processing apparatus 200.
- control unit 150 performs control to select and execute one of a plurality of reception operations for a plurality of packets transmitted from the information processing apparatus 200 using wireless communication.
- a plurality of reception operations will be described in the first to eleventh embodiments of the present technology.
- the memory 160 has a role as a work area for data processing by the control unit 150 and a function as a storage medium for holding various data.
- a storage medium such as a nonvolatile memory, a magnetic disk, an optical disk, or an MO (MagnetoeOptical) disk can be used.
- the nonvolatile memory for example, EEPROM (Electrically Erasable Programmable Read-Only Memory) or EPROM (Erasable Programmable ROM) can be used.
- the magnetic disk for example, a hard disk or a disk type magnetic disk can be used.
- the optical disc for example, a CD (Compact Disc), a DVD-R (Digital Versatile Disc Recordable), or a BD (Blu-Ray Disc (registered trademark) can be used.
- uplink transmission from the information processing apparatus 100 to the information processing apparatus 200 and uplink transmission from the information processing apparatus 102 to the information processing apparatus 201 are performed simultaneously (or substantially simultaneously). An example in which each transmission succeeds when it is performed will be described. Note that the embodiments of the present technology can also be applied to transmissions between information processing apparatuses other than these transmissions.
- FIG. 6 is a sequence chart illustrating an example of communication processing between devices included in the communication system 10 according to the first embodiment of the present technology.
- FIG. 6 shows an example of communication processing when uplink transmission from the information processing apparatus 100 to the information processing apparatus 200 is performed. The same applies to the relationship between other information processing apparatuses (for example, between the information processing apparatus 102 and the information processing apparatus 201).
- connection processing is performed between the information processing apparatus 100 and the information processing apparatus 200 (401).
- the connection process will be described in detail with reference to FIG.
- the information processing apparatus 200 performs physical header parameter determination processing (402).
- the physical header parameter determination process will be described in detail with reference to FIG.
- a physical header parameter sharing process is performed between the information processing apparatus 100 and the information processing apparatus 200 (403).
- a process for sharing the physical header parameter determined by the physical header parameter determination process between the information processing apparatus 100 and the information processing apparatus 200 is performed (403).
- the information processing apparatus 200 performs transmission / reception processing (405).
- the information processing apparatus 100 performs a used physical header determination process (404).
- the used physical header determination process will be described in detail with reference to FIG. Subsequently, the information processing apparatus 100 performs transmission / reception processing (406).
- FIG. 7 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the first embodiment of the present technology.
- the PPDU includes a preamble 301, a SIGNAL 302, an extension 303, a service 304, a MPDU (MAC Protocol Data Unit) 305, and an FCS (Frame Check Sequence) 306.
- Preamble 301 indicates a portion corresponding to IEEE 802.11 L-STF (LegacyegShort Training Field) or L-LTF (Legacy Long Training Field) shown in FIG.
- the preamble 301 is a format compatible with them.
- SINGAL 302 indicates the IEEE802.11 L-SIG (Legacy Signal) and HT-SIG (High ThroughputALSIGNAL) fields shown in FIG.
- FIG. 7C shows an example of IEEE 802.11n HT Mixed Mode Format.
- HT-SIG may be replaced with the VHT-SIG-A (Very High Throughput SIGNAL-A) field in IEEE802.11ac, and the HE-SIG (High Efficiency SIGNAL) field in IEEE802.11ax.
- VHT-SIG-A Very High Throughput SIGNAL-A
- HE-SIG High Efficiency SIGNAL
- HTTP-STF HT-LTF
- VHT-STF HT-LTF
- VHT-SIG-B VHT-SIG-B
- a “Link Strength Category field” is newly prepared in a part of the SIGNAL 302 field that is the PLCP header portion of the physical header. That is, a “Link Strength Category field” is newly provided in a portion of the PLCP header portion that is handled as Reserved in the SIGNAL 302.
- Each information processing device (other than the legacy device) changes “Link Strength Category field” according to the link quality with the destination at the time of transmission.
- FIG. 7 a shows an example in which 1 is stored in “Link Strength Category field”.
- FIG. 7 b illustrates an example in which 0 is stored in “Link Strength Category field”.
- FIGS. 7A and 7B show an example in which two levels (0 or 1) are stored in “Link Strength Category field”, but three or more levels may be stored.
- the “Link Strength Category field” is provided in the portion of the SIGNAL 302 that is reserved. Thereby, the specific function in the first embodiment of the present technology can be realized without preventing reception of the legacy device.
- the information processing apparatus (other than the legacy apparatus) that has received the packet having the Link Strength Category field changes the detection threshold to be applied according to the contents (0 or 1) of the Link Strength Category field.
- FIG. 8 is a sequence chart illustrating an example of a connection process between devices included in the communication system 10 according to the first embodiment of the present technology.
- FIG. 8 shows a processing example until the connection between the information processing apparatus 100 and the information processing apparatus 200 is established. The same applies to the relationship between the information processing apparatus 102 and the information processing apparatus 201.
- the information processing apparatus 100 uses the preamble detection threshold and physical header equivalent to those of the legacy apparatus without adjusting the threshold.
- the information processing apparatus 100 sets the preamble detection threshold value to the same value as the legacy operation (operation of the legacy apparatus) (411). Further, the information processing apparatus 100 sets the physical header in the same format as the legacy operation (operation of the legacy apparatus) (412).
- the information processing apparatus 200 sets the physical header in the same format as the legacy operation (legacy apparatus operation) (413).
- a scan is performed (414), an authentication is performed (415), an association is performed (416), and a 4-way Handshake is performed (417).
- the control unit of the information processing device 200 uses the setting information used by each information processing device (for example, the information processing device (subordinate terminal) connected to the information processing device 200).
- List (setting information list) is generated.
- This setting information list is a list including combinations of detection threshold values of physical headers used by information processing apparatuses and application levels (application conditions) of physical headers. The setting information list will be described in detail with reference to FIG.
- a set of a physical header detection threshold and a physical header application level is referred to as a physical header parameter.
- the information processing apparatus 200 updates the content of information already created among the pieces of information included in the setting information list.
- FIG. 9 is a diagram schematically illustrating an example of the content of the setting information list 161 stored in the memory (corresponding to the memory 160 illustrated in FIG. 5) of the information processing device 200 according to the first embodiment of the present technology. .
- an index 162 In the setting information list 161, an index 162, a detection threshold 163, and an application level 164 are stored in association with each other.
- the index 162 stores a value (0, 1) indicating far / near.
- the detection threshold value 163 stores a physical header detection threshold value determined by the physical header parameter determination process.
- the physical header parameter determination process is shown in FIG.
- the application level 164 stores the application level of the physical header determined by the physical header parameter determination process.
- FIG. 10 is a flowchart illustrating an example of a processing procedure of physical header parameter determination processing by the information processing device 200 according to the first embodiment of the present technology.
- control unit of the information processing apparatus 200 provisionally decides the physical header parameters used by the subordinate terminal in the own BSS (Basic Service Set) and the own apparatus.
- the control unit of the information processing apparatus 200 provisionally determines the detection threshold value PD_near for the short-distance physical header and the detection threshold value PD_far for the long-distance physical header.
- the detection threshold PD_far of the long-distance physical header is temporarily set to the legacy device setting value PD_default because there is no physical header of the application condition lower than that.
- This legacy device setting value PD_default is a value representing a reference level for preamble detection used by the legacy device.
- a value of -82 dBm per 20 MHz bandwidth is referred to as a standard value.
- a value other than ⁇ 82 dBm may be used as the legacy device setting value PD_default.
- the control unit of the information processing device 200 determines application levels L_near and L_far for each physical header based on the detection threshold value PD_near for the short-distance physical header and the detection threshold value PD_far for the long-distance physical header. Specifically, the control unit of the information processing device 200 determines the application levels L_near and L_far of each physical header so as to satisfy the following expressions 1 and 2.
- the application levels L_near and L_far of each physical header are thresholds for selecting a physical header to be used (long-distance physical header, short-distance physical header) based on the communication quality with the destination device. For example, when the information processing apparatus 100 performs transmission, application levels L_near and L_far of each physical header are used as thresholds when selecting a physical header to be used based on the communication quality with the destination apparatus.
- O_near is a margin offset amount for a preamble detection error due to a change in reception level.
- O_near a value of about 10 to 20 dBm can be used as O_near.
- a value other than 10 to 20 dBm may be used as O_near.
- L_far is set to infinitely small because there is no physical header with application conditions lower than this.
- control unit of the information processing apparatus 200 performs packet monitoring (step S701). And the control part of the information processing apparatus 200 acquires each information regarding the communication quality with each subordinate information processing apparatus in own BSS, and the communication quality of the packet from other BSS (OBSS) (step S701).
- OBSS BSS
- the correlation output strength of the PLCP preamble is used as an indicator of communication quality.
- This correlation output intensity is not a correlator output itself with normalized power, but indicates an absolute level obtained by multiplying the correlator output by a received signal power intensity (RSSI (Received Signal Strength Indicator)). That is, the correlation output intensity means a correlator output corrected to antenna input conversion. If there is a reception history at a relatively short time, the correlation output intensity record at that time may be used. Further, when monitoring, the detection threshold may be temporarily lowered so that samples can be collected more reliably.
- RSSI Receiveived Signal Strength Indicator
- FIG. 11 shows a configuration example of the correlator.
- FIG. 11 is a diagram illustrating a configuration example of a correlator provided in the information processing device 200 according to the first embodiment of the present technology.
- the structural example of the general correlator used as a reference is shown.
- the operator (*) shown in FIG. 11 indicates a complex conjugate operation.
- correlators there are generally two types of correlators according to the characteristics of the preamble. For example, there are two configurations: an autocorrelation detection configuration that generally detects a signal having a certain periodicity, and a crosscorrelation detection configuration that detects a correlation with a predetermined pattern.
- 11a shows an example of the configuration of autocorrelation detection
- FIG. 11b shows an example of the configuration of cross-correlation detection.
- control unit of the information processing device 200 classifies the communication quality information according to “Link Strength Category field” in the physical header used when the information is received (step S702).
- control unit of the information processing device 200 sets the minimum correlation output intensity to COL_self_far among the packets whose BSS identifier (BSSID) is the own BSS, the physical header is the long-distance physical header, and is not an error. .
- BSSID BSS identifier
- control unit of the information processing device 200 sets the maximum correlation output strength to COL_other_near among the packets whose BSS identifier (BSSID) is another BSS, the physical header is a short-distance physical header, and is not an error. .
- BSSID BSS identifier
- control unit of the information processing device 200 sets the maximum correlation output strength to COL_other_far among the packets whose BSS identifier (BSSID) is another BSS, the physical header is a long-distance physical header, and is not an error. .
- BSSID BSS identifier
- COL for which there is no packet sample of the corresponding condition is replaced with PD_default.
- the control unit of the information processing device 200 determines a detection threshold value PD_near for the short-distance physical header and a detection threshold value PD_far for the long-distance physical header (step S703).
- the control unit of the information processing device 200 establishes the following relations of Expression 3 to Expression 5 for the detection threshold value PD_near for the short-distance physical header and the detection threshold value PD_far for the long-distance physical header. (Step S703).
- control unit of the information processing device 200 corrects the application levels L_near and L_far of each physical header based on the above-described Expression 1 and Expression 2. (Step S703).
- the detection threshold value PD_near for the short-distance physical header, the detection threshold value PD_far for the long-distance physical header, and the application levels L_near and L_far for each physical header are determined.
- the control unit of the information processing apparatus 200 stores each value thus determined in the setting information list 161 (shown in FIG. 9), and refers to the value and uses it thereafter. Specifically, the control unit of the information processing device 200 stores PD_far in the detection threshold 163 corresponding to the index 162 “0”, and stores L_far in the application level 164 corresponding to the index 162 “0”. In addition, the control unit of the information processing device 200 stores PD_near in the detection threshold 163 corresponding to the index 162 “1”, and stores L_near in the application level 164 corresponding to the index 162 “1”.
- the monitoring of surrounding packets and the updating of each set value described above may be performed regularly or irregularly. For example, it may be performed periodically every fixed time or may be performed each time a connection of a new subordinate terminal is started.
- Example of carrier sense detection range 12 and 13 are diagrams illustrating a system configuration example of the communication system 10 according to the first embodiment of the present technology.
- An example is shown.
- the carrier sense detection ranges 31 to 34 of the information processing apparatuses 100 and 102 are schematically shown by dotted circles.
- the carrier sense detection ranges 41 to 44 of the information processing apparatuses 200 and 201 are schematically shown by dotted circles.
- a carrier sense detection range 31 indicates a carrier sense detection range of the information processing apparatus 100 set based on the detection threshold value PD_far of the long-distance physical header.
- the carrier sense detection range 33 indicates the carrier sense detection range of the information processing apparatus 100 set based on the detection threshold value PD_near of the short-distance physical header.
- a carrier sense detection range 32 indicates the carrier sense detection range of the information processing apparatus 102 set based on the detection threshold value PD_far of the long-distance physical header.
- the carrier sense detection range 34 indicates the carrier sense detection range of the information processing apparatus 102 set based on the detection threshold value PD_near of the short-distance physical header.
- a carrier sense detection range 41 indicates a carrier sense detection range of the information processing apparatus 200 set based on the detection threshold value PD_far of the long-distance physical header.
- the carrier sense detection range 43 indicates a carrier sense detection range of the information processing apparatus 200 set based on the detection threshold value PD_near of the short-distance physical header.
- a carrier sense detection range 42 indicates the carrier sense detection range of the information processing apparatus 201 set based on the detection threshold value PD_far of the long-distance physical header.
- the carrier sense detection range 44 indicates the carrier sense detection range of the information processing apparatus 201 set based on the detection threshold value PD_near of the short-distance physical header.
- the classification may be a classification of three or more values (N value).
- N value the number of values (N value).
- the detection threshold of each physical header is PD_0, PD_1,..., PD_N
- the application level of each PLCP is L_0, L_1,.
- the offset between the detection threshold of each physical header and the application level of each physical header is O_0, O_1,..., O_N.
- each value is determined so as to satisfy the following relational expressions (Expressions 6 to 9).
- Expressions 6 to 9 are descriptions assuming calculation in logarithm (dB).
- the PD_0 is determined with priority given to the establishment of the expression 7.
- FIG. 14 is a diagram illustrating an example of a beacon frame format exchanged between devices included in the communication system 10 according to the first embodiment of the present technology. Here, an example of a beacon frame transmitted from the information processing apparatus 200 to another information processing apparatus is shown.
- FIG. 14 shows an example in which an element “Multi Detect Parameter” 311 is newly added to Payload 310. Then, in “Multi Detect Parameter” 311, an index (0/1) indicating far / near is stored in “PLCP Header Index” 313 and 316.
- the “Preamble Detection Threshold” 314 and 317 store the detection threshold value PD_far of the long-distance physical header and the detection threshold value PD_near of the short-distance physical header.
- “Apply Level” 315 and 318 store the application level of each physical header.
- each combination of “PLCP Header Index”, “Preamble Detection Threshold”, and “Apply Level” is provided only for the generated combination.
- PLCP Header Index two sets of information (two sets of indexes 162 “0” and “1”) are stored in the setting information list 161.
- only two combinations of “PLCP Header Index”, “Preamble Detection Threshold”, and “Apply Level” are provided.
- the control unit of the information processing device 200 stores each content of the setting information list 161 illustrated in FIG. 9 in a beacon frame and transmits it. That is, the control unit of the information processing device 200 stores each piece of information stored in association with the index 162 “0” in the first combination (“PLCP Header Index” 313 to “Apply Level” 315). Further, the control unit of the information processing device 200 stores each piece of information stored in association with the index 162 “1” in the following combinations (“PLCP Header Index” 316 to “Apply Level” 318).
- the control unit of the information processing device 200 transmits a beacon in which each piece of information indicated in “Multi Detect Parameter” 311 is stored to the surrounding information processing devices to notify them. That is, the control unit of the information processing device 200 includes information on the packet detection condition (for example, the packet detection threshold (the detection threshold 163 shown in FIG. 9), the selection condition for selecting this (application level 164 shown in FIG. 9)) Is transmitted to the surrounding information processing apparatus for notification.
- the selection condition can be grasped as a selection condition for selecting one from a plurality of physical header candidates and a selection condition for a physical header corresponding to each packet detection condition.
- FIG. 15 is a sequence chart illustrating an example of a physical header parameter sharing process between the devices included in the communication system 10 according to the first embodiment of the present technology.
- FIG. 15 illustrates a sharing process example in which the control unit 150 of the information processing apparatus 100 receives the beacon transmitted from the information processing apparatus 200 and shares the physical header parameter.
- the control unit of the information processing apparatus 200 can notify the subordinate terminal of the physical header parameter using the beacon frame shown in FIG.
- the control unit of the information processing device 200 stores a set of a detection threshold of each physical header, an application level of each physical header, and an index of each physical header in a beacon (421). Then, the control unit of the information processing device 200 transmits the beacon to the subordinate information processing device (422, 423).
- the control unit 150 of the information processing device 100 displays the contents of “Multi Detect Parameter” 311 (shown in FIG. 14) included in the beacon. Obtain and hold (424).
- the control unit 150 of the information processing apparatus 100 adopts and holds the new information after the change. That is, old information is updated.
- the control unit 150 of the information processing apparatus 100 updates the held content based on the newly received beacon. (424).
- FIG. 15 shows an example in which the control unit of the information processing device 200 notifies a physical header parameter to each information processing device by a beacon
- the physical header parameter may be notified by other than a beacon.
- the control unit of the information processing device 200 may notify the subordinate terminal with a unicast data frame or a management frame, triggered by a determination by the own device or an information acquisition request from the subordinate terminal. .
- the control unit 150 of the information processing apparatus 100 similarly acquires and holds the contents of “Multi Detect Parameter” included in the unicast frame.
- FIG. 16 is a flowchart illustrating an example of a processing procedure of used physical header determination processing (transmission physical header selection processing) performed by the information processing apparatus 100 according to the first embodiment of the present technology.
- the control unit 150 of the information processing apparatus 100 monitors received packets from destinations connected to the information processing apparatus 100, and acquires RSSI for each destination (step S711).
- the RSSI (monitor result) acquired in this way is defined as RSSI_peer.
- the control unit 150 of the information processing apparatus 100 reads the measurement value and acquires the RSSI for each destination. (Step S711).
- the destination is basically only the parent station.
- a past beacon reception level may be used as a monitoring result.
- the control unit 150 of the information processing apparatus 100 compares the acquired RSSI_peer with the application level L_near of the physical header, and determines the physical header index used by the own apparatus for transmission based on the comparison result. (Step S712).
- the application level L_near of the physical header is included in the beacon transmitted from the information processing apparatus 200.
- the control unit 150 of the information processing apparatus 100 sets the index of the physical header used by the own apparatus to 1 (for short distance). Determine (step S712).
- the control unit 150 of the information processing apparatus 100 determines that the index of the physical header used for transmission by the own apparatus is 0 (for long distance). (Step S712).
- Step S712 when the index of the physical header used by the own device has already been determined and a new index is determined, the already determined index is updated to the new index (Ste S712).
- FIG. 16 shows an example in which the used physical header is determined based on the short-range and long-range binary classification
- the used physical header is determined based on the classification of three or more values (N value). It may be.
- the application level of each PLCP is set to L_0, L_1,.
- n satisfying the following relational expression (Expression 10) is selected as an index of a physical header used for transmission.
- Expression 10 is a description that assumes calculation in logarithm (dB).
- n 0 to N.
- FIG. 16 an example of operation on the slave station side in the case of uplink transmission from the slave station side to the master station side has been described. However, in the case of downlink transmission, the same operation is performed on the master station side. It may be.
- a correlation output intensity COL may be used instead of RSSI.
- FIG. 17 is a flowchart illustrating an example of a processing procedure of transmission / reception processing by the information processing device 100 according to the first embodiment of the present technology.
- FIG. 17 demonstrates the information processing apparatus 100, it is applicable similarly about another information processing apparatus (for example, information processing apparatus 200). That is, this transmission / reception processing is equivalent to both the master station side and the terminal side.
- the control unit 150 of the information processing apparatus 100 performs a packet detection determination process for a time other than during transmission and reception (step S730). This packet detection determination process will be described in detail with reference to FIG.
- the control unit 150 of the information processing apparatus 100 determines whether or not the determination result by the packet detection determination process is “detection” (step S721).
- the determination result by the packet detection determination process is “detection” (step S721)
- the control unit 150 of the information processing apparatus 100 performs a reception process to continue reception (step S722). Then, the control unit 150 of the information processing apparatus 100 returns to the standby state after the reception is completed.
- the control unit 150 of the information processing device 100 adds a physical header having the same “Link Strength Category” field as the target packet. Then send. That is, the information stored in the SIGNAL field is stored in the same part, and information determined by the own apparatus is stored in the other parts (for example, MCS (Modulation and Coding Scheme), length).
- MCS Modulation and Coding Scheme
- step S721 the determination result by the packet detection determination process is not “detection” (step S721), the control unit 150 of the information processing apparatus 100 determines whether the determination result by the packet detection determination process is “non-detection”. (Step S723).
- the control unit 150 of the information processing apparatus 100 determines whether there is a packet to be transmitted (step S724).
- the control unit 150 of the information processing apparatus 100 determines that the non-detection determination state is a frame interval (IFS (InterFS) defined by a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) procedure Frame Space)) and whether or not the duration is longer than the back-off time (step S725).
- IFS InterFS
- CSMA / CA Carrier Sense Multiple Access with Collision Avoidance
- control unit 150 of the information processing apparatus 100 can perform transmission, and thus performs transmission processing (step S726).
- the control unit 150 of the information processing apparatus 100 for example, converts the physical header of the PPDU format illustrated in FIG. 7 based on the physical header index determined by the transmission physical header determination process illustrated in FIG. Use to send.
- control unit 150 of the information processing apparatus 100 stores 1 in “Link Strength Category field” when 1 (for short distance) is determined as an index by the transmission physical header determination process. Transmit (step S726).
- control unit 150 of the information processing apparatus 100 stores 0 in the “Link Strength Category field” and transmits (0) Step S726).
- control unit 150 of the information processing device 100 may, for example, perform modulation and communication channels that can be received with high probability by the destination device according to the detection threshold corresponding to the determined physical header. Select the encoding method and transmit using it. Further, the control unit 150 of the information processing apparatus 100, for example, in accordance with a detection threshold corresponding to the determined physical header, a modulation and channel coding scheme (MCS (Modulation) that the destination apparatus can receive with high probability. and Coding Scheme)) may be selected and transmitted. When there are no more packets to be transmitted, the standby state is restored.
- MCS Modulation
- Coding Scheme Coding Scheme
- the control unit 150 of the information processing apparatus 100 When the determination result by the packet detection determination process is not “non-detection” (when the determination result is “detect only energy”) (step S723), the control unit 150 of the information processing apparatus 100 basically sets the wireless state to busy. It is treated as a state, and transmission from its own device is suppressed (step S727). However, only when a packet addressed to itself is received and a response immediately after the reception is requested (step S728), the control unit 150 of the information processing apparatus 100 transmits the response packet (step S729).
- FIG. 18 is a flowchart illustrating a packet detection determination process (the processing procedure of step S730 illustrated in FIG. 17) in the transmission / reception process performed by the information processing apparatus 100 according to the first embodiment of the present technology.
- control unit 150 of the information processing apparatus 100 performs RSSI measurement on a signal input via the antenna 141, and holds the RSSI obtained by the measurement (step S731).
- the control unit 150 of the information processing apparatus 100 performs correlation calculation of the preamble pattern to obtain a correlator output (step S732).
- This correlator output means the correlation output intensity COL described above. That is, the correlator output is not a normalized correlator output level but a correlator output converted to reflect the received power.
- the control unit 150 of the information processing apparatus 100 compares the correlator output value with the temporary detection threshold value, and determines whether or not the correlator output value exceeds the temporary detection threshold value (step S733).
- provisional detection is detection for determining whether or not to read the SINGAL field prior to detection determination.
- the provisional detection threshold is set to a value that is less than or equal to both PD_near and PD_far. Note that the temporary detection threshold may be the PD_default described above.
- step S733 When the correlator output value exceeds the temporary detection threshold (step S733), the control unit 150 of the information processing apparatus 100 determines that the temporary detection state is set (step S734). Subsequently, the control unit 150 of the information processing apparatus 100 reads “Link Strength Category field” in the subsequent SIGNAL field in the physical header. As described above, “Link Strength Category field” stores information indicating a detection threshold to be applied.
- control unit 150 of the information processing apparatus 100 holds the content of “Preamble Detection Threshold” shared in the physical header parameter sharing process shown in FIG.
- the control unit 150 of the information processing apparatus 100 determines a detection threshold (application detection threshold) to be applied based on the content of “Preamble Detection Threshold” and the content of “Link Strength Category field” (step S735). .
- the control unit 150 of the information processing apparatus 100 determines the application detection threshold as PD_far.
- the control unit 150 of the information processing apparatus 100 determines the application detection threshold as PD_near. Then, the control unit 150 of the information processing apparatus 100 uses the determined application detection threshold (PD_far or PD_near) when performing transmission / reception processing.
- the control unit 150 of the information processing apparatus 100 compares the RSSI measured and held with the determined application detection threshold, and whether the RSSI exceeds the application detection threshold (PD_far or PD_near). It is determined whether or not (step S736).
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detection” (step S737).
- the packet detection determination result may be “detected” only when other conditions are satisfied.
- an error detection code including “Link Strength Category field” may be provided in the remaining Reserved field in the SIGNAL field. Then, a condition that the validity of the contents of “Link Strength Category field” is confirmed by an error detection code including “Link Strength Category field” as an object may be set as an additional determination condition.
- an error detection code including “Link Strength Category field” as a target may be inserted into the remaining Reserved field in the Service field. Then, a condition that the validity of the contents of “Link Strength Category field” is confirmed by an error detection code including “Link Strength Category field” as an object may be set as an additional determination condition.
- the control unit 150 of the information processing apparatus 100 stops the reception (step S738). Subsequently, the control unit 150 of the information processing apparatus 100 compares the RSSI with the energy detection threshold ED, and determines whether the RSSI exceeds the energy detection threshold ED (step S739).
- the energy detection threshold ED can be set to ⁇ 62 dBm per 20 MHz bandwidth, for example.
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detect only energy” (step S740).
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “non-detection” (step S741).
- the correlation output intensity COL described above may be used instead of the RSSI.
- the master station and the slave station can perform transmission / reception at the same time (or substantially simultaneously), and can reuse radio resources.
- a slave station for example, the information processing apparatus 100
- the master station for example, the information processing apparatus 200
- the slave station on the OBSS side for example, information processing
- device 102 starts transmitting.
- the control unit 150 of the information processing apparatus 100 performs detection determination according to the physical header using the physical header detection threshold value PD_near or PD_far. For example, as shown in FIG. 12, carrier sense detection ranges 31 and 33 of the information processing apparatus 100 are set. Thereby, even if the information processing apparatus 102 is transmitting, the control unit 150 of the information processing apparatus 100 can treat the signal as non-detection and can transmit the signal to the information processing apparatus 200.
- the information processing apparatus 200 does not detect the transmission of the information processing apparatus 102 and can therefore wait for reception from the information processing apparatus 100.
- the information processing apparatus 200 uniformly increases the detection threshold, there is a possibility that the packet from the information processing apparatus 101 cannot be detected. Accordingly, since transmission from the information processing apparatus 101 (legacy apparatus) located at a long distance is detected as a long-distance physical header, a detection threshold for long distance is applied. Thereby, the information processing apparatus 200 can accept reception from each information processing apparatus without delay.
- the “detection threshold” in the first embodiment of the present technology may be the detection threshold of the L-STF unit.
- the detection threshold value of the L-STF unit instead of the detection threshold value of the L-STF unit, the detection threshold value of the L-LTF unit may be used, or the detection threshold value common to both the L-STF unit and the L-LTF unit may be used. Good.
- the detection threshold values of the L-STF part and the L-LTF part may be changed independently, and it may be extended so that both are specified as physical header parameters.
- the physical header parameter of the own apparatus may be determined based on the capability that can be used by another information processing apparatus.
- Second Embodiment> In the first embodiment of the present technology, even when the packet detection determination result is “energy only detection” and transmission suppression is set, an example of temporarily canceling the transmission suppression has been described. In other words, even if transmission suppression is set, the response packet is transmitted only when a packet addressed to its own device is received and a response immediately after the reception is requested. An example to do.
- the configuration of the information processing apparatus according to the second embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- each process and each format in the second embodiment of the present technology also have parts in common with the first embodiment of the present technology. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 19 is a flowchart illustrating an example of a processing procedure of transmission / reception processing by the information processing device 100 according to the second embodiment of the present technology. Note that FIG. 19 is a modification of part of the transmission / reception processing shown in FIG. For this reason, portions common to the transmission / reception processing shown in FIG. 17 are assigned the same reference numerals as those in FIG.
- the control unit 150 of the information processing apparatus 100 basically treats the wireless state as the busy state and suppresses transmission from the own apparatus. (Step S727).
- the wireless state is handled as a busy state in this way, in the second embodiment of the present technology, it is assumed that all transmissions are suppressed.
- the configuration of the information processing apparatus according to the third embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- each process and each format in the third embodiment of the present technology also have parts in common with the first embodiment of the present technology. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 20 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the third embodiment of the present technology.
- the example shown in FIG. 20 is the same as the example shown in FIG. 7 except that the Link Strength Category field is provided in the Service field instead of being provided in the SIGNAL field. 7 are denoted by the same reference numerals as those in FIG. 7, and a part of the description is omitted.
- the PPDU includes a preamble 301, a SIGNAL 307, an extension 303, a service 308, an MPDU 305, and an FCS 306.
- a “Link Strength Category field” is newly prepared in a part of the Service 308 field of the physical header. That is, a “Link Strength Category field” is newly provided in a portion of the physical header that is handled as Reserved in the Service 308.
- Each information processing device (other than the legacy device) changes “Link Strength Category field” according to the link quality with the destination at the time of transmission.
- “Link Strength Category field” is provided in a portion of the Service 308 that is treated as Reserved.
- an error detection code including “Link Strength Category field” as a target may be inserted into the remaining Reserved field in the Service field. Then, a condition that the validity of the contents of “Link Strength Category field” is confirmed by an error detection code including “Link Strength Category field” as an object may be set as an additional determination condition.
- the Link Strength Category field is provided in the Service field of the IEEE 802.11 standard.
- more information can be stored as compared to the first embodiment of the present technology. For example, even when the PLCP mode is multivalued, the information can be stored appropriately.
- the fourth embodiment of the present technology an example is shown in which a plurality of preamble sequences having different detection thresholds are used on the transmission side, and the reception side switches the preamble correlation detector applied by RSSI. Thereby, the receiving side can receive only a desired packet.
- the configuration of the information processing apparatus according to the fourth embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- each process and each format in the fourth embodiment of the present technology also have parts in common with the first embodiment of the present technology. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 21 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the fourth embodiment of the present technology.
- FIG. 21 is the same as the example shown in FIG. 7 except that a plurality of preamble sequences are defined instead of providing a link strength category field in the SIGNAL field. 7 are denoted by the same reference numerals as those in FIG. 7, and a part of the description is omitted.
- the PPDU includes a preamble 311, a SIGNAL 312, an extension 303, a service 304, an MPDU 305, and an FCS 306.
- a plurality of preamble 311 sequences are defined. For example, as shown in a of FIG. 21, a sequence “Preamble # 1” is defined in the preamble 311. Further, as shown in FIG. 21b, a series “Preamble # 0” is defined.
- Each information processing device (other than the legacy device) changes the sequence to be used according to the quality of the link with the destination at the time of transmission.
- FIG. 21 shows an example in which two types of preambles are prepared, but three or more types of preambles may be prepared.
- a physical header using a sequence “Preamble # 0” for the preamble 311 is referred to as a “long-distance physical header”.
- a physical header using a sequence “Preamble # 1” for the preamble 311 is referred to as a “short-distance physical header”.
- Each Preamble sequence is generated according to different rules and has a low cross-correlation.
- the preamble sequence # 0 is the same sequence as the preamble used by the legacy apparatus.
- Each information processing device (other than the legacy device) that has received a packet having such a physical header changes the correlator to be applied (and the threshold value for determining detection) according to the magnitude of the RSSI of the signal.
- another preamble means that at least one of L-STF and L-LTF is different.
- FIG. 22 is a flowchart illustrating a packet detection determination process (the process procedure of step S730 illustrated in FIG. 17) in the transmission / reception process performed by the information processing apparatus 100 according to the fourth embodiment of the present technology.
- control unit 150 of the information processing apparatus 100 performs RSSI measurement on a signal input via the antenna 141, and holds the RSSI obtained by the measurement (step S751).
- control unit 150 of the information processing apparatus 100 compares the measured RSSI with the applied levels (L_far and L_near) of each physical header to determine the index of the physical header to be applied to detection. (Step S752).
- the index of the physical header applied to detection can be determined in the same manner as the selection method for selecting the transmission physical header of the own apparatus.
- control unit 150 of the information processing apparatus 100 compares the measured RSSI with the value of L_near, and when the measured RSSI exceeds L_near, the physical header used for correlation detection of the own apparatus Is determined to be 1 (for short distance). In addition, when the measured RSSI is equal to or less than L_near, the control unit 150 of the information processing apparatus 100 determines that the index of the physical header used for correlation detection of the own apparatus is 0 (for long distance).
- this determination procedure assumes that there is no difference in transmission power between the slave station and the master station. However, even if there is a difference in transmission power between the slave station and the parent station, if the information on the difference in transmission power is held in advance, the information is appropriately changed based on the held information on the difference in transmission power. The determination can be made after correction.
- the control unit 150 of the information processing apparatus 100 performs correlation calculation using a correlator corresponding to the preamble sequence generated according to different rules as described above, in the physical header of the determined index (step S753).
- the correlator output means the correlation output intensity COL, as in the first embodiment of the present technology. That is, the correlator output is not a normalized correlator output level but a correlator output converted to reflect the received power.
- control unit 150 of the information processing apparatus 100 compares the correlator output of the selected correlator with the detection threshold value of the physical header at the determined index, and the value of the correlator output indicates the detection threshold value. It is determined whether or not it exceeds (step S754).
- step S754 If the correlator output value exceeds the detection threshold (step S754), the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detection” (step S755).
- the control unit 150 of the information processing apparatus 100 compares the measured RSSI with the energy detection threshold ED (step S756). . Then, the control unit 150 of the information processing apparatus 100 determines whether or not the RSSI exceeds the energy detection threshold ED (step S756).
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detect only energy” (step S757).
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “non-detection” (step S758).
- the “detection threshold” in the fourth embodiment of the present technology may be the detection threshold of the L-STF unit.
- the detection threshold value of the L-STF unit instead of the detection threshold value of the L-STF unit, the detection threshold value of the L-LTF unit may be used, or the detection threshold value common to both the L-STF unit and the L-LTF unit may be used. Good.
- the detection threshold values of the L-STF part and the L-LTF part may be changed independently, and it may be extended so that both are specified as physical header parameters.
- the fifth embodiment of the present technology is a modification of the fourth embodiment of the present technology, and illustrates an example in which the master station side selects a physical header used by a subordinate information processing apparatus. Further, the receiving side shows an example in which the candidate preamble sequence correlators are always operated in parallel.
- the configuration of the information processing apparatus in the fifth embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG. For this reason, portions common to the first to fourth embodiments of the present technology are denoted by the same reference numerals as those of the first to fourth embodiments of the present technology, and a part of these descriptions is omitted. To do.
- each process and each format in the fifth embodiment of the present technology also have parts in common with the first to fourth embodiments of the present technology. For this reason, portions common to the first to fourth embodiments of the present technology are denoted by the same reference numerals as those of the first to fourth embodiments of the present technology, and a part of these descriptions is omitted. To do.
- FIG. 23 is a diagram illustrating an example of a beacon frame format exchanged between devices included in the communication system 10 according to the fifth embodiment of the present technology. Since FIG. 23 is a modification of FIG. 14, portions common to FIG. 14 are denoted by the same reference numerals as those in FIG.
- FIG. 23 shows an example in which an element “Multi Detect Assignment” 321 is newly added to Payload 320 together with “Multi Detect Parameter” 311.
- “Association ID” 323 and 325 stores information for specifying a subordinate information processing apparatus.
- FIG. 23 shows an example in which the Association ID is stored as information for specifying the information processing apparatus, but other information that can specify the information processing apparatus may be stored.
- the MAC address may be stored.
- the physical header index (0 or 1) used by the information processing apparatus is stored in “PLCP Header Index” 324 and 326. These combinations are stored side by side for all of the information processing apparatuses under the control (except for the legacy apparatus).
- control unit of the information processing device 200 transmits a beacon in which each piece of information shown in “Multi Detect Parameter” 311 and “Multi Detect Assignment” 321 is stored to the surrounding information processing devices to notify them.
- FIG. 24 is a sequence chart illustrating a connection processing example between devices included in the communication system 10 according to the fifth embodiment of the present technology.
- FIG. 24 is a modification of FIG. 15, and thus a part of the description of the parts common to FIG. 15 is omitted. That is, FIG. 24 shows an example in which a physical header parameter itself is included in a beacon and transmitted, and information for designating a physical header to be used by each subordinate information processing apparatus is included in the beacon.
- control unit of the information processing device 200 sets a set of a detection threshold of each physical header, an application level of each physical header, and an index of each physical header as a “Multi Detect Parameter” 311 of a beacon (shown in FIG. 23). (431).
- control unit of the information processing device 200 stores a set of information for designating a physical header used by each information processing device under its control in the “Multi Detect Assignment” 321 (shown in FIG. 23) of the beacon (432). ).
- the control unit of the information processing device 200 stores only the corresponding preamble sequence after confirming whether it supports the generation function of the preamble sequence specified by the capability of each subordinate information processing device and the correlation detection function. It shall be. Further, when selecting a physical header used by each subordinate information processing apparatus corresponding to a specific function, the determination is made using information on the link quality between the master station and each subordinate station. For this purpose, a received packet from a destination connected to the own apparatus is monitored (or a stored measurement value is read), and RSSI for each destination is acquired and used. Note that the correlation output intensity COL described above may be used instead of RSSI.
- control unit of the information processing device 200 transmits the beacon to the subordinate information processing device (433, 434).
- the control unit 150 of the information processing apparatus 100 When receiving the beacon from the information processing apparatus 200 (434), the control unit 150 of the information processing apparatus 100 acquires and holds each content included in the beacon (435). That is, the control unit 150 of the information processing apparatus 100 acquires and holds the contents of “Multi Detect Parameter” 311 and “Multi Detect Assignment” 321 (shown in FIG. 23) included in the beacon (435).
- control part 150 of the information processing apparatus 100 uses a corresponding physical header according to the index of the physical header designated by the beacon by the master station (information processing apparatus 200). That is, the control unit 150 of the information processing apparatus 100 does not make an autonomous determination.
- FIG. 25 is a flowchart illustrating a packet detection determination process (the processing procedure of step S730 illustrated in FIG. 17) in the transmission / reception process performed by the information processing apparatus 100 according to the fifth embodiment of the present technology.
- FIG. 25 shows an example in which each master station and each slave station corresponding to a specific function operate all of the PLCP Preamble correlators supported by the own device in parallel.
- control unit 150 of the information processing apparatus 100 measures RSSI with respect to a signal input via the antenna 141, and holds the RSSI obtained by the measurement (step S761).
- control unit 150 of the information processing apparatus 100 inputs an input signal to each correlator and performs correlation calculation (step S762). That is, the control unit 150 of the information processing apparatus 100 calculates the correlation of the preambles simultaneously in each correlator (step S762).
- each detection threshold value for determining detection based on each correlator output uses each physical header detection threshold value designated by the master station in the physical header parameter sharing process.
- the correlator output means the correlation output intensity COL, as in the first embodiment of the present technology. That is, the correlator output is not a normalized correlator output level but a correlator output converted to reflect the received power.
- control unit 150 of the information processing apparatus 100 determines whether any one of the plurality of correlators exceeds a corresponding detection threshold (step S763).
- step S763 When the correlator output of any of the plurality of correlators exceeds the corresponding detection threshold (step S763), the control unit 150 of the information processing apparatus 100 sets the packet detection determination result as “detection”. (Step S764).
- step S763 When all the correlator outputs of the plurality of correlators do not exceed the corresponding detection threshold (step S763), the control unit 150 of the information processing apparatus 100 determines the measured RSSI and the energy detection threshold. ED is compared (step S765). Then, the control unit 150 of the information processing apparatus 100 determines whether or not the RSSI exceeds the energy detection threshold value ED (step S765).
- step S765 If the RSSI exceeds the energy detection threshold ED (step S765), the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detect only energy” (step S766).
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “non-detection” (step S767).
- the sixth embodiment of the present technology is a modification of the fourth embodiment of the present technology, and the generation of a plurality of PLCP preambles for distinction is performed by using the original sequence instead of a complete separate sequence.
- An example of partial processing and generation is shown. Thereby, the structure of the several correlator on the receiving side can be simplified.
- the processing source preamble sequence is a legacy device format sequence
- an information processing device that does not support a specific function can detect the preamble depending on the conditions, and it is possible to retain some backward compatibility. It becomes.
- the configuration of the information processing apparatus in the sixth embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG. For this reason, portions common to the first to fourth embodiments of the present technology are denoted by the same reference numerals as those of the first to fourth embodiments of the present technology, and a part of these descriptions is omitted. To do.
- each process and each format in the sixth embodiment of the present technology also have parts in common with the first to fourth embodiments of the present technology. For this reason, portions common to the first to fourth embodiments of the present technology are denoted by the same reference numerals as those of the first to fourth embodiments of the present technology, and a part of these descriptions is omitted. To do.
- PPDU format example The format of the PPDU in the sixth embodiment of the present technology is the same as the example shown in FIG.
- a plurality of preambles 311 are defined.
- a sequence “Preamble # 1” is defined in the preamble 311.
- a series “Preamble # 0” is defined.
- Each information processing device (other than the legacy device) changes the sequence to be used according to the quality of the link with the destination at the time of transmission.
- FIG. 21 shows an example in which two types of preambles are prepared, but three or more types of preambles may be prepared.
- a physical header using a sequence “Preamble # 0” for the preamble 311 is referred to as a “long-distance physical header”.
- a physical header using a sequence “Preamble # 1” for the preamble 311 is referred to as a “short-distance physical header”.
- the preamble sequence # 0 is the same sequence as the preamble used by the legacy apparatus.
- the sixth embodiment of the present technology differs from the fourth embodiment of the present technology in the generation method of the preamble sequence other than the preamble # 0.
- a series other than the preamble # 0 is subjected to a processing process that inverts part of the contents based on the preamble # 0.
- This processing is not limited to positive / negative reversal only.
- another calculation may be performed such that a part of the content is thinned to zero.
- another preamble sequence is a sequence obtained by adding the above-described processing to at least one of L-STF and L-LTF and adding a difference. It means that
- Each information processing device (other than the legacy device) that has received a packet having such a physical header changes the correlation calculation (or packet detection determination threshold) to be applied according to the magnitude of the RSSI of the signal.
- the physical header parameter determination process in the sixth embodiment of the present technology is substantially the same as that of the fourth embodiment of the present technology.
- the following extension may be added to the relational expression for determining the detection threshold value of each physical header.
- Expressions 3 and 6 described above may be replaced by introducing a threshold offset that takes into account deterioration due to processing such as positive / negative inversion in the preamble sequence.
- Expression 3 is changed to Expression 11 below, and Expression 6 is changed to It can be changed as shown in Equation 12.
- FIG. 26 is a flowchart illustrating a packet detection determination process (the processing procedure of step S730 illustrated in FIG. 17) in the transmission / reception process performed by the information processing apparatus 100 according to the sixth embodiment of the present technology.
- control unit 150 of the information processing apparatus 100 performs RSSI measurement on a signal input via the antenna 141, and holds the RSSI obtained by the measurement (step S771).
- control unit 150 of the information processing apparatus 100 compares the measured RSSI with the applied levels (L_far and L_near) of each physical header to determine the index of the physical header to be applied to detection. (Step S772).
- the index of the physical header applied to detection can be determined in the same manner as the selection method for selecting the transmission physical header of the own apparatus.
- control unit 150 of the information processing apparatus 100 compares the measured RSSI with the value of L_near, and when the measured RSSI exceeds L_near, the physical header used for correlation detection of the own apparatus Is determined to be 1 (for short distance). In addition, when the measured RSSI is equal to or less than L_near, the control unit 150 of the information processing apparatus 100 determines that the index of the physical header used for correlation detection of the own apparatus is 0 (for long distance).
- this determination procedure assumes that there is no difference in transmission power between the slave station and the master station. However, even if there is a difference in transmission power between the slave station and the parent station, if the information on the difference in transmission power is held in advance, the information is appropriately changed based on the held information on the difference in transmission power. The determination can be made after correction.
- the control unit 150 of the information processing apparatus 100 performs correlation calculation by switching the internal calculation of the correlator in accordance with the preamble sequence of the physical header of the determined index (Step S773).
- the switching of the internal calculation is a process equivalent to the process corresponding to “invert part of the contents to positive / negative”, which is the above-described generation method of the PLCP preamble part.
- FIG. 27 is a diagram illustrating a configuration example of a correlator provided in the information processing device 100 according to the sixth embodiment of the present technology.
- 27a is a modification of FIG. 11a
- FIG. 27b is a modification of b of FIG.
- FIG. 27 shows a configuration example of a correlator that performs a sign inversion operation based on a switching signal determined by RSSI. With this configuration, another preamble correlator can be easily configured.
- correlator output is the same as the definition of “correlator output” described above.
- the correlator operation may be switched corresponding to the preamble sequence of the physical header of the determined index, or the detection threshold may be switched without changing the operation. Moreover, you may make it switch both. Thus, it is possible to realize processing for selecting packets to be detected according to the situation.
- FIG. 26 shows an example of switching both.
- the control unit 150 of the information processing apparatus 100 switches between the correlator calculation and the detection threshold corresponding to the preamble sequence of the physical header of the determined index (step S773). That is, a correlator calculation and a detection threshold are set based on the determined index (step S773).
- control unit 150 of the information processing apparatus 100 compares the correlator output with the corresponding detection threshold value, and determines whether the value of the correlator output exceeds the detection threshold value (step S774).
- step S774 If the correlator output value exceeds the detection threshold (step S774), the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detection” (step S775).
- the control unit 150 of the information processing apparatus 100 compares the measured RSSI with the energy detection threshold ED (step S776). . Then, the control unit 150 of the information processing apparatus 100 determines whether or not the RSSI exceeds the energy detection threshold ED (step S776).
- step S776 If the RSSI exceeds the energy detection threshold ED (step S776), the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “detect only energy” (step S777).
- the control unit 150 of the information processing apparatus 100 sets the packet detection determination result to “non-detection” (step S778).
- the communication example between the master station and the slave station is shown in the star topology including the master station and the slave stations under the master station.
- the transmission destination of the subordinate slave stations is limited to the master station.
- the first to sixth embodiments of the present technology can also be applied during direct communication between subordinate slave stations.
- FIG. 28 is a diagram illustrating a system configuration example of the communication system 50 according to the seventh embodiment of the present technology.
- FIG. 28 is a modification of FIG. 1 and differs from FIG. 1 in that an information processing device 104 is added.
- the configuration of the information processing apparatus 104 is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 shown in FIG.
- portions common to the first to sixth embodiments of the present technology are denoted by the same reference numerals as those of the first to sixth embodiments of the present technology, and a part of these descriptions is omitted. .
- the communication system 50 includes information processing apparatuses 100 to 104 and information processing apparatuses 200 and 201.
- the information processing apparatus 104 is an information processing apparatus corresponding to the information processing apparatuses 100 to 103, and is, for example, a portable information processing apparatus having a wireless communication function.
- FIG. 29 is a sequence chart illustrating a communication processing example between devices included in the communication system 50 according to the seventh embodiment of the present technology.
- FIG. 29 shows an example of communication processing when direct transmission is performed between the information processing apparatus 100 and the information processing apparatus 104. The same applies to the relationship between other slave stations.
- the direct communication setup process basically conforms to the TDLS (Tunneling Direct Link Setup) function of the IEEE 802.11 standard. Also, FIG. 29 will be described assuming that the information processing apparatuses 100 and 104 are already connected to the information processing apparatus 200 and perform the operation described in the first embodiment of the present technology.
- TDLS Transmission Direct Link Setup
- a direct link connection process is performed between the information processing apparatuses 100, 104, and 200 (441). That is, each of the information processing apparatuses 100 and 104 executes a direct link establishment protocol via the access point (information processing apparatus 200) (441). This makes it possible to perform a direct link search process without breaking the protocol. Since the direct link connection process is the same as the standard definition, a detailed description thereof is omitted here.
- the control unit of the information processing device 200 performs a physical header parameter determination process (442).
- the master station information processing device 200 determines the physical header parameters used in the direct link between subordinate slave stations. For this reason, the slave station does not perform physical header parameter determination processing. Note that the physical header parameter determination process by the master station is the same as that in the first embodiment of the present technology.
- a physical header parameter sharing process is performed between the information processing apparatuses 100, 104, and 200 (443).
- the master station information processing apparatus 200
- the master station also determines the physical header parameters used in the direct link between subordinate slave stations. For this reason, physical header parameter sharing processing is not performed between slave stations that perform direct links.
- the physical header parameter sharing process between the master station and the slave station is the same as that in the first embodiment of the present technology.
- each of the information processing apparatuses 100 and 104 performs a used physical header determination process (444, 446).
- the physical header for the partner in direct link connection is determined according to the communication quality of the link with the partner, independently of that for the master station.
- the criteria for this determination are the same as in the first embodiment of the present technology. That is, the used physical header determination process between the slave stations is the same as that of the first embodiment of the present technology.
- each of the information processing apparatuses 100 and 104 performs transmission / reception processing (445, 447).
- This transmission / reception process is the same as that of the first embodiment of the present technology except that transmission / reception between slave stations is performed instead of transmission / reception between the master station and the slave station.
- the format of the PPDU in the seventh embodiment of the present technology is the same as that of the first embodiment of the present technology.
- FIG. 30 is a sequence chart illustrating a communication processing example between devices included in the communication system 50 according to the eighth embodiment of the present technology.
- FIG. 30 is a modification of FIG. 29, and there is a common part with FIG. For this reason, part of the description of the parts common to FIG. 29 is omitted.
- a direct link connection process is performed between the information processing apparatuses 100, 104, and 200 (451). This direct link connection process is the same as that of the seventh embodiment of the present technology.
- each of the information processing apparatuses 100 and 104 performs physical header parameter determination processing (452 and 453).
- the slave stations (information processing apparatuses 100 and 104) having connection destinations other than the master station autonomously determine the physical header parameters for the direct link.
- This physical header parameter determination process can be substantially the same as the process performed by the master station (information processing apparatus 200) in the first embodiment of the present technology.
- the sample object of COL_self_near and COL_self_far is different in that it is limited to a slave station (information processing device) that is directly connected to the own device even if it is the same BSSID.
- a physical header parameter sharing process is performed between the information processing apparatuses 100 and 104 (454).
- each of the information processing apparatuses 100 and 104 that perform a direct link periodically exchanges the direct link physical header parameters determined by the physical header parameter determination process between the direct links.
- each of the information processing apparatuses 100 and 104 grasps an operation expected by the direct link partner.
- the frame used for the exchange may be a data frame or a management frame.
- each of the information processing apparatuses 100 and 104 performs a used physical header determination process (455, 457).
- each of the information processing apparatuses 100 and 104 independently determines the physical header for each partner based on the parameter notified from the direct link partner, in addition to the parameter for the master station.
- the criteria for this determination and the like can be the same as those in the first embodiment of the present technology.
- each of the information processing apparatuses 100 and 104 performs transmission / reception processing (456, 458).
- This transmission / reception processing is the same as that of the seventh embodiment of the present technology.
- the ninth embodiment of the present technology an example in which a field for storing information related to the identifier of the BSS is added to the SIGNAL field of the IEEE 802.11 standard in addition to the Link Strength Category field.
- a field for storing information related to the identifier of the BSS is added to the SIGNAL field of the IEEE 802.11 standard in addition to the Link Strength Category field.
- the configuration of the information processing apparatus according to the ninth embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG.
- symbol same as 1st Embodiment of this technique is attached
- each process and each format in the ninth embodiment of the present technology also have parts in common with the first embodiment of the present technology. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 31 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the ninth embodiment of the present technology.
- FIG. 31 is the same as the example shown in FIG. 7 except that a BSS COLOR field is provided in the SIGNAL field. 7 are denoted by the same reference numerals as those in FIG. 7, and a part of the description is omitted.
- the PPDU includes a preamble 301, a SIGNAL 331, an extension 303, a service 304, an MPDU 305, and an FCS 306.
- a “Link Strength Category” field and a “BSS COLOR” field for storing information (COLOR information) regarding the identifier of the BSS are provided in a part of the SIGNAL field of the physical header.
- the “Link Strength Category” field is indicated as Link Strength Category
- the “BSS COLOR” field is indicated as COLOR.
- the COLOR information is information notified in advance from a connected partner device (for example, a master station), and identifies the BSS (Basic Service Set) to which the device belongs.
- Information eg, a numerical value. That is, the COLOR information (BSS COLOR information) is an example of an identifier for identifying a network.
- a BSSID is stored in the MAC header.
- the COLOR information can be expressed in the physical layer (PLCP layer) in a more simplified form than BSSID.
- the “Link Strength Category” field and the “COLOR” field are provided in the reserved portion in the SIGNAL 311. Thereby, the specific function in the ninth embodiment of the present technology can be realized without hindering reception of the legacy device.
- An information processing device (other than a legacy device) that has received a packet having at least one of the Link Strength Category field and the COLOR field can acquire the contents of each of these fields. Then, the information processing apparatus can change the detection threshold to be applied and the receiving operation based on the contents of these fields.
- connection process is the same as that of the first embodiment of the present technology.
- the physical header parameter determination process is also substantially the same as in the first embodiment of the present technology.
- the COLOR information is information that can be acquired in the physical layer. Therefore, unlike the BSSID information, the COLOR information can be used without waiting for the FCS (present at the end of the PPDU) collation in the PPDU. Therefore, when the physical header parameter determination process is performed, when the master station collects information regarding the communication quality of packets from other BSSs (OBSS), the classification is performed using COLOR information instead of BSSID. be able to.
- the physical header parameter sharing process is the same as the procedure of the first embodiment of the present technology.
- information of “COLOR” BSS identifier in the physical layer
- TxPower transmit power of the master station
- FIG. 32 is a diagram illustrating an example of a beacon frame format exchanged between devices included in the communication system 10 according to the ninth embodiment of the present technology. 32 is a modification of FIG. 14, portions common to FIG. 14 are denoted by the same reference numerals as those in FIG. 14, and a part of these descriptions is omitted.
- FIG. 32 shows an example in which elements “COLOR Info” 341 and “TxPower Info” 342 are newly added to Payload 340 together with “Multi Detect Parameter” 311.
- “COLOR Info” 341 stores a BSS identifier in the physical layer. This BSS identifier corresponds to the BSS identifier stored in the “BSS COLOR” field shown in FIG.
- TxPower Info 342 stores information regarding transmission power of an information processing apparatus (for example, a master station) that transmits a beacon.
- control unit of the information processing device 200 transmits a beacon in which each information is stored in the “Multi Detect Parameter” 311, “COLOR Info” 341, and “TxPower Info” 342 to notify the surrounding information processing devices.
- the information processing apparatus that has received the notification by the beacon acquires each information stored in the “Multi Detect Parameter” 311, “COLOR Info” 341, and “TxPower Info” 342 from the beacon and holds the information. That is, the information processing apparatus holds the contents of “Multi Detect Parameter”, the BSS identifier in the physical layer, and the transmission power of the communication partner (for example, the master station).
- the information included in the subsequent beacon changes after retaining the contents of the beacon
- the information (latest information) included in the latest beacon is adopted and retained.
- the master station may notify the contents of “Multi Detect Parameter”, the BSS identifier in the physical layer, and the transmission power of its own device using signals other than beacon transmission. For example, the master station may make a notification by a unicast data frame or a management frame to the subordinate terminal using a determination by the own device or an information acquisition request from the subordinate terminal as a trigger.
- FIG. 33 is a diagram showing the flow of backoff processing in the IEEE 802.11 standard.
- the horizontal axis is shown as a time axis.
- the state of the information processing apparatus (BUSY 500 to 502, IFS, Tx 503) is schematically shown by a rectangle.
- a numerical value representing the number of back-off slots (back-off counter) is shown below the horizontal axis.
- the timing of the transmission request 504 from the upper layer and the timing of the random backoff time generation 505 are schematically shown by rectangles and arrows.
- the IFS waiting time is entered every time. For example, when a transition is made to the IDLE state after BUSY 500 to 502, an IFS waiting time is entered. Also, as indicated by the numerical values on the lower side of the horizontal axis shown in FIG. 33, the back-off counter remains stopped while the physical header is being received.
- FIG. 34 is a diagram illustrating a flow of backoff processing by the information processing apparatus 100 according to the ninth embodiment of the present technology.
- FIG. 34 shows an example in which two information processing devices 521 and 522 existing at positions far from the information processing device 100 transmit packets.
- the horizontal axes related to the information processing apparatuses 521 and 522 and the state of the information processing apparatus on the upper side of the horizontal axes (PLCPs 513 and 514, PSDU) are also the same as in FIG.
- FIG. 34 shows an example in which, when the information processing apparatus 100 receives a packet transmitted from each of the information processing apparatuses 521 and 522, the reception is terminated based on the PLCPs 513 and 514 included in the packet (515). 516). Thereby, the periods of BUSY 511 and 512 can be shortened.
- the back-off counter does not decrease even if processing for discontinuing reception from distant information processing devices and transitioning to the IDLE state is performed.
- the back-off counter remains “8” and does not decrease from “8”. It becomes a state.
- the IFS is added after the transition from BUSY to IDLE. Therefore, the back-off counter does not decrease during the IFS. Further, the information processing apparatus 100 cannot perform transmission until the back-off counter becomes zero.
- FIG. 35 is a diagram illustrating a flow of backoff processing by the information processing apparatus 100 according to the ninth embodiment of the present technology. Since FIG. 35 is an example corresponding to FIG. 34, the same reference numerals are given to portions common to FIG.
- the information processing apparatus 100 receives a packet transmitted from each of the information processing apparatuses 521 and 522, the reception is performed based on the PLCPs 513 and 514 included in the packet, as in FIG. (515, 516) is shown. Further, in FIG. 35, along with the reception termination (reception cancellation), the back-off counter is subtracted assuming that the state is the IDLE state only for the time (elapsed time) related to the reception. In FIG. 35, immediately after the reception is aborted (reception cancellation), IFS waiting is not performed (that is, IFS is not inserted), and the back-off counter is subtracted.
- the time length from the start time of the physical header to the current time is calculated.
- the value “4” is subtracted from the back-off counter “8” to set the back-off counter to “4”. Also, the application of IFS prior to the subsequent carrier sense is canceled, and the decrement subtraction of the back-off counter is started immediately.
- EDCA enhanced distributed channel access
- control unit 150 of the information processing apparatus 100 can perform control so as not to generate a waiting time corresponding to the IFS after the reception of the packet is terminated.
- the control unit 150 converts the time length from the time when the carrier sense is changed to BUSY to the reception termination time when the packet is received, and subtracts it from the back-off counter. can do.
- the counter can be set to zero. That is, the control unit 150 of the information processing apparatus 100 can handle the result as 0 when the result after subtraction becomes a negative value.
- the back-off counter after subtraction becomes a negative value
- a random number is generated in the range between the value below the back-off counter value before subtraction and 0, and the value is subtracted.
- a later value may be used. That is, the random backoff may be performed within the range of the value of the original backoff counter before Busy.
- carrier sense in the physical layer has been described.
- the state is the BUSY state
- FIG. 36 is a flowchart illustrating an example of a processing procedure of a used physical header determination process (transmission physical header selection process) performed by the information processing device 100 according to the ninth embodiment of the present technology.
- This used physical header determination process is basically the same as in the first embodiment of the present technology, except that RSSI_peer is corrected based on TxPower notified from the other party.
- the control unit 150 of the information processing apparatus 100 monitors received packets from destinations connected to the information processing apparatus 100 and acquires RSSI for each destination (step S781).
- the RSSI (monitor result) acquired in this way is defined as RSSI_peer.
- the control unit 150 of the information processing apparatus 100 reads the measurement value and acquires the RSSI for each destination. (Step S781).
- the destination is basically only the parent station.
- a past beacon reception level may be used as a monitoring result.
- the control unit 150 of the information processing apparatus 100 corrects the acquired RSSI_peer in consideration of the transmission power difference (step S782).
- the “TxPower” information (stored in “TxPower Info” 342 shown in FIG. 32) notified from the master station in the physical header parameter sharing process is TP_peer.
- the transmission power used by the information processing apparatus 100 for transmission to the master station is TP_self.
- the corrected RSSI_adjusted can be obtained by the following equation (13).
- Expression 13 is a description assuming calculation in logarithm (dB).
- RSSI_adjusted RSSI_peer + (TP_self ⁇ TP_peer) Equation 13
- RSSI_adjusted indicates an estimated RSSI value when transmission from the information processing apparatus 100 is received on the master station side. However, when information corresponding to TP_peer cannot be obtained, RSSI_adjusted may be substituted with RSSI_peer.
- the control unit 150 of the information processing apparatus 100 compares the corrected RSSI_adjusted with the application level L_near of the physical header, and determines the physical header index used by the own apparatus for transmission based on the comparison result. (Step S783).
- the application level L_near of the physical header is included in the beacon transmitted from the information processing apparatus 200.
- the control unit 150 of the information processing apparatus 100 sets the index of the physical header used by the own apparatus to 1 (for short distance). Determination is made (step S783).
- the control unit 150 of the information processing apparatus 100 determines that the index of the physical header used by the own apparatus is 0 (for long distance). (Step S783).
- the already determined index is updated to the new index (Ste S783).
- FIG. 36 shows an example in which the used physical header is determined based on the binary classification of short distance and long distance
- the used physical header is determined based on the classification of three or more values (N value). It may be.
- the application level of each physical header is L_0, L_1,.
- n satisfying the following relational expression (Expression 14) is selected as an index of a physical header used for transmission.
- Expression 14 is a description assuming a logarithmic (dB) calculation.
- L_n ⁇ RSSI_adjusted ⁇ L_n + 1 Equation 14
- n 0 to N.
- FIG. 36 the example of operation on the slave station side in the case of uplink transmission from the slave station side to the master station side has been described. However, in the case of downlink transmission, the same operation is performed on the master station side. It may be.
- the processing content on the master station side in this case is the same as the processing content shown in FIG.
- the classification of received packet monitoring results is managed for each packet transmission source, and RSSI_adjusted is calculated individually for each link.
- a correlation output intensity COL may be used instead of RSSI.
- FIG. 37 is a flowchart illustrating an example of a processing procedure of transmission / reception processing by the information processing device 100 according to the ninth embodiment of the present technology.
- FIG. 37 demonstrates the information processing apparatus 100, it is applicable similarly about another information processing apparatus (for example, information processing apparatus 200). That is, this transmission / reception processing is equivalent to both the master station side and the terminal side.
- the control unit 150 of the information processing apparatus 100 performs packet detection / reception determination processing for a time other than during transmission and reception (step S800).
- the packet detection / reception determination process will be described in detail with reference to FIG.
- control unit 150 of the information processing apparatus 100 determines whether there is a packet to be transmitted (step S791). If there is no packet to be transmitted (step S791), the transmission / reception processing operation is terminated.
- step S791 If there is a packet to be transmitted (step S791), the control unit 150 of the information processing apparatus 100 determines whether the information processing apparatus 100 has acquired a transmission right (step S792).
- the state where the transmission right is acquired means, for example, a state where the back-off counter decremented according to the time when the carrier sense result is IDLE is 0.
- step S792 When the information processing apparatus 100 has acquired the transmission right (step S792), the control unit 150 of the information processing apparatus 100 performs packet transmission (step S794).
- step S792 the control unit 150 of the information processing apparatus 100 determines whether or not the packet to be transmitted is an immediate response to the packet received from the communication partner. Is determined (step S793).
- packets that are immediate responses to packets received from the communication partner are, for example, CTS frames, ACK frames, and Block Ack frames.
- step S793 If the packet to be transmitted is not an immediate response to the packet received from the communication partner (step S793), the transmission / reception processing operation is terminated without transmitting the packet.
- the control unit 150 of the information processing apparatus 100 performs packet transmission (step S794). In this way, transmission of a packet that is an immediate response to a packet received from a communication partner can be performed regardless of the state of carrier sense.
- the information processing apparatus 100 determines whether there is a packet to be transmitted and the transmission right has been acquired, and when the packet to be transmitted is an immediate response to the packet from the communication partner. Send.
- control unit 150 of the information processing apparatus 100 transmits the physical header having the format shown in a or b of FIG. 31 based on the physical header index determined in the used physical header determination process when the packet is transmitted. Use to send.
- control unit 150 of the information processing device 100 may, for example, perform modulation and communication channels that can be received with high probability by the destination device according to the detection threshold corresponding to the determined physical header. Select the encoding method and transmit using it. Further, the control unit 150 of the information processing apparatus 100, for example, selects a modulation and channel coding scheme (MCS) that can be received by the destination apparatus with a high probability according to a detection threshold corresponding to the determined physical header. You may make it select and transmit.
- MCS modulation and channel coding scheme
- FIG. 38 is a diagram illustrating a relationship example (processing classification table) between the processing performed by the information processing apparatus 100 and the physical header according to the ninth embodiment of the present technology.
- FIG. 38 will be described in detail with reference to FIG.
- FIG. 39 is a flowchart illustrating packet detection / reception determination processing (processing procedure of step S800 illustrated in FIG. 37) in the transmission / reception processing by the information processing apparatus 100 according to the ninth embodiment of the present technology.
- the control unit 150 of the information processing apparatus 100 measures RSSI with respect to a signal input via the antenna 141, and holds the RSSI obtained by the measurement (step S801). In addition, the control unit 150 of the information processing apparatus 100 performs correlation calculation of the preamble pattern to obtain a correlator output (step S801).
- This correlator output means the correlation output intensity COL described above. That is, the correlator output is not a normalized correlator output level but a correlator output converted to reflect the received power.
- each of the master station and the slave station corresponding to each function in the ninth embodiment of the present technology performs RSSI measurement on the signal input via the antenna while in the standby state.
- the correlator output is monitored (step S801).
- the control unit 150 of the information processing apparatus 100 performs pattern correlation calculation, and compares the output (correlator output) with the provisional detection threshold (step S802).
- the provisional detection threshold is a detection threshold for reading the SINGAL field prior to the main determination process.
- the temporary detection threshold for example, a value that is less than or equal to both PD_near and PD_far can be used.
- PD_default may be used as the temporary detection threshold.
- the control unit 150 of the information processing apparatus 100 compares the measured RSSI with the energy detection threshold ED (step S803). Then, the control unit 150 of the information processing apparatus 100 determines whether or not the RSSI exceeds the energy detection threshold ED (step S803).
- This energy detection threshold ED can be the same as the above-described value.
- step S803 When the RSSI exceeds the energy detection threshold ED (step S803), the control unit 150 of the information processing apparatus 100 maintains the carrier sense BUSY state (step S804), and the operation of the packet detection / reception determination process Exit. On the other hand, when the RSSI is equal to or lower than the energy detection threshold ED (step S803), the control unit 150 of the information processing apparatus 100 transitions to the carrier sense IDLE state (step S805), and performs packet detection / reception determination processing. End the operation.
- the control unit 150 of the information processing apparatus 100 determines that the provisional detection state is set, and transits to the carrier sense BUSY state (step S802). S806). Subsequently, the control unit 150 of the information processing apparatus 100 decodes the subsequent SIGNAL field in the physical header and reads information in the SIGNAL field (step S807). Specifically, each of the “Link Strength Category” field, the “COLOR” field, and the CRC (Cyclic Redundancy Check) of the physical header is read. As described above, information indicating a detection threshold to be applied is stored in the “Link Strength Category” field.
- control unit 150 of the information processing apparatus 100 collates each read information with the process classification table shown in FIG. 38, and determines the subsequent process (step S807).
- control unit 150 of the information processing apparatus 100 calculates the CRC of the physical header and checks whether there is an error in the physical header. Here, if there is an error in the physical header, the validity of the field value cannot be confirmed. For this reason, as shown in FIG. 38, when there is an error in the physical header, the subsequent processing is determined to be “reception termination (ERROR)”. If there is no error in the CRC of the physical header, the process is determined based on the contents of the “Link Strength Category” field and the “COLOR” field.
- the control unit 150 of the information processing apparatus 100 compares the determined detection threshold value with the value of the correlator output. If the correlator output value is smaller than the determined detection threshold, the subsequent processing is determined to be “reception termination (IDLE)” as shown in the upper part of FIG. However, as shown in the upper part of FIG. 38, when the COLOR field is present and the value of the COLOR field is the same as the value of the BSS to which the own device belongs, the subsequent processing is exceptionally performed as “reception”. Is determined. As a result, it is possible to avoid a case where detection of a packet to be originally received fails due to a change in reception level.
- the subsequent processing is determined as “reception” as shown in the lower part of FIG.
- the subsequent processing is exceptionally performed as “reception abortion ( BUSY) ".
- control unit 150 of the information processing apparatus 100 performs any of “reception”, “reception termination (IDLE)”, “reception termination (BUSY)”, and “reception termination (ERROR)” as subsequent processing. Determine (step S807).
- reception can be aborted.
- reception can be aborted when RSSI is very large.
- the detection threshold for the long distance is a value that does not give the highest level detection threshold.
- the correlator output value is significantly larger than the threshold value to be applied, the threshold value to be applied and the correlator output value may be largely mismatched. It can be inferred that such a state is a case where a packet transmitted from another BSS is detected. Therefore, in such a case, since it is not necessary to complete the reception, it is possible to stop the reception.
- the first detection threshold, the second detection threshold, and the third detection threshold are set in descending order of the detection threshold.
- the second detection threshold or the third detection threshold is a value that does not give the highest level detection threshold.
- the threshold value to be applied is the third detection threshold value and the correlator output value exceeds the second detection threshold value, the threshold value to be applied and the correlator output value are largely different. It can be judged that they are consistent.
- the threshold value to be applied is the second detection threshold value and the correlator output value exceeds the first detection threshold value
- the threshold value to be applied and the correlator output value are largely mismatched. It can be determined that It can be inferred that this state is a case where a packet transmitted from another BSS is detected as in the case of the binary value described above, and reception can be aborted.
- the threshold to be applied is the third detection threshold and the correlator output value exceeds the first detection threshold, it is highly likely that a packet transmitted from another BSS has been detected. Conceivable.
- the used physical header is determined based on a classification of four or more values
- reception can be aborted.
- the threshold value and the correlator output value it is possible to determine whether to set “reception termination (BUSY)” or “reception termination (IDLE)”. For example, the case where the value of the correlator output is higher than a determined detection threshold (threshold to be applied) by a certain value (for example, 20 dB or more) is set as an inconsistency target. And, if it is handled as inconsistency and the value of the correlator output exceeds a threshold that is one step higher than “Link Strength Category” in the PLCP header, it can be set to “reception abort (BUSY)”. .
- a determined detection threshold threshold to be applied
- a certain value for example, 20 dB or more
- the threshold that is one step higher is a detection threshold for short distance.
- the correlator output value does not exceed a threshold that is one step higher than the “Link Strength Category” in the PLCP header.
- the value of the correlator output is between the detection threshold for the short distance and the detection threshold for the long distance. In this case, it may be “reception termination (IDLE)”.
- the processing classification may be “reception abort (IDLE)” or “reception abort (BUSY)” according to the intensity of the correlator output and the contents of the SIGNAL field.
- the processing classification is normally “reception abortion (BUSY)”.
- the processing classification is set to “reception abort (IDLE)”. It is good also as.
- the control unit 150 of the information processing apparatus 100 continues to receive the temporarily detected packet to the end (step S809). Further, when the received packet is addressed to the own apparatus and an immediate response is requested, a physical header having the same “Link Strength Category” field as that of the target packet is added and transmitted. That is, the same information is stored in the SIGNAL field, and the information determined by the own device is stored in the other parts (for example, MCS and length).
- the control unit 150 of the information processing apparatus 100 aborts the reception of the temporarily detected packet at the end of the physical header, and enters the standby state. Return (step S810).
- the carrier sense state is handled as BUSY until the end time of the packet (step S811).
- the frame interval (IFS Inter frame ISpace)
- AIFS Aribitration IFS
- DIFS Distributed coordination function IFS
- Step S808 the control unit 150 of the information processing apparatus 100 aborts the reception of the temporarily detected packet at the end of the physical header, and enters the standby state. Return (step S812). Steps S807 to S812 are an example of the first procedure.
- the control unit 150 of the information processing apparatus 100 compares the measured RSSI with the energy detection threshold ED (step S813). If the measured RSSI exceeds the energy detection threshold ED (step S813), the control unit 150 of the information processing apparatus 100 maintains the carrier sense state as the BUSY state (step S814).
- the frame interval (IFS) before the next transmission attempt is set to AIFS or DIFS.
- step S813 when the measured RSSI is equal to or less than the energy detection threshold ED (step S813), the control unit 150 of the information processing apparatus 100 transitions the carrier sense state to the IDLE state (step S815).
- the frame interval (IFS) before the next transmission attempt is set to AIFS (step S819).
- the carrier sense is treated as IDLE retroactively to the preamble start time (or physical header start time) of the packet for which reception has been terminated, and processing is performed in which no detection is performed (step S820).
- the time length when the physical carrier sense result is BUSY (the packet detection determination time by the preamble or the time length from the start time of the physical header to the current time) is calculated. To do. Then, the time slot converted value of the length is subtracted from the back-off counter at once. Further, the application of IFS prior to the subsequent carrier sense is also canceled, and the back-off counter is immediately subtracted (step S820). Further, when the back-off counter after subtraction becomes a negative value, as described above, the absolute value is set to 0, and is used as a value less than the back-off counter value before subtraction. The value of the random number generated in the range between 0 and the value after subtraction can be used.
- step S808 the control unit 150 of the information processing apparatus 100 aborts the reception of the temporarily detected packet at the end of the physical header and waits. The state is returned (step S812).
- the control unit 150 of the information processing apparatus 100 compares the measured RSSI with the energy detection threshold ED (step S813). If the measured RSSI exceeds the energy detection threshold ED (step S813), the control unit 150 of the information processing apparatus 100 maintains the carrier sense state as the BUSY state (step S814). The packet is treated as an error, and the frame interval (IFS) before the next transmission attempt is EIFS (ExtendedExIFS).
- IFS frame interval
- step S813 when the measured RSSI is equal to or less than the energy detection threshold ED (step S813), the control unit 150 of the information processing apparatus 100 transitions the carrier sense state to the IDLE state (step S815).
- the control unit 150 of the information processing apparatus 100 determines whether or not the correlator output intensity is smaller than the minimum detection threshold (step S818). That is, it is determined whether or not the correlator output intensity is smaller than the minimum detection threshold value in the “Preamble Detection Threshold” shared in the PLCP header parameter sharing process described above (step S818).
- step S820 the control unit 150 of the information processing apparatus 100 performs processing that treats the carrier sense as IDLE and does not detect it, going back to the preamble start time (or physical header start time) of the aborted packet (step) S820). Note that steps S807, S808, S812, S813, and S815 to S820 are examples of the second procedure.
- the “detection threshold” in the ninth embodiment of the present technology can be the detection threshold of the L-STF unit.
- the detection threshold value of the L-STF unit instead of the detection threshold value of the L-STF unit, the detection threshold value of the L-LTF unit may be used, or the detection threshold value common to both the L-STF unit and the L-LTF unit may be used. Good.
- the detection threshold values of the L-STF part and the L-LTF part may be changed independently, and it may be extended so that both are specified as physical header parameters.
- control unit 150 of the information processing apparatus 100 performs control to interrupt the reception of the packet in the middle according to the first condition.
- the control unit 150 of the information processing apparatus 100 can operate the time from the start of reception of the packet to the end of reception of the packet according to the second condition as if the carrier sense was idle. .
- the first condition can be that the COLOR information specified in the physical header in the received packet is different from the COLOR information of the network to which the information processing apparatus 100 belongs.
- the first condition is that the preamble correlator output level in terms of antenna input of a packet being received is lower than a packet detection threshold derived from information described in the physical header of the packet. can do.
- the control unit 150 can perform the derivation based on the association between the index described in the physical header in the packet and the threshold value table shared in advance.
- the first condition can be that the CRC calculation result for the physical header part in the received packet matches the CRC described in the physical header.
- the second condition can be that the received power of a packet being received is lower than a predetermined energy detection threshold. Further, for example, the second condition can be that transmission suppression by virtual carrier sense is not applied at the time when reception of a packet is terminated.
- the condition regarding the CRC calculation result for the physical header part in the packet and the preamble correlator output level in terms of antenna input can be set as the second condition.
- the CRC calculation result does not match the CRC information described in the physical header, and the preamble correlator output level is lower than the minimum applicable packet detection threshold.
- the second condition can be set.
- the control unit 150 of the information processing apparatus 100 can determine whether the operation is necessary using the second condition.
- control unit 150 of the information processing device 100 prohibits transmission from the information processing device 100 during the duration of the packet transfer when the second condition is not satisfied after the reception of the packet is terminated. Also good. However, in this case, when receiving a frame addressed to the information processing apparatus 100 and requesting a response, the control unit 150 may transmit a response to the frame.
- the first condition may be included in the second condition.
- the control unit 150 of the information processing apparatus 100 when the packet detection condition is satisfied (for example, when the value of the correlator output is equal to or greater than the determined detection threshold), the control unit 150 of the information processing apparatus 100 “receives” the subsequent processing. And decide. However, when the COLOR information is present in the COLOR field and the COLOR information is different from the COLOR information of the network to which the information processing apparatus 100 belongs, the subsequent processing is determined as “reception termination (IDLE)”. That is, the reception of the packet is terminated and the standby state is restored.
- IDLE reception termination
- the control unit 150 when the packet detection condition is not satisfied (for example, when the value of the correlator output is smaller than the determined detection threshold), the control unit 150 performs “reception abort (IDLE)”. Is determined. However, when the COLOR information is present in the COLOR field and the COLOR information matches the COLOR information of the network to which the information processing apparatus 100 belongs, the subsequent processing is determined as “reception”. That is, the reception process of the packet is continued.
- IDLE reception abort
- the tenth embodiment of the present technology is a modification of the fourth embodiment of the present technology.
- each process and each format in the tenth embodiment of the present technology also have parts in common with the fourth embodiment of the present technology.
- symbol same as 4th Embodiment of this technique is attached
- FIG. 40 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the tenth embodiment of the present technology.
- FIG. 40 is the same as the example shown in FIG. 21 except that a BSS COLOR field is provided in the SIGNAL field. Therefore, the same parts as those in FIG. 21 are denoted by the same reference numerals as those in FIG.
- the PPDU includes a preamble 311, a SIGNAL 351, an extension 303, a service 304, an MPDU 305, and an FCS 306.
- a “BSS COLOR” field for storing information (COLOR information) related to the identifier of the BSS is provided in a part of the SIGNAL field of the physical header.
- the “BSS COLOR” field is shown as COLOR. Note that the BSS COLOR information is the same as that shown in the ninth embodiment of the present technology.
- the “COLOR” field is provided in a portion of the SIGNAL 311 that is reserved.
- connection process is the same as that of the first embodiment of the present technology.
- the physical header parameter determination process, the physical header parameter sharing process, and the used physical header determination process are the same as those in the ninth embodiment of the present technology.
- the transmission / reception process is the same as that of the ninth embodiment of the present technology except for the packet detection / reception determination process (the processing procedure of step S800 shown in FIG. 37).
- the packet detection / reception determination process will be described with reference to FIGS. 41 and 42.
- FIG. 41 is a diagram illustrating a relationship example (processing classification table) between a process performed by the information processing apparatus 100 and a physical header according to the tenth embodiment of the present technology. 41 will be described in detail with reference to FIG.
- FIG. 42 is a flowchart illustrating packet detection / reception determination processing (processing procedure of step S800 illustrated in FIG. 37) in the transmission / reception processing by the information processing apparatus 100 according to the tenth embodiment of the present technology.
- control unit 150 of the information processing apparatus 100 measures RSSI with respect to a signal input via the antenna 141, and holds the RSSI obtained by the measurement (step S821).
- control unit 150 of the information processing apparatus 100 compares the measured RSSI with the applied levels (L_far and L_near) of each physical header to determine the index of the physical header to be applied to detection. (Step S822).
- the index of the physical header applied to detection can be determined in the same manner as the selection method for selecting the transmission physical header of the own apparatus.
- control unit 150 of the information processing apparatus 100 compares the measured RSSI with the value of L_near, and when the measured RSSI exceeds L_near, the physical header used for correlation detection of the own apparatus Is determined to be 1 (for short distance). In addition, when the measured RSSI is equal to or less than L_near, the control unit 150 of the information processing apparatus 100 determines that the index of the physical header used for correlation detection of the own apparatus is 0 (for long distance).
- the control unit 150 of the information processing apparatus 100 performs correlation calculation using a correlator corresponding to the preamble sequence generated according to different rules as described above, in the physical header of the determined index (step S823).
- the correlator output means the correlation output intensity COL, as in the first embodiment of the present technology. That is, the correlator output is not a normalized correlator output level but a correlator output converted to reflect the received power.
- control unit 150 of the information processing apparatus 100 compares the correlator output of the selected correlator with the detection threshold value of the physical header at the determined index, and the value of the correlator output indicates the detection threshold value. It is determined whether or not it exceeds (step S824).
- the control unit 150 of the information processing device 100 decodes the subsequent SIGNAL field in the physical header, and stores the signal in the SIGNAL field. Information or the like is read (step S825). Specifically, the “COLOR” field and the CRC of the physical header are read out. Then, the control unit 150 of the information processing apparatus 100 determines any one of “reception”, “reception termination (IDLE)”, “reception termination (BUSY)”, and “reception termination (ERROR)” as subsequent processing. (Step S825).
- control unit 150 of the information processing apparatus 100 calculates the CRC of the physical header and checks whether there is an error in the physical header. Here, if there is an error in the physical header, the validity of the field value cannot be confirmed. For this reason, as shown in FIG. 41, when there is an error in the physical header, the subsequent processing is determined to be “reception abortion (ERROR)”.
- the process is determined based on the contents of the “COLOR” field. That is, when there is no error in the CRC of the physical header, basically, the subsequent processing is determined as “reception”. However, as shown in FIG. 41, when the COLOR field is present and the value of the COLOR field is different from the value of the BSS to which the own device belongs, the subsequent processing is exceptionally changed to “reception abort (BUSY). ) ”. As a result, it is possible to avoid a case where detection of a desired packet fails due to reception of a packet that does not need to be received.
- processing procedure (step S827) when “reception” is determined as the subsequent processing corresponds to the processing procedure (step S809) shown in FIG.
- each processing procedure (steps S828 and S829) when “reception termination (BUSY)” is determined as the subsequent processing corresponds to each processing procedure (steps S810 and S811) shown in FIG.
- the processing procedure (steps S830 to S832) when “reception termination (IDLE)” or “reception termination (ERROR)” is determined as the subsequent processing is the processing procedure (steps S813 to S815) shown in FIG. Correspond.
- step S824 If the correlator output value is equal to or lower than the detection threshold (step S824), the process proceeds to step S830. That is, when the value of the correlator output is less than or equal to the detection threshold (step S824), the subsequent processing is not performed and the preamble is not detected.
- the configuration of the information processing apparatus according to the eleventh embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 illustrated in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- the eleventh embodiment of the present technology is a modification of the ninth embodiment of the present technology.
- each process and each format in the eleventh embodiment of the present technology also have parts in common with the ninth embodiment of the present technology.
- portions common to the ninth embodiment of the present technology are denoted by the same reference numerals as those of the ninth embodiment of the present technology, and a part of these descriptions is omitted.
- FIG. 43 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the eleventh embodiment of the present technology.
- FIG. 43 is the same as the example shown in FIG. 31 except that “Requested Detection Level” is provided in the SIGNAL field instead of “Link Strength Category”. Therefore, parts common to those in FIG. 31 are denoted by the same reference numerals as those in FIG.
- the PPDU includes a preamble 301, a SIGNAL 361, an extension 303, a service 304, an MPDU 305, and an FCS 306.
- a “Requested Detection Level” field and a “BSS COLOR” field for storing COLOR information are provided in a part of the SIGNAL field of the physical header.
- the information processing apparatus can directly specify the signal level desired to be used for detection determination at the destination at the time of transmission.
- the signal level unit and the quantization method are assumed to be shared with the destination.
- each information processing apparatus changes the content of the “Requested Detection Level” field according to the quality of the link with the destination.
- the “Requested Detection Level” field and the “COLOR” field are provided in the portion of the SIGNAL 361 that is reserved. Thereby, the specific function in the eleventh embodiment of the present technology can be realized without hindering reception of the legacy device.
- an information processing apparatus (other than a legacy apparatus) that has received a packet including the “Requested Detection Level” field can acquire the contents of the “Requested Detection Level” field. Then, the information processing apparatus can directly use the content of the “Requested Detection Level” field as the detection threshold to be applied.
- connection process is the same as that of the first embodiment of the present technology.
- the physical header parameter determination process can be omitted as described above.
- the exchange of information between the master station and the slave station regarding the detection application threshold value can be omitted.
- the physical header parameter sharing process can be omitted.
- information of “COLOR” (BSS identifier in the physical layer) and “TxPower” (master station transmission power) is additionally transmitted.
- An example of the frame format used in this case is shown in FIG.
- FIG. 44 is a diagram illustrating an example of a beacon frame format exchanged between devices included in the communication system 10 according to the eleventh embodiment of the present technology. 44 is a modification of FIG. 32, and portions common to FIG. 32 are denoted by the same reference numerals as those in FIG.
- FIG. 44 shows an example in which “Multi Detect Parameter” 311 is omitted from Payload 340 shown in FIG. Note that “COLOR Info” 371 and “TxPower Info” 372 correspond to “COLOR Info” 341 and “TxPower Info” 342 shown in FIG. 32.
- control unit of the information processing device 200 transmits a beacon in which each information is stored in the “COLOR Info” 371 and the “TxPower Info” 372 to the surrounding information processing devices and notifies them.
- the information processing apparatus that has received the notification by the beacon acquires each information stored in the “COLOR Info” 371 and the “TxPower Info” 372 from the beacon and holds the information. That is, the information processing apparatus holds the contents of the BSS identifier in the physical layer and the transmission power of the communication partner (for example, a master station).
- the information included in the subsequent beacon changes after retaining the contents of the beacon
- the information (latest information) included in the latest beacon is adopted and retained.
- the master station may notify the contents of the BSS identifier in the physical layer and the transmission power of its own device using signals other than beacon transmission. For example, the master station may make a notification by a unicast data frame or a management frame to the subordinate terminal using a determination by the own device or an information acquisition request from the subordinate terminal as a trigger.
- FIG. 45 is a flowchart illustrating an example of a processing procedure of a used physical header determination process (transmission physical header selection process) performed by the information processing apparatus 100 according to the eleventh embodiment of the present technology.
- the control unit 150 of the information processing apparatus 100 monitors received packets from destinations connected to the information processing apparatus 100 and acquires RSSI for each destination (step S841).
- the RSSI (monitor result (RSSI measurement result for each destination)) acquired in this way is defined as RSSI_peer.
- the RSSI information from the master station to which the information processing apparatus 100 is connected can be RSSI_peer.
- the control unit 150 of the information processing apparatus 100 reads the measurement value and acquires the RSSI for each destination. (Step S841).
- the destination is basically only the parent station.
- a past beacon reception level may be used as a monitoring result.
- the control unit 150 of the information processing apparatus 100 corrects the acquired RSSI_peer in consideration of the transmission power difference (step S842). For example, “TxPower” information (stored in “TxPower Info” 372 shown in FIG. 44) notified from the master station by the beacon is set as TP_peer.
- the transmission power used by the information processing apparatus 100 for transmission to the master station is TP_self.
- the corrected RSSI_adjusted can be obtained by the following Expression 13 (same as Expression 13 in the ninth embodiment of the present technology).
- RSSI_adjusted RSSI_peer + (TP_self ⁇ TP_peer) Equation 13
- RSSI_adjusted indicates an estimated RSSI value when transmission from the information processing apparatus 100 is received on the master station side. However, when information corresponding to TP_peer cannot be obtained, RSSI_adjusted may be substituted with RSSI_peer.
- the control unit 150 of the information processing apparatus 100 converts RSSI_adjusted to the desired application detection level Lreq using the following Expression 15.
- Expression 15 is a description that assumes calculation in logarithm (dB).
- L_req RSSI_adjusted + O Equation 15
- O is an offset amount of a margin for a preamble detection error due to a change in reception level.
- O can be set to about ⁇ 10 dB to ⁇ 20 dB.
- the value of the desired application detection level L_req obtained in this manner is quantized in a predetermined shared unit and stored in the “Requested Detection Level” field 361 (part “xx” shown in FIG. 43).
- a correlation output intensity COL may be used instead of RSSI.
- FIG. 46 shows an example of the processing classification table used in the eleventh embodiment of the present technology.
- FIG. 46 is a diagram illustrating a relationship example (processing classification table) between the processing performed by the information processing apparatus 100 and the physical header according to the eleventh embodiment of the present technology.
- the detection threshold to be applied is directly described in the “Requested Detection Level” field. Therefore, in the eleventh embodiment of the present technology, the detection threshold (application desired detection level Lreq) described in the “Requested Detection Level” field can be used as it is.
- the processing classification table in the eleventh embodiment of the present technology is different from the processing classification table (shown in FIG. 38) in the ninth embodiment of the present technology in the detection threshold to be applied.
- Other processing is the same as that of the ninth embodiment of the present technology, and thus description thereof is omitted here.
- the twelfth embodiment of the present technology an example is provided in which a field for storing information related to the identifier of the BSS is provided in the SIGNAL field of the IEEE 802.11 standard without providing the Link Strength Category field.
- packet selection is performed using only the BSS identifier is described.
- the configuration of the information processing apparatus according to the twelfth embodiment of the present technology is substantially the same as the information processing apparatuses 100 to 103, 200, and 201 shown in FIG. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- each process and each format in the twelfth embodiment of the present technology also have parts in common with the first embodiment of the present technology. For this reason, about the part which is common in 1st Embodiment of this technique, the code
- FIG. 47 is a diagram illustrating an example of a format of a PPDU exchanged between devices included in the communication system 10 according to the twelfth embodiment of the present technology.
- FIG. 47 is the same as the example shown in FIG. 7 except that a BSS COLOR field is provided in the SIGNAL field instead of the Link Strength Category field. 7 are denoted by the same reference numerals as those in FIG. 7, and a part of the description is omitted.
- the PPDU includes a preamble 301, a SIGNAL 381, an extension 303, a service 304, an MPDU 305, and an FCS 306.
- a “BSS COLOR” field for storing information (COLOR information) related to the identifier of the BSS is provided in a part of the SIGNAL field of the physical header.
- the “BSS COLOR” field is shown as COLOR.
- Show. 47 b corresponds to c in FIG. 7.
- the “COLOR” field is provided in the SIGNAL 311.
- the COLOR field is stored in that portion, thereby preventing the reception of the legacy device in the twelfth embodiment of the present technology.
- Specific functions can be realized.
- COLOR information is stored in that portion.
- An information processing apparatus (other than a legacy apparatus) that has received a packet having a COLOR field can acquire the contents of the COLOR field. Then, the information processing apparatus can change the detection threshold to be applied and the reception operation based on the contents of the COLOR field.
- connection process is the same as that of the first embodiment of the present technology.
- FIG. 48 is a flowchart illustrating an example of a processing procedure of physical header parameter determination processing by the information processing device 200 according to the twelfth embodiment of the present technology.
- the control unit of the information processing device 200 creates a physical header parameter (for example, each detection threshold value of the physical header) used by the subordinate terminal in the own BSS and the own device (if already existing).
- a physical header parameter for example, each detection threshold value of the physical header
- the physical header difference in the twelfth embodiment of the present technology is that the BSS identifier information (COLOR information) in the physical header matches that to which the own apparatus belongs, or , Does not match, means the difference.
- control unit of the information processing apparatus 200 performs packet monitoring (step S841). Then, the control unit of the information processing device 200 acquires each piece of information related to the communication quality with each subordinate information processing device in the own BSS and the communication quality of the packet from the other BSS (OBSS) (step S841).
- OBSS BSS
- the correlation output strength of RSSI or PLCP preamble is used as an index of communication quality.
- This correlation output intensity is not the correlator output itself with normalized power, but indicates the absolute level obtained by multiplying the correlator output by the received signal power intensity (RSSI). That is, the correlation output intensity means a correlator output corrected to antenna input conversion. If there is a reception history at a relatively short time, the correlation output intensity record at that time may be used. Further, when monitoring, the detection threshold may be temporarily lowered so that samples can be collected more reliably.
- control unit of the information processing device 200 classifies communication quality of received packets from information processing devices under its control in the own BSS and communication quality of received packets from other BSS (OBSS) (step S842). ). Then, the control unit of the information processing device 200 extracts the minimum correlation output intensity related to the own BSS and the maximum correlation output intensity related to the OBSS (step S842).
- the minimum correlation output strength related to the own BSS means the minimum correlation output strength of a packet whose BSS identifier (the BSSID in the MAC header or the BSS COLOR information in the physical header) is the same as the BSS to which the own device belongs, Let it be COL_self.
- the maximum correlation output strength related to OBSS means the maximum correlation output strength of a packet whose BSS identifier (BSSID in the MAC header or BSS COLOR information in the physical header) is different from the BSS to which the own apparatus belongs, and is COL_other.
- a COL that does not have a packet sample with the corresponding condition is replaced with PD_default.
- PD_default represents the reference level of preamble detection used by the legacy device, and in the IEEE802.11 standard, a value of -82 dBm per 20 MHz bandwidth is referred to as a standard value.
- the control unit of the information processing device 200 determines a detection threshold value PD_self for a physical header indicating its own BSS and a detection threshold value PD_other for a physical header indicating OBSS based on each extracted correlation output intensity (step) S843).
- the detection threshold value PD_self and the detection threshold value PD_other can be determined within a range in which the relationship of the following Expression 16, Expression 17, and Expression 18 holds. Note that the determination of PD_self may be omitted. In that case, PD_default is substituted.
- PD_self ⁇ COL_self ... Formula 16 PD_other> COL_other Expression 17 PD_other ⁇ COL_self ... Equation 18 In this case, when there is no PD_other that satisfies Expression 17 and Expression 18 at the same time, Expression 18 is prioritized.
- the PD_other may be determined individually for each subordinate information processing apparatus.
- the index of the information processing apparatus is n
- PD_other to be used by the nth information processing apparatus is PD_other (n).
- the control unit of the information processing device 200 classifies the packets transmitted from the subordinate information processing devices in the own BSS among the above monitoring results for each transmission source.
- PD_other (n) is determined so as to satisfy the following Expression 19.
- Even when setting individually, PD_other (n) does not necessarily have to be specified for all the devices under its control. In that case, information on the common PD_other to be used by devices that have not been individually specified is additionally determined.
- the carrier sense detection ranges 31 to 34 of the information processing apparatuses 100 and 102 are schematically shown by dotted circles.
- the carrier sense detection ranges 41 to 44 of the information processing apparatuses 200 and 201 are schematically shown by dotted circles.
- the carrier sense detection range 31 corresponds to the carrier sense detection range of the information processing apparatus 100 set based on the detection threshold value PD_self for the physical header indicating the own BSS of the information processing apparatus 100.
- the carrier sense detection range 33 corresponds to the carrier sense detection range of the information processing apparatus 100 set based on the detection threshold value PD_other (n) for the physical header indicating the OBSS of the information processing apparatus 100.
- the carrier sense detection range 32 indicates the carrier sense detection range of the information processing apparatus 102 set based on the detection threshold value PD_self for the physical header indicating the own BSS of the information processing apparatus 102.
- the carrier sense detection range 34 corresponds to the carrier sense detection range of the information processing apparatus 102 set based on the detection threshold value PD_other (n) for the physical header indicating the OBSS of the information processing apparatus 102.
- the carrier sense detection range 41 corresponds to the carrier sense detection range of the information processing device 200 set based on the detection threshold value PD_self for the physical header indicating the own BSS of the information processing device 200.
- the carrier sense detection range 43 corresponds to the carrier sense detection range of the information processing device 200 set based on the detection threshold value PD_other (n) for the physical header indicating the OBSS of the information processing device 200.
- the carrier sense detection range 42 indicates the carrier sense detection range of the information processing apparatus 201 set based on the detection threshold value PD_self for the physical header indicating the own BSS of the information processing apparatus 201.
- the carrier sense detection range 44 corresponds to the carrier sense detection range of the information processing apparatus 201 set based on the detection threshold value PD_other (n) for the physical header indicating the OBSS of the information processing apparatus 201.
- the determination of the monitor and the set value shown in FIG. 48 may be performed at regular time intervals or whenever a connection of a new subordinate apparatus is detected, so that the set value is sequentially updated.
- the physical header parameter sharing process is the same as that of the first embodiment of the present technology.
- the physical header parameter is a detection threshold value of each physical header (detection threshold value PD_self of the own BSS physical header and detection threshold value PD_other of the OBSS physical header).
- detection threshold value PD_self of the own BSS physical header and detection threshold value PD_other of the OBSS physical header An example of the frame format used in this case is shown in FIG.
- FIG. 49 is a diagram illustrating an example of a beacon frame format exchanged between devices included in the communication system 10 according to the twelfth embodiment of the present technology. 49 is a modified example of FIG. 14, and a part of the description of the parts common to FIG. 14 is omitted.
- FIG. 49 illustrates an example in which elements “Multi Detect Parameter” 391 and “COLOR Info” 392 are newly added to Payload 390.
- Multi Detect Parameter 391 is provided with three fields 393 to 395.
- Preamble Detection Threshold for Packets of This BSS 393 stores the detection threshold value PD_self of the BSS physical header.
- the Preamble Detection Threshold for Packets of OBSS 394 stores the detection threshold value PD_other of the OBSS physical header.
- Allow No Color Filtering 395 information indicating whether or not to allow reception termination for a packet not including the BSS COLOR is stored. Whether or not to permit this reception termination can be set according to, for example, a device connected to the information processing apparatus 200. For example, when there is no device under the control of the information processing device 100 (for example, a legacy device) to which COLOR information cannot be added, the control unit of the information processing device 200 may set the permission. it can.
- Allow No Color Filtering 395 when other fields can substitute, you may make it substitute by another field. In this way, when substituting with another field, it is possible to omit storing the information to be stored in the Allow No Color Filtering 395 in the “Multi Detect Parameter”.
- “COLOR Info” 392 stores a BSS identifier in the physical layer. This BSS identifier corresponds to the BSS identifier stored in the “BSS COLOR” field shown in FIG.
- control unit of the information processing device 200 transmits a beacon in which each information is stored in the “Multi Detect Parameter” 391 and the “COLOR Info” 392 to the surrounding information processing devices for notification.
- the information processing apparatus that has received the notification by the beacon acquires each information stored in the “Multi Detect Parameter” 391 and “COLOR Info” 392 from the beacon and holds the information. That is, the information processing apparatus holds the contents of “Multi Detect Parameter” and the BSS identifier in the physical layer.
- PD_other to be used by the information processing apparatus is individually specified
- PD_other (n) corresponding to the own apparatus is held as the value of PD_other. If there is no individual designation, the PD_other value that the subordinate apparatuses should use in common is held.
- the information included in the subsequent beacon changes after retaining the contents of the beacon
- the information (latest information) included in the latest beacon is adopted and retained.
- the master station may notify the contents of “Multi Detect Parameter” and the BSS identifier in the physical layer using signals other than beacon transmission. For example, the master station may make a notification by a unicast data frame or a management frame to the subordinate terminal using a determination by the own device or an information acquisition request from the subordinate terminal as a trigger.
- Example of physical header determination processing In the twelfth embodiment of the present technology, BSS COLOR information used in the own BSS is added to the physical header. Also, the PLCP header is not changed according to the link state. Note that the used physical header determination process is performed in the same way for both uplink and downlink.
- the transmission / reception process according to the twelfth embodiment of the present technology has the same procedure as the ninth embodiment (transmission / reception processing shown in FIG. 37) of the present technology.
- both the master station side and the slave station side can be equivalent to the transmission / reception process shown in FIG.
- both the master station side and the slave station side are basically performing packet detection / reception determination processing at times other than during transmission and reception.
- the packet detection / reception determination process in the twelfth embodiment of the present technology is basically the same as that of the ninth embodiment (operation example shown in FIG. 39) of the present technology. However, the processing classification table to be referenced is different.
- FIG. 50 is a diagram illustrating a relationship example (processing classification table) between a process performed by the information processing apparatus 100 and a physical header according to the twelfth embodiment of the present technology. 50 will be described in detail with reference to FIG.
- each of the master station and the slave station corresponding to each function in the twelfth embodiment of the present technology receives RSSI from a signal input via an antenna while in a standby state. And the correlator output are monitored (step S801).
- the control unit 150 of the information processing apparatus 100 performs correlation calculation of the preamble pattern, and compares the output (correlator output) with the provisional detection threshold (step S802).
- the provisional detection threshold is a detection threshold for reading the SINGAL field prior to the main determination process.
- the temporary detection threshold for example, a value that is less than or equal to both PD_self and PD_other can be used.
- PD_default may be used as the temporary detection threshold.
- correlator output means the above-mentioned correlation output intensity COL, and is not a normalized correlator output level but a correlator output converted to reflect the received power. .
- the control unit 150 of the information processing apparatus 100 determines that the provisional detection state is set, and transits to the carrier sense BUSY state (step S802). S806). Subsequently, the control unit 150 of the information processing apparatus 100 decodes the subsequent SIGNAL field in the physical header and reads information in the SIGNAL field (step S807). Specifically, the “COLOR” field and the CRC of the physical header are read out.
- control unit 150 of the information processing apparatus 100 collates each read information with the process classification table shown in FIG. 50, and determines the subsequent process (step S807).
- control unit 150 of the information processing apparatus 100 calculates the CRC of the physical header and checks whether there is an error in the physical header. Here, if there is an error in the physical header, the validity of the field value cannot be confirmed. Therefore, as shown in FIG. 50, when there is an error in the physical header, the subsequent processing is determined as “reception termination (ERROR)”. When there is no error in the CRC of the physical header, the process is determined based on the contents of the “COLOR” field and each piece of information shared in the physical header parameter sharing process.
- the subsequent processing is determined as “reception”.
- control unit 150 of the information processing apparatus 100 compares the determined detection threshold value with the value of the correlator output.
- the subsequent processing is “reception abortion”. (IDLE) ".
- the subsequent processing is performed as follows. Reception abortion (BUSY) ”.
- the correlator output when the value of the correlator output is low with respect to the detection threshold value PD_other, it means that the value of the correlator output is less than or equal to the detection threshold value PD_other or less than the detection threshold value PD_other. Further, when the correlator output value is high with reference to the detection threshold value PD_other, it means that the correlator output value is equal to or greater than the detection threshold value PD_other or exceeds the detection threshold value PD_other.
- the value of the correlator output is low with reference to the detection threshold value PD_other, and when the value of the correlator output is equal to or less than the detection threshold value PD_other, the value of the correlator output is high with reference to the detection threshold value PD_other. Assume that the output value exceeds the detection threshold value PD_other.
- the correlation value is high when the correlator output value is high with respect to the detection threshold value PD_other. Assume that the output value of the detector is equal to or greater than the detection threshold value PD_other.
- the subsequent processing is basically “reception”.
- the same determination as in the case of the above-described COLOR mismatch is made only when reception interruption of a packet not including COLOR information is permitted in the BSS. This permission can be determined based on the information stored in the Allow No COLOR Filtering 395 shown in FIG.
- the control unit 150 can perform the derivation by the conversion based on the value described in the physical header in the packet and the information on the quantization and unit shared in advance.
- the communication system including the access point has been described as an example.
- the embodiment of the present technology is also applied to a communication system that does not include the access point. be able to.
- a communication system that does not include an access point is, for example, a mesh network or an ad hoc network.
- the packet detection condition (PLCP detection with the most relaxed condition) is expected during the time period when the response is expected. Threshold) may be used.
- the carrier sense method may cause a situation where excessive transmission suppression occurs and the transmission efficiency of the entire system decreases. Therefore, there is a method to increase the transmission opportunity by increasing the carrier sense detection threshold.
- the transmission opportunity on the transmission side increases, if the receiving terminal receives an irrelevant packet first, You lose the opportunity. For this reason, the receiving side needs to appropriately increase the detection threshold.
- a plurality of physical headers to be used depending on the attenuation with the destination are defined, and different detection threshold values corresponding to each are prepared.
- the detection operation can be appropriately changed according to the communication partner. That is, according to the embodiment of the present technology, it is possible to avoid excessive transmission suppression as necessary, increase both transmission opportunities and reception opportunities, and improve the utilization efficiency of radio resources. In other words, radio resources can be efficiently used for channel access in radio transmission.
- the information processing apparatuses 100 to 104, 200, and 201 are a smartphone, a tablet PC (Personal Computer), a notebook PC, a mobile terminal such as a portable game terminal or a digital camera, a television receiver, a printer, a digital scanner, or a network storage. It may be realized as a fixed terminal such as a car-mounted terminal such as a car navigation device.
- the information processing apparatuses 100 to 104, 200, and 201 are terminals (MTC (MAChine Type)) that perform M2M (MAChine To MAChine) communication, such as smart meters, vending machines, remote monitoring apparatuses, or POS (Point Of Sale) terminals. Communication) (also referred to as a terminal). Furthermore, the information processing apparatuses 100 to 104, 200, and 201 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these terminals.
- the information processing apparatuses 200 and 201 may be realized as a wireless LAN access point (also referred to as a wireless base station) having a router function or not having a router function. Further, the information processing devices 200 and 201 may be realized as a mobile wireless LAN router. Further, the information processing apparatuses 200 and 201 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these apparatuses.
- a wireless LAN access point also referred to as a wireless base station
- the information processing devices 200 and 201 may be realized as a mobile wireless LAN router.
- the information processing apparatuses 200 and 201 may be wireless communication modules (for example, integrated circuit modules configured by one die) mounted on these apparatuses.
- FIG. 51 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied.
- the smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 913, an antenna switch 914, an antenna 915, A bus 917, a battery 918, and an auxiliary controller 919 are provided.
- the processor 901 may be, for example, a CPU (Central Processing Unit) or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900.
- the memory 902 includes a RAM (Rando MACcess Memory) and a ROM (Read Only Memory), and stores programs and data executed by the processor 901.
- the storage 903 can include a storage medium such as a semiconductor memory or a hard disk.
- the external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
- the camera 906 includes, for example, an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image.
- the sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
- the microphone 908 converts sound input to the smartphone 900 into an audio signal.
- the input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button, or a switch, and receives an operation or information input from a user.
- the display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900.
- the speaker 911 converts an audio signal output from the smartphone 900 into audio.
- the wireless communication interface 913 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and performs wireless communication.
- the wireless communication interface 913 can communicate with other devices via a wireless LAN access point in the infrastructure mode.
- the wireless communication interface 913 can directly communicate with other devices in the ad-hoc mode or the direct communication mode such as Wi-Fi Direct.
- Wi-Fi Direct unlike the ad hoc mode, one of two terminals operates as an access point, but communication is performed directly between the terminals.
- the wireless communication interface 913 can typically include a baseband processor, an RF (Radio Frequency) circuit, a power amplifier, and the like.
- the wireless communication interface 913 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 913 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a cellular communication method in addition to the wireless LAN method.
- the antenna switch 914 switches the connection destination of the antenna 915 among a plurality of circuits (for example, circuits for different wireless communication schemes) included in the wireless communication interface 913.
- the antenna 915 includes a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission and reception of radio signals by the radio communication interface 913.
- the smartphone 900 is not limited to the example of FIG. 51, and may include a plurality of antennas (for example, an antenna for a wireless LAN and an antenna for a proximity wireless communication method). In that case, the antenna switch 914 may be omitted from the configuration of the smartphone 900.
- the bus 917 connects the processor 901, memory 902, storage 903, external connection interface 904, camera 906, sensor 907, microphone 908, input device 909, display device 910, speaker 911, wireless communication interface 913, and auxiliary controller 919 to each other.
- the battery 918 supplies power to each block of the smartphone 900 shown in FIG. 51 through a power supply line partially shown by a broken line in the drawing.
- the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.
- control unit 150 described with reference to FIG. 5 may be implemented in the wireless communication interface 913.
- at least a part of these functions may be implemented in the processor 901 or the auxiliary controller 919.
- the power consumption of the battery 918 can be reduced by efficiently using radio resources by grouping.
- the smartphone 900 may operate as a wireless access point (software AP) when the processor 901 executes the access point function at the application level. Further, the wireless communication interface 913 may have a wireless access point function.
- FIG. 52 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied.
- the car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication.
- An interface 933, an antenna switch 934, an antenna 935, and a battery 938 are provided.
- the processor 921 may be a CPU or SoC, for example, and controls the navigation function and other functions of the car navigation device 920.
- the memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.
- the GPS module 924 measures the position (for example, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites.
- the sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor.
- the data interface 926 is connected to the in-vehicle network 941 through a terminal (not shown), for example, and acquires data generated on the vehicle side such as vehicle speed data.
- the content player 927 reproduces content stored in a storage medium (for example, CD or DVD) inserted into the storage medium interface 928.
- the input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and receives an operation or information input from the user.
- the display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of content to be reproduced.
- the speaker 931 outputs the navigation function or the audio of the content to be played back.
- the wireless communication interface 933 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and executes wireless communication.
- the wireless communication interface 933 can communicate with other devices via a wireless LAN access point in the infrastructure mode.
- the wireless communication interface 933 can directly communicate with other devices in the ad-hoc mode or the direct communication mode such as Wi-Fi Direct.
- the wireless communication interface 933 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 933 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a proximity wireless communication system, or a cellular communication system.
- the antenna switch 934 switches the connection destination of the antenna 935 among a plurality of circuits included in the wireless communication interface 933.
- the antenna 935 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 933.
- the car navigation device 920 is not limited to the example of FIG. 52, and may include a plurality of antennas. In that case, the antenna switch 934 may be omitted from the configuration of the car navigation device 920.
- the battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 52 via a power supply line partially shown by a broken line in the drawing. Further, the battery 938 stores electric power supplied from the vehicle side.
- control unit 150 described with reference to FIG. 5 may be implemented in the wireless communication interface 933.
- the control unit 150 described with reference to FIG. 5 may be implemented in the wireless communication interface 933.
- the car navigation device 920 illustrated in FIG. Further, at least a part of these functions may be implemented in the processor 921.
- the wireless communication interface 933 may operate as the information processing apparatus 100 described above, and provide a wireless connection to a terminal of a user who gets on the vehicle.
- the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942.
- vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.
- FIG. 53 is a block diagram illustrating an example of a schematic configuration of a wireless access point 950 to which the technology according to the present disclosure can be applied.
- the wireless access point 950 includes a controller 951, a memory 952, an input device 954, a display device 955, a network interface 957, a wireless communication interface 963, an antenna switch 964, and an antenna 965.
- the controller 951 may be a CPU or a DSP (Digital Signal Processor), for example, and various functions (for example, access restriction, routing, encryption, firewall) of the IP (Internet Protocol) layer and higher layers of the wireless access point 950 And log management).
- the memory 952 includes a RAM and a ROM, and stores programs executed by the controller 951 and various control data (for example, a terminal list, a routing table, an encryption key, security settings, and a log).
- the input device 954 includes, for example, a button or a switch and receives an operation from the user.
- the display device 955 includes an LED lamp and the like, and displays the operation status of the wireless access point 950.
- the network interface 957 is a wired communication interface for connecting the wireless access point 950 to the wired communication network 958.
- the network interface 957 may have a plurality of connection terminals.
- the wired communication network 958 may be a LAN such as Ethernet (registered trademark), or may be a WAN (Wide Area Network).
- the wireless communication interface 963 supports one or more of wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and provides a wireless connection as an access point to nearby terminals.
- the wireless communication interface 963 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 963 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the antenna switch 964 switches the connection destination of the antenna 965 among a plurality of circuits included in the wireless communication interface 963.
- the antenna 965 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 963.
- control unit 150 described with reference to FIG. 5 may be implemented in the wireless communication interface 963 in the wireless access point 950 illustrated in FIG.
- control unit 150 may be implemented in the controller 951.
- the processing procedure described in the above embodiment may be regarded as a method having a series of these procedures, and a program for causing a computer to execute these series of procedures or a recording medium storing the program. You may catch it.
- a recording medium for example, a CD (Compact Disc), an MD (MiniDisc), a DVD (Digital Versatile Disc), a memory card, a Blu-ray disc (Blu-ray (registered trademark) Disc), or the like can be used.
- this technique can also take the following structures.
- (1) In accordance with the first condition, the reception of the packet is interrupted in the middle, and further, the control is performed so that the time from the start of reception of the packet until the reception of the packet is canceled is assumed that the carrier sense is in an idle state.
- An information processing apparatus including a control unit.
- (2) The information processing unit according to (1), wherein the control unit performs control so as not to generate a waiting time corresponding to IFS (Inter Frame Space) when the second condition is satisfied after the reception of the packet is terminated. apparatus.
- IFS Inter Frame Space
- the control unit converts the time length from the time when the carrier sense transitions to BUSY at the time of reception of the packet to the reception termination time into a slot time.
- the control unit treats the result as 0 when the result after the subtraction becomes a negative value.
- the control unit sets the negative value to a positive value so as not to exceed the back-off counter before the subtraction (3 ).
- the first condition includes that the CRC calculation result for the physical header portion in the packet being received does not match the CRC information described in the physical header, (1) to (5) The information processing apparatus according to any one of the above. (7) The first condition further includes that the information regarding the identifier is different from the network identifier of the network to which the information processing apparatus belongs when information regarding an identifier for identifying the network exists in a physical header in the packet. The information processing apparatus according to (6). (8) The first condition further includes that a preamble correlator output level in terms of antenna input of the packet being received is lower than a threshold derived from information described in a physical header in the packet. The information processing apparatus according to (6).
- the control unit aborts reception when information on an identifier for identifying a network exists in a physical header in the packet, and the information on the identifier matches a network identifier of a network to which the information processing apparatus belongs.
- the information processing apparatus according to (8) which continues without any change.
- (11) The information processing apparatus according to (8), wherein the control unit performs the derivation by conversion based on a value described in a physical header in the packet and information on quantization and units shared in advance.
- the information processing apparatus includes the first condition.
- the control unit determines whether the operation is necessary based on the second condition that reception power of the packet being received is lower than a predetermined energy detection threshold value.
- the control unit determines whether the operation is necessary based on the second condition that transmission suppression by virtual carrier sense is not applied at the time when reception of the packet is terminated.
- the information processing apparatus according to any one of the above.
- the control unit includes a preamble correlator in which the CRC calculation result for the physical header part in the packet does not match the CRC information described in the physical header, and the packet is converted into an antenna input.
- the information according to any one of (1) to (10), in which whether or not the operation is necessary is determined based on the second condition that an output level is below a minimum of applicable packet detection thresholds.
- Processing equipment (16) The control unit performs control to prohibit transmission from the information processing apparatus during the duration of the packet transfer when the second condition is not satisfied after the reception of the packet is terminated. ). (17) When the control unit does not satisfy the second condition after the reception of the packet is terminated and prohibits transmission from the information processing device during the duration of the packet transfer, the control unit is addressed to the information processing device, and The information processing apparatus according to (16), which performs control to transmit a response to the frame when a frame requesting a response is received.
- a first procedure that terminates packet reception halfway according to a first condition An information processing method comprising: a second procedure that operates assuming that the carrier sense is in an idle state for a time from the start of reception of the packet to the end of reception of the packet according to a second condition. (19) A first procedure that terminates packet reception halfway according to a first condition; A program for causing a computer to execute a second procedure that operates assuming that the carrier sense is in an idle state from the start of reception of the packet to the end of reception of the packet according to a second condition.
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Abstract
Description
1.第1の実施の形態(Link Strength Category fieldを、IEEE802.11規格のSIGNALフィールド内に設け、情報処理装置に応じたパケット検出条件を設定する例)
2.第2の実施の形態(パケット検出判定結果がエネルギーのみ検出であり、送信抑制が設定された場合には、一切の送信を行わない例)
3.第3の実施の形態(Link Strength Category fieldを、IEEE802.11規格のServiceフィールド内に設ける例)
4.第4の実施の形態(検出閾値の異なる複数のプリアンブル系列を送信側において使用し、受信側はRSSIにより適用するプリアンブル相関検出器を切り替える例)
5.第5の実施の形態(配下の情報処理装置が使用する物理ヘッダの選択を親局側が行う例)
6.第6の実施の形態(区別するための複数のPLCPプリアンブルの生成を、完全な別系列ではなく、元の系列を一部加工して生成する例)
7.第7の実施の形態(子局間で直接通信を行う例)
8.第8の実施の形態(ダイレクトリンク間で使用する物理ヘッダパラメータを子局が決定する例)
9.第9の実施の形態(IEEE802.11規格のSIGNALフィールド内にBSSの識別子に関する情報を格納する例)
10.第10の実施の形態(Preambleの系列を複数定義するとともにCOLOR情報を併用する例)
11.第11の実施の形態(物理ヘッダパラメータの決定処理を省略する例)
12.第12の実施の形態(IEEE802.11規格のSIGNALフィールド内にBSSの識別子に関する情報を格納するフィールドを設ける例)
13.応用例
[通信システムの構成例]
図1は、本技術の第1の実施の形態における通信システム10のシステム構成例を示す図である。
図2および図3は、本技術の第1の実施の形態における通信システム10のシステム構成例を示す図である。図2および図3では、図1に示す例において、各情報処理装置のキャリアセンス検出範囲を重畳した場合の例を示す。
図5は、本技術の第1の実施の形態における情報処理装置100の機能構成例を示すブロック図である。なお、情報処理装置101乃至103、200、201の機能構成(無線通信に関する機能構成)については、情報処理装置100と略同様であるため、ここでの説明を省略する。
図6は、本技術の第1の実施の形態における通信システム10を構成する各装置間における通信処理例を示すシーケンスチャートである。
図7は、本技術の第1の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
図8は、本技術の第1の実施の形態における通信システム10を構成する各装置間における接続処理例を示すシーケンスチャートである。
図9は、本技術の第1の実施の形態における情報処理装置200のメモリ(図5に示すメモリ160に相当)に記憶される設定情報リスト161の内容の一例を模式的に示す図である。
図10は、本技術の第1の実施の形態における情報処理装置200による物理ヘッダパラメータ決定処理の処理手順の一例を示すフローチャートである。
L_near>PD_near+O_near … 式1
L_far=-∞ … 式2
相関出力強度COL=RSSI×正規化された相関器出力
図11は、本技術の第1の実施の形態における情報処理装置200に備えられる相関器の構成例を示す図である。なお、図11では、リファレンスとなる一般的な相関器の構成例を示す。ここで、図11に記載されている(*)の演算子は複素共役演算を示す。
PD_near>COL_other_near … 式3
PD_far<COL_self_far … 式4
PD_far>COL_other_far … 式5
図12および図13は、本技術の第1の実施の形態における通信システム10のシステム構成例を示す図である。
PD_n>COL_other_n … 式6
ただし、n=0乃至Nとする。
PD_0<COL_self_0 … 式7
L_n>PD_n+O_n … 式8
ただし、n=1乃至Nとする。
L_0=-∞ … 式9
図14は、本技術の第1の実施の形態における通信システム10を構成する各装置間でやりとりされるビーコンフレームフォーマットの一例を示す図である。ここでは、情報処理装置200から他の情報処理装置に送信されるビーコンフレームの例を示す。
図15は、本技術の第1の実施の形態における通信システム10を構成する各装置間における物理ヘッダパラメータ共有処理例を示すシーケンスチャートである。
図16は、本技術の第1の実施の形態における情報処理装置100による使用物理ヘッダ決定処理(送信用物理ヘッダの選択処理)の処理手順の一例を示すフローチャートである。
L_n≦RSSI_peer<L_n+1 … 式10
ただし、n=0乃至Nとする。
図17は、本技術の第1の実施の形態における情報処理装置100による送受信処理の処理手順の一例を示すフローチャートである。なお、図17では、情報処理装置100について説明するが、他の情報処理装置(例えば、情報処理装置200)についても同様に適用することができる。すなわち、この送受信処理は、親局側も端末側も同等の処理となる。
本技術の第1の実施の形態では、パケット検出判定結果が「エネルギーのみ検出」であり、送信抑制が設定された場合でも、その送信抑制を一時的に解除する例を示した。すなわち、送信抑制が設定された場合でも、自装置宛てのパケットを受信し、その受信の直後の応答を要求された場合のみ、その応答パケットの送信を行うため、その送信抑制を一時的に解除する例を示した。
図19は、本技術の第2の実施の形態における情報処理装置100による送受信処理の処理手順の一例を示すフローチャートである。なお、図19は、図17に示す送受信処理の一部を変形したものである。このため、図17に示す送受信処理と共通する部分については、図17と同一の符号を付してこれらの説明の一部を省略する。
本技術の第1の実施の形態では、Link Strength Category fieldを、IEEE802.11規格のSIGNALフィールド内に設ける例を示した。
図20は、本技術の第3の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
図18に示す送受信処理(ステップS735)において、「SIGNALフィールド」を「Serviceフィールド」に読み替えて、図17、図18に示す送受信処理と同等の処理を行うことにより、本技術の第3の実施の形態を実現することができる。
本技術の第1乃至第3の実施の形態では、物理ヘッダのフィールドの内容に基づいてPLCPの検出閾値を変化させる例を示した。
図21は、本技術の第4の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
図22は、本技術の第4の実施の形態における情報処理装置100による送受信処理のうちのパケット検出判定処理(図17に示すステップS730の処理手順)を示すフローチャートである。
本技術の第5の実施の形態は、本技術の第4の実施の形態の変形例であり、配下の情報処理装置が使用する物理ヘッダの選択を親局側が行う例を示す。また、受信側は、候補となるプリアンブル系列の相関器を常時並列に動作させる例を示す。
図23は、本技術の第5の実施の形態における通信システム10を構成する各装置間でやりとりされるビーコンフレームフォーマットの一例を示す図である。なお、図23は、図14の変形例であるため、図14と共通する部分については、図14と同一の符号を付してこれらの説明の一部を省略する。
図24は、本技術の第5の実施の形態における通信システム10を構成する各装置間における接続処理例を示すシーケンスチャートである。
図25は、本技術の第5の実施の形態における情報処理装置100による送受信処理のうちのパケット検出判定処理(図17に示すステップS730の処理手順)を示すフローチャートである。
本技術の第6の実施の形態は、本技術の第4の実施の形態の変形例であり、区別するための複数のPLCPプリアンブルの生成を、完全な別系列ではなく、元の系列を一部加工して生成する例を示す。これにより、受信側の複数の相関器の構成を簡易化することができる。また、加工元のプリアンブル系列をレガシィ装置用フォーマットの系列とすることにより、条件によっては特定機能に非対応の情報処理装置もプリアンブルを検出することができ、後方互換性を一部残すことが可能となる。
本技術の第6の実施の形態におけるPPDUのフォーマットは、図21に示す例と同様である。
本技術の第6の実施の形態における物理ヘッダパラメータの決定処理は、本技術の第4の実施の形態と略同様である。ただし、本技術の第6の実施の形態では、各物理ヘッダの検出閾値の決定基準の関係式に、次のような拡張を加えるようにしてもよい。
PD_near>COL_other_near+A_near … 式11
PD_n>COL_other_n+A_n … 式12
ただし、n=0乃至Nとする。
図26は、本技術の第6の実施の形態における情報処理装置100による送受信処理のうちのパケット検出判定処理(図17に示すステップS730の処理手順)を示すフローチャートである。
図27は、本技術の第6の実施の形態における情報処理装置100に備えられる相関器の構成例を示す図である。なお、図27のaは、図11のaの変形例であり、図27のbは、図11のbの変形例である。また、図27は、RSSIにより判定される切り換え信号に基づいて符号反転の演算を加える相関器の構成例を示す。このように構成することにより、別のプリアンブルの相関器を容易に構成することができる。
本技術の第1乃至第6の実施の形態では、親局および配下の子局により構成されるスター型トポロジにおいて、親局および子局間の通信例を示した。また、この通信例では、配下の子局の送信の宛先を親局に限定していた。ただし、配下の子局間の直接通信時についても、本技術の第1乃至第6の実施の形態を適用することができる。
図28は、本技術の第7の実施の形態における通信システム50のシステム構成例を示す図である。
図29は、本技術の第7の実施の形態における通信システム50を構成する各装置間における通信処理例を示すシーケンスチャートである。
本技術の第7の実施の形態では、ダイレクトリンク間で使用する物理ヘッダパラメータを親局が決定する例を示した。しかしながら、ダイレクトリンク間で使用する物理ヘッダパラメータを子局(ダイレクトリンクを行う子局)が決定するようにしてもよい。
図30は、本技術の第8の実施の形態における通信システム50を構成する各装置間における通信処理例を示すシーケンスチャートである。
本技術の第1の実施の形態では、IEEE802.11規格のSIGNALフィールド内に、Link Strength Category fieldを設ける例を示した。
図31は、本技術の第9の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
図32は、本技術の第9の実施の形態における通信システム10を構成する各装置間でやりとりされるビーコンフレームフォーマットの一例を示す図である。なお、図32は、図14の変形例であるため、図14と共通する部分については、図14と同一の符号を付してこれらの説明の一部を省略する。
図33は、IEEE802.11規格におけるバックオフ処理の流れを示す図である。図33では、横軸を時間軸として示す。また、横軸の上側には、情報処理装置の状態(BUSY500乃至502、IFS、Tx503)を矩形で模式的に示す。また、横軸の下側には、バックオフスロット数(バックオフカウンタ)を表す数値を示す。また、上位層からの送信要求504のタイミングと、ランダムバックオフタイム生成505のタイミングとを矩形および矢印で模式的に示す。
図34は、本技術の第9の実施の形態における情報処理装置100によるバックオフ処理の流れを示す図である。図34に示す横軸、横軸の上側の情報処理装置の状態(BUSY510乃至512、IFS)、横軸の下側のバックオフスロット数(バックオフカウンタ)を表す数値については、図33と同様である。
図35は、本技術の第9の実施の形態における情報処理装置100によるバックオフ処理の流れを示す図である。図35は、図34に対応する例であるため、図34と共通する部分には、同一の符号を付して説明する。
図36は、本技術の第9の実施の形態における情報処理装置100による使用物理ヘッダ決定処理(送信用物理ヘッダの選択処理)の処理手順の一例を示すフローチャートである。この使用物理ヘッダ決定処理は、基本的に本技術の第1の実施の形態と同じであるが、RSSI_peerを、相手から通知されたTxPowerに基づいて補正する点が異なる。
RSSI_adjusted=RSSI_peer+(TP_self-TP_peer) … 式13
L_n≦RSSI_adjusted<L_n+1 … 式14
ただし、n=0乃至Nとする。
図37は、本技術の第9の実施の形態における情報処理装置100による送受信処理の処理手順の一例を示すフローチャートである。なお、図37では、情報処理装置100について説明するが、他の情報処理装置(例えば、情報処理装置200)についても同様に適用することができる。すなわち、この送受信処理は、親局側も端末側も同等の処理となる。
図38は、本技術の第9の実施の形態における情報処理装置100が行う処理と物理ヘッダとの関係例(処理分類テーブル)を示す図である。なお、図38については、図39を参照して詳細に説明する。
本技術の第4の実施の形態では、Preambleの系列を複数定義する例を示した。本技術の第10の実施の形態では、本技術の第4の実施の形態と同様に、Preambleの系列を複数定義するとともに、COLOR情報を併用することにより選別精度をさらに向上させる例を示す。なお、本技術の第10の実施の形態における情報処理装置の構成については、図1等に示す情報処理装置100乃至103、200、201と略同一である。このため、本技術の第1の実施の形態と共通する部分については、本技術の第1の実施の形態と同一の符号を付してこれらの説明の一部を省略する。
図40は、本技術の第10の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
図41は、本技術の第10の実施の形態における情報処理装置100が行う処理と物理ヘッダとの関係例(処理分類テーブル)を示す図である。なお、図41については、図42を参照して詳細に説明する。
本技術の第9の実施の形態では、物理ヘッダパラメータの決定処理を行う例を示した。本技術の第11の実施の形態では、物理ヘッダパラメータの決定処理を省略する例を示す。
図43は、本技術の第11の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
図44は、本技術の第11の実施の形態における通信システム10を構成する各装置間でやりとりされるビーコンフレームフォーマットの一例を示す図である。なお、図44は、図32の変形例であるため、図32と共通する部分については、図32と同一の符号を付してこれらの説明の一部を省略する。
図45は、本技術の第11の実施の形態における情報処理装置100による使用物理ヘッダ決定処理(送信用物理ヘッダの選択処理)の処理手順の一例を示すフローチャートである。
RSSI_adjusted=RSSI_peer+(TP_self-TP_peer) … 式13
L_req=RSSI_adjusted+O … 式15
送受信処理については、本技術の第9の実施の形態と略同等であり、仮検出後の物理ヘッダの処理の分類テーブルのみが異なる。そこで、本技術の第11の実施の形態で用いる処理分類テーブルの一例を図46に示す。
本技術の第1の実施の形態では、IEEE802.11規格のSIGNALフィールド内に、Link Strength Category fieldを設ける例を示した。
図47は、本技術の第12の実施の形態における通信システム10を構成する各装置間でやりとりされるPPDUのフォーマットの一例を示す図である。
接続処理については、本技術の第1の実施の形態と同様である。
図48は、本技術の第12の実施の形態における情報処理装置200による物理ヘッダパラメータ決定処理の処理手順の一例を示すフローチャートである。
PD_self<COL_self … 式16
PD_other>COL_other … 式17
PD_other<COL_self … 式18
なお、この場合において、式17および式18を同時に満たすPD_otherが存在しない場合には、式18を優先する。
PD_other(n)<COL_self(n) … 式19
なお、個別に設定する場合でも、必ずしも配下の全装置に対してPD_other(n)を指定しなくてもよい。その場合には、個別指定がされなかった装置が使用すべき共通のPD_otherの情報を追加で決定する。
また、物理ヘッダパラメータの共有処理については、本技術の第1の実施の形態と手順は同様である。ただし、本技術の第12の実施の形態では、物理ヘッダパラメータは、各物理ヘッダの検出閾値(自BSS用物理ヘッダの検出閾値PD_selfおよびOBSS用物理ヘッダの検出閾値PD_other)である。この場合に用いられるフレームフォーマットの一例を図49に示す。
図49は、本技術の第12の実施の形態における通信システム10を構成する各装置間でやりとりされるビーコンフレームフォーマットの一例を示す図である。なお、図49は、図14の変形例であるため、図14と共通する部分についての説明の一部を省略する。
本技術の第12の実施の形態では、物理ヘッダに対し、自BSSで使用されるBSS COLOR情報を付加する。また、リンクの状態に応じてPLCPヘッダを変更することは行わない。なお、使用物理ヘッダ決定処理は、上りリンクでも下りリンクでも同様に行われる。
本技術の第12の実施の形態における送受信処理は、本技術の第9の実施の形態(図37に示す送受信処理)と手順は同様である。例えば、親局側および子局側の双方が図37に示す送受信処理と同等とすることができる。例えば、親局側および子局側の双方は、基本的に送信中および受信中以外の時間は、パケット検出/受信判定処理を行っているものとする。
本技術の第12の実施の形態におけるパケット検出/受信判定処理は、基本的に本技術の第9の実施の形態(図39に示す動作例)と同様である。ただし、参照する処理分類テーブルが異なる。
本開示に係る技術は、様々な製品へ応用可能である。例えば、情報処理装置100乃至104、200、201は、スマートフォン、タブレットPC(Personal Computer)、ノートPC、携帯型ゲーム端末若しくはデジタルカメラなどのモバイル端末、テレビジョン受像機、プリンタ、デジタルスキャナ若しくはネットワークストレージなどの固定端末、又はカーナビゲーション装置などの車載端末として実現されてもよい。また、情報処理装置100乃至104、200、201は、スマートメータ、自動販売機、遠隔監視装置又はPOS(Point Of Sale)端末などの、M2M(MAChine To MAChine)通信を行う端末(MTC(MAChine Type Communication)端末ともいう)として実現されてもよい。さらに、情報処理装置100乃至104、200、201は、これら端末に搭載される無線通信モジュール(例えば、1つのダイで構成される集積回路モジュール)であってもよい。
図51は、本開示に係る技術が適用され得るスマートフォン900の概略的な構成の一例を示すブロック図である。スマートフォン900は、プロセッサ901、メモリ902、ストレージ903、外部接続インタフェース904、カメラ906、センサ907、マイクロフォン908、入力デバイス909、表示デバイス910、スピーカ911、無線通信インタフェース913、アンテナスイッチ914、アンテナ915、バス917、バッテリー918及び補助コントローラ919を備える。
図52は、本開示に係る技術が適用され得るカーナビゲーション装置920の概略的な構成の一例を示すブロック図である。カーナビゲーション装置920は、プロセッサ921、メモリ922、GPS(Global Positioning System)モジュール924、センサ925、データインタフェース926、コンテンツプレーヤ927、記憶媒体インタフェース928、入力デバイス929、表示デバイス930、スピーカ931、無線通信インタフェース933、アンテナスイッチ934、アンテナ935及びバッテリー938を備える。
図53は、本開示に係る技術が適用され得る無線アクセスポイント950の概略的な構成の一例を示すブロック図である。無線アクセスポイント950は、コントローラ951、メモリ952、入力デバイス954、表示デバイス955、ネットワークインタフェース957、無線通信インタフェース963、アンテナスイッチ964及びアンテナ965を備える。
(1)
パケットの受信を第1条件に応じて途中で打ち切り、さらに第2条件に応じて前記パケットの受信開始から前記パケットの受信打ち切りまでの時間をキャリアセンスがアイドル状態だったものとして動作させる制御を行う制御部を具備する情報処理装置。
(2)
前記制御部は、前記パケットの受信打ち切り後、前記第2条件を満たした場合には、IFS(Inter Frame Space)に相当する待ち時間を発生させないように制御する前記(1)に記載の情報処理装置。
(3)
前記制御部は、前記パケットの受信打ち切り後、前記第2条件を満たした場合には、前記パケットの受信時においてキャリアセンスがBUSYに遷移した時刻から受信打ち切り時刻までの時間長をスロットタイムに換算してバックオフカウンタから減算する制御を行う前記(1)または(2)に記載の情報処理装置。
(4)
前記制御部は、前記減算後の結果が負の値になる場合には、前記結果を0として扱う前記(3)に記載の情報処理装置。
(5)
前記制御部は、前記減算後の結果が負の値になる場合には、前記減算前のバックオフカウンタを超えないように、当該負の値の分を正に折り返した値とする前記(3)に記載の情報処理装置。
(6)
前記第1条件は、受信中の前記パケットにおける物理ヘッダ部を対象とするCRC計算結果が、前記物理ヘッダ内に記載されているCRC情報と一致しないことを含む、前記(1)から(5)のいずれかに記載の情報処理装置。
(7)
前記第1条件は、前記パケットにおける物理ヘッダ内にネットワークを識別するための識別子に関する情報が存在する場合に、前記識別子に関する情報が前記情報処理装置の属するネットワークのネットワーク識別子と異なることをさらに含む、前記(6)に記載の情報処理装置。
(8)
前記第1条件は、受信中の前記パケットの、アンテナ入力換算でのプリアンブル相関器出力レベルが、前記パケットにおける物理ヘッダ内に記載された情報から導出される閾値を下回っていることをさらに含む、前記(6)に記載の情報処理装置。
(9)
前記制御部は、前記パケットにおける物理ヘッダ内にネットワークを識別するための識別子に関する情報が存在し、前記識別子に関する情報が前記情報処理装置の属するネットワークのネットワーク識別子と一致する場合には、受信を打ち切ることなく継続する、前記(8)に記載の情報処理装置。
(10)
前記制御部は、前記パケットにおける物理ヘッダ内に記載されたインデックスと予め共有されている閾値のテーブルとの対応付けに基づいて前記導出を行う前記(8)に記載の情報処理装置。
(11)
前記制御部は、前記パケットにおける物理ヘッダ内に記載された値と、予め共有されている量子化および単位に関する情報とに基づく変換により前記導出を行う前記(8)に記載の情報処理装置。
(12)
前記第2条件は、前記第1条件を含む前記(1)に記載の情報処理装置。
(13)
前記制御部は、受信中の前記パケットの受信電力が予め定められたエネルギー検出閾値を下回ることを前記第2条件として、前記動作の要否を判断する前記(1)から(10)のいずれかに記載の情報処理装置。
(14)
前記制御部は、前記パケットの受信打ち切りを行った時点においてバーチャルキャリアセンスによる送信抑制がかかっていないことを前記第2条件として、前記動作の要否を判断する前記(1)から(10)のいずれかに記載の情報処理装置。
(15)
前記制御部は、前記パケットにおける物理ヘッダ部を対象とするCRC計算結果が、前記物理ヘッダ内に記載されているCRC情報と一致せず、かつ、前記パケットの、アンテナ入力換算でのプリアンブル相関器出力レベルが、適用されうるパケット検出閾値のうち最小のものを下回っていることを前記第2条件として、前記動作の要否を判断する前記(1)から(10)のいずれかに記載の情報処理装置。
(16)
前記制御部は、前記パケットの受信打ち切り後に前記第2条件を満たさない場合には、当該パケット転送の継続期間中の前記情報処理装置からの送信を禁止する制御を行う前記(1)から(15)のいずれかに記載の情報処理装置。
(17)
前記制御部は、前記パケットの受信打ち切り後に前記第2条件を満たさず、当該パケット転送の継続期間中の前記情報処理装置からの送信を禁止した場合において、前記情報処理装置宛てであり、かつ、応答を要求するフレームを受信したときには、前記フレームに対する応答を送信する制御を行う前記(16)に記載の情報処理装置。
(18)
パケットの受信を第1条件に応じて途中で打ち切る第1手順と、
第2条件に応じて前記パケットの受信開始から前記パケットの受信打ち切りまでの時間をキャリアセンスがアイドル状態だったとして動作する第2手順と
を具備する情報処理方法。
(19)
パケットの受信を第1条件に応じて途中で打ち切る第1手順と、
第2条件に応じて前記パケットの受信開始から前記パケットの受信打ち切りまでの時間をキャリアセンスがアイドル状態だったとして動作する第2手順と
をコンピュータに実行させるプログラム。
100~104、200、201 情報処理装置
110 データ処理部
120 伝送処理部
130 変復調部
140 無線インターフェース部
141 アンテナ
150 制御部
160 メモリ
900 スマートフォン
901 プロセッサ
902 メモリ
903 ストレージ
904 外部接続インタフェース
906 カメラ
907 センサ
908 マイクロフォン
909 入力デバイス
910 表示デバイス
911 スピーカ
913 無線通信インタフェース
914 アンテナスイッチ
915 アンテナ
917 バス
918 バッテリー
919 補助コントローラ
920 カーナビゲーション装置
921 プロセッサ
922 メモリ
924 GPSモジュール
925 センサ
926 データインタフェース
927 コンテンツプレーヤ
928 記憶媒体インタフェース
929 入力デバイス
930 表示デバイス
931 スピーカ
933 無線通信インタフェース
934 アンテナスイッチ
935 アンテナ
938 バッテリー
941 車載ネットワーク
942 車両側モジュール
950 無線アクセスポイント
951 コントローラ
952 メモリ
954 入力デバイス
955 表示デバイス
957 ネットワークインタフェース
958 有線通信ネットワーク
963 無線通信インタフェース
964 アンテナスイッチ
965 アンテナ
Claims (19)
- パケットの受信を第1条件に応じて途中で打ち切り、さらに第2条件に応じて前記パケットの受信開始から前記パケットの受信打ち切りまでの時間をキャリアセンスがアイドル状態だったものとして動作させる制御を行う制御部を具備する情報処理装置。
- 前記制御部は、前記パケットの受信打ち切り後、前記第2条件を満たした場合には、IFS(Inter Frame Space)に相当する待ち時間を発生させないように制御する請求項1記載の情報処理装置。
- 前記制御部は、前記パケットの受信打ち切り後、前記第2条件を満たした場合には、前記パケットの受信時においてキャリアセンスがBUSYに遷移した時刻から受信打ち切り時刻までの時間長をスロットタイムに換算してバックオフカウンタから減算する制御を行う請求項1記載の情報処理装置。
- 前記制御部は、前記減算後の結果が負の値になる場合には、前記結果を0として扱う請求項3記載の情報処理装置。
- 前記制御部は、前記減算後の結果が負の値になる場合には、前記減算前のバックオフカウンタを超えないように、当該負の値の分を正に折り返した値とする請求項3記載の情報処理装置。
- 前記第1条件は、受信中の前記パケットにおける物理ヘッダ部を対象とするCRC計算結果が、前記物理ヘッダ内に記載されているCRC情報と一致しないことを含む、請求項1記載の情報処理装置。
- 前記第1条件は、前記パケットにおける物理ヘッダ内にネットワークを識別するための識別子に関する情報が存在する場合に、前記識別子に関する情報が前記情報処理装置の属するネットワークのネットワーク識別子と異なることをさらに含む、請求項6記載の情報処理装置。
- 前記第1条件は、受信中の前記パケットの、アンテナ入力換算でのプリアンブル相関器出力レベルが、前記パケットにおける物理ヘッダ内に記載された情報から導出される閾値を下回っていることをさらに含む、請求項6記載の情報処理装置。
- 前記制御部は、前記パケットにおける物理ヘッダ内にネットワークを識別するための識別子に関する情報が存在し、前記識別子に関する情報が前記情報処理装置の属するネットワークのネットワーク識別子と一致する場合には、受信を打ち切ることなく継続する、請求項8記載の情報処理装置。
- 前記制御部は、前記パケットにおける物理ヘッダ内に記載されたインデックスと予め共有されている閾値のテーブルとの対応付けに基づいて前記導出を行う請求項8記載の情報処理装置。
- 前記制御部は、前記パケットにおける物理ヘッダ内に記載された値と、予め共有されている量子化および単位に関する情報とに基づく変換により前記導出を行う請求項8記載の情報処理装置。
- 前記第2条件は、前記第1条件を含む請求項1記載の情報処理装置。
- 前記制御部は、受信中の前記パケットの受信電力が予め定められたエネルギー検出閾値を下回ることを前記第2条件として、前記動作の要否を判断する請求項1記載の情報処理装置。
- 前記制御部は、前記パケットの受信打ち切りを行った時点においてバーチャルキャリアセンスによる送信抑制がかかっていないことを前記第2条件として、前記動作の要否を判断する請求項1記載の情報処理装置。
- 前記制御部は、前記パケットにおける物理ヘッダ部を対象とするCRC計算結果が、前記物理ヘッダ内に記載されているCRC情報と一致せず、かつ、前記パケットの、アンテナ入力換算でのプリアンブル相関器出力レベルが、適用されうるパケット検出閾値のうち最小のものを下回っていることを前記第2条件として、前記動作の要否を判断する請求項1記載の情報処理装置。
- 前記制御部は、前記パケットの受信打ち切り後に前記第2条件を満たさない場合には、当該パケット転送の継続期間中の前記情報処理装置からの送信を禁止する制御を行う請求項1記載の情報処理装置。
- 前記制御部は、前記パケットの受信打ち切り後に前記第2条件を満たさず、当該パケット転送の継続期間中の前記情報処理装置からの送信を禁止した場合において、前記情報処理装置宛てであり、かつ、応答を要求するフレームを受信したときには、前記フレームに対する応答を送信する制御を行う請求項16記載の情報処理装置。
- パケットの受信を第1条件に応じて途中で打ち切る第1手順と、
第2条件に応じて前記パケットの受信開始から前記パケットの受信打ち切りまでの時間をキャリアセンスがアイドル状態だったとして動作する第2手順と
を具備する情報処理方法。 - パケットの受信を第1条件に応じて途中で打ち切る第1手順と、
第2条件に応じて前記パケットの受信開始から前記パケットの受信打ち切りまでの時間をキャリアセンスがアイドル状態だったとして動作する第2手順と
をコンピュータに実行させるプログラム。
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EP3169133A1 (en) | 2017-05-17 |
KR20170028894A (ko) | 2017-03-14 |
US10667293B2 (en) | 2020-05-26 |
AU2015286420A1 (en) | 2017-01-05 |
CN106664721A (zh) | 2017-05-10 |
KR102344656B1 (ko) | 2021-12-30 |
EP3169133A4 (en) | 2018-03-14 |
EP3169132A4 (en) | 2018-03-21 |
CN106576370B (zh) | 2021-04-20 |
EP3169133B1 (en) | 2021-04-21 |
US10362601B2 (en) | 2019-07-23 |
PH12016502587A1 (en) | 2017-04-24 |
EP3169132B1 (en) | 2023-12-06 |
JPWO2016006311A1 (ja) | 2017-05-25 |
BR112017000106A2 (ja) | 2018-01-09 |
JP6536577B2 (ja) | 2019-07-03 |
CA2953541C (en) | 2023-01-31 |
US20170171888A1 (en) | 2017-06-15 |
MY178987A (en) | 2020-10-26 |
US20170202016A1 (en) | 2017-07-13 |
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