WO2018123700A1 - 無線端末装置の通信方法、無線基地局装置の通信方法、無線端末装置、および無線基地局装置 - Google Patents
無線端末装置の通信方法、無線基地局装置の通信方法、無線端末装置、および無線基地局装置 Download PDFInfo
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Definitions
- the present disclosure relates to a communication method for a wireless terminal device, a communication method for a wireless base station device, a wireless terminal device, and a wireless base station device.
- IEEE 802.11 is one of the wireless LAN related standards, and includes, for example, the IEEE 802.11ad standard (hereinafter referred to as “11ad standard”) (for example, see Non-Patent Document 1).
- the procedure for discovering other STAs in order for the terminal (STA) to perform initial connection with the other STAs is called discovery.
- Applications using 60 GHz millimeter wave communication proximity communication
- automatic ticket gates that require high-speed connections
- data downloads at data kiosks and backup wireless lines that replace and / or complement wired networks in data centers
- backup wireless lines that replace and / or complement wired networks in data centers
- IEEE 802.11ad registered trademark
- the conventional STA completes discovery after completing beamforming. In this case, it takes time to complete discovery as much as beam forming is performed.
- One aspect of the present disclosure is to provide an improved communication method for a wireless terminal device, a communication method for a wireless base station device, a wireless terminal device, and a wireless base station device that complete discovery at high speed.
- a communication method of a wireless terminal device is a communication method of a wireless terminal device, and when beamforming training with a wireless base station device is incomplete, a pseudo omnidirectional antenna pattern is used.
- a Probe request frame is transmitted and a Probe response frame for the Probe request frame is received from a radio base station apparatus, the radio base station apparatus is selected as a connection destination, and the Probe response frame is not received from the radio base station apparatus In this case, the beam forming training with the radio base station apparatus is performed.
- discovery can be completed at high speed.
- the figure which shows an example of the whole structure concerning an active scan The figure which shows an example of the procedure in which STA performs an active scan
- the figure which shows an example of the procedure in which STA performs an active scan in several channels The figure which shows an example of the whole structure which concerns on the scenario 1 of Embodiment 1.
- FIG. The figure which shows an example of a mode that a discovery is sequentially performed in the some radio channel based on Embodiment 1.
- FIG. The figure which shows an example of a structure of STA which concerns on Embodiment 1.
- the figure which shows an example of a structure of STA which concerns on the modification 1-1 The figure which shows an example of the procedure which STA performs discovery of another STA based on the modification 1-2.
- the figure which shows an example of a structure of STA which concerns on the modification 1-2 The figure which shows an example of the procedure which STA performs discovery of another STA based on the modification 1-3.
- the figure which shows an example of the format of the PHY packet containing the Probe response frame which concerns on modification 1-3 The figure which shows an example of the whole structure which concerns on the scenario 2 of Embodiment 1.
- FIG. 1 The figure which shows an example of the procedure which STA performs discovery of another STA based on Embodiment 1.
- FIG. 2 The figure which shows an example of the whole structure which concerns on the scenario 1 of Embodiment 2.
- FIG. 2 The figure which shows another example of the format of the Probe request frame which shows a pseudo omnidirectional transmission pattern based on Embodiment 2.
- FIG. 2 The figure which shows an example of a structure of STA which concerns on Embodiment 2.
- FIG. 2 The figure which shows an example of the format of the Probe request frame which concerns on modification 2-4
- the figure which shows an example of the whole structure which concerns on the modification 2-5 The figure which shows an example of the procedure which STA performs discovery of another STA based on the modification 2-5
- the figure which shows an example of the procedure in which STA performs discovery of other STAs The figure which shows an example of the whole structure which concerns on the scenario 3 of Embodiment 2.
- the figure which shows an example of the procedure in which STA performs discovery of other STAs The figure which shows an example of the whole structure which concerns on Embodiment 3.
- FIG. which shows an example of the format of the association request
- requirement frame which shows a pseudo omnidirectional transmission pattern based on Embodiment 3.
- FIG. The figure which shows an example of the format of the association request
- the figure which shows an example of the format of the association response frame containing the field which shows a pseudo omnidirectional transmission pattern based on the modification 3-5 The figure which shows another example of the format of the association response frame containing the field which shows a pseudo omnidirectional transmission pattern based on the modification 3-5
- the figure which shows an example of the format of the association response frame which shows a pseudo omnidirectional transmission pattern based on the modification 3-5 The figure which shows an example of the whole structure which concerns on Embodiment 4.
- FIG. The figure which shows
- FIG. 1 is a diagram illustrating an example of an overall configuration related to active scanning.
- An active scan is one form of discovery in which the STA 100 discovers another STA (for example, the STA 200).
- the STA 100 performs an active scan and finds the STA 200 (Peer STA, STA of the connection destination).
- the STA 200 is, for example, an AP (Access Point), PCP (PBSS Control Point), or an STA that is neither an AP nor a PCP.
- FIG. 2 is a diagram illustrating an example of a procedure in which the STA 100 performs an active scan.
- BI Beacon ⁇ ⁇ ⁇ ⁇ Interval: beacon interval
- BTI Beacon Transmission Interval: beacon transmission interval
- A-BFT Association-BeamForming Training
- DTI Data Transfer
- Interval Data transmission period
- the STA 100 and the STA 200 receive or transmit a transmission sector sweep using the DMG Beacon (DBcn) frame 5001.
- DBcn DMG Beacon
- the STA 100 transmits a plurality of DMG Beacon frames 5001 while switching transmission sectors (transmission beams).
- the STA 200 receives the DMG Beacon frame 5001 and measures reception strength and / or reception quality.
- the STA 100 and the STA 200 transmit or receive a transmission sector sweep using a sector sweep (SSW) frame 5002. Further, the STA 100 and the STA 200 receive or transmit an SSW feedback (SSW-FB) frame 5003.
- SSW sector sweep
- SSW-FB SSW feedback
- the STA 200 switches the transmission sector (transmission beam) for each SSW frame 5002 and transmits the SSW frame 5002.
- the STA 100 receives the SSW frame 5002, measures the reception strength and / or reception quality, and transmits the SSW-FB frame 5003 including the measurement result to the STA 200.
- the STA 200 receives the SSW-FB frame and completes the BFT.
- the STA 100 that performs active scanning determines the best sector (beam suitable for transmission) of the transmission antenna array in the BTI and A-BFT periods.
- the beam indicates antenna directivity.
- the STA 100 transmits a Probe request frame 4001 in the Probe exchange process.
- the STA 200 receives the Probe request frame 4001, the STA 200 transmits an ACK frame 4002, and transmits a Probe response frame 4003.
- the STA 100 receives the ACK frame 4002 from the STA 200, receives the Probe response frame 4003, transmits the ACK frame 4004, and the discovery for the STA 200 is completed.
- the STA 100 performs omni-directional communication. However, since the propagation loss is large in 60 GHz millimeter-wave communication, it may be difficult to make an omnidirectional transmission signal reach the AP / PCP 300.
- the STA 100 obtains information related to a connection destination terminal (for example, the STA 200) and a BSS (Basic Service Set) by a Probe exchange process for exchanging a Probe request frame and a Probe response frame.
- the STA 100 determines a connection destination based on the acquired information. For example, the STA 200 determines whether to connect to the STA 200 or discover another terminal.
- the A-BFT period is shared with other STAs that have received the DMG Beacon frame 5001.
- FIG. 3 is a diagram illustrating an example of a procedure in which the STA 100 performs an active scan in a plurality of channels.
- the STA 100 performs the above-described active scan procedure in a plurality of channels ch1, ch2, and ch3, and a BSS on a channel different from the discovered BSS (and a connected terminal). You may discover.
- the STA 100 performs a transmission sector sweep in the BTI period of the active scan in order to find a distant connection destination terminal that is difficult to find with omnidirectionality and pseudo-omnidirectionality.
- the number of transmission sectors of the STA 100 is large (for example, 128 sectors)
- the time required for the transmission sector sweep in the BTI period increases and the time required for discovery also increases, so the time required for initial connection may increase.
- the number of transmission sectors of the connection destination terminal for example, STA 200
- the time required for transmission sector sweep in the A-BFT period increases, and the time required for discovery also increases.
- the time required for the initial connection may increase.
- the STA 100 and the STA 200 retry the transmission sector sweep, so that the time required for discovery may increase. Along with this, many interference signals may be provided to other STAs.
- the time required for discovery may further increase. Along with this, more interference signals may be provided to other STAs.
- FIG. 4 is a diagram illustrating an example of the overall configuration according to scenario 1 of the first embodiment.
- the STA 100 is an active scan STA.
- the STA 200 is a connection destination STA.
- the STA 200 is, for example, a PCP / AP STA, but may be a non-PCP / AP STA, a non-PCP STA, or a non-AP.
- the STA 100 is a wireless terminal device, for example.
- the STA 200 is, for example, a radio base station device.
- FIG. 5 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to the first embodiment.
- step S101 the STA 100 that performs the active scan performs the transmission antenna array before performing beamforming training with the STA 200, which is indicated by BTI and A-BFT in FIG. 2, in the first beacon interval (BI). 116 (see FIG. 7) is set as a pseudo omnidirectional antenna pattern.
- the STA 100 sets the RA (Receiver Address) field of the Probe request frame 1001 to a broadcast address, and transmits the Probe request frame 1001.
- RA Receiveiver Address
- step S102 the connected STA 200 receives the Probe request frame 1001. If the RA field of the received probe request frame 1001 is a broadcast address, the STA 200 does not perform ACK transmission. That is, steps S103 and S106 are omitted (step S104).
- the STA 200 sets the transmission antenna array 116 to a pseudo omnidirectional antenna pattern even if beamforming training with the STA 100 is not completed. Then, a Probe response frame 1003 including discovery information is transmitted to the STA 100.
- the STA 200 may set the RA field of the Probe response frame 1003 to the address of the STA 100 or a broadcast address.
- step S107 If it is determined in step S107 that the Probe response frame 1003 has been received, the STA 100 determines that the STA 200 exists at a distance (close proximity) where communication can be performed using the pseudo omnidirectional antenna pattern. In step S108, the STA 200 An ACK frame 1004 is transmitted. Next, in step S109, the STA 200 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 200.
- step S107 if it is determined in step S107 that the STA 100 has not received the Probe response frame 1003 from the STA 200, the STA 100 determines that there is no connection destination STA (STA 200 and other STAs not shown) in close proximity. If the STA 100 determines that there is no connection-target STA at a close distance, the STA 100 may perform beamforming training. Details will be described later with reference to FIG.
- FIG. 6 is a diagram illustrating an example of a state in which discovery is sequentially performed in a plurality of wireless channels according to the first embodiment.
- the STA 100 may repeat steps S101 to S109 in a plurality of radio channels in order to find an intended connection destination. For example, as illustrated in FIG. 6, the STA 100 may sequentially perform discovery in a plurality of radio channels (for example, ch1, ch2, and ch3) according to the procedure illustrated in FIG. In this case, when the STA 100 performs discovery according to the procedure shown in FIG. 5 in ch1 and receives the Probe response frame 1003 (S106), the procedure after S107 is interrupted, and the transmission and modulation circuit 114 is transferred to another radio channel.
- the probe request frame 1001 may be transmitted from S101 according to the procedure shown in FIG.
- step S101 the STA 100 that performs the active scan transmits before performing beamforming training with the STA 200 indicated by BTI and A-BFT shown in FIG. 2 in the first beacon interval (BI).
- the antenna array 116 is set to a pseudo omnidirectional antenna pattern.
- the STA 100 sets the RA (Receiver Address) field of the Probe request frame 1001 to the unicast address of the STA 200 and transmits the Probe request frame 1001.
- RA Receiveiver Address
- the STA 100 receives a beacon frame of the STA 200, receives a neighbor list including a unicast address of the STA 200 from another STA, or the STA 200 uses Wi-Fi, NFC, or the like.
- the 60 GHz band MAC address (used by the 11ad standard) is broadcast by another communication means, the unicast address of the STA 200 is known.
- step S102 the connected STA 200 receives the Probe request frame 1001.
- the STA 200 When the STA 200 includes the unicast address of the STA 200 in the RA field of the received Probe response frame 1001, the STA 200 sets the transmission antenna array 116 as a pseudo omni-directional antenna even if beamforming training with the STA 100 is not completed in step S103. The pattern is set and an ACK frame 1002 is transmitted to the STA 100. Next, in step S105, the STA 200 sets the transmission antenna array 116 to a pseudo omnidirectional antenna pattern, and transmits a Probe response frame 1003 including discovery information to the STA 100.
- step S106 the STA 100 determines whether or not the ACK frame 1002 has been received from the STA 200.
- step S107 the STA 100 determines whether or not the Probe response frame 1003 including discovery information has been received from the STA 200.
- STA 100 determines that ACK frame 1002 and Probe response frame 1003 have been received, STA 100 determines that STA 200 exists at a distance (close proximity) that can be communicated using the pseudo omnidirectional antenna pattern, and in step S108 , ACK frame is transmitted to STA200. Next, in step S109, the STA 200 receives an ACK frame. Thereby, the STA 100 completes the discovery of the STA 200.
- the STA 100 determines that there is no STA 200 at a close distance. If the STA 100 determines that there is no STA 200 at a close distance, the STA 100 may transmit a DMG Beacon frame to perform beamforming training. Details will be described later with reference to FIG.
- the STA 100 may transmit a Probe response frame to the STA 200 (not shown).
- the STA 100 sets the RA field of the Probe request frame 1001 to a unicast address (for example, the STA 200), sets the transmit antenna array 116 to a pseudo omnidirectional antenna pattern, and transmits the Probe request frame 1001. .
- the STA 100 determines whether or not the STA of the connection destination set in the RA field (for example, the STA 200) is at a close distance by determining whether or not to receive the ACK frame 1002 and the Probe response frame 1003. Can be determined.
- FIG. 7 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to the first embodiment.
- the STAs 100 and 200 include a host 102, a transmission frame generation circuit 104, a sequencer circuit 106, a selection circuit 108, a MAC frame generation circuit 112, a transmission and modulation circuit 114, a transmission antenna array 116, and a reception antenna array 118.
- the host 102 executes the application, and requests the sequencer circuit to start discovery, request to start initial connection, request to start data communication, input transmission data, and acquire received data.
- the host 102 includes a circuit or a CPU for executing an application, and realizes these functions by executing the application.
- the transmission frame generation circuit 104 generates the frame data F1 of the Probe request frame and the frame data F2 of the Probe response frame, and inputs them to the selection circuit 108.
- the sequencer circuit 106 controls each circuit included in the STA 100 and realizes MAC and PHY functions defined in the 11ad standard and the 11ay standard.
- the sequencer circuit 106 controls each circuit included in the STA 100 so as to execute the procedure of the present disclosure illustrated in FIG. 5 and the like.
- the sequencer circuit 106 determines whether or not to transmit the Probe request frame F1 using a pseudo omnidirectional antenna pattern.
- the sequencer circuit 106 is set so that the schedule circuit 126 determines the transmission timing, and the selection circuit 108 is set so as to select the data of the Probe request frame F1.
- the sequencer circuit 106 sets the MAC frame generation circuit 112 to generate the MAC frame of the Probe request frame F1, and the transmission and modulation circuit 114 sets the Probe request frame F1 according to the transmission timing determined by the schedule circuit 126.
- a parameter for example, MCS
- the sequencer circuit 106 sets the transmission antenna array 116 to a pseudo omnidirectional antenna pattern.
- the sequencer circuit 106 processes the received probe request frame F1 and probe response frame F2. For example, the sequencer circuit 106 of the STA 100 determines whether or not the address of the RA field of the received frame is the address of the STA 100, and determines whether or not to transmit an ACK.
- the selection circuit 108 selects frame data to be included in the MAC frame and transfers it to the MAC frame generation circuit 112.
- the MAC frame generation circuit 112 generates a MAC frame from the frame data based on the MAC specifications of the 11ad standard and the 11ay standard.
- the transmission and modulation circuit 114 performs encoding and modulation based on the PHY specifications of the 11ad standard and the 11ay standard, and generates a PHY packet signal.
- the transmission antenna array 116 transmits a PHY packet signal.
- the transmit antenna array 116 may include an RF circuit. Based on the control from the sequencer circuit 106, the transmit antenna array 116 controls directivity, for example, setting to pseudo omnidirectional, or a beam corresponding to the sector ID specified by the sequencer circuit 106 (related to the transmit beam direction). Configure forming transmission settings.
- the receiving antenna array 118 receives a radio signal and generates a received PHY packet signal.
- the receive antenna array 118 may include an RF circuit. Based on the control from the sequencer circuit 106, the receiving antenna array 118 is controlled by directivity, for example, set to pseudo omnidirectional, or a beam corresponding to the sector ID specified by the sequencer circuit 106 (related to the transmission beam direction). Configure forming reception.
- the reception and demodulation circuit 122 demodulates and decodes the PHY packet signal based on the PHY specifications of the 11ad standard and the 11ay standard, and generates reception MAC frame data.
- the MAC frame receiving circuit 124 analyzes received MAC frame data based on the 11ad standard and 11ay standard MAC specifications, generates received data, and inputs the received data to the sequencer circuit 106.
- the schedule circuit 126 determines the timing of the transmission period and the reception period.
- the STA 100 omits the beamforming training by BTI and A-BFT, regardless of the address set in the RA field, and the Probe response frame of the connection-destination STA 200 existing at a close distance. Since 1003 can be received, the time required to complete discovery can be reduced.
- the STA 100 sets the transmitting antenna array 116 to a pseudo omnidirectional antenna pattern, sets the RA field to the unicast address of the STA 200, and transmits the Probe request frame, whether or not to receive the ACK frame is determined. Accordingly, it can be determined whether or not the STA 200 is at a close distance. As a result, the STA 100 can perform near field communication with the STA 200, and can select a high MCS (Modulation & Coding? Scheme) to increase the data rate.
- MCS Modulation & Coding? Scheme
- a high MCS may be used from the beginning of communication. Thereby, the data rate of near field communication can be further increased.
- transmission power may be reduced by performing transmission using a smaller number of antenna elements. Further, the transmission power may be lowered by changing the setting of an amplifier (not shown). As a result, interference with other STAs (not shown) can be reduced, the risk of eavesdropping can be reduced, and safe communication can be performed.
- the connected STA 200 when receiving the Probe request frame 1001 in step S102 shown in FIG. 5, the connected STA 200 receives the received quality, for example, RSSI (Recieved Signal Strength Indicator) and SINR (Signal to Interference and Noise Ratio, signal-to-interference and noise power ratio) may be measured.
- RSSI Recieved Signal Strength Indicator
- SINR Signal to Interference and Noise Ratio, signal-to-interference and noise power ratio
- the STA 200 may determine whether or not a value indicating the measured reception quality exceeds a predetermined threshold value. If the value indicating the measured reception quality exceeds the threshold, the STA 200 may transmit the Probe response frame 1003 in step S105. On the other hand, if the value indicating the measured reception quality is below the threshold, the STA 200 determines that the STA 100 is not suitable for communication (proximity communication) using the pseudo omnidirectional antenna pattern, and even if transmission of the Probe response frame 1003 is stopped. Good.
- FIG. 8 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to Modification 1-1.
- the reception and demodulation circuit 122 may include a reception quality measurement circuit 122a.
- the reception quality measurement circuit 122a may measure the reception quality of the Probe request frame 1001.
- the reception and demodulation circuit 122 outputs the reception quality measured by the reception quality measurement circuit 122a to the sequencer circuit 106 as reception quality information.
- the STA 200 may transmit the header of the PHY packet including the ACK frame 1002 including a value indicating the reception quality (RSSI or SINR). Further, the STA 200 may determine whether or not to send the probe response frame 1003 in step S105 based on a value indicating the reception quality.
- RSSI reception quality
- SINR reception quality
- the STA 200 may set the RA field of the Probe request frame 1001 as a broadcast address and transmit the broadcast address.
- Modification 1-1-1 when a plurality of connection destination STAs are in close proximity, a connection destination STA exceeding the reception quality threshold responds, and a STA that does not exceed the reception quality threshold does not respond Therefore, unnecessary interference can be reduced.
- FIG. 9A is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to Modification 1-2.
- step S101a the STA 100 transmits a Probe request frame 1021 to which a TRN-R field is added instead of the Probe request frame 1001 using a pseudo omnidirectional antenna pattern.
- FIG. 9B is a diagram showing an example of the format of the PHY packet 1011 including the Probe request frame 1021 according to Modification 1-2.
- the preamble includes STF (Short Training Field) and CEF (Channel Estimation Field) defined in the 11ad standard.
- the PHY header is defined in the 11ad standard and includes information related to payload encoding and modulation, and information related to the type and length of the AGC field and the TRN field.
- the payload is a signal obtained by encoding and modulating MAC frame data (for example, Probe request frame 1021).
- the AGC (Automatic Gain Control) field is used to determine a reception gain that is set when receiving a TRN field described later.
- An AGC (Automatic Gain Control) field includes one or more AGC subfields, and the AGC subfield is a signal sequence of a known pattern.
- the TRN (Training) field may include one or more TRN-R subfields.
- the TRN-R subfield is a signal sequence of a known pattern and is used for beamforming training of the receiving antenna.
- a TRN field including the TRN-R subfield is referred to as a TRN-R field.
- the TRN (Training) field includes a CEF field.
- the STA 200 receives the Probe request frame 1021 with the TRN-R field added.
- the STA 200 sets the receiving antenna to a pseudo omnidirectional antenna pattern and performs standby, and receives a preamble, a PHY header, and a payload of a Probe request frame 1021 composed of PHY packets using the pseudo omnidirectional antenna pattern.
- the STA 200 decodes the PHY header, information on the type of the TRN field (eg, indicating that the TRN-R subfield is included), and information on the length of the AGC field and the TRN field (eg, the AGC subfield and the TRN) -The repetition number of R subfield is 4).
- the STA 200 receives the AGC subfield and the TRN-R subfield by changing the reception antenna sector (directional antenna pattern) for each AGC subfield and for each TRN-R subfield, and receives the reception quality for each reception antenna sector. May be used to perform beamforming training to determine the best sector of the receiving antenna array 118 of the receiving antenna array 118 of the STA 200 for communicating with the STA 100.
- the STA 200 may determine the best sector of the transmission antenna array 116 based on the determined best sector of the reception antenna array 118.
- the communication apparatus (STA) having antenna pattern reciprocity refers to, for example, the transmission antenna array and the reception antenna so that the best sector ID of the transmission antenna array 116 is the same as the best sector ID of the reception antenna array 118. It is a STA that controls the array.
- a communication apparatus (STA) having antenna pattern reciprocity includes a transmission / reception antenna array in which a transmission antenna array and a reception antenna array are shared, and is configured so that a transmission directional antenna pattern and a reception directional antenna pattern are similar. May be.
- the STA 100 Since the increase in delay (transmission time) due to the addition of the TRN-R field to the Probe request frame by the STA 100 is smaller than when performing a sector sweep in the BTI and A-BFT and / or DTI, the STA 100 does not perform discovery. The time required can be shortened.
- the STA 200 may transmit the ACK frame 1002 using the best sector of the transmission antenna array 116 determined in the reception of the Probe request frame 1021 with the TRN-R field added. Thereby, more robust reception is realized.
- the STA 200 receives the Probe request frame 1001, but the STA 100 The ACK frame 1002 is not received.
- the STA 200 receives the Probe request frame 1001, but the STA 100 does not receive the ACK frame 1002. In these cases, it is difficult for the STA 100 to detect that the STA 200 is at a close distance.
- the STA 200 since the STA 200 transmits the ACK frame 1002 using the best sector of the transmission antenna array 116, the transmission power intensity is higher than that in the case of using the pseudo omnidirectional antenna pattern. large. Therefore, when the transmission power in the pseudo omnidirectional antenna pattern of STA200 is lower than the transmission power in the pseudo omnidirectional antenna pattern of STA100, and the reception sensitivity in the pseudo omnidirectional antenna pattern of STA100 is a pseudo omnidirectional antenna of STA200 Even when the reception sensitivity in the pattern is lower, the STA 100 has a higher probability of receiving the ACK frame. Thereby, the STA 100 can detect that the STA 200 is at a close distance.
- step S105a the STA 200 transmits the Probe response frame 1003 using the best sector of the transmission antenna array 116 determined in the reception of the Probe request frame 1021 to which the TRN-R field is added.
- Steps S106 to S109 are the same as those described above with reference to FIG.
- FIG. 10 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to Modification 1-2.
- the transmission and modulation circuit 114 includes a transmission TRN addition circuit 114b.
- Transmission TRN addition circuit 114b generates signals of the AGC field and the TRN field.
- the transmission and modulation circuit 114 encodes and modulates MAC frame data (for example, a Probe response frame), adds the signals of the AGC field and the TRN field to the generated PHY frame, and inputs them to the transmission antenna array 116.
- the transmission and modulation circuit 114 of the STA 100 illustrated in FIG. 9A generates a Probe request frame 1021 to which signals of the AGC field and the TRN field are added.
- the reception and demodulation circuit 122 includes a reception TRN processing circuit 122b.
- the reception TRN processing circuit 122b measures reception quality (for example, RSSI and SNR) for each TRN-R subfield added to the reception PHY frame, and notifies the sequencer circuit 106 of the reception quality.
- reception quality for example, RSSI and SNR
- the reception and demodulation circuit 122b of the STA 200 shown in FIG. 9A measures the reception quality for each TRN-R subfield added to the received Probe request frame 1021.
- the sequencer circuit 106 determines the best sector of the reception antenna array 118 based on the reception quality for each TRN-R field measured by the reception TRN processing circuit 122b.
- the sequencer circuit 106 may determine the best sector of the transmission antenna array 116 based on the reception quality for each reception antenna sector. For example, the sequencer circuit 106 of the STA 200 shown in FIG. 9A determines whether to transmit the probe response frame 1003 using the pseudo omnidirectional antenna pattern or the best sector of the transmission antenna array 116.
- the transmission antenna array 116 is set.
- the transmission antenna array 118 transmits using a pseudo omnidirectional antenna pattern or transmits a frame and a TRN-R subfield using the best sector of the transmission antenna array 116 according to the configuration set by the sequencer circuit 106. .
- the STA 100 transmits the Probe request frame 1021 with the TRN-R field added in the active scan. Therefore, the STA 100 can receive the probe response frame 1003 of the connection-destination STA 200 at a close distance by omitting the beamforming training by BTI and A-BFT, and shorten the time required for completing discovery. can do.
- the STA 200 determines the best sector of the reception antenna array 118 and the best sector of the transmission antenna array 116 using the TRN-R field added to the Probe request frame 1021, and uses the best sector of the transmission antenna array 116 to ACK.
- the frame and the probe response frame are transmitted to the STA 100. Therefore, the probability that the STA 100 completes the discovery of the STA 200 by omitting the beamforming training by BTI and A-BFT is increased.
- FIG. 11 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to Modification 1-3.
- Steps S101 to S103 are the same as those described above with reference to FIG.
- step S106 the STA 100 determines whether or not the ACK frame 1002 has been received from the STA 200.
- Step S105b the STA 200 transmits a Probe response frame 1033 with the TRN-R field added.
- step S107b the STA 100 determines whether or not the STA 100 has received the Probe response frame 1033 with the TRN-R field added.
- the STA 100 determines that it has received the Probe response frame 1033 with the ACK frame 1002 and the TRN-R field added, it further performs the following processing.
- the STA 100 when receiving the Probe response frame 1033, the STA 100 performs reception beamforming training by switching the reception antenna sector for each TRN-R subfield and measuring reception quality for each switched reception antenna sector.
- the best sector of the receive antenna array 118 may be determined.
- the STA 100 may determine the best sector of the transmission antenna array 116 used for subsequent transmission based on the reception quality for each TRN-R subfield.
- step S107b the best sector of the transmission antenna array 116 is determined as described above, and the STA 100 transmits the ACK frame 1004 using the determined best sector of the transmission antenna array 116.
- step S108b the STA 100 transmits an ACK frame 1004 to the STA 200.
- step S109 the STA 200 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 200.
- the STA 100 may transmit an association request frame (not shown) to the STA 200 and perform an initial connection process.
- the probe request frame and the association request frame for initial connection may be transmitted using the best sector of the transmit antenna array 116.
- the transmission and modulation circuit 114 of the STA 200 includes a transmission TRN addition circuit 114b as shown in FIG.
- the sequencer circuit 106 of the STA 200 determines whether or not to add the TRN-R field to the Probe response frame F2 and the length of the TRN-R field.
- the STA 100 may transmit the probe request frame F1 including information on the number of reception antenna sectors, and the STA 200 transmits the probe request frame F2 based on the information on the number of reception antenna sectors of the STA 100 included in the Probe request frame F1.
- the length of the TRN-R field to be added to may be determined.
- the reception and demodulation circuit 122 of the STA 100 includes a reception TRN processing circuit 122b as shown in FIG.
- the sequencer circuit 106 of the STA 100 determines the best sector of the reception antenna array 118 based on the reception quality for each TRN-R field measured by the reception TRN processing circuit 122b. Further, when the STA 100 has antenna pattern reciprocity, the STA 100 determines the best sector of the transmission antenna array 116 based on the determined best sector of the reception antenna array 118.
- FIG. 12 is a diagram showing an example of the format of a PHY packet including a Probe response frame 1033 according to Modification 1-3.
- the format shown in FIG. 12 corresponds to a PHY packet format including the Probe request frame 1021 shown in FIG. 9B, in which the Probe request frame 1021 is replaced with a Probe response frame 1033.
- the STA 100 can receive the probe response frame 1033 of the connection-destination STA 200 existing at a close distance by omitting the beamforming training by BTI and A-BFT. Furthermore, since the STA 100 can determine the best sector of the transmission and reception antenna array 118 used for communication with the STA 200 based on the received Probe response frame 1033, the time required for completing discovery can be shortened, and the initial connection Can be shortened.
- FIG. 13 is a diagram illustrating an example of the overall configuration according to scenario 2 of the first embodiment.
- the STA 100 is an active scan STA.
- the STAs 200 and 300 are connection destination STAs.
- the STAs 200 and 300 are, for example, PCP / AP STAs, but may be non-PCP / AP STAs, non-PCP STAs, or non-APs.
- the STA 100 is a wireless terminal device, for example.
- the STAs 200 and 300 are, for example, radio base station apparatuses.
- FIG. 14 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of other STAs 200 and 300 according to the first embodiment.
- STA 100 receives ACK frame 1002 and Probe response frame 1003 in steps S106 and S107 shown in FIG.
- the STA 100 may determine that there is no connection-destination STA in a nearby position in the currently used radio channel, and may perform beamforming training in BTI and A-BFT.
- the STA 100 may determine whether to perform proximity communication according to the type of application that requests communication. For example, when the STA 100 executes an application for downloading data from a data kiosk, the STA 100 performs the procedure shown in FIG. 5, while when connecting to a public wireless LAN access point, The procedure shown in FIG.
- the data kiosk is a device that, for example, downloads moving image or book data data to the smartphone when the user brings the smartphone close to the data kiosk.
- the STA 100 may not receive the Probe response frame 1003 transmitted from STAs that do not exist in close proximity (for example, the STA 200 and the STA 300 illustrated in FIG. 13). Therefore, the STA 200 and the STA 300 also transmit a probe request frame 1041 transmitted with a directional antenna pattern for beamforming in order to avoid unnecessary transmission of power consuming frames and interference with other STAs (not shown). You do not have to respond to When the STA 100 executes an application requesting proximity communication, the probe response frame from the STA 200 and the STA 300 is not transmitted to reduce the occurrence of interference to other STAs in order to perform the procedure illustrated in FIG. Can do.
- the STA 100 determines that there is no connection-destination STA existing at a close distance in the currently used radio channel, and determines to perform beamforming training in BTI and A-BFT, the STA 100 is shown in FIG. Implement the procedure. A procedure in which the STA 100 performs beamforming training with the STA 300 and then completes discovery of the STA 300 will be described below.
- step S100c the STA 100 performs beamforming training in BTI and A-BFT. For example, when the STA 300 receives the SSW-FB frame 5003 from the STA 100, the STA 100 completes beamforming training with the STA 300.
- step S101c the STA 100 that has completed the beam forming training with the STA 300 sets an RA field in the unicast address indicating the STA 300, and transmits a Probe request frame 1041 with a directional antenna pattern for beam forming.
- step S102c when the STA 300 receives the probe request frame 1041, the STA 300 sets the transmission antenna array 116 as the best sector based on the information on the best sector of the transmission antenna array 116 included in the SSW-FB frame 5003 received in the A-BFT. Set.
- step S103c the STA 300 transmits an ACK frame 1002.
- step S105c the STA 300 transmits a Probe response frame 1003 to the STA 100.
- the STA 100 determines whether or not the ACK frame 1002 is received in step S106c.
- the STA 100 determines whether or not the Probe response frame 1003 has been received in step S107c.
- the STA 100 determines that the ACK frame 1002 is received in step S106c and determines that the Probe response frame 1003 is received in step S107c, the STA 100 includes the transmission antenna array 116 included in the SSW-FB frame 5003 received in the A-BFT.
- the transmitting antenna array 116 is set as the best sector based on the information on the best sector.
- step S108c the STA 100 transmits an ACK frame 1004.
- step S109c the STA 300 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 300.
- the STA for example, the STA 200
- the STA 200 that does not complete beamforming in BTI and A-BFT receives the Probe request frame 1041 in step S102d
- the RA field address is different from the STA 200 unicast address.
- the probe response frame 1003 is not transmitted.
- the STA 200 executes an application using proximity communication (for example, when the STA 200 is a data kiosk) will be described.
- the STA 200 preferably reduces interference with the STA 300 and other STAs (not shown).
- the STA 200 desirably transmits the Probe response frame 1003, and when transmitted using a beamforming directional antenna pattern. Does not transmit the probe response frame 1003. Even if a probe response frame 1003 corresponding to a probe request frame 1041 transmitted with a beamforming directional antenna pattern is transmitted with a pseudo omnidirectional antenna, there is a high possibility that a probe response frame will not be received, which wastes devices and channel resources. Can be.
- the STA 200 determines whether the received Probe request frame is transmitted using a pseudo omnidirectional antenna or a beamforming directional antenna pattern.
- the STA 100 when the STA 100 transmits the Probe request frame 1041 using the beamforming directional antenna pattern, the STA 100 includes the unicast address of the connection-destination STA in the Probe request frame 1041.
- the STA 100 when transmitting the Probe request frame 1041 using a pseudo omnidirectional antenna, the STA 100 does not include the unicast address of the destination STA, but includes, for example, a broadcast address in the Probe request frame 1041 unlike FIG.
- the STA 200 when the RA field of the received probe request frame 1041 is set to the unicast address of the STA 200, the STA 200 transmits an ACK frame 1002 and a probe response frame 1003 using a beamforming directional antenna pattern. To do.
- the STA 200 when the RA field of the received Probe request frame 1041 is set to the broadcast address, the STA 200 transmits an ACK frame 1002 and a Probe response frame 1003 using a pseudo omnidirectional antenna pattern, unlike FIG.
- STA 200 responds to Probe request frame 1041 transmitted by the pseudo omni-directional antenna by transmitting Probe response frame 1003 using the pseudo omni-directional antenna.
- Scenario 1 can be implemented, and as shown in FIG. 14, a Probe response frame 1003 is transmitted with a beamforming directional antenna pattern in response to a Probe request frame 1041 transmitted with a beamforming directional antenna pattern.
- scenario 2 of the first embodiment that responds can be implemented. That is, the connected STAs (STA 200 and STA 300) can respond with a transmission method corresponding to the transmission method of the STA 100, and can reduce interference with other STAs.
- the STA 100 may perform the procedure of FIG. 14 when executing an application that does not use proximity communication.
- the RA field of the Probe request frame is set to a unicast address, it is possible to avoid an unintended STA (STA 200) present at a close distance from transmitting a Probe response frame, and to other STAs. Interference can be reduced.
- the STA 100 may determine whether to perform proximity communication according to the type of application that requests communication, and may determine whether to perform the procedure of FIG. 5 or the procedure of FIG. As a result, the STA 100 can obtain a response from the connection-destination STA (STA 200) corresponding to the application type.
- STA 200 connection-destination STA
- FIG. 15 is a diagram illustrating an example of the overall configuration according to scenario 1 of the second embodiment.
- the STA 100 is an active scan STA.
- the STA 200 is a connection destination STA.
- the STA 200 is, for example, a PCP / AP STA, but may be a non-PCP / AP STA, a non-PCP STA, or a non-AP.
- the STA 100 is a wireless terminal device, for example.
- the STA 200 is, for example, a radio base station device.
- FIG. 16 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to the second embodiment.
- the STA 100 sets the QO TX field included in the Probe request frame 2001 to 0 in step S201, unlike FIG. Transmit using the best sector of the transmit antenna array determined by beamforming training.
- the STA 100 may set the RA field of the Probe request frame 2001 to a unicast address indicating the STA 200 or a broadcast address.
- FIG. 17 is a diagram illustrating an example of a format of a Probe request frame 2001 including a QO TX field indicating a pseudo omnidirectional transmission pattern according to the second embodiment.
- a field or subfield having no function in the 11ad standard is a Quasi-omni TX field or a Quasi-omni TX subfield (hereinafter referred to as Quasi-omni).
- the Quasi-omni TX field may be included in the Probe request frame 2001 by replacing it with a -omni TX field or a QO TX field.
- the + HTC / Order subfield of the Frame Control field shown in FIG. 17 is not referenced in the 11ad standard and the 11ay standard. Therefore, the STA 100 and the STA 200 may replace the + HTC / Order subfield with the Quasi-omni TX field and use it as the Quasi-omni TX field.
- the + HTC / Order subfield may be replaced with a Quasi-omni TX field.
- the Quasi-omni ⁇ ⁇ ⁇ ⁇ ⁇ TX field is “1”, the frame is transmitted using the pseudo omnidirectional transmission pattern, and when it is “0”, the frame is not transmitted using the pseudo omnidirectional transmission pattern.
- FIG. 18 is a diagram illustrating another example of the format of the Probe request frame 2001 including the QO TX (Quasi-omni TX) field indicating the pseudo omnidirectional transmission pattern according to the second embodiment.
- QO TX Quad-omni TX
- Control element an element different from the element prescribed
- body Probe
- body Probe request frame 2001 main body
- TX Fields may be included.
- a Quasi-omni ⁇ ⁇ ⁇ ⁇ ⁇ TX field may be added to any element included in the main body of the 11ad standard Probe request frame 2001.
- FIG. 19 is a diagram illustrating another example of the format of the Probe request frame 2001 indicating the pseudo omnidirectional transmission pattern according to the second embodiment.
- an element for example, Quasi-omni Indicator element
- Quasi-omni Indicator element that is different from any of the probe request frame body and the elements specified in the 11ad standard is added, and whether or not a Quasi-omni Indicator element is included. Accordingly, the value of Quasi-omni TX (field) may be notified.
- including the Quasi-omni Indicator element is equivalent to setting the value of the Quasi-omni TX field to 1, and not including the Quasi-omni Indicator element sets the value of the Quasi-omni TX field to 0. Is equivalent to
- steps S202 to S203 are the same as the processing contents of S102 to S103 described above with reference to FIG.
- step S204 the STA 200 checks the value of the Quasi-omni TX field of the received Probe request frame 2001.
- step S204 If the value of the Quasi-omni TX field checked in step S204 is 1, the STA 200 uses the pseudo omni-directional antenna pattern in step S205 as in step S105 shown in FIG. 1003 is transmitted.
- step S206 the STA 100 determines whether or not the ACK frame 1002 has been received from the STA 200.
- step S207 the STA 100 determines whether or not a Probe response frame 1003 including discovery information has been received from the STA 200.
- step S206 If it is determined in step S206 that the ACK frame 1002 has been received and it is determined in step S207 that the Probe response frame 1003 has been received, the STA 100 transmits an ACK frame 1004 using the pseudo omnidirectional antenna pattern in step S208. To respond. Next, in step S209, the STA 200 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 200.
- the STA 200 moves the transmit antenna array 116 to the STA (eg, STA 100) indicated by the source address of the Probe request frame 2001 in step S205.
- the probe response frame 1003 is transmitted with the best sector in the transmission. Note that the STA 200 does not transmit the Probe response frame 1003 when receiving the Probe request frame 2001 in which the value of the Quasi-omni TX field is 0 from an STA that has not completed the beamforming training (for example, the STA 400 not illustrated).
- the STA 100 that has received the Probe response frame 1004 including discovery information in step S207 responds by transmitting an ACK frame 1004 using a beamforming directional antenna pattern in step S208.
- the STA 200 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 200.
- the STA 100 may repeat steps S201 to S209 on a plurality of channels in order to find an intended connection destination.
- FIG. 20 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to the second embodiment.
- the transmission frame generation circuit 104a generates the value F3 of the Quasi-omni TX field in addition to the Probe request frame F1 and the Probe response frame F2 shown in FIG.
- the MAC frame generation circuit 112 combines the data of the Probe request frame F1 with the value F3 of the Quasi-omni TX field to generate MAC frame data including the Probe request frame F1.
- the sequencer circuit 106 has the function described above with reference to FIG. 7, and further, when transmitting the Probe request frame F1 or the Probe response frame F2, the sequencer circuit 106 includes a selection circuit 108 so that the Quasi-omniomTX field is included in the MAC frame. Control.
- the same effect as in the first embodiment can be obtained. Furthermore, according to the second embodiment, since STA 100 transmits a Probe request frame including a Quasi-omni TX field, STA 200 determines whether or not the received Probe request frame is transmitted using a pseudo omnidirectional antenna pattern. Can be determined. Therefore, if beamforming training with the STA 100 is not completed, the STA 200 transmits a Probe response frame with a pseudo omni-directional antenna pattern according to the value of the Quasi-omni TX field of the received Probe request frame. Can be determined.
- the STA 100 can receive the Probe response frame from the intended STA (whether or not it exists at a close distance), and can suppress the transmission of the Probe response frame from the unintended STA. Can be reduced.
- the modified example 2-1 can be considered in the same manner as the modified example 1-1 for the first embodiment.
- the STA 200 may measure the reception quality (for example, RSSI, SINR) of the probe request frame 2001.
- the reception quality for example, RSSI, SINR
- step S204 in addition to checking the value of the Quasi-omni TX field of the received Probe request frame 2001, the STA 200 determines whether or not the value indicating the reception quality of the Probe request frame 2001 exceeds a predetermined threshold. judge.
- step S205 the STA 200 uses the pseudo omnidirectional antenna pattern to send a probe response.
- a frame 1003 is transmitted.
- the STA 200 causes the STA 100 to communicate with the pseudo omnidirectional antenna pattern.
- the transmission of the Probe response frame 1003 may be stopped by determining that it is not suitable for (proximity communication).
- step S205 the STA 200 determines that the STA 100 does not perform near field communication, and sets the transmit antenna array 116 to Probe regardless of the reception quality.
- the probe response frame 1003 is transmitted by setting the best sector in the transmission to the STA (for example, the STA 100) indicated by the transmission source address of the request frame 2001.
- the modified example 2-1-1 can be considered in the same manner as the modified example 1-1-1 with respect to the first embodiment.
- the STA 200 may transmit the header of the PHY packet including the ACK frame 1002 including a value indicating the reception quality (RSSI or SINR). Further, the STA 200 may determine whether or not to send the Probe response frame 1003 in step S205 based on the value indicating the reception quality.
- RSSI reception quality
- SINR reception quality
- the STA 200 may set and send the destination of the Probe request frame 2001 as a broadcast address.
- connection-destination STAs exceeding the reception quality threshold respond, and STAs that do not exceed the reception quality threshold do not respond, thereby reducing unnecessary interference.
- the modified example 2-2 can be considered in the same manner as the modified example 1-2 for the first embodiment. This will be described with reference to FIG.
- the STA 100 may transmit the Probe request frame 2001 with the TRN-R field added in a pseudo omni-directional antenna pattern in step S201.
- the STA 200 receives the Probe request frame 2001 with the TRN-R field added.
- the STA 200 performs beamforming training by measuring the reception quality for each reception antenna sector, and determines the best sector of the reception antenna array 118 of the STA 200 for communicating with the STA 100. Also good.
- the STA 200 may determine the best sector of the transmit antenna array 116 based on the determined best sector of the receive antenna array 118.
- the STA 200 may transmit the ACK frame 1002 using the best sector of the transmission antenna array 116 determined in the reception of the Probe request frame 2001 with the TRN-R field added.
- the STA 200 may transmit the probe response frame 1003 using the best sector of the transmission antenna array 116 determined in the reception of the probe request frame 1021 to which the TRN-R field is added.
- the modified example 2-3 can be considered in the same manner as the modified example 1-3 for the first embodiment. This will be described with reference to FIG.
- step S202 when the STA 200 receives a probe request frame 2001 from an STA that has not completed beamforming training (for example, the STA 100), in step S205, the probe response frame to which the TRN-R field is added. 1003 may be transmitted.
- step S207 when the STA 100 receives the Probe response frame 1003 to which the TRN-R field is added, the STA 100 measures the reception quality while switching the reception antenna sector for each TRN-R subfield, and receives beamforming Training may be performed to determine the best sector of the receive antenna array 118.
- the STA 100 may determine the best sector of the transmission antenna array 116 used for subsequent transmission based on the reception quality for each TRN-R subfield.
- the STA 100 may transmit the ACK frame 1004 using the determined best sector of the transmission antenna array 116. After transmitting the ACK frame 1004, the STA 100 may transmit an association request frame (not shown) to the STA 200 and perform an initial connection process. In step S209, the STA 200 receives the ACK frame 1004.
- the STA 100 can omit the beamforming training using the TRN-R field because the best sector of the transmission antenna array 116 is known. Therefore, even when the value of the Quasi-omni TX field of the received Probe request frame 2001 is 0, the time required for discovery can be shortened.
- the STA 200 adds a TRN-R to the Probe response frame 1003 in step S206. Transmission may be performed without adding a field.
- step S201 the STA 100 adds a probe request information in which transmission power (EIRP: equivalent isotropically radiated power) and reception antenna gain information of a pseudo omnidirectional antenna are added to the probe request frame 2001.
- the frame 2001 may be transmitted.
- FIG. 21 is a diagram showing an example of the format of the Probe request frame 2001 according to Modification 2-4.
- the Quasi-omni indicator field shown in FIG. 18 includes the Quasi-omni indicator field, whereas the Quasi-omni indicator field shown in FIG. 21 further includes the TX EIRP field and the Quasi-omni RX antenna gain. Contains fields.
- the TX EIRP field includes the transmission power (EIRP) value of the STA 100.
- the Quasi-omni RX antenna gain field includes the value of the receiving antenna gain of the STA 100 pseudo omnidirectional antenna.
- step S204 the propagation loss between the STA 100 and the STA 200 is calculated by the following equation (1). Also good.
- Equation (1) (EIRP of STA 100) is a value (unit: dBm) corresponding to the value included in the EIRP field of the received Probe request frame 2001.
- (Received signal power) is the received power (unit: dBm) measured when the Probe request frame 2001 is received.
- (Receiving antenna gain of STA 200) is a value (unit: dBi) of a receiving antenna gain of the pseudo omnidirectional antenna of STA 200.
- the STA 200 may use the value of the reception antenna gain held in the sequencer circuit 106.
- the STA 200 uses the calculated propagation loss value to more accurately determine whether a frame (for example, a Probe response frame 1003) transmitted using a pseudo omnidirectional antenna reaches the STA 100 (can be received by the STA 100). Can be judged. For example, when the following mathematical formula (2) is satisfied, it may be determined that the frame reaches the STA 100.
- (Reception sensitivity) is a value (unit: dBm) determined in the 11ad standard according to the MCS of the Probe response frame 1003.
- the reception sensitivity of the MCS0 is ⁇ 78 dBm.
- Equation (2) a value (unit: dBm) known to the STA 200 may be used as (EIRP of the STA 200).
- Equation (2) (Receiving antenna gain of STA 100) is a value (unit: dBm) corresponding to a value included in the Quasi-omni RX antenna gain field of the received Probe request frame 2001.
- the STA 200 determines that the Probe response frame 1003 reaches the STA 100, and transmits the Probe response frame 1003 using the pseudo omnidirectional antenna pattern in Step S205 illustrated in FIG. .
- the Quasi-omni TX field of the Probe request frame 2001 is Can be omitted.
- the STA 100 may determine whether the Probe request frame 2001 is transmitted by the pseudo omnidirectional antenna pattern according to whether the EIRP value of the STA 100 exceeds a threshold value.
- FIG. 22 is a diagram illustrating an example of a Quasi-omni Indicator element according to Modification 2-4.
- the Quasi-omni Indicator element shown in FIG. 22 includes an EIRP field and a Quasi-omni RX antenna gain field.
- the format of the Probe request frame 2001 shown in FIG. 21 includes the Quasi-omniomindicator field shown in FIG. 19 including the EIRP field and the Quasi-omni RX antenna gain field.
- the Quasi-omni control element shown in FIG. 18 and / or the Quasi-omni indicator field may include the Quasi-omni RX antenna gain field shown in FIG.
- the elements and fields including the EIRP field and the Quasi-omni RX antenna gain field are not particularly limited.
- FIG. 23 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to Modification 2-4.
- the transmission frame generation circuit 104b includes a circuit that generates a value F4 of the Quasi-omni / indicator field output to the selection circuit 108 together with the probe request frame F1 or the probe response frame F2 in the transmission frame generation circuit 104 illustrated in FIG. It is added.
- the Quasi-omni indicator field includes an EIRP field and a Quasi-omni RX antenna gain field.
- the MAC frame generation circuit 112 combines the data of the Probe request frame F1 and the value F4 of the Quasi-omni indicator field to generate MAC frame data including the Probe request frame F1.
- the sequencer circuit 106 when transmitting the Probe request frame 2001, sets the quasi-omniQuindicator field including the EIRP field and the Quasi-omni RX antenna gain field to the MAC.
- the selection circuit 108 is controlled to be included in the frame.
- FIG. 23 Other components shown in FIG. 23 are the same as those described above with reference to FIG. 23 are the same as those described above with reference to FIG. 23.
- the STA 200 can more accurately determine whether or not the Probe response frame 1003 transmitted using the pseudo omni-directional antenna reaches the STA 100.
- the response frame 1003 is not transmitted. Therefore, unnecessary transmission can be further suppressed and waste of devices and channel resources can be reduced as compared with the case where it is determined whether or not to transmit the Probe response frame 1003 according to the value of the Quasi-omni TX field. it can.
- FIG. 24 is a diagram illustrating an example of an overall configuration according to Modification 2-5.
- the STAs 100 and 300 are active scan STAs.
- the STA 200 is a connection destination STA.
- the STA 200 is, for example, a PCP / AP STA, but may be a non-PCP / AP STA, a non-PCP STA, or a non-AP.
- the STAs 100 and 300 are wireless terminal devices, for example.
- the STA 200 is, for example, a radio base station device.
- FIG. 25 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to the modification 2-5.
- the STA 100 and the STA 200 exist at a close distance, and another STA (STA 300) exists at a distance close to the STA 200.
- Steps S201 to S203 shown in FIG. 25 are the same as steps S201 to S203 shown in FIG.
- the STA 200 determines whether or not to transmit the probe response frame 2053 using the pseudo omnidirectional antenna.
- the STA 200 is quasi-omni-directional based on whether the Probe request frame 2001 received in step S202 includes a unicast address addressed to another STA, similar to that described above with reference to FIG. It is determined whether or not to transmit the probe response frame 2053 using the directional antenna.
- the Probe response frame 2053 using a pseudo omnidirectional antenna. Decide whether to send In another example, in the same manner as described above with reference to FIG. 21, based on the Quasi-omniomindicator of the Probe request frame 2001 received in Step S202, the Probe response frame 2053 is used using a pseudo omnidirectional antenna. Decide whether to send.
- the STA 200 transmits the probe response frame 2053 in step S205e.
- the Probe response frame 2053 includes a Quasi-omni TX field. If the beamforming training with the STA 100 is not completed, the STA 200 sets the value of the Quasi-omni TX field to 1 and transmits a Probe response frame 2053. On the other hand, unlike FIG. 25, when the beamforming training with the STA 100 is completed, the STA 200 sets the value of the Quasi-omni TX field to 0 and transmits a Probe response frame 2053.
- FIG. 26 is a diagram showing an example of the frame format 2053a of the Probe response frame 2053 according to Modification 2-5.
- Each field of the frame format 2053a shown in FIG. 26 refers to FIG. 17 except that the content of Frame Body is changed from a Probe request frame to a Probe response frame in the frame format described above with reference to FIG. This is the same as each field of the frame format described above.
- FIG. 27 is a diagram showing an example of another frame format 2053b of the probe response frame 2053 according to the modification 2-5.
- Each field of the frame format 2053b shown in FIG. 27 refers to FIG. 18 except that the content of Frame Body is changed from the Probe request frame to the Probe response frame in the frame format described above with reference to FIG. This is the same as each field of the frame format described above.
- FIG. 28 is a diagram showing an example of another frame format 2053c of the Probe response frame 2053 according to the modification 2-5.
- Each field of the frame format 2053c shown in FIG. 28 refers to FIG. 19 except that the content of Frame Body is changed from the Probe request frame to the Probe response frame in the frame format described above with reference to FIG. This is the same as each field of the frame format described above.
- step S207 the STA 100 receives the Probe response frame 2053.
- the STA 100 completes discovery of the STA 200 according to a procedure similar to the procedure shown in steps S208 to S209 shown in FIG. Note that the value of the Quasi-omni TX field does not affect the procedure shown in steps S206 to S209 in FIG. 16, and therefore does not affect the procedure shown in steps S206 to S209 in FIG.
- the STA 200 transmits the Probe response frame 2053 using the pseudo omnidirectional antenna in Step S205e
- the other STAs (STA 300) existing at a distance close to the STA 200 also transmit the Probe response frame 2053 in Step S207e.
- the Probe response frame 2053 includes a Quasi-omni TX field.
- step S210e the STA 300 checks the value of the Quasi-omni TX field of the received Probe response frame 2053.
- the STA 300 determines that communication is possible without performing the beamforming training because the STA 200 exists at a close distance.
- the STA 300 may transmit an association request frame 1005 to the STA 200, for example, using the pseudo omnidirectional antenna pattern, and perform initial connection.
- the STA 200 receives the association request frame 1005. Note that, before transmitting the association request frame 1005, the STA 300 performs carrier sense and random backoff to acquire a transmission opportunity (Transmission Opportunity: TXOP, right to transmit).
- TXOP Transmission Opportunity
- the MAC frame generation circuit 112 combines the data of the Probe response frame F2 and the value F3 of the Quasi-omni TX field to generate a Probe response frame 2053 including the Quasi-omni TX field.
- the sequencer circuit 106 has the function described with reference to FIG. 7, and further controls the selection circuit 108 so that the Quasi-omniomTX field is included in the MAC frame when the Probe response frame 2053 is transmitted.
- the STA 200 transmits a Probe response frame 2053 including a Quasi-omni indicator. Therefore, whether STAs other than the STA 100 that receives the Probe response frame 2053 (for example, the STA 300) can also communicate using the pseudo omnidirectional antenna pattern (whether the STA 200 and the STA 300 exist at close distances). Whether or not) can be determined. In addition, other STAs (for example, the STA 300) existing at a close distance that have received the Probe response frame 2053 omit the beam forming in the BTI and the A-BFT, and complete the active scan before completing the beam forming. can do.
- the STA 300 can determine that the STA 200 exists at a close distance, so that it can be estimated that the subsequent frame transmission using the pseudo omnidirectional antenna pattern is successful. . Therefore, the STA 300 can start the initial connection and data communication with the STA 200 using the pseudo omnidirectional antenna pattern, and can shorten the time required for the initial connection.
- the STA 200 may transmit the probe response frame 2053 by including the TX EIRP field and the Quasi-omni RXantenna gain field shown in FIG. 21 instead of the Quasi-omni TX field. Similar to the modified example 2-4 described above with reference to FIG. 21, the TX EIRP field and the Quasi-omni RXantenna gain field can be used to determine whether or not they are close instead of the Quasi-omni TX field. Accuracy can be increased.
- FIG. 29 is a diagram illustrating an example of an overall configuration according to scenario 2 of the second embodiment.
- the STA 100 is an active scan STA.
- the STAs 200 and 300 are connection destination STAs.
- the STAs 200 and 300 are, for example, PCP / AP STAs, but may be non-PCP / AP STAs, non-PCP STAs, or non-APs.
- the STA 100 is a wireless terminal device, for example.
- the STAs 200 and 300 are, for example, radio base station apparatuses.
- FIG. 30 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of other STAs 200 and 300.
- STA 100 receives ACK frame 1002 and Probe response frame 1003 in steps S203 and S206 shown in FIG.
- the STA 100 may determine that there is no connection-destination STA in a nearby position in the currently used radio channel, and may perform beamforming training in BTI and A-BFT.
- step S200c the STA 100 performs beamforming training in BTI and A-BFT. For example, when receiving the SSW-FB frame 5003 from the STA 300, the STA 100 completes the beamforming training with the STA 300.
- step S201c the STA 100 that has completed the beamforming training with the STA 300 sets the RA field to the unicast address indicating the STA 300, sets the value of the Quasi-omni TX field to 0, and uses the beamforming directional antenna pattern.
- a Probe request frame 2041 is transmitted.
- step S202c when the STA 300 receives the probe request frame 2041, the STA 300 sets the transmission antenna array 116 as the best sector based on the information on the best sector of the transmission antenna array 116 included in the SSW-FB frame 5003 received in the A-BFT. Set.
- step S203c the STA 300 transmits an ACK frame 1002.
- step S205c the STA 300 transmits a Probe response frame 1003 to the STA 100.
- step S206c the STA 100 determines whether or not the ACK frame 1002 is received from the STA 300.
- step S207c the STA 100 determines whether a Probe response frame 1003 including discovery information has been received from the STA 300.
- the STA 100 determines that the ACK frame 1002 has been received in step S206c and determines that the Probe response frame 1003 has been received in step S207c, the STA 100 of the transmission antenna array 116 included in the SSW-FB frame 5003 received in the A-BFT Based on the best sector information, the transmitting antenna array 116 is set as the best sector.
- the STA 100 transmits an ACK frame 1004.
- the STA 300 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 300.
- the STA for example, the STA 200
- the STA 200 that does not complete the beamforming in BTI and A-BFT receives the Probe request frame 1041 in step S202d
- the RA field address is different from the STA 200 unicast address.
- the probe response frame 1003 is not transmitted.
- the STA 200 when executing an application using proximity communication, does not transmit the Probe response frame 1003 even if it receives the Probe request frame 2041 in which the value of the Quasi-omni TX field is set to 0.
- FIG. 31 is a diagram illustrating an example of an overall configuration according to scenario 3 of the second embodiment.
- the STA 100 is an active scan STA.
- the STAs 200, 300, and 400 are connection destination STAs.
- the STAs 200, 300, and 400 are, for example, PCP / AP STAs, but may be non-PCP / AP STAs, non-PCP STAs, or non-APs.
- the STA 100 is a wireless terminal device, for example.
- the STAs 200, 300, and 400 are wireless base station devices, for example.
- the STA 400 may be able to receive the Probe request frame 2041 transmitted using the best sector in the transmission to the STA 300.
- the STA 100 may set the destination of the Probe request frame 2041 as a broadcast address.
- FIG. 32 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of other STAs 200, 300, and 400.
- step S200f the STA 100 performs beam forming training in BTI and A-BFT. For example, when the STA 300 receives the SSW-FB frame 5003a from the STA 100, the STA 100 completes beamforming training with the STA 300. For example, when the STA 400 receives the SSW-FB frame 5003b from the STA 100, the STA 100 completes beamforming training with the STA 400.
- the STA 100 that has completed the beamforming training with the STA 300 and the STA 400 completes discovery of the STA 300 in steps S201c to S209c in the same manner as described above with reference to FIG.
- step S202f the Probe request frame 2041 in which the value of the Quasi-omni0TX field is set to 0 can be received.
- the STA 100 completes the discovery of the STA 400 by performing the steps S202f to S209f in the same manner as the steps S202c to S209c.
- the RA field address is different from the unicast address of STA200.
- the probe response frame 1003 is not transmitted.
- the STA 100 transmits a Probe request frame 2041 in which a broadcast address is set. Accordingly, probe responses can be received from a plurality of connection destination STAs without using individual channels and device resources for a plurality of connection destination STAs (for example, STA 300 and STA 400), which is required for discovery. Time can be shortened. Furthermore, when executing an application using near field communication, the STA 200 does not transmit the probe response frame 1003 even if it receives the probe request frame 2041 in which the value of the Quasi-omni TX field is set to 0. Signal generation can be reduced.
- FIG. 33 is a diagram illustrating an example of the overall configuration according to the third embodiment.
- the STA 100 is an active scan STA.
- the STA 200 is a connection destination STA.
- the STA 200 is, for example, a PCP / AP STA, but may be a non-PCP / AP STA, a non-PCP STA, or a non-AP.
- the STA 100 is a wireless terminal device, for example.
- the STA 200 is, for example, a radio base station device.
- the STA 100 is a STA that performs discovery.
- the STA 100 is an STA that performs initial connection.
- the STA 200 is a connection destination STA.
- the STA 200 is, for example, a PCP / AP STA, but may be a non-PCP / AP STA, a non-PCP STA, or a non-AP.
- FIG. 34 is a diagram illustrating an example of a procedure in which the STA 100 performs initial connection with another STA 200 according to the third embodiment.
- the STA 100 is, for example, a wireless terminal device.
- the STA 200 is, for example, a radio base station device.
- Steps S301 to S304 shown in FIG. 34 are the same as steps S201 to S204 shown in FIG. 16 except that the association request frame 3001 is used instead of the Probe request frame 2001 shown in FIG. Omitted.
- step S305 if the beamforming training with the STA 100 is not completed, the STA 200 transmits an association response frame 3002 using a pseudo omni-directional antenna pattern in order to transmit the examination result of the association request.
- step S306 the STA 100 determines whether or not the ACK frame 1002 has been received from the STA 200.
- step S307 the STA 100 determines whether or not the association response frame 3002 has been received from the STA 200.
- step S306 If it is determined in step S306 that the ACK frame 1002 has been received and it is determined in step S307 that the association response frame 3002 has been received, the STA 100 transmits an ACK frame 1004 using the pseudo omnidirectional antenna pattern in step S308. To respond. Next, in step S309, the STA 200 receives the ACK frame 1004. Thereby, the STA 100 and the STA 200 complete the association.
- FIG. 35 is a diagram showing an example of the format of an association request frame 3001 including a QO TX field indicating a pseudo omnidirectional transmission pattern according to the third embodiment.
- FIG. 36 is a diagram illustrating an example of a format of an association request frame 3001 including a QO indicator field indicating a pseudo omnidirectional transmission pattern according to the third embodiment.
- the fields of the format shown in FIG. 36 are the same as the fields of the format of the Probe request frame 2001 shown in FIG. 36.
- FIG. 37 is a diagram showing an example of a format of an association request frame 3001 indicating a pseudo omnidirectional transmission pattern according to the third embodiment.
- Each field of the format shown in FIG. 37 is the same as each field of the format of the Probe request frame 2001 shown in FIG. 37
- FIG. 38 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to the third embodiment.
- the transmission frame generation circuit 104c generates a value F3 of the Quasi-omni TX field in addition to the association request frame F5 and the association response frame F6 shown in FIG.
- the MAC frame generation circuit 112 combines the data of the association request frame F5 and the value F3 of the Quasi-omni TX field, and generates MAC frame data including the association request frame F5.
- the sequencer circuit 106 determines whether or not to transmit the association request frame 2001 using the pseudo omnidirectional antenna pattern. When transmission is performed using the pseudo omnidirectional antenna pattern, the sequencer circuit 106 is set so that the schedule circuit 126 determines the transmission timing, and the selection circuit 108 is set so as to select the data of the association request frame 2001.
- the sequencer circuit 106 sets the MAC frame generation circuit 112 to generate the MAC frame of the association request frame, and the transmission and modulation circuit 114 sets the association request frame 2001 in accordance with the transmission timing determined by the schedule circuit 126.
- a parameter for example, MCS
- the sequencer circuit 106 sets the transmission antenna array 116 to a pseudo omnidirectional antenna pattern.
- sequencer circuit 106 performs processing of the received association request frame 2001 and association response frame 3002. For example, the sequencer circuit 106 of the STA 100 determines whether or not the RA field of the received frame is the unicast address of the STA 100, and determines whether or not to transmit an ACK.
- the STA 100 that has not completed the association can quickly connect to the adjacent STA 200 without the overhead of BTI and A-BFT.
- An association may be identified as a candidate link for a near field communication application, such as a kiosk download, for example.
- the STA 200 can estimate whether or not the STA 100 reaches the STA 100 when the association response frame 3002 is transmitted using the pseudo omnidirectional antenna pattern.
- the Quasi-omni indicator can also indicate whether a quick link setup for near field communication is required.
- the modified example 3-1 can be considered in the same manner as the modified example 2-1 for the second embodiment.
- the STA 200 may measure the reception quality (for example, RSSI, SINR) of the association request frame 3001.
- reception quality for example, RSSI, SINR
- step S304 in addition to checking the value of the Quasi-omni
- step S305 the STA 200 uses the pseudo omnidirectional antenna pattern to perform an association response. A frame 3002 is transmitted.
- the STA 200 causes the STA 100 to communicate with the pseudo omnidirectional antenna pattern. It may be determined that it is not suitable for (proximity communication), and transmission of the association response frame 3002 may be stopped.
- the association response frame 3002 may be transmitted by setting the transmit antenna array 116 as the best sector in the transmission to the STA (for example, the STA 100) indicated by the transmission source address of the association request frame 3001.
- the modified example 3-1-1 can be considered in the same manner as the modified example 2-1-1 for the second embodiment.
- the STA 200 may transmit the header of the PHY packet including the ACK frame 1002 including a value indicating the reception quality (RSSI or SINR). Further, the STA 200 may determine whether or not to send an association response frame 3002 in step S305 based on a value indicating the reception quality.
- RSSI reception quality
- SINR reception quality
- the modified example 3-2 can be considered in the same manner as the modified example 2-2 for the second embodiment.
- the STA 100 may transmit the association request frame 3001 to which the TRN-R field is added using a pseudo omnidirectional antenna pattern in step S301.
- the STA 200 receives the association request frame 3001 to which the TRN-R field is added. Similar to the modified example 2-2, the STA 200 performs the beamforming training by measuring the reception quality for each reception antenna sector, and determines the best sector of the reception antenna array 118 of the STA 200 for communicating with the STA 100. Also good. When the STA 200 has antenna pattern reciprocity, the STA 200 may determine the best sector of the transmit antenna array 116 based on the determined best sector of the receive antenna array 118.
- the STA 200 may transmit the ACK frame 1002 using the best sector of the transmission antenna array 116 determined in the reception of the association request frame 3001 to which the TRN-R field is added.
- the STA 200 may transmit the association response frame 3002 using the best sector of the transmission antenna array 116 determined in the reception of the association request frame 3001 to which the TRN-R field is added. .
- the effects of the third embodiment and the modified example 2-2 can be obtained simultaneously.
- the modified example 3-3 can be considered in the same manner as the modified example 2-3 for the second embodiment.
- step S302 when the STA 200 receives an association request frame 3001 from an STA that has not completed beamforming training (for example, the STA 100), the association response frame 3002 with the TRN-R field added in step S305. May be sent.
- the STA 100 when the STA 100 receives the association response frame 3002 to which the TRN-R field is added in step S307, the STA 100 measures the reception quality while switching the reception antenna sector for each TRN-R subfield, and receives beamforming Training may be performed to determine the best sector of the receive antenna array 118.
- the STA 100 may determine the best sector of the transmission antenna array 116 used for subsequent transmission based on the reception quality for each TRN-R subfield.
- step S308 the STA 100 may transmit the ACK frame 1004 using the determined best sector of the transmission antenna array 116.
- the STA 200 receives the ACK frame 1004.
- the STA 200 does not add the TRN-R field to the association response frame 3002 in step S305. May be sent to.
- the modified example 3-4 can be considered as in the modified example 2-4 with respect to the second embodiment.
- step S301 the STA 100 adds transmission power (EIRP: equivalent isotropically radiated power) and information on the reception antenna gain of the pseudo omnidirectional antenna to the association request frame 3001 and transmits it. May be.
- EIRP equivalent isotropically radiated power
- FIG. 39 shows an example of the format of an association request frame 3001 according to Modification 3-4.
- FIG. 39 is the same as FIG. 21 except that the format shown in FIG. 21 is the format of the Probe request frame 2041, whereas the format shown in FIG. 39 is the format of the association request frame 3001. Description is omitted.
- FIG. 40 is a diagram showing an example of an association request frame including a Quasi-omni Control element according to Modification 3-4.
- step S302 shown in FIG. 34 when the STA 200 receives the association request frame 3001 shown in FIG. 39, for example, in the same manner as in the modified example 2-4, the STA 200 is connected between the STA 100 and the STA 200 by the above equation (1). Propagation loss may be calculated.
- the STA 200 may use the calculated propagation loss value to determine that the frame reaches the STA 100 when Expression (2) is satisfied in the same manner as in Modification 2-4.
- the STA 200 determines that the association response frame 3002 reaches the STA 100, and transmits the association response frame 3002 using the pseudo omnidirectional antenna pattern in step S305.
- the Quasi-omni TX field of the association request frame 3001 is Can be omitted.
- Modification 3-5 can be considered in the same manner as the modification 2-5 with respect to the second embodiment.
- FIG. 41 is a diagram illustrating an example of an overall configuration according to Modification 3-5.
- the STA 100 and the STA 200 exist at a close distance, and another STA (STA 300) exists at a close distance from the STA 200.
- FIG. 42 is a diagram illustrating an example of a procedure in which the STA 100 performs initial connection with another STA 200 according to Modification 3-5.
- steps S301 to S303 shown in FIG. 34 are the same as steps S301 to S303 shown in FIG. 34, and a description thereof will be omitted.
- step S304f shown in FIG. 42 the STA 200 determines whether or not to transmit the association response frame 3002 using the pseudo omnidirectional antenna.
- the STA 200 transmits an association response frame 3002 using a pseudo omni-directional antenna based on whether the association request frame 3001 received in step S302 includes a unicast address addressed to another STA. To decide.
- step S302 based on the value of the QO TX field of the association request frame 3001 received in step S302, it is determined whether or not to transmit the association response frame 3002 using a pseudo omnidirectional antenna. In another example, based on the Quasi-omni-indicator of the association request frame 3001 received in step S302, it is determined whether or not to transmit the association response frame 3002 using a pseudo omnidirectional antenna.
- step S305f the association response is transmitted using the pseudo omnidirectional antenna pattern in order to transmit the examination result of the association request.
- a frame 3002 is transmitted.
- the association response frame 3002 includes a Quasi-omni TX field. If the beamforming training with the STA 100 is not completed, the STA 200 sets the value of the Quasi-omni / TX field to 1 and transmits an association response frame 3002. On the other hand, when beamforming training with STA 100 is completed, STA 200 transmits an association response frame 3002 with the value of the Quasi-omni0TX field set to 0, unlike FIG.
- the STA 100 and the STA 100 and the STA 200 complete the association according to the same procedure as the procedure shown in steps S306 to S309 shown in FIG.
- the association response frame 3002 includes a Quasi-omni TX field.
- step S310g the STA 300 checks the value of the Quasi-omni TX field of the received Probe response frame 2053.
- the STA 300 determines that communication is possible without performing beamforming training because the STA 200 is in a close position.
- the STA 300 may transmit, for example, a Probe request frame 3003 to the STA 200 using the pseudo omnidirectional antenna pattern in Step S311g.
- the STA 200 existing at a distance close to the STA 300 receives the Probe request frame 3003.
- FIG. 43 is a diagram showing an example of the format of an association response frame 3002 including a QO TX field indicating a pseudo omnidirectional transmission pattern according to Modification 3-5.
- FIG. 44 is a diagram showing another example of the format of the association response frame 3002 including the QO TX field indicating the pseudo omnidirectional transmission pattern according to the modified example 3-5.
- the fields of the format shown in FIG. 44 are the same as the fields of the format of the Probe response frame 2053b shown in FIG.
- FIG. 45 is a diagram showing an example of the format of an association response frame 3002 indicating a pseudo omnidirectional transmission pattern according to Modification 3-5.
- FIG. 46 is a diagram illustrating an example of the overall configuration according to the fourth embodiment.
- the STA 100 is, for example, a proximity communication device (for example, a data kiosk).
- the STA 200 is a terminal connected to the STA 100, for example.
- FIG. 47 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to the fourth embodiment.
- the STA 100 may, for example, periodically or in response to a user trigger action, from an active application attempting to set up a short-range or high-speed initial connection for discovery using a pseudo omni-directional antenna pattern. Receive an application request.
- the application CPU of the STA 100 issues an application request to the sequencer circuit 106 so as to perform a short-distance and high-speed initial connection.
- an application request is periodically issued to the sequencer circuit 106 to perform short-distance and high-speed initial connection. To do.
- step S401 the STA 100 transmits a Probe request frame 1001 or an association request frame (not shown).
- step S402 the STA 200 receives a probe request frame 1001 or an association request frame (not shown).
- step S403 the STA 200 transmits an ACK frame 1002.
- step S404 the STA 200 transmits a probe response frame 1003 or an association response frame (not shown) based on the frame received in step S402, and then uses a transmission method: (1) a pseudo omnidirectional antenna pattern. 2) Select transmission from the best sector or (3) Do not transmit. If no transmission method is selected, step S404 may be omitted.
- step S405 the probe response frame 1003 or an association response frame (not shown) is transmitted by the transmission method selected in step S404.
- step S406 the STA 100 determines whether or not the ACK frame 1002 has been received from the STA 200.
- step S407 the STA 100 determines whether a Probe response frame 1003 or an association response frame (not shown) has been received from the STA 200.
- step S406 If it is determined in step S406 that an ACK frame 1002 has been received and it is determined in step S407 that a Probe response frame 1003 or an association response frame (not shown) has been received, the STA 100 can communicate using a pseudo omnidirectional antenna pattern. It is determined that the STA 200 exists at (close distance), and in step S408, the ACK frame 1004 is transmitted to the STA 200. Next, in step S409, the STA 200 receives the ACK frame 1004. Thereby, the STA 100 completes the discovery of the STA 200 or completes the association with the STA 200.
- step S406 if it is determined in step S406 that the STA 100 has not received the Probe response frame 1003 or the association response frame from the STA 200, there is no connection destination STA (STA 200 and other STAs not shown) at a close distance. to decide.
- the procedure from step S401 to S409 is, for example, the discovery procedure of the STA 200 according to the procedure shown in FIG. 5, FIG. 9A, FIG. 11, FIG.
- the procedure from step S401 to S409 is, for example, an association procedure with the STA 200 according to the procedure shown in FIG. 34 or FIG.
- FIG. 48 is a diagram illustrating an example of the configuration of the STAs 100 and 200 according to the fourth embodiment.
- the application CPU 102a executes application software such as data transfer software, Web browser, payment software, and ticket gate.
- the application CPU 102a may execute application software that uses tap and go.
- tap and go means that a device (for example, the STA 200) and a terminal (for example, the STA 100) are brought into contact with each other and / or in close proximity to each other (for example, less than one second to several seconds).
- Application software that uses Tap and Go includes, for example, automatic railway ticket gates and upload / download kiosk terminals.
- Application CPU 102a makes a request for proximity communication and high-speed initial connection to the sequencer circuit 106.
- the sequencer circuit 106 determines whether or not to transmit a Probe request frame using a pseudo omnidirectional antenna pattern in response to a request from the application CPU 102a.
- the application CPU 102a when executing an application using tap and go, the application CPU 102a performs active scanning for proximity communication and high-speed initial connection as shown in FIG. Also good. Further, for example, when executing the Web browser, the application CPU 102a may request an active scan for communication for performing beamforming as illustrated in FIG.
- FIG. 48 The other components shown in FIG. 48 are the same as those described above with reference to FIG. 48.
- the STA 100 determines whether or not to transmit the probe request frame 1001 using a pseudo omnidirectional antenna pattern according to the requirements of a specific application such as short-range communication or high-speed communication. . Therefore, it is possible to connect to an appropriate access point according to the application, and it is possible to execute high-speed active scan and initial connection.
- FIG. 49 is a diagram showing an example of the overall configuration according to the fifth embodiment.
- the STA 100 is, for example, a proximity communication device (such as a kiosk).
- the STA 200 is a terminal connected to the STA 100, for example.
- FIG. 50 is a diagram illustrating an example of a procedure in which the STA 100 performs discovery of another STA 200 according to the fifth embodiment.
- step S500 the STA 100 detects a close object.
- step S500 STA 100 and STA 200 perform steps S502 to S509 in response to the detection of an adjacent object. Steps S502 to S509 are the same as steps S402 to S409 described above with reference to FIG. 47, and description thereof will be omitted.
- FIG. 51 is a diagram illustrating an example of the configuration of the STA 100 according to the fifth embodiment.
- the proximity detection circuit 128 detects an object close to the STA 100 in order to detect a situation in which pseudo omnidirectional communication with the connection destination STA is possible.
- the proximity detection circuit 128 is, for example, a proximity sensor such as a capacitive proximity sensor or a magnetic proximity sensor, a sensor that detects reflection of a transmission signal such as an infrared sensor or an ultrasonic sensor, or wireless using a wireless technology different from the 11ad standard. It is a sensor or a contact sensor.
- the wireless technology different from the 11ad standard is, for example, NFC, RFID, Bluetooth (registered trademark), or Wi-Fi.
- the sequencer circuit 106 starts steps S501 to S509 in FIG. 50 when the proximity detection circuit 128 detects an object close to the STA 100.
- FIG. 51 The other components shown in FIG. 51 are the same as those described above with reference to FIG. 51.
- the STA 100 can start the active scan and the initial connection in accordance with the approach of the connection destination STA that is the near field communication device or the terminal, so that the time required for the active scan and the initial connection can be shortened. Further, even when the human body approaches, for example, the probe request frame 1001 is transmitted using the pseudo omnidirectional antenna pattern, so that the EIRP is lowered, so that the electric field intensity radiated to the human body is lowered. And the influence of radiation on the human body can be reduced.
- the proximity detection circuit 128 may determine whether or not the connection destination STA is in proximity based on a position detection technique such as GPS or timing measurement.
- the proximity detection circuit 128 is a circuit that detects the proximity of a proximity communication device or a terminal based on reception of a data frame including a Quasi-omnidicindicator frame of a DMG Beacon frame 5001, for example. Also good. For example, the proximity detection circuit 128 may determine that the connection destination STA is in proximity when the data frame is received.
- the STA 100 may determine whether or not the connection destination STA is in proximity based on a measured value of the received signal strength (for example, in the DMG Beacon frame 5001).
- Each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- a Probe request frame is transmitted using a pseudo omnidirectional antenna pattern, and a Probe response to the Probe request frame is transmitted.
- the radio base station apparatus is selected as a connection destination, and when the Probe response frame is not received from the radio base station apparatus, the beamforming training with the radio base station apparatus is performed. carry out.
- the Probe request frame when the Probe request frame is transmitted using the pseudo omnidirectional antenna pattern, the Probe request frame is transmitted using the pseudo omnidirectional antenna pattern.
- the Probe request frame uses the best sector of the transmit antenna array determined by the beamforming training, and the Probe request frame includes the pseudo omnidirectional antenna pattern.
- the Probe request frame including a value indicating that it has not been transmitted is transmitted using.
- the communication method of the radio base station apparatus of the present disclosure receives a Probe request frame transmitted using a pseudo omnidirectional antenna pattern from a radio terminal apparatus when beamforming training with the radio terminal apparatus is incomplete. Based on the Probe request frame, it is determined whether or not to transmit a Probe response frame to the Probe request frame using a pseudo omnidirectional antenna pattern, and determined to transmit using the pseudo omnidirectional antenna pattern. The Probe response frame is transmitted to the wireless terminal device using the pseudo omnidirectional antenna pattern, and when it is determined not to transmit using the pseudo omnidirectional antenna pattern, the Probe response frame is transmitted. The beamforming train with the wireless terminal device To implement the training.
- a Probe response frame for the Probe request frame is simulated. It decides to transmit using an omnidirectional antenna pattern.
- the Probe request frame when the Probe request frame includes a value indicating that the Probe request frame is transmitted using the pseudo omnidirectional antenna pattern, a Probe response to the Probe request frame The frame is determined to be transmitted using the pseudo omnidirectional antenna pattern.
- the wireless terminal device of the present disclosure includes a reception antenna array, a sequencer circuit, and a transmission antenna array.
- the sequencer circuit When beamforming training with a wireless base station device is incomplete, the sequencer circuit includes the transmission antenna array. Is set to a pseudo omnidirectional antenna pattern, the transmitting antenna array transmits a Probe request frame to the wireless base station device, and the receiving antenna array transmits a Probe response frame for the Probe request frame from the wireless base station device.
- the sequencer circuit selects the radio base station apparatus as a connection destination, and when the reception antenna array does not receive the Probe response frame from the radio base station apparatus, the sequencer circuit The beam forming train with the station apparatus To implement the training.
- the radio base station apparatus of the present disclosure includes a reception antenna array, a sequencer circuit, and a transmission antenna array.
- the reception antenna array is pseudo omnidirectional.
- the probe request frame transmitted using the directional antenna pattern is received from the wireless terminal device, and the sequencer circuit converts the Probe response frame to the Probe request frame based on the Probe request frame into a pseudo omnidirectional antenna pattern. If the sequencer circuit determines to transmit using the pseudo omnidirectional antenna pattern, the sequencer circuit sets the transmit antenna array to a pseudo omnidirectional antenna pattern, and the transmission The antenna array has a probe response frame. And the transmit antenna array does not transmit the Probe response frame, and the sequencer circuit performs the beamforming with the wireless terminal device. Conduct training.
- One aspect of the present disclosure is suitable for a communication system that conforms to a Wi-Fi standard, for example, the IEEE 802.11ad or the IEEE 802.11ay standard.
- STA 102 host 104 transmission frame generation circuit 106 sequencer circuit 108 selection circuit 112 MAC frame generation circuit 114 transmission and modulation circuit 116 transmission antenna array 118 reception antenna array 122 reception and demodulation circuit 124 MAC frame reception circuit 126 schedule circuit 128 proximity detection circuit 200
- STA 300 STA 400 STA 1001 Probe request frame 1002 ACK frame 1003 Probe response frame 1004 ACK frame 1005 Association request frame 1021 Probe request frame 1033 Probe response frame 1041 Probe request frame 2001 Probe request frame 2041 Probe request frame 2053 Probe response frame 3001 Association request frame 3002 3003 Probe request frame 5001 DBcn frame 5002 SSW frame 5003, 5003a, 5003b SSW-FB frame
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Abstract
Description
図1は、アクティブスキャンに係る全体構成の一例を示す図である。
図4は、実施の形態1のシナリオ1に係る全体構成の一例を示す図である。
一例において、図5に示されるステップS102において、接続先のSTA200は、Probe要求フレーム1001を受信した場合、その受信品質、例えばRSSI(Recieved Signal Strength Indicator、受信信号強度)およびSINR(Signal to Interference and Noise Ratio、信号対干渉および雑音電力比)を測定してもよい。
一例において、図5に示されるステップS103において、STA200は、ACKフレーム1002を含むPHYパケットのヘッダに、受信品質(RSSIまたはSINR)を示す値を含めて送信してもよい。さらに、STA200は、受信品質を示す値に基づいて、ステップS105においてProbe応答フレーム1003を送るか否かを判断してもよい。
図9Aは、変形例1-2に係る、STA100が他のSTA200のディスカバリを行う手順の一例を示す図である。
図11は、変形例1-3に係る、STA100が他のSTA200のディスカバリを行う手順の一例を示す図である。
図13は、実施の形態1のシナリオ2に係る全体構成の一例を示す図である。
図15は、実施の形態2のシナリオ1に係る全体構成の一例を示す図である。
実施の形態2についても、実施の形態1に対する変形例1-1と同様に、変形例2-1を考えることができる。
実施の形態2についても、実施の形態1に対する変形例1-1-1と同様に、変形例2-1-1を考えることができる。
実施の形態2についても、実施の形態1に対する変形例1-2と同様に、変形例2-2を考えることができる。図16を参照して説明する。
実施の形態2についても、実施の形態1に対する変形例1-3と同様に、変形例2-3を考えることができる。図16を参照して説明する。
図16と異なり、ステップS201において、STA100は、Probe要求フレーム2001に送信電力(EIRP:equivalent isotropically radiated power、等価等方放射電力)および擬似無指向性アンテナの受信アンテナゲインの情報を追加したProbe要求フレーム2001を送信してもよい。
図24は、変形例2-5に係る全体構成の一例を示す図である。
図29は、実施の形態2のシナリオ2に係る全体構成の一例を示す図である。
図31は、実施の形態2のシナリオ3に係る全体構成の一例を示す図である。
図33は、実施の形態3に係る全体構成の一例を示す図である。
実施の形態3についても、実施の形態2に対する変形例2-1と同様に、変形例3-1を考えることができる。
実施の形態3についても、実施の形態2に対する変形例2-1-1と同様に、変形例3-1-1を考えることができる。
実施の形態3についても、実施の形態2に対する変形例2-2と同様に、変形例3-2を考えることができる。
実施の形態3についても、実施の形態2に対する変形例2-3と同様に、変形例3-3を考えることができる。
実施の形態3についても、実施の形態2に対する変形例2-4と同様に、変形例3-4を考えることができる。
実施の形態3についても、実施の形態2に対する変形例2-5と同様に、変形例3-5を考えることができる。
図46は、実施の形態4に係る全体構成の一例を示す図である。
図49は、実施の形態5に係る全体構成の一例を示す図である。
102 ホスト
104 送信フレーム生成回路
106 シーケンサ回路
108 選択回路
112 MACフレーム生成回路
114 送信および変調回路
116 送信アンテナアレイ
118 受信アンテナアレイ
122 受信および復調回路
124 MACフレーム受信回路
126 スケジュール回路
128 近接検出回路
200 STA
300 STA
400 STA
1001 Probe要求フレーム
1002 ACKフレーム
1003 Probe応答フレーム
1004 ACKフレーム
1005 アソシエーション要求フレーム
1021 Probe要求フレーム
1033 Probe応答フレーム
1041 Probe要求フレーム
2001 Probe要求フレーム
2041 Probe要求フレーム
2053 Probe応答フレーム
3001 アソシエーション要求フレーム
3002 アソシエーション応答フレーム
3003 Probe要求フレーム
5001 DBcnフレーム
5002 SSWフレーム
5003,5003a,5003b SSW-FBフレーム
Claims (7)
- 無線端末装置の通信方法であって、
無線基地局装置とのビームフォーミングトレーニングが未完了である場合、疑似無指向性アンテナパターンを用いてProbe要求フレームを送信し、
前記Probe要求フレームに対するProbe応答フレームを無線基地局装置から受信した場合、前記無線基地局装置を接続先として選択し、
前記Probe応答フレームを前記無線基地局装置から受信しない場合、前記無線基地局装置との前記ビームフォーミングトレーニングを実施する、
無線端末装置の通信方法。 - 前記疑似無指向性アンテナパターンを用いて前記Probe要求フレームを送信する場合、前記Probe要求フレームが前記疑似無指向性アンテナパターンを用いて送信されたことを示す値を前記Probe要求フレームに含め、
前記ビームフォーミングトレーニングが完了済の場合、前記ビームフォーミングトレーニングによって決定された送信アンテナアレイのベストセクタを用いて、前記Probe要求フレームが前記疑似無指向性アンテナパターンを用いて送信されていないことを示す値を含めた前記Probe要求フレームを送信する、
請求項1に記載の無線端末装置の通信方法。 - 無線基地局装置の通信方法であって、
無線端末装置とのビームフォーミングトレーニングが未完了である場合、疑似無指向性アンテナパターンを用いて送信されたProbe要求フレームを無線端末装置から受信し、
前記Probe要求フレームに基づいて、前記Probe要求フレームに対するProbe応答フレームを、擬似無指向性アンテナパターンを用いて送信するか否かを決定し、
前記擬似無指向性アンテナパターンを用いて送信すると決定した場合、前記Probe応答フレームを、前記擬似無指向性アンテナパターンを用いて前記無線端末装置に送信し、
前記擬似無指向性アンテナパターンを用いて送信しないと決定した場合、前記Probe応答フレームを送信せず、前記無線端末装置との前記ビームフォーミングトレーニングを実施する、
無線基地局装置の通信方法。 - 前記Probe要求フレームの受信品質を測定し、前記受信品質を示す値が予め定められた閾値を超える場合、前記Probe要求フレームに対するProbe応答フレームを、擬似無指向性アンテナパターンを用いて送信すると決定する、請求項3に記載の無線基地局装置の通信方法。
- 前記Probe要求フレームが前記疑似無指向性アンテナパターンを用いて送信されたことを示す値を前記Probe要求フレームが含む場合、前記Probe要求フレームに対するProbe応答フレームを、前記擬似無指向性アンテナパターンを用いて送信すると決定する、請求項3に記載の無線基地局装置の通信方法。
- 受信アンテナアレイと、シーケンサ回路と、送信アンテナアレイと、
を備え、
無線基地局装置とのビームフォーミングトレーニングが未完了である場合、前記シーケンサ回路は、前記送信アンテナアレイを疑似無指向性アンテナパターンに設定し、前記送信アンテナアレイは、Probe要求フレームを前記無線基地局装置に送信し、
前記受信アンテナアレイが、前記Probe要求フレームに対するProbe応答フレームを前記無線基地局装置から受信した場合、前記シーケンサ回路は、前記無線基地局装置を接続先として選択し、
前記受信アンテナアレイが、前記Probe応答フレームを前記無線基地局装置から受信しない場合、前記シーケンサ回路は、前記無線基地局装置との前記ビームフォーミングトレーニングを実施する、
無線端末装置。 - 受信アンテナアレイと、シーケンサ回路と、送信アンテナアレイと、
を備え、
無線端末装置とのビームフォーミングトレーニングが未完了である場合、前記受信アンテナアレイは、疑似無指向性アンテナパターンを用いて送信されたProbe要求フレームを前記無線端末装置から受信し、
前記シーケンサ回路は、前記Probe要求フレームに基づいて、前記Probe要求フレームに対するProbe応答フレームを、擬似無指向性アンテナパターンを用いて送信するか否かを決定し、
前記擬似無指向性アンテナパターンを用いて送信すると決定した場合、前記シーケンサ回路は、前記送信アンテナアレイを疑似無指向性アンテナパターンに設定し、前記送信アンテナアレイは、前記Probe応答フレームを送信し、
前記擬似無指向性アンテナパターンを用いて送信しないと決定した場合、前記送信アンテナアレイは、前記Probe応答フレームを送信せず、前記シーケンサ回路は、前記無線端末装置との前記ビームフォーミングトレーニングを実施する、
無線基地局装置。
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
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CN201780074651.7A CN110036572B (zh) | 2016-12-28 | 2017-12-19 | 无线终端装置及其通信方法、无线基站装置及其通信方法 |
CA3046172A CA3046172A1 (en) | 2016-12-28 | 2017-12-19 | Communication method for use of wireless terminal device, communication method for use of wireless base station device, wireless terminal device, and wireless base station device |
KR1020197018268A KR102434560B1 (ko) | 2016-12-28 | 2017-12-19 | 무선 단말 장치를 사용한 통신 방법, 무선 기지국 장치를 사용한 통신 방법, 무선 단말 장치, 및 무선 기지국 장치 |
MX2019007415A MX2019007415A (es) | 2016-12-28 | 2017-12-19 | Metodo de comunicacion para usar un dispositivo de terminal inalambrico, metodo de comunicacion para usar un dispositivo de estacion base inalambrico, dispositivo de terminal inalambrico y dispositivo de estacion base inalambrico. |
RU2019119692A RU2717948C1 (ru) | 2016-12-28 | 2017-12-19 | Способ связи для использования беспроводного устройства терминала, способ связи для использования беспроводного устройства базовой станции, беспроводное устройство терминала и беспроводное устройство базовой станции |
BR112019012770A BR112019012770A2 (pt) | 2016-12-28 | 2017-12-19 | método de comunicação para o uso do dispositivo terminal sem fio, método de comunicação para o uso do dispositivo de estação base sem fio, do dispositivo terminal sem fio e do dispositivo de estação base sem fio |
KR1020227028295A KR102593703B1 (ko) | 2016-12-28 | 2017-12-19 | 통신 방법 및 무선 단말 장치 |
CN202210791050.0A CN115314091A (zh) | 2016-12-28 | 2017-12-19 | 无线终端装置及其通信方法、无线基站装置及其通信方法 |
MYPI2019003642A MY197386A (en) | 2016-12-28 | 2017-12-19 | Communication method for use of wireless terminal device, communication method for use of wireless base station device, wireless terminal device, and wireless base station device |
EP17888138.9A EP3565137A4 (en) | 2016-12-28 | 2017-12-19 | COMMUNICATION METHOD FOR WIRELESS DEVICE DEVICE, COMMUNICATION METHOD FOR WIRELESS BASESTATION DEVICE, WIRELESS END DEVICE AND WIRELESS BASESTATION DEVICE |
EP24174543.9A EP4391697A2 (en) | 2016-12-28 | 2017-12-19 | Communication method for wireless terminal device and wireless terminal device |
US16/436,968 US11595287B2 (en) | 2016-12-28 | 2019-06-11 | Communication method for wireless terminal device, communication method for wireless base station device, wireless terminal device, and wireless base station device |
CONC2019/0006388A CO2019006388A2 (es) | 2016-12-28 | 2019-06-18 | Método de comunicación para uso de dispositivo terminal inalámbrico, método de comunicación para uso de dispositivo de estación base inalámbrico, dispositivo terminal inalámbrico, y dispositivo de estación base inalámbrico |
US18/161,653 US20230179504A1 (en) | 2016-12-28 | 2023-01-30 | Communication method for wireless terminal device, communication method for wireless base station device, wireless terminal device, and wireless base station device |
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JP2017237894A JP7076202B2 (ja) | 2016-12-28 | 2017-12-12 | 通信方法、無線端末装置、および集積回路 |
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CN (1) | CN115314091A (ja) |
MX (1) | MX2022010500A (ja) |
MY (1) | MY197386A (ja) |
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WO2020048417A1 (zh) * | 2018-09-07 | 2020-03-12 | 华为技术有限公司 | 扇区扫描方法及相关装置 |
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WO2023008201A1 (ja) * | 2021-07-28 | 2023-02-02 | パナソニックIpマネジメント株式会社 | 通信装置及び通信方法 |
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- 2017-12-19 KR KR1020227028295A patent/KR102593703B1/ko active IP Right Grant
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- 2017-12-19 EP EP24174543.9A patent/EP4391697A2/en active Pending
- 2017-12-19 WO PCT/JP2017/045416 patent/WO2018123700A1/ja active Application Filing
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MY197386A (en) | 2023-06-15 |
KR102593703B1 (ko) | 2023-10-24 |
EP4391697A2 (en) | 2024-06-26 |
TWI820459B (zh) | 2023-11-01 |
CN115314091A (zh) | 2022-11-08 |
MX2022010500A (es) | 2022-09-21 |
JP2018110382A (ja) | 2018-07-12 |
JP7328399B2 (ja) | 2023-08-16 |
JP2022116076A (ja) | 2022-08-09 |
JP7076202B2 (ja) | 2022-05-27 |
US20230179504A1 (en) | 2023-06-08 |
TW202143670A (zh) | 2021-11-16 |
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