WO2014199610A1 - 無線通信装置 - Google Patents
無線通信装置 Download PDFInfo
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- WO2014199610A1 WO2014199610A1 PCT/JP2014/003032 JP2014003032W WO2014199610A1 WO 2014199610 A1 WO2014199610 A1 WO 2014199610A1 JP 2014003032 W JP2014003032 W JP 2014003032W WO 2014199610 A1 WO2014199610 A1 WO 2014199610A1
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- wireless communication
- communication device
- frame
- transmission
- data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1614—Details of the supervisory signal using bitmaps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/34—Flow control; Congestion control ensuring sequence integrity, e.g. using sequence numbers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
Definitions
- the present disclosure relates to a wireless communication device that switches a beam pattern of an antenna in wireless communication.
- wireless communication that realizes high-speed data transmission
- a wireless LAN Local Area
- IEEE The Institute of Electrical and Electronics Engineers, Inc.
- 802.11 for example, IEEE802.11a or IEEE802.11b. Network
- Digital devices including wireless communication devices that can use a wireless LAN have become widespread as digital devices become more sophisticated.
- Digital devices can transmit large amounts of data (for example, HD (High Density) video data) to other digital devices by directly communicating with each other without using an access point, for example.
- HD High Density
- millimeter wave communication uses a wider band than wireless LAN communication, high-speed wireless communication of, for example, 1 [Gbps] or more is possible when the communication allowable range of millimeter wave communication is used effectively.
- the millimeter wave band of 60 [GHz] has a short wavelength and strong straightness, and thus is easily affected by changes in the propagation environment (communication environment) of the radio wave.
- a wireless communication device that transmits data is referred to as a data transmission wireless communication device
- a wireless communication device that receives data is referred to as a data reception wireless communication device
- the data transmission wireless communication device includes a wireless transmission unit and a wireless reception unit
- the data reception wireless communication device includes a wireless transmission unit and a wireless reception unit.
- beam forming is used to set, for example, a beam pattern along the directivity of either the transmission antenna or the reception antenna, or a beam pattern along the directivity of both the transmission antenna and the reception antenna.
- the beam pattern of the antenna is set for a single communication partner, or is set to be appropriate for a plurality of communication partners, although not optimal.
- the amount of signal attenuation is taken into account, and the transmission antenna and the reception antenna may be used separately, and different beam patterns are set for the transmission antenna and the reception antenna.
- the receiving antenna is set to be omnidirectional, and the transmitting antenna is set to a beam pattern in which a main beam is formed in a specific direction.
- Patent Document 1 is known as a prior art for determining an antenna beam pattern in millimeter wave communication.
- each time a data transmission wireless communication device transmits a transmission frame the data transmission wireless communication device starts a timer and counts the number of transmission frames (data frame).
- the transmission antenna receives the transmission antenna when the count value of the timer or the number of retransmissions of the transmission frame reaches a certain value.
- the beam pattern is changed to another beam pattern.
- the inventor has studied a wireless communication device that switches the beam pattern of an antenna in wireless communication.
- the data transmission wireless communication device changes the beam pattern of the transmission antenna under certain conditions, so that the transmission frame is received by the data reception wireless communication device.
- the wireless communication apparatus has a problem that it may be changed even if the beam pattern of the transmission antenna is not required.
- This disclosure provides a wireless communication apparatus that avoids unnecessary changes in the beam pattern of an antenna and suppresses deterioration in communication quality in order to solve the above-described conventional problems.
- the present disclosure relates to a reception unit that receives a first transmission frame transmitted from a communication partner at a reception antenna, and a first unit that indicates reception of the first transmission frame based on the first transmission frame received at the reception antenna.
- a response frame generator for generating one response frame, a transmitter for transmitting the generated first response frame from a transmission antenna, and determining whether the same first transmission frame has been retransmitted from the communication partner
- a wireless communication apparatus comprising: a determination unit; and an antenna control unit that changes a beam pattern of the transmission antenna when the same first transmission frame is retransmitted from the communication partner.
- a diagram showing a non-directional beam pattern (B) a diagram showing a pseudo-omni-directional beam pattern, (C) a plurality of (for example, three) directivities, and a main beam in any direction (D)
- a beam pattern having directivity in a specific direction is set for the transmission antenna of the data transmission wireless communication device, and the reception antenna of the data reception wireless communication device is pseudo-omnidirectional Illustration of communication example when the beam pattern is set 1 is a block diagram showing an example of an internal basic configuration of a wireless communication apparatus according to each embodiment 2A is a block diagram illustrating an example of an internal configuration of a wireless communication device that uses a retransmission bit determination unit as an example of a determination unit in the wireless communication device illustrated in FIG. 2, and FIG.
- FIG. 2B is a block diagram of the determination unit in the wireless communication device illustrated in FIG. A block diagram showing an example of an internal configuration of a wireless communication apparatus using an SN determination unit as an example
- A A flowchart for explaining an example of a procedure for setting a beam pattern of a transmission antenna of an Ack frame for a MAC frame (for example, a data frame) received by the data reception wireless communication device of the first embodiment
- B a first 6 is a flowchart for explaining another example of the setting procedure of the beam pattern of the transmitting antenna of the Ack frame for the MAC frame (for example, the data frame) received by the data receiving wireless communication apparatus of the embodiment.
- 4 is a sequence diagram illustrating an example of signaling in which the sequence number SN is changed by reaching the upper limit of the number of retransmissions in the data transmission wireless communication device and the data reception wireless communication device of the embodiment
- FIG. 4 is a sequence diagram illustrating another example of signaling in which the sequence number SN is changed by reaching the upper limit of the number of retransmissions in the data transmission wireless communication device and the data reception wireless communication device of the first embodiment.
- A Explanatory drawing which shows the example which transmission of the data frame from the data transmission radio
- B Data reception after the beam pattern was determined
- FIG. 4 is an explanatory diagram showing an example of successful transmission of an Ack frame from a wireless communication device for data transmission to a wireless communication device for data transmission;
- FIG. 6 is an explanatory diagram showing an example of successful data frame transmission;
- F a data receiving radio communication device after the data receiving radio communication device is rotated and the beam pattern of the transmitting antenna is changed; Explanatory drawing which shows the example which transmission of the Ack frame to succeeded FIG.
- 8A is a flowchart for explaining an example of an operation procedure in which a data reception wireless communication apparatus according to the first embodiment transmits a data frame using a beam pattern of a transmission antenna for transmitting an Ack frame.
- 4 is a sequence diagram illustrating an example of signaling in which a data reception wireless communication apparatus illustrated in (A) transmits a data frame using a beam pattern of a transmission antenna for transmitting an Ack frame.
- 9 is a flowchart for explaining an example of a setting procedure of a beam pattern of a transmission antenna for transmitting an Ack frame for a data frame received by a data reception wireless communication device according to the first modification of the first embodiment.
- FIG. 9 is a sequence diagram illustrating an example of signaling related to transmission of an aggregation data frame in the data transmission wireless communication device and the data reception wireless communication device according to the second embodiment.
- FIG. 7 is a flowchart for explaining an example of a setting procedure of a beam pattern of a transmission antenna for transmitting an Ack frame corresponding to a MAC frame received by a data reception wireless communication device according to the third modification of the first embodiment.
- A The figure which shows an example of the format of the conventional MAC frame
- B The figure which shows an example of the format of the conventional sequence control field
- C The figure which shows an example of the format of the conventional frame control field
- D The figure which shows an example of the format of the conventional Ack frame
- A Sequence diagram showing the concept of signaling of a single data frame between a conventional data transmission radio communication apparatus and a data reception radio communication apparatus
- B conventional data transmission radio communication apparatus and data reception Diagram showing an example of signaling of a single data frame with the wireless communication apparatus for communication
- A A diagram showing an example of a conventional A-MPDU frame format
- B a diagram showing an example of a conventional A-MPDU subframe format
- C a diagram showing an example of a diagram showing an
- FIG. 6 is a sequence diagram showing an example of signaling of a transmission aggregation frame with a communication device.
- C Another example of signaling of a transmission aggregation frame between a conventional data transmission wireless communication device and a data reception wireless communication device.
- A A flowchart for explaining an example of a procedure for setting a beam pattern of a transmission antenna of a CTS frame with respect to a MAC frame (for example, an RTS frame) received by a data reception wireless communication device according to Modification 4 of the first embodiment.
- the data transmission wireless communication device includes a wireless transmission unit and a wireless reception unit
- the data reception wireless communication device includes a wireless transmission unit and a wireless reception unit.
- the data transmission wireless communication device and the data reception wireless communication device have the same configuration, and will be described assuming, for example, direct communication.
- FIG. 18A is an explanatory diagram of a transmission cycle TR including a setting period PH1 and a communication period PH2 for setting an antenna beam pattern in conventional millimeter wave communication.
- FIG. 18B is an explanatory diagram of timing at which deterioration of the communication environment occurs in the transmission period TR including the setting period PH1 and the communication period PH2 for setting the antenna beam pattern in the conventional millimeter wave communication.
- the transmission cycle TR shown in FIG. 18A includes a setting period PH1 (Antenna ⁇ Training Phase) for setting an antenna beam pattern in millimeter wave communication and an actual communication (data transaction) period PH2 (Communication Phase). Including.
- the time width of the transmission period TR may be the same or different for each transmission cycle TR.
- the data transmission radio communication apparatus sets beam patterns of a plurality of antennas having different directivities, and transmits a directivity verification frame including information related to the antenna beam patterns to the data reception radio communication apparatus of the communication partner. Send to.
- the data reception wireless communication device After receiving the directivity verification frame, the data reception wireless communication device returns a response frame including information regarding the antenna used in the communication period PH2 to the data transmission wireless communication device. To do.
- the data transmission wireless communication device sets the beam pattern of the transmission antenna related to the communication to the data reception wireless communication device based on the response frame returned from the data reception wireless communication device. Thereby, in the setting period PH1, the beam pattern of the transmission antenna for the communication partner of the data transmission wireless communication apparatus is set.
- the communication period PH2 is shortened according to the length of the set period PH1 compared to the transmission period in which the set period PH1 is not set. Since the time width of the transmission cycle TR is unchanged, when the set period PH1 is increased, the communication period PH2 is shortened, and the usable band is reduced in the communication period PH2.
- the wireless communication device for data transmission reduces the number of times of setting the beam pattern of the transmission antenna and selects an appropriate antenna beam pattern during communication.
- Patent Document 1 when the Ack frame does not reach the data transmission wireless communication device, the following two causes can be considered as the cause of the data transmission wireless communication device retransmitting the data frame.
- the first cause is a case where the data reception wireless communication apparatus has not returned the Ack frame because the data frame did not reach the data reception wireless communication apparatus.
- the second cause is a case where the data frame has arrived at the data receiving wireless communication apparatus, but the Ack frame returned from the data receiving wireless communication apparatus has not arrived at the data transmitting wireless communication apparatus.
- Patent Document 1 when the cause of the retransmission of the data frame by the data transmission wireless communication device is the second cause described above, the beam pattern of the transmission antenna of the data transmission wireless communication device was appropriate. Nevertheless, the data transmission radio communication apparatus changes the beam pattern of the transmission antenna to another beam pattern and retransmits the data frame. For this reason, since the data transmission radio communication device makes unnecessary changes to the beam pattern of the transmission antenna, the communication quality between the data transmission radio communication device and the data reception radio communication device as the communication partner is deteriorated. There was a problem.
- the device is abbreviated as a data reception wireless communication device (see, for example, FIG. 15A or FIG. 17A).
- FIG. 14A shows an example of a conventional MAC frame format.
- FIG. 14B is a diagram illustrating an example of a format of a conventional sequence control field.
- FIG. 14C is a diagram illustrating an example of a format of a conventional frame control field.
- FIG. 14D is a diagram illustrating an example of a conventional Ack frame format.
- the wireless communication apparatus transmits and receives a MAC frame (for example, a data frame, for example, a data frame) having a format illustrated in FIG.
- the MAC frame shown in FIG. 14A includes frame control (Frame Control), duration / ID, address (Address) 1, address 2, address 3, sequence control (Sequence Control), address 4, and QoS (Quality). of Service) control, HT (High Throughput) control, frame body (Frame Body), and FCS (Frame Check Sequence) fields.
- frame control Frame Control
- Duration / ID address
- Address Address
- Sequence Control Sequence Control
- HT High Throughput
- frame body Frame Body
- FCS Flash Sequence
- the sequence control field shown in FIG. 14B includes a fragment number (Fragment Number) field and a sequence number (Sequence Number) field.
- the sequence number represents the identification number or transmission order of the MAC frame shown in FIG. 14A. For example, when the sequence number field is 12 bits, it is an integer value from 0 to 4095.
- the frame control field shown in FIG. 14C includes protocol version (Protocol Version), type (Type), subtype (Subtype), To DS (Destribution Service), From DS, More Frag, retry (Retry), and power management. (Power Management), More Data, Protected Frame, and Order fields are included.
- the retry field stores a retry bit indicating whether or not the MAC frame is retransmitted as shown in FIG. 14A. For example, if the retry bit is 1, it indicates a retransmitted MAC frame. Represents a newly transmitted MAC frame.
- the Ack frame shown in FIG. 14 (D) includes fields of frame control (FrameationControl), duration (Duration), RA (Receiver Address, receiving station address), and FCS.
- frame control FraeationControl
- Duration Duration
- RA Receiveiver Address
- FCS FCS
- MAC Header MAC header
- CSMA / CA Carrier Sense Multiple Access with Collision Avoidance
- SPCA Service Period Channel Access
- the wireless communication device for data transmission Dv11 performs carrier sense before transmitting a data frame, and starts transmitting a data frame when no carrier is detected at a predetermined specified time.
- the data transmission wireless communication device Dv11 and the data reception wireless communication device Dv12 perform a series of data frame transmissions and Ack frame responses over a certain period of time called TXOP (Transmission Opportunity) that is started by transmission of data frames. (See FIG. 15A).
- TXOP Transmission Opportunity
- the data transmission wireless communication device Dv1 determines the transmission to the data reception wireless communication device Dv2 by carrier sense, and then, for example, transmissions that are set and held in the setting period PH1 shown in FIG.
- the data frame is transmitted to the data reception wireless communication device Dv2 using the beam pattern of the antenna.
- the data reception wireless communication device Dv2 it is difficult for the data reception wireless communication device Dv2 to know in advance the time at which the data transmission wireless communication device Dv1 transmits the data frame.
- the data reception wireless communication device Dv2 since another data frame may be transmitted from another data transmission wireless communication device to the data reception wireless communication device Dv2 at the same time, the data reception wireless communication device Dv2 performs the data transmission wireless communication.
- the beam pattern of the receiving antenna is set over a wide range so that data frames transmitted from the device Dv1 and other wireless communication devices for data transmission can be received (see FIG. 1A or FIG. 1B).
- FIG. 15A is a sequence diagram showing the concept of signaling a single data frame between the conventional data transmission wireless communication device Dv11 and the data reception wireless communication device Dv12.
- the data reception wireless communication device Dv12 correctly receives the data frame transmitted by the data transmission wireless communication device Dv11, the data reception wireless communication device Dv12 transmits an Ack frame as a response frame for data transmission within a predetermined period called max ack delay. Responds to the wireless communication device Dv11.
- the data transmission wireless communication device Dv11 determines that the data frame transmitted by the data transmission wireless communication device Dv11 is correctly received by the data reception wireless communication device Dv12, and does not receive the Ack frame. Thus, it is determined that the data frame transmitted by the data transmission wireless communication device Dv11 has not been correctly received by the data reception wireless communication device Dv12.
- the data transmission wireless communication device Dv11 determines transmission of the next data frame, increments the sequence number (SN) assigned to each data frame, and sets the retry bit to 0.
- the sequence number is managed in association with the address of the data transmission wireless communication device Dv11, the address of the data reception wireless communication device Dv12, and TID (Traffic Identifier).
- the wireless communication device for data transmission Dv11 does not receive the Ack frame, it retransmits the same data frame. However, the sequence number of the data frame to be retransmitted is not changed, and the retry bit is set to 1 (see FIG. 15B).
- FIG. 15B is a sequence diagram showing an example of signaling of a single data frame between the conventional data transmission wireless communication device Dv11 and the data reception wireless communication device Dv12. If the data transmission wireless communication device Dv11 does not correctly receive the Ack frame corresponding to the transmitted data frame, for example, the data transmission wireless communication device Dv11 holds a data frame in which the sequence number is 1 and the retry bit is set to 1. Retransmit to device Dv12.
- the data transmission wireless communication device Dv11 does not correctly receive the Ack frame again after transmitting the data frame having the sequence number set to 1 and the retry bit set to 1 to the data reception wireless communication device Dv12. In this case, the data frame is retransmitted. Further, the data transmission wireless communication device Dv11 counts the number of retransmissions, and does not perform retransmissions exceeding a predetermined upper limit number. Further, when it is determined that the transmission of the data frame to be retransmitted is successful, the data transmission wireless communication device Dv11 resets the counter of the number of retransmissions.
- FIG. 16A is a diagram showing an example of a conventional A-MPDU frame format.
- FIG. 16B is a diagram illustrating an example of a conventional A-MPDU subframe format.
- FIG. 16C is a diagram illustrating an example of a format of a conventional block Ack frame.
- the wireless communication apparatus according to the second embodiment transmits and receives an aggregation frame (Aggregation frame, A-MPDU: Aggregate medium access control protocol data unit, for example) shown in FIG.
- Aggregation frame A-MPDU: Aggregate medium access control protocol data unit, for example
- the aggregation frame shown in FIG. 16A includes each field of a plurality of A-MPDU subframes (A-MPDU subframes).
- the A-MPDU subframe shown in FIG. 16B includes MPDUMdelimiter as delimiter information of the A-MPDU subframe, the MPDU similar to the MAC frame shown in FIG. 14A, and adjustment padding fields. .
- the block Ack frame shown in FIG. 16C represents frame control (Frame Control), duration (Duration) / ID, RA (Receiver Address) indicating the reception destination address of the block Ack frame, and the transmission destination address of the block Ack frame.
- Each field includes TA (Transmission Address), BA control (Block Ack Control), BA information (Block Ack Information), and FCS.
- MAC Header MAC Header is configured by fields other than BA control, BA information, and FCS.
- MAC frames having a plurality of sequence numbers are once transmitted by the transmission of the aggregation frame (A-MPDU) shown in FIG. 16A and the response of the block Ack frame indicating the reception of the aggregation frame.
- a method of transmitting and receiving data is also known.
- the data reception wireless communication device Dv12 correctly receives (Ack) or does not correctly receive a plurality of data frames (MPDU) concatenated as aggregation frames by returning a block Ack frame (Nack (No Acknowledge). )) At a time (see FIG. 17A).
- FIG. 17A is a sequence diagram showing the concept of transmission aggregation frame signaling between a conventional data transmission wireless communication device and a data reception wireless communication device.
- the data reception wireless communication device Dv12 correctly receives a data frame (MPDU) with a sequence number of all or part of the aggregation frames transmitted by the data transmission wireless communication device Dv11, the data reception wireless communication device Dv12 has a predetermined value called max ack delay.
- the block Ack frame as a response frame is responded to the data transmission wireless communication device Dv11 within the period.
- the data transmission wireless communication device Dv11 receives the block Ack frame, so that data frames (MPDUs) of part or all of the sequence numbers of the aggregation frames transmitted by the data transmission wireless communication device Dv11 are data reception wireless. It is determined that the communication device Dv12 has correctly received it, and the block Ack frame is not received, so that it is determined that the aggregation frame transmitted by the data transmission wireless communication device Dv11 has not been correctly received by the data reception wireless communication device Dv12.
- the data transmission wireless communication device Dv11 When the data transmission wireless communication device Dv11 is able to receive the block Ack frame, the data transmission wireless communication device Dv11 analyzes the content of the block Ack frame, analyzes the sequence number of the correctly received data frame (MPDU), and the data frame that is not correctly received. The sequence number of (MPDU) is determined. According to the determination result, the data transmission wireless communication device Dv11 receives an aggregation frame including a sequence number of a data frame (MPDU) that has not been correctly received and a sequence number of a data frame (MPDU) to be newly transmitted. (See FIG. 17C).
- the data transmission wireless communication device Dv11 when the data transmission wireless communication device Dv11 does not receive the block Ack frame, it retransmits the same aggregation frame (see FIG. 17B).
- FIG. 17B is a sequence diagram illustrating an example of signaling of a transmission aggregation frame between a conventional wireless communication device for data transmission and a wireless communication device for data reception.
- FIG. 17C is a sequence diagram showing another example of signaling of a transmission aggregation frame between a conventional data transmission wireless communication device and a data reception wireless communication device.
- the wireless communication device of each embodiment performs wireless communication with a wireless communication device of a communication partner using, for example, a millimeter wave (for example, 60 [GHz]) defined in the IEEE 802.11ad communication standard.
- a wireless communication device that transmits data in each embodiment hereinafter abbreviated as “data transmission wireless communication device”
- a wireless communication device that receives data in each embodiment hereinafter, referred to as “data transmission wireless communication device”.
- “Abbreviated as“ data receiving wireless communication device ”) has the same configuration and will be described on the assumption of direct communication, for example.
- the data transmission wireless communication device includes a wireless transmission unit and a wireless reception unit
- the data reception wireless communication device includes a wireless transmission unit and a wireless reception unit.
- FIG. 1A shows a non-directional beam pattern PA1.
- FIG. 1B is a diagram showing a pseudo-omnidirectional beam pattern PA2.
- FIG. 1C is a diagram showing a beam pattern PA3 having a plurality of (for example, three) directivities and having a main beam formed in any direction.
- a beam pattern PA3 having directivity in a specific direction is set for the transmission antenna of the data transmission wireless communication device Dv1
- the reception antenna of the data reception wireless communication device Dv2 is a pseudo-omnidirectional beam. It is explanatory drawing of the example of communication when the pattern PA2 is set.
- the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 change the beam pattern of each transmission antenna or reception antenna to an omni beam pattern PA. (See FIG. 1A) or a quasi-omni beam pattern PA2.
- the directivity of the beam pattern having the maximum half-value width of the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2 is referred to as pseudo-omni-direction (quasi-omni). Therefore, the pseudo-omnidirectional beam pattern PA2 has a shorter frame reach or reception distance but a larger half-value width than the beam pattern PA3 having directivity in a specific direction shown in FIG.
- the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 form a beam pattern of each transmission antenna or reception antenna and form a main beam in a specific direction. It is also possible to set the beam pattern PA3 (see FIG. 1C).
- the transmission antenna of the data transmission wireless communication device Dv1 is set to a beam pattern PA3 in which a main beam is formed in a specific direction, and the reception antenna of the data reception wireless communication device Dv2 is pseudo-nothing.
- the directivity beam pattern PA2 is set, the MAC frame or the aggregation frame transmitted by the data transmission wireless communication device Dv1 is received by the data reception wireless communication device Dv2.
- the data transmission wireless communication device Dv1 transmits the MAC frame shown in FIG. 14A, and the data reception wireless communication device Dv2 responds with an Ack frame indicating that the MAC frame has been received. A case will be described.
- FIG. 2 is a block diagram illustrating an example of an internal basic configuration of the wireless communication device 1 of each embodiment.
- the wireless communication device 1 illustrated in FIG. 2 receives a MAC frame transmitted from, for example, another wireless communication device that is a communication partner (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2), and receives the MAC frame.
- a communication partner for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2
- This is a configuration that assumes a data reception wireless communication device that responds with an Ack frame indicating reception of.
- the wireless communication device 1 illustrated in FIG. 2 includes a wireless reception unit 11 to which a reception antenna ARX is connected, a response necessity determination unit 12, a response frame generation unit 13, and a transmission antenna ATX.
- a wireless transmission unit 14, a determination unit 15, and an antenna control unit 16 are included.
- the reception antenna ARX has a communication period PH2 (see FIG. 18A) with another wireless communication device (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2) that is a communication partner before starting.
- the beam pattern is set. That is, the receiving antenna ARX is set and held with a beam pattern having a predetermined directivity by the beamforming technique in accordance with the antenna control signal output from the antenna control unit 16.
- the reception antenna ARX uses a held beam pattern to transmit a MAC frame (for example, a data frame) or an Ack frame transmitted by another wireless communication device (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2). Is output to the wireless reception unit 11.
- a MAC frame for example, a data frame
- an Ack frame transmitted by another wireless communication device (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2). Is output to the wireless reception unit 11.
- the reception antenna ARX corresponds to the antenna control signal output by the antenna control unit 16 during the communication period PH2 with another wireless communication device (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2).
- another wireless communication device for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2.
- the transmission antenna ATX is communicated with another wireless communication device that is a communication partner (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2) before the communication period PH2 (see FIG. 18A) starts.
- the beam pattern is set. That is, the transmission antenna ATX is set and held with a beam pattern having a predetermined directivity by the beamforming technique according to the antenna control signal output from the antenna control unit 16.
- the transmission antenna ATX uses a held beam pattern to transmit a MAC frame (for example, a data frame) or an Ack frame transmitted by another wireless communication device (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2). Send.
- a MAC frame for example, a data frame
- an Ack frame transmitted by another wireless communication device
- the transmission antenna ATX corresponds to the antenna control signal output by the antenna control unit 16 during the communication period PH2 with another wireless communication device (for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2).
- another wireless communication device for example, the data transmission wireless communication device Dv1 or the data reception wireless communication device Dv2.
- the radio reception unit 11 converts the MAC frame or Ack frame signal in the carrier frequency band received by the reception antenna ARX into a baseband signal and demodulates it.
- the wireless reception unit 11 receives the demodulated MAC frame destination address (see, for example, the address 1 (Address1) field shown in FIG. 14A) or the Ack frame receiving station address (eg, RA (shown in FIG. 14D)). If the field (Receiver Address) matches the MAC address of the local station, it is determined that the frame is addressed to the local station.
- the wireless reception unit 11 After determining that the MAC frame or Ack frame is addressed to the own station, the wireless reception unit 11 determines whether the value calculated based on the content of the MAC frame or Ack frame matches the FCS value. judge. When the wireless reception unit 11 determines that the value calculated based on the contents of the MAC frame or the Ack frame and the FCS (for example, CRC32 (Cyclic Redundancy Code 32)) match, It is determined that it has been received.
- the FCS for example, CRC32 (Cyclic Redundancy Code 32)
- the wireless reception unit 11 After determining that the MAC frame or the Ack frame has been correctly received, the wireless reception unit 11 outputs the MAC frame or the Ack frame to the response necessity determination unit 12 and the determination unit 15.
- the wireless reception unit 11 receives the MAC frame or the Ack frame, but is not the MAC frame or the Ack frame addressed to itself, or the value calculated based on the contents of the MAC frame or the Ack frame and the value of the FCS Are determined not to match, it is determined that the MAC frame or the Ack frame has not been received correctly.
- the wireless reception unit 11 discards the MAC frame or the Ack frame and waits for the next reception.
- the response necessity determination unit 12 is a frame type of the MAC frame demodulated by the wireless reception unit 11 (see, for example, the type or subtype field shown in FIG. 14A), or a response type (for example, FIG. 14 (A), refer to the QoS control field) to determine whether an Ack frame response indicating reception of the MAC frame is necessary.
- the response necessity determination unit 12 outputs the MAC frame demodulated by the wireless reception unit 11 to an upper layer (not shown) of the wireless communication device 1, and the response frame generation unit 13 displays the determination result of whether or not an Ack frame response is required. To the determination unit 15 and the antenna control unit 16. When the response necessity determination unit 12 determines that the response of the Ack frame is unnecessary, the wireless communication device 1 does not respond with the Ack frame indicating reception of the MAC frame.
- the response frame generation unit 13 generates an Ack frame indicating reception of the MAC frame and outputs it to the wireless transmission unit 14 when the response necessity determination unit 12 determines that an Ack frame response is required.
- the wireless transmission unit 14 converts the Ack frame generated by the response frame generation unit 13 into a signal of a predetermined carrier frequency band and transmits the signal from the transmission antenna ATX.
- the wireless transmission unit 14 responds with an Ack frame after elapse of a predetermined time (for example, SIFS: Short : Inter Frame Space in IEEE 802.11) from the time when the MAC frame is received by the receiving antenna ARX. Thereby, the wireless communication apparatus 1 can report to the communication partner that the MAC frame transmitted from the communication partner has been correctly received.
- SIFS Short : Inter Frame Space in IEEE 802.11
- the determination unit 15 uses the same MAC address from the communication partner of the wireless communication device 1 based on the MAC frame demodulated by the wireless reception unit 11. It is determined whether or not the frame has been retransmitted.
- the determination unit 15 is configured using, for example, the retransmission bit determination unit 15A of the wireless communication device 1A illustrated in FIG. 3A or the SN determination unit 15B of the wireless communication device 1B illustrated in FIG.
- FIG. 3A is a block diagram illustrating an example of the internal configuration of the wireless communication device 1A using the retransmission bit determination unit 15A as an example of the determination unit 15 in the wireless communication device 1 illustrated in FIG.
- FIG. 3B is a block diagram illustrating an example of an internal configuration of the wireless communication device 1B using the SN determination unit 15B as an example of the determination unit 15 in the wireless communication device 1 illustrated in FIG.
- the retransmission bit determination unit 15A in the wireless communication device 1A has a retry bit in the retry field of the MAC frame demodulated by the wireless reception unit 11 (for example, the retry shown in FIG. 14A), indicating 1 or new transmission. It is determined whether it is 0, and the determination result is output to the transmission antenna control unit 16T of the antenna control unit 15.
- the beam patterns of the transmission antenna ATX of the data transmission wireless communication device Dv1 and the transmission antenna ARX of the data reception wireless communication device Dv2 are: It can be determined that the beam pattern set in the setting period PH1 is effective.
- the MAC frame is 1 from the data transmission wireless communication device Dv1 which is the communication partner.
- the data reception wireless communication device Dv2 has retransmitted more than once and returned an Ack frame indicating correct reception of the MAC frame, but the returned Ack frame has been correctly received by the data transmission wireless communication device Dv1 which is the communication partner. There will be no.
- the beam pattern is set in the setting period PH1, and the beam pattern of the transmission antenna ATX of the data reception wireless communication device Dv2 used for returning the Ack frame and the beam pattern of the reception antenna ARX of the data transmission wireless communication device Dv1 Is not considered appropriate.
- the SN determination unit 15B in the wireless communication device 1B includes the sequence number of the sequence control field of the MAC frame demodulated by the wireless reception unit 11, and the sequence number of the sequence control field of the MAC frame previously received and demodulated by the wireless reception unit 11. And the determination result is output to the transmission antenna control unit 16T of the antenna control unit 16.
- the data reception wireless communication device Dv2 duplicates the same MAC frame.
- the same MAC frame has been retransmitted from the data transmission wireless communication device Dv1 that is received, that is, the communication partner.
- the beam pattern set in the setting period PH1 is effective for the beam pattern of the transmission antenna ATX of the data transmission wireless communication device Dv1 and the transmission antenna ARX of the data reception wireless communication device Dv2.
- the beam pattern is set in the setting period PH1, and the beam patterns of the transmission antenna ATX of the data reception wireless communication device Dv2 and the reception antenna ARX of the data transmission wireless communication device Dv1 used for returning the Ack frame are Inappropriate.
- the SN determination unit 15B sets the sequence number as the destination address (see, for example, address 1 shown in FIG. 14A) or the receiving station address (see, for example, RA as shown in FIG. 14D), and the logical link identifier. Management is performed in association with all or some of the pairs with the indicated TID (Traffic Identifier).
- the SN determination unit 15B stores the sequence number of the MAC frame previously received by the wireless communication device 1B.
- the sequence number of the previously received MAC frame stored by the SN determination unit 15B is abbreviated as “storage SN”, and the MAC frame received by the receiving antenna ARX. Is abbreviated as “reception SN”.
- the antenna control unit 16 includes a transmission antenna control unit 16T and a reception antenna control unit 16R. 2 will be described as including the transmission antenna control unit 16T and the reception antenna control unit 16R illustrated in FIG. 3A or 3B. However, the antenna control unit 16 may be a transmission antenna. You may control the beam pattern of ATX and the receiving antenna ARX.
- the transmission antenna control unit 16T sets and holds the beam pattern of the transmission antenna ATX in the setting period PH1 before the communication period PH2 (see FIG. 18A) with the communication partner starts.
- the transmission antenna control unit 16T determines that the retransmission bit determination unit 15A determines that the retry bit in the retry field of the MAC frame is 1, that is, if the same MAC frame has been transmitted or retransmitted before.
- the beam pattern of the transmitting antenna ATX used for the response of the Ack frame is changed.
- the transmission antenna control unit 16T determines that the initial transmission of a new MAC frame has been received, the transmission antenna control unit 16T enters the set period PH1. The beam pattern of the transmission antenna ATX used for the response of the set Ack frame is held.
- the transmission antenna control unit 16T holds the beam pattern of the transmission antenna ATX set in the set period PH1 when the response necessity determination unit 12 determines that the response of the Ack frame is unnecessary.
- the reception antenna control unit 16R sets and holds the beam pattern of the reception antenna ARX in the setting period PH1 before the communication period PH2 (see FIG. 18A) with the communication partner starts. Although details will be described later, the reception antenna control unit 16R changes or holds the beam pattern of the reception antenna ARX according to the determination result of the response necessity determination unit 12, the retransmission bit determination unit 15A, or the SN determination unit 15B. May be.
- FIG. 4A is a flowchart for explaining an example of a procedure for setting the beam pattern of the transmission antenna ATX of the Ack frame with respect to the MAC frame (for example, data frame) received by the data reception wireless communication device Dv2 of the first embodiment. is there.
- FIG. 4B illustrates another example of the setting procedure of the beam pattern of the transmission antenna ATX of the Ack frame for the MAC frame (for example, the data frame) received by the data reception wireless communication device Dv2 according to the first embodiment. It is a flowchart.
- FIG. 4A explains that the wireless communication device 1A (data reception wireless communication device Dv2) shown in FIG. 3A has correctly received a MAC frame (for example, a data frame), and FIG. It is assumed that the wireless communication device 1B (data receiving wireless communication device Dv2) shown in FIG. 3B has correctly received a MAC frame (for example, a data frame) (P1).
- the response necessity determination unit 12 determines whether an Ack frame response indicating correct reception of the MAC frame is necessary based on the frame type or response type of the MAC frame demodulated by the wireless reception unit 11. (P2).
- the response necessity determination unit 12 outputs the determination result to the response frame generation unit 13, the retransmission bit determination unit 15A, and the transmission antenna control unit 16T.
- the transmission antenna control unit 16T holds the beam pattern of the transmission antenna ATX (P3) when the response necessity determination unit 12 determines that the response of the Ack frame is unnecessary (P2, NO).
- the response frame generation unit 13 When the response necessity determination unit 12 determines that a response of the Ack frame is necessary (P2, YES), the response frame generation unit 13 generates an Ack frame indicating reception of the MAC frame and generates a wireless transmission unit 14 Output to.
- the retransmission bit determination unit 15A determines the retry bit in the retry field of the MAC frame demodulated by the wireless reception unit 11 Is 1 indicating retransmission or 0 indicating new transmission (P4). Retransmission bit determination unit 15A outputs the determination result to transmission antenna control unit 16T.
- the transmission antenna control unit 16T uses the beam pattern of the transmission antenna ATX used for the response of the Ack frame. Is held (P5).
- the wireless transmission unit 14 transmits the Ack frame generated by the response frame generation unit 13 to the communication partner using the beam pattern of the transmission antenna ATX held in Step P5 (P6).
- the transmission antenna control unit 16T sets the transmission antenna ATX used for the response of the Ack frame.
- the beam pattern is changed (P7).
- the wireless transmission unit 14 transmits the Ack frame generated by the response frame generation unit 13 to the communication partner using the beam pattern of the transmission antenna ATX after the change in Step P7 (P8).
- the operation of the wireless communication device 1A after step P3, step P6, or step P8 returns to step P1.
- the SN determination unit 15B has the same storage SN and reception SN when the response necessity determination unit 12 determines that an Ack frame response is required (P2, YES). (P4A).
- the SN determination unit 15B stores the received SN regardless of the determination result of step P4A (P9, P10).
- the transmission antenna control unit 16T holds the beam pattern of the transmission antenna ATX used for the response of the Ack frame when the SN determination unit 15B determines that the storage SN and the reception SN do not match (P5). ).
- the wireless communication device 1B determines that the beam pattern of the transmission antenna ATX used for the response of the previous Ack frame is appropriate, and the beam pattern of the transmission antenna ATX does not need to be changed.
- the transmission antenna control unit 16T changes the beam pattern of the transmission antenna ATX used for the response of the Ack frame when the SN determination unit 15B determines that the storage SN and the reception SN match. (P7).
- the wireless communication device 1B determines that the beam pattern of the transmission antenna ATX used for the response of the previous Ack frame is inappropriate and the beam pattern of the transmission antenna ATX needs to be changed.
- FIG. 5A, FIG. 5B, FIG. 6A, and FIG. 6B for an example of signaling when the wireless communication apparatuses of the present embodiment directly perform wireless communication. I will explain.
- FIGS. 5B, 6A, and 6B the same operations as those illustrated in FIG. 5A are denoted by the same reference numerals, and description thereof is omitted or simplified. The contents will be described.
- FIG. 5A is a sequence diagram illustrating an example of signaling in which the sequence number SN is changed by receiving an Ack frame in the data transmission wireless communication device and the data reception wireless communication device of the first embodiment.
- FIG. 5B is a sequence diagram illustrating an example of signaling in which the sequence number SN is changed by reaching the upper limit of the number of retransmissions in the data transmission wireless communication device and the data reception wireless communication device of the first embodiment. .
- FIG. 6A is a sequence diagram illustrating another example of signaling in which the sequence number SN is changed by receiving an Ack frame in the data transmission wireless communication device and the data reception wireless communication device according to the first embodiment. is there.
- FIG. 6B is a sequence diagram illustrating another example of signaling in which the sequence number SN is changed by reaching the upper limit of the number of retransmissions in the data transmission wireless communication device and the data reception wireless communication device of the first embodiment. It is.
- a wireless communication device that transmits data according to the present embodiment is described as a data transmission wireless communication device Dv1
- a wireless communication device that receives data according to the present embodiment is described as a data reception wireless communication device Dv2.
- FIGS. 6A and 6B show operations of the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 having the configuration of the wireless communication device 1A shown in FIG. 3 (A). The operations of the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 having the configuration of the wireless communication device 1B shown in FIGS. 6A and 6B are shown.
- the data reception wireless communication device Dv2 correctly receives the MAC frame (for example, data frame) transmitted from the data transmission wireless communication device Dv1, and transmits the Ack frame using the beam pattern (for example, PtA) of the transmission antenna ATX. Transmit to the trusted wireless communication device Dv1 (S1). However, in step S1, the Ack frame does not reach the data transmission wireless communication device Dv1 (S1).
- the data reception wireless communication device Dv2 correctly receives the data frame retransmitted from the data transmission wireless communication device Dv1, changes the beam pattern of the transmission antenna ATX from, for example, the beam pattern PtA to the beam pattern PtB, and changes the Ack frame.
- the data is transmitted to the wireless communication device Dv1 for data transmission (S2).
- the data reception wireless communication device Dv2 correctly receives the data frame transmitted from the data transmission wireless communication device Dv1 in step S4, and uses the beam pattern PtB of the transmission antenna ATX after the change in step S2 to generate the Ack frame.
- the data is transmitted to the wireless communication device for data transmission Dv1 (S4).
- the Ack frame transmitted in step S4 is the data transmission wireless if the communication environment between the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 and the beam pattern of each antenna are appropriate.
- the communication device Dv1 receives the signal correctly.
- the data reception wireless communication device Dv2 correctly receives the data frame retransmitted from the data transmission wireless communication device Dv1, changes the beam pattern of the transmission antenna ATX from, for example, the beam pattern PtA to the beam pattern PtB, and changes the Ack frame.
- the data is transmitted to the data transmission wireless communication device Dv1 (S5).
- the Ack frame does not reach the data transmission wireless communication device Dv1 (S5).
- step S6 the data reception wireless communication device Dv2 changes the beam pattern of the transmission antenna ATX from, for example, the beam pattern PtB to the beam pattern PtC, and transmits the Ack frame to the data transmission wireless communication device Dv1 (S6). ). However, in step S6, the Ack frame does not reach the data transmission wireless communication device Dv1 (S6).
- the Ack frame is transmitted to the data transmission wireless communication device Dv1 using the beam pattern PtC set in (S8). However, in step S8, the Ack frame does not reach the data transmission wireless communication device Dv1 (S8).
- step S8 the data reception wireless communication device Dv2 transmits an Ack frame using the same beam pattern PtC as that in step S6 as the beam pattern of the transmission antenna ATX. This is because the determination in step S7 by the data transmission wireless communication device Dv1 is unknown to the data reception wireless communication device Dv2, and therefore the data reception wireless communication device Dv2 changes the sequence number to 2 in step S8. It is difficult to determine whether the cause is due to the arrival of the Ack frame or the achievement of the upper limit of the number of retransmissions in step S7.
- step S8 the data reception wireless communication apparatus Dv2 uses the same beam pattern as that used in step S6 to transmit the Ack frame in step S8, so whether or not the transmission by the beam pattern PtC arrives again.
- the procedure to try By this procedure, an unnecessary period can be shortened by trying all beam patterns in step S8.
- the data reception wireless communication device Dv2 correctly receives the data frame retransmitted from the data transmission wireless communication device Dv1, changes the beam pattern of the transmission antenna ATX from, for example, the beam pattern PtC to the beam pattern PtD, and changes the Ack frame.
- the data is transmitted to the data transmission wireless communication device Dv1 (S9).
- the Ack frame transmitted in step S9 is the data transmission wireless if the communication environment between the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 and the beam pattern of each antenna are appropriate.
- the communication device Dv1 receives the signal correctly.
- 6A and 6B differs from the sequence diagrams in FIGS. 5A and 5B in that the data reception wireless communication device Dv2 has the same data frame. This is a method for determining whether or not it has been retransmitted, and since the contents other than the determination method are the same, description thereof will be omitted.
- the data reception wireless communication device Dv2 correctly receives the data frame transmitted from the data transmission wireless communication device Dv1, and requires a response of the Ack frame. If it is determined that the storage SN and the reception SN are not the same, the Ack frame is transmitted using the beam pattern of the set transmission antenna ATX.
- FIGS. 7A, 7B, 7C, and 7D an example of the beam pattern of each antenna when the wireless communication apparatuses of the present embodiment directly wirelessly communicate with each other is illustrated in FIGS. 7A, 7B, 7C, and 7D. ) And FIG. 7 (E) and FIG. 7 (F).
- FIG. 7A is an explanatory diagram showing an example of successful transmission of a data frame from the data transmission wireless communication device Dv1 to the data reception wireless communication device Dv2 after the beam pattern is determined.
- FIG. 7B is an explanatory diagram illustrating an example in which the Ack frame is successfully transmitted from the data reception wireless communication device Dv2 to the data transmission wireless communication device Dv1 after the beam pattern is determined.
- FIG. 7C is an explanatory diagram showing an example in which the data frame is successfully transmitted from the data transmission wireless communication device Dv1 to the data reception wireless communication device Dv2 after the data reception wireless communication device Dv2 rotates.
- FIG. 7D is an explanatory diagram illustrating an example in which transmission of an Ack frame fails from the data reception wireless communication device Dv2 to the data transmission wireless communication device Dv1 after the data reception wireless communication device Dv2 rotates.
- FIG. 7E is an explanatory diagram showing an example of successful transmission of a data frame from the data transmission wireless communication device Dv1 to the data reception wireless communication device Dv2 after the data reception wireless communication device Dv2 rotates.
- FIG. 7F shows an Ack frame from the data reception wireless communication device Dv2 to the data transmission wireless communication device Dv1 after the data reception wireless communication device Dv2 rotates and the beam pattern of the transmission antenna ATX is changed. It is explanatory drawing which shows the example in which transmission of was successful.
- the beam pattern of the transmission antenna ATX of the data transmission wireless communication device Dv1 is indicated by a thick solid line, and the reception antenna of the data reception wireless communication device Dv2 is shown.
- the ARX beam pattern is indicated by a thick dotted line.
- FIG. 7B, FIG. 7D, and FIG. 7F the beam pattern of the reception antenna ARX of the data transmission wireless communication device Dv1 is indicated by a thick dotted line, and the transmission antenna of the data reception wireless communication device Dv2 is shown.
- the beam pattern of ATX is shown by a thick solid line.
- the combination of the beam pattern of the transmission antenna ATX of the data transmission wireless communication device Dv1 and the beam pattern of the reception antenna ARX of the data reception wireless communication device Dv2 is partially overlapped. To do. For this reason, in FIG. 7A, the data frame transmitted by the data transmission wireless communication device Dv1 is received by the data reception wireless communication device Dv2. Further, in FIG. 7B, the combination of the beam pattern of the reception antenna ARX of the data transmission wireless communication device Dv1 and the beam pattern of the transmission antenna ATX of the data reception wireless communication device Dv2 partially overlaps. Therefore, the Ack frame transmitted by the data reception wireless communication device Dv2 is received by the data transmission wireless communication device Dv1.
- the combination of the beam pattern of the reception antenna ARX of the data transmission wireless communication device Dv1 and the beam pattern of the transmission antenna ATX of the data reception wireless communication device Dv2 do not overlap. Therefore, the Ack frame transmitted by the data reception wireless communication device Dv2 is not received by the data transmission wireless communication device Dv1, and the data reception wireless communication device Dv2 uses the beam pattern of the transmission antenna ATX used for transmitting the Ack frame. change.
- FIG. 7E the state where the data reception wireless communication device Dv2 is rotated will be described in the same manner as in FIGS. 7 (C) and 7 (D).
- FIG. 7E the combination of the beam pattern of the transmission antenna ATX of the data transmission wireless communication device Dv1 and the beam pattern of the reception antenna ARX of the data reception wireless communication device Dv2 partially overlaps.
- the data frame transmitted by the data transmission wireless communication device Dv1 is received by the data reception wireless communication device Dv2.
- the wireless communication device 1 when the wireless communication device 1 according to the present embodiment correctly receives a MAC frame (for example, a data frame) transmitted from a communication partner and determines that an Ack frame response indicating a response of the MAC frame is necessary. Determines whether the same MAC frame has been retransmitted from the communication partner by comparing the contents of the retry bit of the MAC frame or comparing the stored SN and the received SN.
- a MAC frame for example, a data frame
- the wireless communication device 1 determines that the beam pattern of the transmission antenna ATX used for transmitting the previously transmitted Ack frame is not appropriate, and transmits the transmission antenna. Change the ATX beam pattern. The wireless communication device 1 transmits an Ack frame using the changed beam pattern.
- the wireless communication device 1 does not change the beam pattern of the transmission antenna ATX used for transmitting the Ack frame unless the same MAC frame is retransmitted from the communication partner, and is transmitted when the same MAC frame is retransmitted. Since the beam pattern of the antenna ATX is changed, unnecessary change of the beam pattern of the transmission antenna ATX can be avoided. Therefore, since the wireless communication apparatus 1 can recover the communication path at an early stage, it is possible to suppress deterioration of the communication environment (communication quality) with the communication partner. That is, since the wireless communication device 1 can reduce the unnecessary occupation time of the communication band, it can improve the effective throughput and further reduce the power consumption and the time required for connection to the communication partner.
- the wireless communication device 1 can determine whether the same MAC frame has been retransmitted from the communication partner based on the sequence number of the MAC frame. For example, the MAC frame has a format that does not include a retry bit. Whether or not the MAC frame is retransmitted can be determined corresponding to Note that if the wireless communication device 1 has the same source address and receives a MAC frame that indicates retransmission for a plurality of times within a certain time, the previously transmitted Ack frame has not arrived. It may be determined that
- the wireless communication device 1 sets the retry bit of the MAC frame transmitted from the communication partner in the communication period PH2 after a predetermined period has elapsed since the set period PH1 shown in FIG. Even when 0, the beam pattern of the transmitting antenna ATX used for transmitting the Ack frame may be changed.
- the wireless communication apparatus 1 can recover the communication path with the communication partner at an early stage by changing the beam pattern of the transmission antenna ATX used for transmitting the Ack frame.
- the predetermined fixed period is a time for the wireless communication apparatus 1 to increment the MAC frame sequence number by one, for example.
- the wireless communication apparatus 1 accurately performs a quick sequence number increment process due to the arrival of the Ack frame at the communication partner and a sequence number increment process after a predetermined time has elapsed after the retransmission of the MAC frame due to the non-arrival of the Ack frame. Therefore, retransmission of the same MAC frame can be determined with high accuracy, and the beam pattern of the transmission antenna ATX can be appropriately changed.
- the wireless communication device 1 when the retry bit of the MAC frame (for example, data frame) transmitted from the communication partner by the wireless communication device 1 is 0 or the sequence number changes, the wireless communication device 1 It is considered that the beam pattern of the transmission antenna ATX used for frame transmission was appropriate at the time of transmission of the Ack frame.
- the wireless communication apparatus 1 may use the beam pattern of the transmission antenna ATX at the time of transmitting the Ack frame (FIG. 8A and FIG. 8). (See FIG. 8B).
- the time from the transmission of the Ack frame to the transmission of the MAC frame depends on the communication environment, it is expected to be about several tens of ⁇ s to several tens of ms, and the set period PH1 shown in FIG. The period is sufficiently shorter than (for example, several tens ms to several hundred ms).
- FIG. 8A is a flowchart illustrating an example of an operation procedure in which the data reception wireless communication device Dv2 according to the first embodiment transmits a data frame using the beam pattern of the transmission antenna ATX for transmitting an Ack frame. It is.
- FIG. 8B is a sequence diagram illustrating an example of signaling in which the data reception wireless communication device Dv2 illustrated in FIG. 8A transmits a data frame using the beam pattern of the transmission antenna ATX for transmitting an Ack frame. It is. Note that in FIG. 8A, description of the same operation as that illustrated in FIG. 4B is omitted or simplified by using the same reference numerals, and different contents will be described.
- the wireless transmission unit 14 transmits a MAC frame (for example, a data frame) to the communication partner using the beam pattern of the transmission antenna ATX held in step P5 (P11). .
- a MAC frame for example, a data frame
- the data reception wireless communication device Dv2 uses the beam pattern of the transmission antenna ATX used in step S4 for the data transmission wireless communication device Dv2. It transmits to Dv1 (S10).
- the wireless communication device 1 data reception wireless communication device Dv2 responds with an Ack frame indicating reception of the MAC frame transmitted from the communication partner, and transmits the beam pattern of the transmission antenna ATX for transmitting the data frame. Therefore, the setting period PH1 for the data receiving wireless communication device Dv2 to transmit the MAC frame can be omitted, and the procedure and time for setting the setting period PH1 can be omitted. Therefore, effective throughput can be improved.
- the cause that the retry bit of the MAC frame has changed from 1 to 0 or the sequence number has changed is that the data transmission wireless communication device Dv1 has It is not distinguished whether the Ack frame has been correctly received or the number of retransmissions of the MAC frame retransmitted by the data transmission wireless communication device Dv1 has reached a predetermined number of retransmissions.
- the first modification when it is determined that the data reception wireless communication device Dv2 corresponds to one of the following four cases, for example, the MAC It is determined that the retry bit of the frame has changed from 1 to 0 or that the sequence number has changed because the number of retransmissions of the MAC frame has reached a predetermined upper limit. In other words, the data reception wireless communication device Dv2 changes without holding the beam pattern of the transmission antenna ATX used for transmitting the Ack frame (see FIG. 9).
- the data reception wireless communication device Dv2 receives the same number of retransmissions of the same MAC frame until receiving a notification from the data transmission wireless communication device Dv1 that the number of retransmissions has reached a predetermined upper limit number. Count.
- the data reception wireless communication device Dv2 matches the counted number of reception times with the upper limit number of retransmissions, and further, for example, when the retry bit of the MAC frame changes from 1 to 0, or when the sequence number changes, It is determined that the cause is that the number of retransmissions of the frame has reached a predetermined upper limit.
- the data reception wireless communication device Dv2 is transmitted from the data transmission wireless communication device Dv1 until receiving a notification from the data transmission wireless communication device Dv1 that the number of retransmissions has reached a predetermined upper limit number.
- the data reception wireless communication device Dv2 matches the acquired number of retransmissions with the upper limit number of retransmissions, and further, for example, when the retry bit of the MAC frame changes from 1 to 0, or when the sequence number changes, It is determined that the cause is that the number of retransmissions reaches the predetermined upper limit.
- the data reception wireless communication device Dv2 acquires information on the remaining number of times that can be retransmitted included in the MAC frame transmitted from the data transmission wireless communication device Dv1.
- the data reception wireless communication device Dv2 when the acquired remaining number of retransmissions is 0, and the retry bit of the MAC frame is changed from 1 to 0, or when the sequence number is changed, the number of retransmissions of the MAC frame Is determined to be caused by reaching a predetermined upper limit number of times.
- the data reception wireless communication device Dv2 detects a flag indicating the final retransmission from the MAC frame transmitted from the data transmission wireless communication device Dv1, and further, for example, the retry bit of the MAC frame is set.
- the number changes from 1 to 0, or when the sequence number changes it is determined that the cause of the number of retransmissions of the MAC frame has reached a predetermined upper limit number.
- FIG. 9 is a flowchart for explaining an example of a procedure for setting the beam pattern of the transmission antenna ATX of the Ack frame for the data frame received by the data reception wireless communication device Dv2 according to the first modification of the first embodiment. Note that in FIG. 9, the same operations as those illustrated in FIG. 8A are denoted by the same reference numerals, and description thereof is omitted or simplified, and different contents are described.
- the SN determination unit 15B determines that the cause of the change in the sequence number of the MAC frame (for example, the data frame) received in step P1 is the number of retransmissions of the MAC frame based on the first to fourth cases described above. It is determined whether or not the predetermined number of times has been reached (S12).
- the transmission antenna control unit 16T It is determined whether or not the number of retransmissions of the frame has reached a predetermined upper limit. If it is determined that the upper limit has been reached (S12, YES), the beam pattern of the transmission antenna ATX used for the response of the Ack frame is changed. (P7).
- the wireless transmission unit 14 transmits the Ack frame generated by the response frame generation unit 13 to the communication partner using the beam pattern of the transmission antenna ATX after the change in Step P7 (P8).
- the transmission antenna control unit 16T determines that the cause of the change in the sequence number of the MAC frame (for example, the data frame) is not because the SN determination unit 15B has reached the predetermined number of retransmissions of the MAC frame. (P12, NO), the beam pattern of the transmitting antenna ATX used for the response of the Ack frame is held (P5).
- the wireless transmission unit 14 transmits the Ack frame generated by the response frame generation unit 13 to the communication partner (data transmission wireless communication device Dv1) using the beam pattern of the transmission antenna ATX held in Step P5 (P6).
- the data reception wireless communication device Dv2 transmits the MAC frame (for example, the data frame) to the communication partner (data transmission wireless communication device Dv1) using the beam pattern of the transmission antenna ATX held in Step P5 (P11). ).
- the wireless communication device 1 of the first modification can reduce the number of transmissions of the Ack frame by determining the cause of the change in the sequence number in the data reception wireless communication device Dv2, thereby reducing the number of transmissions of the Ack frame.
- the beam pattern of the transmitting antenna ATX suitable for transmitting Ack frames can be set in a short time.
- the retry bit of the MAC frame (for example, data frame) transmitted from the communication partner (data transmission wireless communication device Dv1) by the wireless communication device 1 (data reception wireless communication device Dv2) is 0.
- the beam pattern of the transmission antenna ATX used by the wireless communication device 1 (data reception wireless communication device Dv2) for transmitting the Ack frame is considered appropriate at the time of transmitting the Ack frame. It is done.
- the data reception wireless communication device Dv2 uses the same beam pattern as the beam pattern of the transmission antenna ATX at the time of transmitting the Ack frame, It is used as a beam pattern of the receiving antenna ARX (see FIG. 10).
- the wireless communication device for data transmission Dv1 and the wireless communication device for data reception Dv2 change the beam pattern of the reception antenna ARX to be omnidirectional (omni) or pseudo-omnidirectional (quasi-omni). Often set to beam pattern.
- the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 do not need to receive the MAC frame transmitted from the third station.
- the beam pattern of the receiving antenna ARX may not be set to a beam pattern that is omnidirectional (omni) or pseudo-omnidirectional (quasi-omni).
- the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 can specify the transmission source of the received MAC frame.
- the beam pattern need not be set to an omnidirectional or quasi-omni beam pattern.
- FIG. 10 is a diagram illustrating a transmission antenna beam pattern for transmitting an Ack frame corresponding to a data frame received by the data reception wireless communication device Dv2 in Modification 2 of the first embodiment, and reception for receiving the next data frame. It is a flowchart explaining an example of the setting procedure of the beam pattern of an antenna. Note that in FIG. 10, the same operations as those illustrated in FIG. 8A are denoted by the same reference numerals, and description thereof is omitted or simplified, and different contents are described.
- the reception antenna control unit 16R of the data reception wireless communication device Dv2 receives the beam of the reception antenna ARX to receive the MAC frame transmitted from the communication partner (data transmission wireless communication device Dv1).
- the same beam pattern as that of the transmitting antenna ATX is used (P14).
- the wireless communication device 1 data reception wireless communication device Dv2 of the second modification is not set to omnidirectional (omni) or pseudo-omnidirectional (quasi-omni) as the beam pattern of the reception antenna ARX.
- omni omnidirectional
- pseudo-omnidirectional pseudo-omnidirectional
- the wireless communication device 1 (data reception wireless communication device Dv2) of the second modification holds or changes the beam pattern of the transmission antenna ATX used for transmitting the Ack frame, and then sets the set period PH1 in the next transmission cycle TR. Then, for example, the setting of the beam pattern of the receiving antenna ARX can be omitted, and the same beam pattern as that of the transmitting antenna ATX can be set.
- the wireless communication device 1 of the second modification can suppress the use of a communication path (communication band) necessary for setting the beam pattern of the receiving antenna ARX in the set period PH1 in the next transmission cycle TR.
- Bandwidth can be used effectively and power consumption can be reduced.
- the data transmission wireless communication device Dv1 transmits the aggregation frame shown in FIG. 16A
- the data reception wireless communication device Dv2 transmits part or all of the MAC frames (MPDU) in the aggregation frame.
- MPDU MAC frames
- the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 of the present embodiment have the same configuration as the wireless communication device 1A shown in FIG. 3A or the wireless communication device 1B shown in FIG. Have
- FIG. 11 is a sequence diagram illustrating an example of signaling related to transmission of an aggregation data frame in the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 according to the second embodiment.
- the data transmission wireless communication device Dv1 transmits an aggregation frame including a plurality of MAC frames (MPDU) to the data reception wireless communication device Dv2 (S21).
- the beam of the transmission antenna ATX A block Ack frame is transmitted to the data transmission wireless communication device Dv1 using a pattern (for example, Pt2) (S21).
- Pt2 a pattern for example, Pt2
- the block Ack frame does not reach the data transmission wireless communication device Dv1 (S21).
- the data transmission wireless communication device Dv1 Since the data transmission wireless communication device Dv1 does not receive the block Ack frame corresponding to the aggregation frame transmitted in step S21, it retransmits the same aggregation frame as the aggregation frame transmitted in step S21 (S22).
- the data reception wireless communication device Dv2 correctly receives the aggregation frame with the same sequence number retransmitted from the data transmission wireless communication device Dv1, and further determines that a response of the block Ack frame is necessary.
- a beam pattern (for example, Pt2) is changed (S22). That is, when the data reception wireless communication device Dv2 determines that the initial transmission or retransmission of the aggregation frame including the MAC frame (MPDU) all having the same sequence number has occurred before, the beam pattern of the transmission antenna ATX is If it is not appropriate, the beam pattern of the transmitting antenna ATX used for the response of the block Ack frame is changed.
- the data reception wireless communication device Dv2 transmits the block Ack frame to the data transmission wireless communication device Dv1 using the beam pattern (for example, Pt1) of the changed transmission antenna ATX (S22).
- the block Ack frame transmitted in step S22 is appropriate for the communication environment between the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 and the beam pattern of each antenna.
- the data transmission wireless communication device Dv1 receives the data correctly.
- the data reception wireless communication device Dv2 does not initially transmit or retransmit an aggregation frame including a MAC frame (MPDU) all having the same sequence number, that is, some of the aggregation frames are new. If it is determined that the beam pattern of the transmission antenna ATX used for the response of the block Ack frame is not changed, the beam pattern is retained without being changed.
- MPDU MAC frame
- FIG. 12 is a flowchart illustrating an example of a setting procedure of a beam pattern of a transmission antenna for transmitting a block Ack frame corresponding to an aggregation data frame received by the data reception wireless communication device Dv2 according to the second embodiment. .
- the wireless reception unit 11 determines whether or not all MAC frames (MPDUs) out of the correctly received aggregation frames have been correctly received (P22).
- the response necessity determination unit 12 determines the frame type or response type of each MPDU of the aggregation frame demodulated by the wireless reception unit 11.
- P23 it is determined whether a response of the block Ack frame indicating reception of the aggregation frame is necessary (P23).
- the response necessity determination unit 12 outputs the determination result to the response frame generation unit 13, the SN determination unit 15B, and the transmission antenna control unit 16T.
- the transmission antenna control unit 16T holds the beam pattern of the transmission antenna ATX (P24).
- the response frame generation unit 13 When the response necessity determination unit 12 determines that the response of the block Ack frame is necessary (P23, YES), the response frame generation unit 13 generates a block Ack frame indicating reception of the aggregation frame and wirelessly transmits it. To the unit 14.
- the SN determination unit 15B determines whether the stored SN pattern and the received SN pattern are the same when the response necessity determination unit 12 determines that a response of the block Ack frame is required (P23, YES). Determine (P25). The SN determination unit 15B stores the received SN pattern regardless of the determination result of step P25 (P26, P29).
- a sequence number set (pattern) of MAC frames (MPDUs) correctly received among previously received aggregation frames stored in the SN determination unit 15B is expressed as “ The abbreviation “stored SN pattern” is used, and a set (pattern) of sequence numbers of MAC frames (MPDUs) correctly received among the aggregation frames received this time at the receiving antenna ARX is abbreviated as “received SN pattern”.
- the transmission antenna control unit 16T holds the beam pattern of the transmission antenna ATX used for the response of the block Ack frame because the SN determination unit 15B determines that the stored SN pattern and the received SN pattern do not match ( P27).
- the wireless communication device 1B has received an aggregation frame including a MAC frame (MPDU) to which a new sequence number is assigned. Therefore, it is considered that the beam pattern of the transmission antenna ATX used for the response of the previous block Ack frame is appropriate, and the beam pattern of the transmission antenna ATX does not need to be changed.
- MPDU MAC frame
- the wireless transmission unit 14 transmits the block Ack frame generated by the response frame generation unit 13 to the communication partner (data transmission wireless communication device Dv1) using the beam pattern of the transmission antenna ATX held in Step P27 ( P28).
- the transmission antenna control unit 16T determines that the stored SN pattern matches the received SN pattern because the SN determination unit 15B matches the beam pattern of the transmission antenna ATX used for the response of the block Ack frame. Change (P30).
- the wireless communication device 1B has retransmitted the aggregation including the MAC frame (MPDU) to which the same sequence number is assigned and has received the retransmitted aggregation frame. Become. Therefore, it is considered that the beam pattern of the transmission antenna ATX used for the response of the previous block Ack frame is inappropriate, and the beam pattern of the transmission antenna ATX needs to be changed.
- MPDU MAC frame
- the wireless transmission unit 14 transmits the block Ack frame generated by the response frame generation unit 13 to the communication partner (data transmission wireless communication device Dv1) using the beam pattern of the transmission antenna ATX after the change in Step P30 ( P31).
- the response necessity determination unit 12 determines the aggregation frame demodulated by the wireless reception unit 11, that is, Based on the frame type or response type of some correctly received MAC frames (MPDU), it is determined whether or not a response of a block Ack frame indicating reception of the aggregation frame is necessary (P32).
- the response necessity determination unit 12 outputs the determination result to the response frame generation unit 13, the SN determination unit 15B, and the transmission antenna control unit 16T.
- the transmission antenna control unit 16T holds the beam pattern of the transmission antenna ATX (P33).
- the response frame generation unit 13 When the response necessity determination unit 12 determines that the response of the block Ack frame is necessary (P32, YES), the response frame generation unit 13 generates a block Ack frame indicating reception of the aggregation frame and wirelessly transmits it. To the unit 14.
- the SN determination unit 15B when the response necessity determination unit 12 determines that the response of the block Ack frame is necessary (P32, YES), the stored SN pattern and some of the MAC frames (MPDU) correctly received It is determined whether or not the received SN pattern is the same (P34).
- the SN determination unit 15B stores the received SN pattern regardless of the determination result of step P25 (P35, P38).
- the transmission antenna control unit 16T determines that the stored SN pattern does not match the received SN pattern of some MAC frames (MPDUs) correctly received by the SN determination unit 15B, and therefore the response of the block Ack frame
- the beam pattern of the transmitting antenna ATX used for the above is held (P36).
- the wireless communication device 1B uses the aggregation frame including the MAC frame (MPDU) to which the new sequence number is assigned. It will be received. Therefore, it is considered that the beam pattern of the transmission antenna ATX used for the response of the previous block Ack frame is appropriate, and the beam pattern of the transmission antenna ATX does not need to be changed.
- the wireless transmission unit 14 transmits the block Ack frame generated by the response frame generation unit 13 to the communication partner using the beam pattern of the transmission antenna ATX held in Step P36 (P37).
- the transmission antenna control unit 16T has determined that the SN determination unit 15B matches the stored SN pattern and the received SN pattern of some MAC frames (MPDUs) correctly received, so that the block Ack
- the beam pattern of the transmitting antenna ATX used for the frame response is changed (P39).
- the wireless communication device 1B Since the stored SN pattern matches the received SN pattern of some correctly received MAC frames (MPDUs), the wireless communication device 1B performs aggregation including the MAC frame (MPDU) to which the same sequence number is assigned. The retransmitted aggregation frame has been received. Therefore, it is considered that the beam pattern of the transmission antenna ATX used for the response of the previous block Ack frame is inappropriate, and the beam pattern of the transmission antenna ATX needs to be changed.
- the wireless transmission unit 14 transmits the block Ack frame generated by the response frame generation unit 13 to the communication partner using the beam pattern of the transmission antenna ATX after the change in Step P39 (P40).
- step P28 The operation of the wireless communication device 1A after step P28, step P31, step P37, or step P40 returns to step P21.
- the wireless communication device 1 correctly receives a part or all of the MAC frames (MPDU) among the aggregation frames transmitted from the communication partner, and the response of the block Ack frame indicating the response of the aggregation frame is received. If it is determined that it is necessary, it is determined whether or not the same aggregation frame has been retransmitted from the communication partner by comparing the stored SN pattern with the received SN pattern.
- MPDU MAC frames
- the wireless communication device 1 If it is determined that the same aggregation frame has been retransmitted from the communication partner, the wireless communication device 1 assumes that the beam pattern of the transmission antenna ATX used for transmitting the previously transmitted block Ack frame is not appropriate, and that the transmission antenna ATX Change the beam pattern. The wireless communication device 1 transmits a block Ack frame using the changed beam pattern.
- the wireless communication device 1 does not change the beam pattern of the transmission antenna ATX used for transmission of the block Ack frame and retransmits the same aggregation frame unless the same aggregation frame is retransmitted from the communication partner. Since the beam pattern of the transmission antenna ATX is changed, unnecessary change of the beam pattern of the transmission antenna ATX can be avoided.
- the wireless communication apparatus 1 can avoid the unnecessary change in the beam pattern of the transmission antenna ATX, and can omit the preparation period for setting the setting period PH1 and the setting period PH1, and thus can quickly restore the communication path. Degradation of the communication environment (communication quality) with the communication partner can be suppressed. That is, since the wireless communication device 1 can reduce unnecessary occupation time (for example, the setting period PH1 and the preparation period for setting the setting period PH1) of the communication band, the effective throughput can be improved, and further, the power consumption and the communication partner can be improved. The time required to connect to can be reduced.
- not all the MAC frames (MPDUs) among the aggregation frames are received. For example, when three MAC frames are concatenated, a total of eight reception combinations are possible. . For this reason, in step P21 shown in FIG. 12, when the wireless communication device 1B receives a MAC frame that is equal to or greater than a predetermined threshold among the aggregation frames, the wireless communication device 1B determines that it has received an aggregation frame including a part of the MAC frames. Also good.
- the wireless communication device 1B when the wireless communication device 1B receives a MAC frame less than a predetermined threshold among the aggregation frames and receives no other frames, it is difficult to compare the stored SN pattern with the received SN pattern. It is determined that the aggregation frame has not been received. As a result, the wireless communication device 1B can process the comparison between the stored SN pattern and the received SN pattern with high accuracy after correctly receiving the aggregation frame, avoid erroneous determination of retransmission of the aggregation frame, and increase the antenna beam pattern. Can be set to accuracy.
- the wireless communication device 1 transmits an Ack frame or a block Ack frame using the same frequency as the frequency used by the communication partner for transmitting the MAC frame (for example, a data frame). You may transmit an Ack frame or a block Ack frame using the frequency different from the frequency which the other party used for transmission of a MAC frame (for example, data frame).
- the communication partner of the wireless communication device 1 transmits a data frame using directional band (for example, millimeter wave), but transmits a data frame using un-directional band (for example, microwave). You may send it.
- directional band for example, millimeter wave
- un-directional band for example, microwave
- the wireless communication for data transmission is performed according to the retry bit, the sequence number, and the sequence number pattern.
- the state of the communication path between the device Dv1 and the data reception wireless communication device Dv2 can be accurately determined. For example, in a communication environment in which the beam pattern of the transmission antenna ATX or the reception antenna ARX is held, it is considered that the communication quality between the data transmission wireless communication device Dv1 and the data reception wireless communication device Dv2 is high.
- the wireless communication device 1 reduces, for example, transmission power (see FIG. 13), reduces the gain of the reception antenna ARX, and performs MCS (Modulation and Coding Scheme) or code. It is also possible to increase the conversion rate, increase the frame length of the MAC frame, or increase the number of connected MAC frames in the aggregation frame. As a result, the wireless communication device 1 can effectively use the wireless band, and the power consumption of the wireless communication device 1 can be reduced.
- transmission power see FIG. 13
- MCS Modulation and Coding Scheme
- the wireless communication device 1 increases, for example, transmission power (see FIG. 13), increases the gain of the reception antenna ARX, and decreases MCS (Modulation and Coding scheme). Then, the frame length of the MAC frame may be reduced, the number of MAC frames connected in the aggregation frame may be reduced, or the used carrier frequency may be changed to another carrier frequency.
- transmission power see FIG. 13
- MCS Modulation and Coding scheme
- the wireless communication device 1 estimates a frequency band with high communication quality by scanning the frequency band according to the deterioration of communication quality. Thereby, since the wireless communication device 1 can avoid retransmission of unnecessary MAC frames or aggregation frames, the wireless communication device 1 can effectively use the wireless band, and the power consumption of the wireless communication device 1 can be reduced.
- FIG. 13 illustrates an example of a procedure for setting the beam pattern of the transmission antenna ATX for transmitting the Ack frame corresponding to the MAC frame received by the data reception wireless communication device Dv2 according to the third modification of the first embodiment. It is a flowchart. Note that in FIG. 13, the same operations as those illustrated in FIG. 4A are denoted by the same reference numerals, and description thereof is omitted or simplified, and different contents are described.
- the wireless transmission unit 14 reduces the transmission power of the Ack frame generated by the response frame generation unit 13 (P15), and uses the beam pattern of the transmission antenna ATX held in Step P5. To the communication partner (P6).
- the wireless transmission unit 14 increases the transmission power of the Ack frame generated by the response frame generation unit 13 (P16), and performs communication using the beam pattern of the transmission antenna ATX after the change in step P7. Transmit to the other party (P8).
- MAC frame transmission and Ack frame response transmission are described as examples.
- a combination of transmission and response transmission is, for example, RTS ( Request To Send), CTS (Clear To Send), SSW (Sector Sweep), SSW-FB (Sector Sweep-Feedback) and SSW-Ack (Sector Sweep-Ack), Association Request / Ack, Association Response / Ack
- RTS Request To Send
- CTS Clear To Send
- SSW ctor Sweep
- SSW-FB Vector Sweep-Feedback
- SSW-Ack Sector Sweep-Ack
- FIG. 19A illustrates a setting procedure of a beam pattern of a transmission antenna of a response frame (for example, a CTS frame) to a MAC frame (for example, an RTS frame) received by the data reception wireless communication device according to the fourth modification of the first embodiment.
- FIG. 19B is a flowchart illustrating an example of the change of the frame type by the reception of the CTS frame in the data transmission wireless communication device and the data reception wireless communication device according to the fourth modification of the first embodiment. It is a sequence diagram which shows an example of the signaling performed.
- FIG. 19 is a flowchart and a sequence diagram when data and Ack in FIGS. 4A and 5A are replaced with frames.
- P2 of FIG. 4 (A) whether or not the response transmission of the Ack frame is required is confirmed, but in FIG. 19 (A), whether or not the response transmission of the frame is necessary is confirmed.
- P4 of FIG. 4A the retry bit of the data frame is confirmed.
- FIG. 19A it is confirmed whether the previous received frame type is different from the current received frame type. That is, YES in P4R is a determination in S4R in FIG. 19B described later, and NO in P4R is a determination in S2R in FIG. 19B.
- P6R is a response transmission of the S4R Ack frame in FIG. 19
- P8R is a response transmission of the S2R CTS frame in FIG.
- FIG. 19B is a sequence diagram for the transmission and reception of data and Ack after the transmission and reception of RTS and CTS. Since the RTS does not include the sequence number and the retry bit, the data reception wireless communication device Dv2 does not determine the retransmission of the RTS, but receives the second RTS, so the beam pattern is used in the second CTS transmission. Is changed (S2R). That is, since it corresponds to NO of P4R in FIG. 19A, the beam pattern is changed.
- the wireless communication device Dv1 for data transmission changes the transmission frame type from RTS to data by receiving the CTS, and transmits data including sequence number and retry bit information (S3R).
- the data receiving wireless communication device Dv2 since the data receiving wireless communication device Dv2 receives the data after transmitting the CTS, it determines that the CTS has been received by the data transmitting wireless communication device Dv1, and returns Ack without changing the beam pattern. (S4R). That is, since this corresponds to YES in P4R in FIG. 19A, the beam pattern is not changed.
- response transmission is not limited to transmitting an Ack frame, and a Reverse-Direction system that includes a data frame and an Ack frame may be used.
- the data reception wireless communication device Dv2 when changing the beam pattern of the transmission antenna ATX, includes a beam pattern and a beam adjacent to the current beam pattern from among a plurality of switchable beam patterns. You may set to either the beam pattern according to the identification number provided for every pattern, or the beam pattern selected at random.
- the data reception wireless communication device Dv2 changes the beam pattern of the transmission antenna ATX when a MAC frame or an aggregation frame is continuously received a plurality of times exceeding a predetermined threshold. You may do it. Thereby, the data reception wireless communication device Dv2 can avoid an unnecessary change in the beam pattern of the transmission antenna ATX due to non-arrival of the Ack frame or the block Ack frame due to, for example, an instantaneous change in the communication environment.
- the present disclosure is useful as a wireless communication apparatus that avoids unnecessary changes in the beam pattern of the antenna and suppresses deterioration in communication quality.
- Wireless communication device 1, 1A, 1B Wireless communication device 11 Wireless reception unit 12 Response necessity determination unit 13 Response frame generation unit 14 Radio transmission unit 15 Antenna control unit 15R Reception antenna control unit 15T Transmission antenna control unit 16 Determination unit 16A Retransmission bit determination unit 16B SN determination unit ARX reception antenna ATX transmission antenna Dv1 data transmission radio communication device Dv2 data reception radio communication device
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Abstract
Description
先ず、本開示に係る無線通信装置の各実施形態を説明する前に、各実施形態の内容に至る経緯として、上述した特許文献1及び特許文献1における課題について説明する。なお、データ送信用無線通信装置は、無線送信部及び無線受信部を含む構成であり、データ受信用無線通信装置は、無線送信部及び無線受信部を含む構成である。また、データ送信用無線通信装置とデータ受信用無線通信装置とは、同様の構成を有し、例えば直接通信する場合を想定して説明する。
先ず、各実施形態の無線通信装置の送信アンテナ又は受信アンテナのビームパターンの形成について、図1(A)~図1(D)を参照して説明する。
第1の実施形態では、例えばデータ送信用無線通信装置Dv1が図14(A)に示すMACフレームを送信し、データ受信用無線通信装置Dv2がMACフレームを受信したことを示すAckフレームを応答する場合を想定して説明する。
第1の実施形態では、データ受信用無線通信装置Dv2において、例えばMACフレームのリトライビットが1から0に変化したこと、或いはシーケンス番号が変化したことの原因が、データ送信用無線通信装置Dv1がAckフレームを正しく受信したこと、又はデータ送信用無線通信装置Dv1が再送したMACフレームの再送回数が所定の再送回数が上限に到達したことのいずれであるかが区別されていない。
第1の実施形態において、無線通信装置1(データ受信用無線通信装置Dv2)が通信相手(データ送信用無線通信装置Dv1)から送信されたMACフレーム(例えばデータフレーム)のリトライビットが0である場合、又はシーケンス番号が変化した場合、無線通信装置1(データ受信用無線通信装置Dv2)がAckフレームの送信に用いた送信アンテナATXのビームパターンは、Ackフレームの送信時では適切であったと考えられる。
第2の実施形態では、例えばデータ送信用無線通信装置Dv1が図16(A)に示すアグリゲーションフレームを送信し、データ受信用無線通信装置Dv2がアグリゲーションフレームのうち一部又は全てのMACフレーム(MPDU)を受信したことを示すブロックAckフレームを応答する場合について説明する。なお、本実施形態のデータ送信用無線通信装置Dv1及びデータ受信用無線通信装置Dv2は、図3(A)に示す無線通信装置1A又は図3(B)に示す無線通信装置1Bと同様の構成を有する。
なお、第1又は第2の実施形態では、データ受信用無線通信装置Dv2が正しく受信したMACフレーム又はアグリゲーションフレームにおいて、リトライビットと、シーケンス番号と、シーケンス番号のパターンとによって、データ送信用無線通信装置Dv1とデータ受信用無線通信装置Dv2との間の通信路の状況が的確に判別できる。例えば送信アンテナATX又は受信アンテナARXのビームパターンが保持される通信環境では、データ送信用無線通信装置Dv1とデータ受信用無線通信装置Dv2との間の通信品質が高いと考えられる。
なお、上述した各実施形態では、MACフレームの送信及びAckフレームの応答送信、アグリゲーションフレームの送信及びブロックAckフレームの応答送信を例示して説明したが、送信及び応答送信の組み合わせは、例えばRTS(Request To Send)の送信及びCTS(Clear To Send)、SSW(Sector Sweep)、SSW-FB(Sector Sweep-Feedback)及びSSW-Ack(Sector Sweep-Ack)、Association Request/Ack、Association Response/Ackの各組み合わせでも良い。
11 無線受信部
12 応答要否判定部
13 応答フレーム生成部
14 無線送信部
15 アンテナ制御部
15R 受信アンテナ制御部
15T 送信アンテナ制御部
16 判定部
16A 再送ビット判定部
16B SN判定部
ARX 受信アンテナ
ATX 送信アンテナ
Dv1 データ送信用無線通信装置
Dv2 データ受信用無線通信装置
Claims (7)
- 通信相手から送信された第1送信フレームを受信アンテナにおいて受信する受信部と、
前記受信アンテナにおいて受信された前記第1送信フレームを基に、前記第1送信フレームの受信を示す第1応答フレームを生成する応答フレーム生成部と、
生成された前記第1応答フレームを送信アンテナから送信する送信部と、
前記通信相手から同一の前記第1送信フレームが再送されたか否かを判定する判定部と、
前記通信相手から同一の前記第1送信フレームが再送された場合に、前記送信アンテナのビームパターンを変更するアンテナ制御部と、を備える、
無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記第1送信フレームは、前記第1送信フレームの再送の有無を示す再送ビット情報を含み、
前記判定部は、受信された前記第1送信フレームの前記再送ビット情報が前記第1送信フレームの再送を示す場合に、
前記通信相手から同一の前記第1送信フレームが再送されたと判定する、
無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記第1送信フレームは、前記第1送信フレームの識別情報を示す識別番号情報を含み、
前記判定部は、受信された前記第1送信フレームの前記識別番号情報が同一である場合に、前記通信相手から同一の前記第1送信フレームが再送されたと判定する、
無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記アンテナ制御部は、前記第1送信フレームの受信を示す前記第1応答フレームの送信後に、前記通信相手から異なる第2送信フレームが送信された場合に、前記送信アンテナのビームパターンを保持し、
前記送信部は、保持された前記送信アンテナのビームパターンを用いて、新たな送信フレームを前記通信相手に送信する、
無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記判定部は、前記第1送信フレームの受信を示す前記第1応答フレームの送信後に、前記通信相手から異なる第2送信フレームが送信された場合に、前記第1送信フレームの再送回数が所定の上限回数に達したか否かを判定し、
前記アンテナ制御部は、前記第1送信フレームの再送回数が前記所定の上限回数に達したと判定された場合に、前記第2送信フレームの受信を示す第2応答フレームの送信に用いる前記送信アンテナのビームパターンを変更する、
無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記アンテナ制御部は、前記第1送信フレームの受信を示す前記第1応答フレームの送信後に、前記通信相手から異なる第2送信フレームが送信された場合に、前記送信アンテナのビームパターンを保持し、保持された前記送信アンテナのビームパターンと同じビームパターンを前記受信アンテナに設定する、
無線通信装置。 - 請求項1に記載の無線通信装置であって、
前記通信相手から送信された第1送信フレームは、異なる識別番号情報を有する複数のデータフレームを含み、
前記送信部は、前記通信相手から送信された第1送信フレームのうち、前記受信アンテナにおいて受信された一部又は全ての識別番号情報を有する各データフレームの受信を示す応答フレームを、前記第1応答フレームとして前記通信相手に送信する、
無線通信装置。
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