WO2016111085A1 - 無線通信装置、無線通信方法及びプログラム - Google Patents
無線通信装置、無線通信方法及びプログラム Download PDFInfo
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- WO2016111085A1 WO2016111085A1 PCT/JP2015/081535 JP2015081535W WO2016111085A1 WO 2016111085 A1 WO2016111085 A1 WO 2016111085A1 JP 2015081535 W JP2015081535 W JP 2015081535W WO 2016111085 A1 WO2016111085 A1 WO 2016111085A1
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- wireless communication
- communication device
- message
- delivery confirmation
- control unit
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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
- H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1863—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
- H04L12/1868—Measures taken after transmission, e.g. acknowledgments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0096—Indication of changes in allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0093—Point-to-multipoint
Definitions
- the present disclosure relates to a wireless communication device, a wireless communication method, and a program.
- the wireless LAN system may employ retransmission control using an acknowledgment (ACK: ACKnowledgement) and a negative acknowledgment (NACK: Negative ACKnowledgement).
- ACK acknowledgment
- NACK Negative ACKnowledgement
- a delivery confirmation response including information indicating success or failure of data reception may be returned from the reception side in response to a delivery confirmation request from the data transmission side.
- BAR Block ACK Request
- BA Block ACK
- IEEE 802.11aa which is one of the standards related to wireless LAN
- retransmission control using BAR and BA is performed between a parent device (AP: Access Point) and a child device (STA: Station).
- the technology is defined.
- a technique is defined in which the AP performs retransmission control related to multicast transmission by unicasting a BAR to a plurality of STAs belonging to a multicast group and receiving the BA from the STA.
- an AP can transmit a BAR to all STAs and receive BAs from all STAs, thereby realizing a highly reliable wireless communication environment. is there.
- the throughput may deteriorate due to the overhead associated with transmission / reception of BAR and BA.
- Patent Document 1 discloses a technique for grouping STAs of a multicast group and transmitting / receiving BAR and BA only for a representative terminal set for each group.
- the present disclosure proposes a new and improved wireless communication device, wireless communication method, and program capable of changing the transmission destination of the delivery confirmation request more flexibly.
- a wireless communication unit that performs wireless communication with another wireless communication device, and a first request for changing a transmission destination of a transmission confirmation request frame related to multicast transmission by the other wireless communication device
- a wireless communication device comprising: a control unit that controls the wireless communication unit to transmit a message to the other wireless communication device.
- a wireless communication unit that performs wireless communication with another wireless communication device, and a change in transmission destination of a transmission confirmation request frame received from the other wireless communication device by the wireless communication unit And a control unit that selects a transmission destination of the transmission confirmation request frame related to multicast transmission by the wireless communication unit based on a first message requesting the transmission.
- a request for changing a transmission destination of a transmission confirmation request frame related to multicast transmission by the other wireless communication apparatus is made.
- a wireless communication method including transmitting one message to the other wireless communication device is provided.
- the transmission destination of the transmission confirmation request frame received from the other wireless communication device by the wireless communication device is changed.
- the wireless communication method includes: selecting a transmission destination of the transmission confirmation request frame related to multicast transmission by the wireless communication device based on a first message requesting the transmission.
- the computer is configured to change a transmission destination of a transmission confirmation request frame related to multicast transmission by the other wireless communication device and a wireless communication unit that performs wireless communication with the other wireless communication device.
- a program for causing the wireless communication unit to function as a control unit that controls the wireless communication unit to transmit the first message to be requested to the other wireless communication device is provided.
- the computer transmits a wireless communication unit that performs wireless communication with another wireless communication device, and a transmission confirmation request frame received from the other wireless communication device by the wireless communication unit.
- a program for functioning as a control unit that selects a transmission destination of the transmission confirmation request frame related to multicast transmission by the wireless communication unit based on a first message requesting a change in destination is provided.
- the transmission destination of the delivery confirmation request can be changed more flexibly.
- the above effects are not necessarily limited, and any of the effects shown in the present specification, or other effects that can be grasped from the present specification, together with or in place of the above effects. May be played.
- FIG. 1 is a diagram illustrating an example of an overall configuration of a wireless communication system according to an embodiment of the present disclosure. It is a block diagram which shows an example of the logical structure of AP which concerns on this embodiment. It is a block diagram which shows an example of the logical structure of STA which concerns on this embodiment. It is a sequence diagram which shows an example of the flow of the transmission / reception process of BAR and BA performed in the radio
- elements having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numerals.
- a plurality of elements having substantially the same functional configuration are distinguished as necessary, such as the wireless communication devices 100A, 100B, and 100C.
- the wireless communication devices 100A, 100B, and 100C are simply referred to as the wireless communication device 100.
- FIG. 1 is a diagram illustrating an example of an overall configuration of a wireless communication system 1 according to an embodiment of the present disclosure.
- the wireless communication system 1 includes a wireless communication device 100 and one or more wireless communication devices 200.
- the wireless communication device 100 is an AP that provides a wireless communication service to one or more STAs connected to the wireless communication device 100.
- the wireless communication device 200 is a STA that performs wireless communication by connecting to the AP 100.
- the STAs 200A and 200B are smartphones, and the STA 200C is a tablet terminal.
- Communication from the AP 100 to the STA 200 is also referred to as DL (downlink), and communication from the STA 200 to the AP 100 is also referred to as UL (uplink).
- the AP 100 and the STAs 200A to 200C are connected via wireless communication, and directly transmit / receive frames.
- the STAs 200A to 200C belong to a single multicast group, and the AP 100 performs multicast transmission for the STAs 200A to 200C.
- the AP 100 has completed preparations for transmitting / receiving BAR and BA by transmitting / receiving ADDBA requests and ADDBA responses to / from the STAs 200A to 200C.
- any of the STAs 200A to 200C can receive the BAR and return the BA.
- the STA 200 belongs to a single multicast group, and preparation for transmitting / receiving BAR and BA is completed.
- FIG. 2 is a block diagram illustrating an example of a logical configuration of the AP 100 according to the present embodiment.
- the AP 100 includes a wireless communication unit 110, a storage unit 120, and a control unit 130.
- the wireless communication unit 110 is a wireless communication interface that mediates wireless communication with other devices by the AP 100.
- the wireless communication unit 110 performs wireless communication with the STA 200.
- the wireless communication unit 110 receives a wireless signal transmitted from the STA 200.
- the wireless communication unit 110 may have functions as an amplifier, a frequency converter, a demodulator, and the like, and can output received data to the control unit 130, for example.
- the wireless communication unit 110 transmits a wireless signal to the STA 200 via the antenna.
- the wireless communication unit 110 may have a function as a modulator, an amplifier, and the like.
- the data output from the control unit 130 may be transmitted after being modulated and amplified.
- the wireless communication unit 110 performs multicast transmission to the STA 200.
- the wireless communication unit 110 transmits a BAR to the STA that is the transmission destination of the BAR selected by the control unit 130, and receives the BA.
- the BA includes a BA bitmap (delivery confirmation response bitmap) indicating success / failure of a series of multicast packets.
- the multicast packet here refers to a multicast packet addressed to the multicast group to which the STA 200 itself belongs.
- the wireless communication unit 110 transmits and receives various messages for flexibly changing the BAR transmission destination to each STA 200.
- the storage unit 120 is a part that records and reproduces data on a predetermined recording medium.
- the storage unit 120 stores information indicating the transmission destination of the BAR selected by the control unit 130.
- Control unit 130 functions as an arithmetic processing unit and a control unit, and controls the overall operation within the AP 100 according to various programs.
- the control unit 130 has a function of selecting a BAR transmission destination.
- the control unit 130 may select the transmission destination of the BAR based on information regarding the reception status related to multicast transmission from the AP 100 in one or more STAs 200 belonging to the multicast group.
- this information is also referred to as reception status information.
- the reception status information is, for example, at least one of throughput, packet loss rate, number of multicast packets that have been successfully received, number of multicast packets that have failed to be received, or ratio of the sum of noise power and interference signal power to desired signal power It is information including.
- the AP 100 can improve the reliability of the entire wireless communication system 1 by selecting the transmission destination of the BAR based on the reception status information.
- the control unit 130 may determine at least one of a modulation scheme used for data transmission and an error correction coding rate based on the reception status information.
- the control unit 130 may control the wireless communication unit 110 to transmit a message requesting the reception status information to the STA 200.
- this message is also referred to as a reception status information request message.
- the control unit 130 acquires reception status information from a message including a reply from the STA 200 received by the wireless communication unit 110.
- this message is also referred to as a reception status information reply message.
- the control unit 130 selects the transmission destination of the BAR. For example, the control unit 130, based on a message (first message) requesting a change of the BAR transmission destination received from the STA 200 by the wireless communication unit 110, the BAR transmission destination related to multicast transmission by the wireless communication unit 110 May be selected.
- this message is also referred to as a destination change request message.
- the control unit 130 can flexibly change the transmission destination of the BAR according to a change in the radio wave environment of the STA 200 or the like. Thereby, the AP 100 can improve the reliability of the entire multicast group.
- control unit 130 may adopt the change request indicated by the received transmission destination change request message as it is, or may select the change request based on information indicating the reception status in the STA 200, for example. In addition, for example, the control unit 130 may periodically select a BAR transmission destination.
- control unit 130 may control the wireless communication unit 110 to transmit a message (second message) including information indicating the selection result of the BAR transmission destination to the STA 200 that is the transmission source of the transmission destination change request message.
- second message the message including information indicating the selection result of the transmission destination of the BAR is also referred to as a transmission destination change reply message. This message allows the STA 200 to know that it has been selected as a BAR transmission destination, that it has been excluded from the BAR transmission destination, or that its own request has been rejected.
- control unit 130 may control the wireless communication unit 110 to transmit a message (third message) including information used for a trigger (condition) for transmitting a transmission destination change request message in the STA 200.
- this message is also referred to as a transmission destination change request trigger setting message.
- the AP 100 can control the situation, timing, etc., of the transmission destination change request message transmitted by the STA 200.
- control unit 130 may control the wireless communication unit 110 to transmit a message notifying that the BAR is transmitted to the STA 200 selected as the BAR transmission destination.
- control unit 130 may control the wireless communication unit 110 to transmit a message notifying that the BAR is not transmitted to the STA 200 that has not been selected as the BAR transmission destination.
- a message is also referred to as a BAR transmission destination notification message.
- This message allows the STA 200 to explicitly know that it has been selected or not selected as a BAR transmission destination, and therefore transmits a transmission destination change request message according to its own reception status and the like. Is possible.
- the STA 200 determines whether or not the STA 200 is selected as the BAR transmission destination based on whether or not the BAR is transmitted to the STA 200 within a predetermined period. obtain.
- FIG. 3 is a block diagram illustrating an example of a logical configuration of the STA 200 according to the present embodiment.
- the STA 200 includes a wireless communication unit 210, a storage unit 220, and a control unit 230.
- the wireless communication unit 210 is a wireless communication interface that mediates wireless communication with other devices by the STA 200.
- the wireless communication unit 210 performs wireless communication with the AP 100.
- the wireless communication unit 210 receives a wireless signal transmitted from the AP 100.
- the wireless communication unit 210 may have functions as an amplifier, a frequency converter, a demodulator, and the like, and can output received data to the control unit 230, for example.
- the wireless communication unit 210 transmits a wireless signal to the AP 100 via the antenna.
- the wireless communication unit 210 may have a function as a modulator, an amplifier, and the like. For example, data output from the control unit 230 may be transmitted after being modulated and amplified.
- the wireless communication unit 210 receives a frame multicast-transmitted from the AP 100.
- the wireless communication unit 210 receives a BAR from the AP 100 and transmits a BA to the AP 100.
- the wireless communication unit 210 transmits / receives various messages for flexibly changing the BAR transmission destination to / from the AP 100.
- the storage unit 220 is a part that records and reproduces data on a predetermined recording medium.
- the storage unit 220 stores information included in a transmission destination change request trigger setting message notified by the AP 100.
- Control unit 230 functions as an arithmetic processing unit and a control unit, and controls the overall operation within the STA 200 according to various programs.
- control unit 230 has a function of controlling the wireless communication unit 210 so as to transmit a message (transmission destination change request message) requesting change of the transmission destination of the BAR related to multicast transmission by the AP 100 to the AP 100.
- the STA 200 can flexibly change the transmission destination of the BAR by a transmission destination change request message.
- the transmission destination change request message may be a message requesting to include the STA 200 itself in the transmission destination of the BAR. That is, this message is a message in which the STA 200 requests the start of transmission of the BAR to itself. Hereinafter, this message is also referred to as a BAR start request message.
- the STA 200 can request the AP 100 to set itself as the BAR transmission destination, for example, when the reception status is worse than the threshold.
- the STA 200 can receive an appropriate retransmission.
- the reception status or reception status information
- the threshold for example, when the reception status information is the throughput, it means that a value smaller than the threshold is calculated.
- the reception status information is the packet loss rate. If it is, it means that a value larger than the threshold is calculated.
- the reception condition being better than the threshold value means the opposite of these.
- This threshold value is specified by the transmission destination change request trigger setting message notified from the AP 100.
- the transmission destination change request message may be a message requesting to exclude the STA 200 itself from the BAR transmission destination. That is, this message is a message for requesting the STA 200 to stop transmission of the BAR to itself. Hereinafter, this message is also referred to as a BAR stop request message. With this message, the STA 200 can request the AP 100 to exclude itself from the BAR transmission destination, for example, when the reception status is better than the threshold. If this request is granted and excluded from the BAR destination, other STAs 200 in the multicast group can increase the chances of being selected as the BAR destination.
- control unit 230 may control the wireless communication unit 210 to transmit a reception status information answer message to the AP 100.
- the control unit 230 acquires the reception status information requested by the AP 100 specified by the reception status information request message notified from the AP 100, and returns a reception status information reply message.
- the control unit 130 acquires the reception status information of the STA 200 by transmitting a reception status information request message to the STA 200.
- the control unit 130 may control the wireless communication unit 110 to multicast the reception status information request message.
- the AP 100 can acquire the reception status information of each STA 200 belonging to the multicast group.
- Various information can be included in the reception status information request message.
- control unit 130 may include an identifier for identifying the requested reception status information in the reception status information request message.
- reception status information reply message includes the reception status information corresponding to the identifier.
- the control unit 130 when requesting the packet loss rate, can include the total number of multicast packets to be transmitted in the reception status information request message. As a result, the STA 200 can calculate the packet loss rate. Note that the STA 200 may calculate the total number of multicast packets transmitted by the AP 100 from the minimum sequence number and the maximum sequence number of the packets received by the STA 200. In this case, the control unit 130 may not include the total number of multicast packets to be transmitted in the reception status information request message.
- the control unit 130 when requesting the number of multicast packets that failed to be received, can include the total number of multicast packets to be transmitted in the reception status information request message. As a result, the STA 200 can calculate the number of multicast packets that failed to be received. Note that the STA 200 may calculate the number of multicast packets that failed to be received from the sequence numbers that have not been received between the minimum sequence number and the maximum sequence number of packets that have been successfully received. In this case, the control unit 130 may not include the total number of multicast packets to be transmitted in the reception status information request message. However, in IEEE 802.11, the sequence number of a multicast packet may be common to all multicast groups and management frames including beacons.
- a packet with a sequence number not received is not necessarily a packet addressed to the STA 200 itself.
- the STA 200 may simply count a packet with a sequence number that has not been received as the number of multicast packets that have failed to be received. For example, depending on the type of frame or whether or not the frame is addressed to itself You may count after filtering.
- control unit 130 may include information indicating a threshold for determining whether or not the STA 200 returns a reception status information reply message in the reception status information request message.
- the control unit 130 may use, for example, a raw value of the reception status information, or a value uniquely derived from a quantized value, an instantaneous value, an average value, or other raw values as a threshold value.
- the control unit 130 may use the rate of change from the past reception status information as a threshold.
- control unit 130 may include a plurality of threshold values related to one piece of reception status information, such as an upper limit value and a lower limit value, in the reception status information request message. In that case, the control unit 130 can cause the STA 200 whose reception status information is within the range between the upper limit value and the lower limit value to transmit the reception status information reply message.
- the threshold value designated by the control unit 130 may be a predetermined default value, or may be a value calculated by the control unit 130 based on the degree of congestion of the propagation path. It is desirable that this threshold value be the same as the threshold value used for selection of the BAR transmission destination in the AP 100 from the viewpoint of efficiency. Note that if the threshold value for the reception status information request message is not included, the STA 200 may send back a reception status information response message using the reception of the reception status information request message as a trigger.
- the reception status information request message may include a measurement start time and a measurement period. In that case, the accuracy of information collected from each of the STAs 200 can be kept constant.
- the reception status information request message can be transmitted using, for example, a radio measurement request frame.
- the control unit 130 can store information to be notified to the STA 200 such as an identifier for identifying the requested reception status information in an arbitrary field in the Radio Measurement Request frame.
- the control unit 130 may store the information in the following information element, or may store the information in one of the following information elements. ⁇ Channel load request ⁇ Noise histogram request ⁇ Frame request ⁇ STA statistics request ⁇ LCI request ⁇ Transmit stream / category measurement request ⁇ Multicast diagnostics requests ⁇ New Information Element
- the control unit 130 may select a STA 200 whose reception status information is within a threshold range as a BAR transmission destination.
- a plurality of values relating to one piece of reception status information may be set as the threshold value, such as an upper limit value and a lower limit value.
- the upper limit value may be a value determined to select, for example, a STA 200 having a poor reception status as a BAR transmission destination.
- the control unit 130 selects, as the BAR transmission destination, the STA 200 that has reported reception status information equal to or lower than the upper limit value. Thereby, the AP 100 can improve the reliability of the entire multicast group.
- the lower limit value may be a value determined so as not to select, for example, the STA 200 having extremely poor reception status as the BAR transmission destination.
- the control unit 130 does not select the STA 200 that has reported the reception status information equal to or lower than the lower limit value as the BAR transmission destination. In that case, the control unit 130 can avoid selecting the STA 200 with extremely bad reception status as the BAR transmission destination. Thereby, AP100 can suppress the overhead by excessive resending.
- the control unit 130 may use a threshold set by default in the wireless communication system 1 or may adaptively calculate the threshold based on the degree of congestion of the propagation path.
- the control unit 130 may set the maximum number of BAR transmission destinations.
- the control unit 130 selects the STA 200 as the BAR transmission destination within a range not exceeding the set maximum number.
- the AP 100 can suppress excessive transmission and reception of BAR and BA.
- the control unit 130 may set the maximum number based on the degree of congestion of the propagation path with the STA 200. Thereby, AP100 can avoid that the throughput of the whole radio
- the control unit 130 may use a preset maximum number.
- control unit 130 may sequentially select the transmission destination of the BAR every time the reception status information reply message is received from the STA 200. In this case, the AP 100 can improve the reliability from the stage where the reception status information from all the STAs 200 is not collected. Furthermore, it is possible to avoid a situation in which the reception status information reply message is transmitted from the STA 200 all at once and the band is compressed all at once. Further, the control unit 130 may select a transmission destination of the BAR when reception status information reply messages are received from a predetermined number of STAs 200. In this case, since the AP 100 can prevent the STA 200 having good reception status from being selected as the BAR transmission destination, the AP 100 can prevent redundant BAR and BA transmission / reception.
- the control unit 130 may control the power for transmitting the multicast packet according to the information on the reception status. For example, when the reception status of the STA 200 as the BAR transmission destination is good, the STA 200 can correctly receive the STA 200 even if the AP 100 reduces the power for transmitting the multicast packet. In such a case, the control unit 130 can reduce the influence on other wireless terminals existing around the AP 100 itself while maintaining the throughput by lowering the transmission power, thereby reducing the throughput of the entire system. Can be improved. Conversely, when the reception status of the STA 200 as the BAR transmission destination is poor, the control unit 130 increases the transmission power, thereby increasing the probability that the STA 200 as the BAR transmission destination can be received correctly and improving the throughput.
- the control unit 230 reports the reception status information requested from the AP 100 by transmitting a reception status information reply message to the AP 100.
- the control unit 230 may control the wireless communication unit 110 to unicast the reception status information request message.
- Various information can be included in the reception status information reply message.
- the reception status information reply message may include reception status information.
- the reception status information may be a measured raw value or a value uniquely derived from a quantized value, an instantaneous value, an average value, or other raw values.
- the reception status information reply message may include information indicating the degree of congestion of the propagation path measured by the STA 200.
- the AP 100 can set the maximum number of BAR transmission destinations based on the degree of congestion of the propagation path.
- the reception status information reply message may be transmitted using, for example, a radio measurement report frame.
- the control unit 230 can store information to be returned to the AP 100 such as reception status information in an arbitrary field in the Radio Measurement Report frame.
- the control unit 230 may store the information in the following information element, or may store the information in any of the following information elements.
- ⁇ Channel load report ⁇ Noise histogram report ⁇ Frame report ⁇ STA statistics report ⁇ LCI report ⁇ Transmit stream / category measurement report ⁇ Multicast diagnostics report ⁇ New Information Element
- FIG. 4 is a sequence diagram illustrating an example of a flow of BAR and BA transmission / reception processing executed in the wireless communication system 1 according to the present embodiment. As shown in FIG. 4, the AP 100 and the STA 200 are involved in this sequence. In FIG. 4, one STA 200 selected as a BAR transmission destination is shown as a representative, and other STAs 200 are omitted.
- step S102 the AP 100 transmits a reception status information request message to the STA 200.
- step S104 the STA 200 performs an answer determination process.
- the STA 200 calculates the reception status information requested in the reception status information request message and determines whether or not to reply. Detailed determination criteria will be described later with reference to FIG.
- step S106 the STA 200 transmits a reception status information reply message to the AP 100.
- step S108 the AP 100 performs a BAR transmission destination selection process. For example, the AP 100 determines to which STA 200 the BAR is to be transmitted based on information included in the reception status information reply message. Detailed criteria will be described later with reference to FIG.
- step S110 the AP 100 transmits a BAR transmission destination notification message for notifying that the BAR is transmitted to the STA 200 selected in step S108.
- step S112 the AP 100 performs multicast transmission to one or more STAs 200 belonging to the multicast group.
- the AP 100 may perform multicast transmission a plurality of times.
- step S114 the AP 100 transmits the BAR to the STA 200.
- the AP 100 transmits the BAR to the STA 200 selected as the BAR transmission destination in step S108.
- step S116 the STA 200 that has received the BAR addressed to itself transmits the BA to the AP 100.
- FIG. 5 is a flowchart showing an example of a flow of reception status information reply processing executed in the STA 200 according to the present embodiment.
- step S ⁇ b> 202 the wireless communication unit 210 receives a reception status information request message from the AP 100.
- step S204 the control unit 230 acquires from the reception status information request message the identifier of the reception status information requested by the STA 200 and a threshold value for determining whether to transmit the reception status information.
- the control unit 230 may acquire the measurement start time and measurement period from the reception status information request message.
- step S206 the control unit 230 identifies the reception status information requested by the AP 100 from the identifier acquired in step S204.
- step S208 the control unit 230 calculates the reception status information identified in step S206. For example, the control unit 230 performs measurement for a measurement period from the measurement start time acquired in step S204, and calculates reception status information based on the measurement result.
- step S210 the control unit 230 determines whether or not the threshold value has been successfully acquired in step S204.
- step S212 the control unit 230 determines whether there is reception status information whose reception status is worse than the threshold. For example, the control unit 230 performs the main determination by comparing the threshold acquired in step S204 with the reception status information calculated in step S208. In addition, when a plurality of threshold values are acquired in step S204, the control unit 230 has a reception status that is higher than the threshold value for any one of the plurality of threshold values, any plurality, or all threshold values that have been successfully acquired. It may be determined whether there is bad reception status information.
- step S214 the control unit 230 controls the wireless communication unit 210 to transmit a reception status information reply message.
- the control unit 230 includes the reception status information calculated in step S208 in the reception status information reply message, and causes the wireless communication unit 210 to transmit to the AP 100. The same applies when it is determined that acquisition of the threshold value has failed (S210 / NO).
- the control unit 230 When it is determined that there is no reception status information whose reception status is worse than the threshold (S212 / NO), the control unit 230 does not transmit the reception status information reply message. In this case, the control unit 230 may periodically make the determination according to step S212 and transmit a reception status information reply message when reception status information having a reception status worse than the threshold value is generated.
- FIG. 6 is a flowchart illustrating an example of the flow of a BAR transmission destination selection process executed in the AP 100 according to the present embodiment.
- step S302 the wireless communication unit 110 receives a reception status information reply message from the STA 200.
- step S304 the control unit 130 acquires the reception status information from the reception status information reply message.
- step S306 the control unit 130 determines whether or not the reception status is within the threshold range. For example, the control unit 130 determines whether the reception status information is included in the range of the upper limit value and the lower limit value that are set in advance or calculated based on the degree of congestion or the like.
- step S308 the control unit 130 adds the STA 200 that is the transmission source of the reception status information to the BAR transmission destination candidate list. Note that the control unit 130 may update the BAR transmission destination candidate list every time a reception status information reply message from the STA 200 is received.
- step S310 the control unit 130 sets the maximum number of BAR transmission destination STAs 200. For example, the control unit 130 sets the maximum number based on information indicating the degree of congestion of the propagation path acquired from the reception status information reply message.
- step S312 the control unit 130 selects, as a BAR transmission destination, STAs 200 equal to or less than the maximum number set from the candidate list.
- the control unit 130 may select BAR transmission destinations in order of poor reception status among the STAs 200 included in the candidate list.
- step S314 the control unit 130 controls the wireless communication unit 110 to transmit a BAR transmission destination notification message indicating that the BAR transmission destination has been selected to the STA 200 of the BAR transmission destination.
- the control unit 130 sets the transmission trigger for the BAR start request message or the BAR stop request message in the STA 200 by transmitting the transmission destination change request trigger setting message to the STA 200.
- the control unit 130 may control the wireless communication unit 110 to transmit the transmission destination change request trigger setting message using at least one of a broadcast frame and a multicast frame addressed to the multicast group to which the STA 200 belongs.
- a frame for example, a beacon frame can be used.
- Various information can be included in the transmission destination change request trigger setting message.
- the transmission destination change request trigger setting message may include at least one of information indicating a threshold value of an elapsed time since the BAR was last received and information indicating a threshold value of reception status information.
- the transmission destination change request trigger setting message includes information indicating the threshold of the received power of the BA from another STA 200 (wireless communication terminal) belonging to the same multicast group as the target STA 200, and the threshold of the number of receptions of the BA.
- at least one of information indicating a threshold value of a correlation value with the BA bitmap included in the BA may be included.
- the control unit 130 sets, for example, a raw value for each of the above values (elapsed time, reception status information, etc.) or a value uniquely derived from a quantized value, an instantaneous value, an average value, or other raw values as a threshold value. You may use for.
- a destination change request trigger setting message related to a trigger for transmitting a BAR start request message will be described.
- information indicating a threshold value during a period in which no BAR is received information indicating a threshold value of reception status information, or information indicating an upper limit number of BAR start request messages that can be transmitted in a beacon interval may be included.
- the information indicating the threshold value of the reception status information may be information indicating the threshold value regarding the value of the reception status information itself, or may be information indicating the threshold value regarding the rate of change of the value of the reception status information.
- the control unit 130 uses, for example, a raw value for each of the above values (period, reception status information, etc.) or a value that is uniquely derived from a quantized value, an instantaneous value, an average value, or other raw values as a threshold value. It may be used.
- the control unit 130 selects a transmission destination of the BAR based on the transmission destination change request message received by the wireless communication unit 110.
- the control unit 130 determines whether or not to stop transmission of the BAR to the transmission source STA 200 based on the BAR stop request message. At that time, the control unit 130 may perform the determination using different criteria according to the trigger identifier included in the BAR stop request message. When it is determined that the transmission of the BAR to the transmission source STA 200 is stopped, the control unit 130 may transmit a message for notifying the transmission of the BAR to the STA 200. Similarly, when it is determined that the transmission of the BAR to the transmission source STA 200 is not stopped, the control unit 130 may transmit a message to the STA 200 for notifying that the transmission of the BAR is not stopped. In addition, when it is determined that the transmission of the BAR to the transmission source STA 200 is stopped, the control unit 130 may select a new transmission destination from the BAR transmission destination candidate list.
- the control unit 130 determines whether to start transmission of the BAR to the transmission source STA 200 based on the BAR start request message. At that time, the control unit 130 may perform the determination based on the reception status information and the BA bitmap included in the BAR start request message. When determining that the transmission of the BAR to the transmission source STA 200 is started, the control unit 130 may exclude at least one of the STAs 200 selected as the transmission destination of the BAR until then from the transmission destination. . Further, when it is determined that the transmission of the BAR to the transmission source STA 200 is started, the control unit 130 may transmit a message for notifying the start of the transmission of the BAR to the STA 200.
- control unit 130 may transmit a message for notifying that the transmission of the BAR is not started to the STA 200. Further, when a BA bitmap is included in the BAR start request message, the control unit 230 may retransmit the multicast packet based on the BA bitmap.
- control unit 230 controls the wireless communication unit 210 to transmit a BAR stop request message using various triggers exemplified below. Note that the control unit 230 may use a combination of a plurality of triggers.
- control unit 230 can be triggered by the fact that it is the transmission destination of the BAR. Thereby, the STA 200 can avoid sending an unnecessary BAR stop request message. For example, when the control unit 230 has successfully received the BAR addressed to itself within the threshold of the elapsed time designated by the transmission destination change request trigger setting message, or is notified from the AP 100 that it is the transmission destination of the BAR. Then, it knows that it is the transmission destination of BAR.
- the control unit 230 can be triggered by the reception status information being improved from a threshold value.
- the AP 100 can change the transmission destination of the BAR from the STA 200 whose reception status information is improved by movement or the like to another STA 200 having a reception status worse than that of the STA 200.
- the reception status (throughput, etc.) of the entire multicast group can be improved.
- the control unit 230 causes the BAR stop request message to be transmitted when the reception status information is improved from the threshold value specified by the transmission destination change request trigger setting message.
- reception status when the reception status (or reception status information) is improved from the threshold value, for example, when the reception status information is a throughput, a transition is made from a state where a value smaller than the threshold is calculated to a state where a value larger than the threshold is calculated. To do.
- the situation in which the reception status (or reception status information) is worse than the threshold value means the opposite of these.
- control unit 230 can be triggered by the successful reception of a BA from another STA 200 (wireless communication terminal) belonging to the multicast group to which the control unit 230 belongs.
- Successful reception of a BA from another STA 200 is presumed that the other STA 200 and the other STA 200 are close to each other, so that redundant BA responses can be avoided.
- packet errors occur due to distance attenuation, fading, shadowing, and collisions with other packets.
- the distance attenuation rate, shadowing, and the amount of interference due to collisions with other packets Correlation may be high.
- control unit 230 may use a trigger when the received power of the BA from another STA 200 that has been successfully received exceeds a threshold value. Further, the control unit 230 may use a trigger that the number of successful receptions of BAs from other STAs 200 exceeds a threshold value.
- control unit 230 may be triggered by the fact that the correlation value between the BA bitmap included in the BA from another STA 200 that has been successfully received and the BA bitmap related to reception in the wireless communication unit 210 exceeds a threshold value. . This is because the higher the correlation value, the more the BA that it answers becomes redundant.
- control unit 230 can be triggered by detecting that it has left the multicast group.
- control unit 230 causes a BAR stop request message to be transmitted when detecting the end of an application requiring wireless communication or the like.
- the AP 100 can change the transmission destination of the BAR from the STA 200 that has not returned the BA due to the withdrawal from the STA 200 to another STA 200.
- the BAR stop request message may include a trigger identifier indicating which of the above triggers is used for transmission.
- the AP 100 can determine whether to stop transmission of the BAR to the STA 200 with reference to this identifier.
- control unit 230 controls the wireless communication unit 210 to transmit a BAR start request message using various triggers exemplified below. Note that the control unit 230 may use a combination of a plurality of triggers.
- control unit 230 can be triggered by the fact that it is not the BAR transmission destination. Thereby, the STA 200 can avoid transmission of an unnecessary BAR start request message. For example, the control unit 230 can be triggered by a period during which the BAR is not received exceeding a threshold specified by the transmission destination change request trigger setting message. In addition, the control unit 230 can be triggered by notification from the AP 100 that it is not a BAR transmission destination.
- control unit 230 can be triggered by the fact that the upper limit number of BAR start request messages that can be transmitted in a predetermined period specified by the transmission destination change request trigger setting message has not been reached.
- the predetermined period may be a beacon interval, for example.
- the predetermined period may be an integral multiple of the beacon interval, may be a time such as a few microseconds, or may be a period during which the STA 200 is connected to the multicast group. .
- the control unit 230 can be triggered by the fact that the reception status information is worse than a threshold value. Thereby, the AP 100 can set the STA 200 whose reception status information has deteriorated due to movement or the like as the transmission destination of the BAR. This can improve the reception status of the entire multicast group. For example, the control unit 230 transmits a BAR start request message when the reception status information is worse than the threshold specified by the transmission destination change request trigger setting message or when the deterioration rate of the reception status information exceeds the threshold.
- the BAR start request message may include a BA bitmap related to multicast transmission from the AP 100. Further, the BAR start request message may include reception status information in the wireless communication unit 210 related to multicast transmission from the AP 100.
- the BAR start request message preferably includes a BA bitmap for retransmission of the multicast packet from the AP 100.
- the BAR start request message may be a BA or a radio measurement report frame.
- FIG. 7 is a sequence diagram illustrating an example of the flow of a BAR transmission destination change process executed in the wireless communication system 1 according to the present embodiment. As shown in FIG. 7, the AP 100 and the STA 200 are involved in this sequence. In FIG. 7, one STA 200 selected as the BAR transmission destination is shown as a representative, and other STAs 200 are omitted.
- step S402 the AP 100 transmits a transmission destination change request trigger setting message to the STA 200.
- step S404 the STA 200 performs a transmission destination change request execution determination process. For example, the STA 200 determines whether or not the situation matches the trigger set based on the transmission destination change request trigger setting message received in step S402. Here, it is assumed that the situation matches the trigger for transmitting the BAR start request message. The detailed determination criteria here will be described later with reference to FIG.
- step S406 the STA 200 transmits a BAR start request message to the AP 100.
- the AP 100 selects a BAR transmission destination based on the received BAR start request message.
- the STA 200 that is the transmission source of the BAR start request message is selected as the BAR transmission destination.
- step S408 the AP 100 transmits a destination change answer message to the STA 200.
- This transmission destination change response message includes information indicating that the STA 200 has been selected as the transmission destination of the BAR.
- step S410 the AP 100 transmits a BAR to the STA 200.
- the multicast transmission (step S112) described in FIG. 4 is omitted.
- step S412 the STA 200 transmits the BA to the AP 100.
- step S414 the STA 200 performs execution determination processing for the transmission destination change request.
- the situation matches the trigger for transmitting the BAR stop request message.
- the detailed determination criteria here will be described later with reference to FIG.
- step S416 the STA 200 transmits a BAR stop request message to the AP 100.
- the AP 100 selects a BAR transmission destination based on the received BAR stop request message. As a result, it is assumed that the STA 200 that is the transmission source of the BAR stop request message is excluded from the BAR transmission destination.
- step S4108 the AP 100 transmits a destination change answer message to the STA 200.
- This transmission destination change response message includes information indicating that the STA 200 is excluded from the BAR transmission destination.
- FIG. 8 is a flowchart illustrating an example of the flow of a transmission determination process for a BAR start request message executed in the STA 200 according to the present embodiment.
- step S502 the wireless communication unit 210 receives a transmission destination change request trigger setting message.
- the control unit 230 acquires information indicating various threshold values included in the transmission destination change request trigger setting message, and sets a trigger for transmitting the BAR start request message.
- step S504 the control unit 230 determines whether or not the situation matches a trigger for requesting the start of transmission of the BAR to itself. For example, the control unit 230 may determine whether or not itself is a BAR transmission destination and whether or not the upper limit number of BAR start request messages that can be transmitted in the beacon interval has been reached. Further, the control unit 230 may determine whether or not the reception status information has deteriorated from a threshold value.
- step S506 the control unit 230 controls the wireless communication unit 210 to transmit a BAR start request message to the AP 100.
- FIG. 9 is a flowchart illustrating an example of the flow of a transmission determination process for a BAR stop request message executed in the STA 200 according to the present embodiment.
- step S602 the wireless communication unit 210 receives a transmission destination change request trigger setting message.
- the control unit 230 acquires information indicating various threshold values included in the transmission destination change request trigger setting message, and sets a trigger for transmitting the BAR stop request message.
- step S604 the control unit 230 determines whether or not the situation matches a trigger for requesting stop of transmission of the BAR to itself. For example, the control unit 230 may determine whether or not the control unit 230 is a BAR transmission destination. Further, the control unit 230 determines whether or not the reception status information has improved from the threshold, whether or not the BA has been successfully received from another STA 200 belonging to the multicast group to which the control unit 230 belongs, or withdraws from the multicast group. It may be determined whether or not this is detected.
- step S606 the control unit 230 includes the identifier of the trigger in the BAR stop request message.
- step S608 the control unit 230 controls the wireless communication unit 210 to transmit a BAR stop request message to the AP 100.
- the wireless communication device 200 includes a smartphone, a tablet PC (Personal Computer), a notebook PC, a mobile terminal such as a portable game terminal or a digital camera, a fixed terminal such as a television receiver, a printer, a digital scanner, or a network storage, or You may implement
- the wireless communication device 200 is a terminal (also referred to as an MTC (Machine Type Communication) terminal) that performs M2M (Machine To Machine) communication, such as a smart meter, a vending machine, a remote monitoring device, or a POS (Point Of Sale) terminal. It may be realized as.
- the wireless communication device 200 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these terminals.
- the wireless communication device 100 may be realized as a wireless LAN access point (also referred to as a wireless base station) having a router function or not having a router function. Further, the wireless communication device 100 may be realized as a mobile wireless LAN router. Further, the wireless communication device 100 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these devices.
- a wireless LAN access point also referred to as a wireless base station
- the wireless communication device 100 may be realized as a mobile wireless LAN router.
- the wireless communication device 100 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these devices.
- FIG. 10 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied.
- the smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 913, an antenna switch 914, an antenna 915, A bus 917, a battery 918, and an auxiliary controller 919 are provided.
- the processor 901 may be, for example, a CPU (Central Processing Unit) or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900.
- the memory 902 includes a RAM (Random Access Memory) and a ROM (Read Only Memory), and stores programs and data executed by the processor 901.
- the storage 903 can include a storage medium such as a semiconductor memory or a hard disk.
- the external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
- the camera 906 includes, for example, an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image.
- the sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor.
- the microphone 908 converts sound input to the smartphone 900 into an audio signal.
- the input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button, or a switch, and receives an operation or information input from a user.
- the display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900.
- the speaker 911 converts an audio signal output from the smartphone 900 into audio.
- the wireless communication interface 913 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and performs wireless communication.
- the wireless communication interface 913 can communicate with other devices via a wireless LAN access point in the infrastructure mode.
- the wireless communication interface 913 can directly communicate with other devices in an ad hoc mode or a direct communication mode such as Wi-Fi Direct (registered trademark).
- Wi-Fi Direct unlike the ad hoc mode, one of two terminals operates as an access point, but communication is performed directly between the terminals.
- the wireless communication interface 913 can typically include a baseband processor, an RF (Radio Frequency) circuit, a power amplifier, and the like.
- the wireless communication interface 913 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 913 may support other types of wireless communication methods such as a short-range wireless communication method, a proximity wireless communication method, or a cellular communication method in addition to the wireless LAN method.
- the antenna switch 914 switches the connection destination of the antenna 915 among a plurality of circuits (for example, circuits for different wireless communication schemes) included in the wireless communication interface 913.
- the antenna 915 includes a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna), and is used for transmission and reception of radio signals by the radio communication interface 913.
- the smartphone 900 is not limited to the example in FIG. 10, and may include a plurality of antennas (for example, an antenna for a wireless LAN and an antenna for a proximity wireless communication method). In that case, the antenna switch 914 may be omitted from the configuration of the smartphone 900.
- the bus 917 connects the processor 901, memory 902, storage 903, external connection interface 904, camera 906, sensor 907, microphone 908, input device 909, display device 910, speaker 911, wireless communication interface 913, and auxiliary controller 919 to each other.
- the battery 918 supplies power to each block of the smartphone 900 illustrated in FIG. 10 through a power supply line partially illustrated by a broken line in the drawing.
- the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.
- the smartphone 900 shown in FIG. 10 one or more components (for example, at least one of the wireless communication unit 210, the storage unit 220, or the control unit 230) included in the wireless communication device 200 described with reference to FIG.
- the wireless communication interface 913 may be implemented.
- at least some of these components may be implemented in the processor 901 or the auxiliary controller 919.
- the smartphone 900 may include a module including the wireless communication interface 913, the processor 901, and / or the auxiliary controller 919, and the one or more components may be mounted on the module.
- the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), and stores the program.
- a program for causing a processor to function as one or more components may be installed in the smartphone 900, and the wireless communication interface 913, the processor 901, and / or the auxiliary controller 919 may execute the program.
- the smartphone 900 or the module may be provided as a device including the one or more components, and a program for causing a processor to function as the one or more components may be provided.
- a readable recording medium in which the program is recorded may be provided.
- the smartphone 900 may operate as a wireless access point (software AP) when the processor 901 executes the access point function at the application level. Further, the wireless communication interface 913 may have a wireless access point function.
- FIG. 11 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied.
- the car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication.
- An interface 933, an antenna switch 934, an antenna 935, and a battery 938 are provided.
- the processor 921 may be a CPU or SoC, for example, and controls the navigation function and other functions of the car navigation device 920.
- the memory 922 includes RAM and ROM, and stores programs and data executed by the processor 921.
- the GPS module 924 measures the position (for example, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites.
- the sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and an atmospheric pressure sensor.
- the data interface 926 is connected to the in-vehicle network 941 through a terminal (not shown), for example, and acquires data generated on the vehicle side such as vehicle speed data.
- the content player 927 reproduces content stored in a storage medium (for example, CD or DVD) inserted into the storage medium interface 928.
- the input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and receives an operation or information input from the user.
- the display device 930 has a screen such as an LCD or an OLED display, and displays a navigation function or an image of content to be reproduced.
- the speaker 931 outputs the navigation function or the audio of the content to be played back.
- the wireless communication interface 933 supports one or more wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and executes wireless communication.
- the wireless communication interface 933 can communicate with other devices via a wireless LAN access point in the infrastructure mode.
- the wireless communication interface 933 can directly communicate with other devices in an ad hoc mode or a direct communication mode such as Wi-Fi Direct.
- the wireless communication interface 933 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 933 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a proximity wireless communication system, or a cellular communication system.
- the antenna switch 934 switches the connection destination of the antenna 935 among a plurality of circuits included in the wireless communication interface 933.
- the antenna 935 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 933.
- the car navigation apparatus 920 is not limited to the example of FIG. 11 and may include a plurality of antennas. In that case, the antenna switch 934 may be omitted from the configuration of the car navigation device 920.
- the battery 938 supplies power to each block of the car navigation apparatus 920 shown in FIG. 11 through a power supply line partially shown by broken lines in the drawing. Further, the battery 938 stores electric power supplied from the vehicle side.
- one or more components included in the wireless communication device 200 described with reference to FIG. May be implemented in the wireless communication interface 933. Further, at least a part of these functions may be implemented in the processor 921.
- the car navigation device 920 may include a module including the wireless communication interface 933 and / or the processor 921, and the one or more components may be mounted on the module. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), and stores the program. May be executed.
- a program for causing a processor to function as one or more components may be installed in the car navigation device 920, and the wireless communication interface 933 and / or the processor 921 may execute the program.
- the car navigation apparatus 920 or the module may be provided as an apparatus including the one or more components, and a program for causing a processor to function as the one or more components may be provided.
- a readable recording medium in which the program is recorded may be provided.
- the wireless communication interface 933 may operate as the above-described AP 100 and provide a wireless connection to a terminal of a user who gets on the vehicle.
- the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942.
- vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.
- FIG. 12 is a block diagram illustrating an example of a schematic configuration of a wireless access point 950 to which the technology according to the present disclosure can be applied.
- the wireless access point 950 includes a controller 951, a memory 952, an input device 954, a display device 955, a network interface 957, a wireless communication interface 963, an antenna switch 964, and an antenna 965.
- the controller 951 may be a CPU or a DSP (Digital Signal Processor), for example, and various functions (for example, access restriction, routing, encryption, firewall) of the IP (Internet Protocol) layer and higher layers of the wireless access point 950 And log management).
- the memory 952 includes a RAM and a ROM, and stores programs executed by the controller 951 and various control data (for example, a terminal list, a routing table, an encryption key, security settings, and a log).
- the input device 954 includes, for example, a button or a switch and receives an operation from the user.
- the display device 955 includes an LED lamp and the like, and displays the operation status of the wireless access point 950.
- the network interface 957 is a wired communication interface for connecting the wireless access point 950 to the wired communication network 958.
- the network interface 957 may have a plurality of connection terminals.
- the wired communication network 958 may be a LAN such as Ethernet (registered trademark), or may be a WAN (Wide Area Network).
- the wireless communication interface 963 supports one or more of wireless LAN standards such as IEEE802.11a, 11b, 11g, 11n, 11ac, and 11ad, and provides a wireless connection as an access point to nearby terminals.
- the wireless communication interface 963 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 963 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the antenna switch 964 switches the connection destination of the antenna 965 among a plurality of circuits included in the wireless communication interface 963.
- the antenna 965 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 963.
- the wireless access point 950 shown in FIG. 12 one or more components included in the wireless communication device 100 described with reference to FIG. 2 (for example, at least one of the wireless communication unit 110, the storage unit 120, or the control unit 130). May be implemented in the wireless communication interface 963. In addition, at least a part of these functions may be implemented in the controller 951. As an example, the wireless access point 950 may include a module including the wireless communication interface 963 and / or the controller 951, and the one or more components may be mounted on the module. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components), and stores the program. May be executed.
- a program for causing a processor to function as one or more components may be installed in the wireless access point 950, and the wireless communication interface 963 and / or the controller 951 may execute the program.
- the wireless access point 950 or the module may be provided as a device including the one or more components, and a program for causing a processor to function as the one or more components may be provided.
- a readable recording medium in which the program is recorded may be provided.
- the STA 200 that performs wireless communication with the AP 100 transmits, to the AP 100, a transmission destination change request message that requests a change in the transmission destination of the BAR related to multicast transmission by the AP 100.
- the AP 100 can flexibly change the transmission destination of the BAR based on the transmission destination change request message from the STA 200.
- wireless communications system 1 can improve the reliability of the whole multicast group.
- the transmission destination change request message may be a message requesting to include the STA 200 itself in the transmission destination of the BAR.
- the AP 100 can select the STA 200 having a poor reception status as a BAR transmission destination, and can improve reliability by appropriate retransmission.
- the transmission destination change request message may be a message requesting to exclude the STA 200 itself from the transmission destination of the BAR.
- the AP 100 can change the transmission destination of the BAR from the STA 200 with good reception status to the STA 200 with poor reception status, and can improve the reliability of the entire wireless communication system 1.
- processing described with reference to the flowcharts and sequence diagrams in this specification is not necessarily executed in the order shown. Some processing steps may be performed in parallel. Further, additional processing steps may be employed, and some processing steps may be omitted.
- a wireless communication unit that performs wireless communication with other wireless communication devices;
- a control unit that controls the wireless communication unit to transmit a first message requesting a change of a transmission destination of a delivery confirmation request frame related to multicast transmission by the other wireless communication device to the other wireless communication device;
- a wireless communication device comprising: (2) The wireless communication device according to (1), wherein the first message is a message requesting to include the wireless communication device in a transmission destination of the delivery confirmation request frame.
- the first message includes a delivery acknowledgment bitmap related to the multicast transmission.
- the information on the reception status includes at least one of throughput, packet loss rate, number of multicast packets successfully received, number of multicast packets failed to be received, or ratio of the sum of noise power and interference signal power to desired signal power
- the wireless communication device including: (6)
- the control unit triggers at least one of a period during which the delivery confirmation request frame has not been received exceeds a threshold value, or information regarding a reception status in the wireless communication unit related to the multicast transmission has deteriorated from the threshold value.
- the wireless communication device according to any one of (2) to (5), wherein the wireless communication unit is controlled to transmit the first message as: (7) The wireless communication device according to (1), wherein the first message is a message requesting to exclude the wireless communication device from a transmission destination of a delivery confirmation request frame. (8) The control unit has successfully received a delivery confirmation response frame from another wireless communication terminal belonging to the multicast group to which the wireless communication device belongs, or the reception power of the delivery confirmation response frame has exceeded a threshold value.
- the first message is transmitted with at least one of To control so that the wireless communication unit, a wireless communication apparatus according to (7).
- a wireless communication unit that performs wireless communication with other wireless communication devices; Based on the first message requesting the change of the transmission destination of the delivery confirmation request frame received from the other wireless communication device by the wireless communication unit, the delivery confirmation request frame related to multicast transmission by the wireless communication unit A control unit for selecting a transmission destination;
- a wireless communication device comprising: (10) The control unit according to (9), wherein the control unit selects a transmission destination of the delivery confirmation request frame based on information on reception status in one or more of the other wireless communication devices belonging to the multicast group related to the multicast transmission. Wireless communication device.
- the control unit sends a third message including information used for a trigger for transmitting the first message in the other wireless communication device to a broadcast frame and a multicast frame addressed to a multicast group related to the multicast transmission.
- the wireless communication device according to (9) or (10), wherein the wireless communication unit is controlled to transmit using at least one of them.
- the first message is a message requesting to include the other wireless communication device in the transmission destination of the delivery confirmation request frame;
- the third message is transmitted using a beacon frame, information indicating a threshold value during a period when the delivery confirmation request frame is not received, information indicating a threshold value of information regarding a reception status in the other wireless communication device, or
- the wireless communication device according to (11) including at least one of pieces of information indicating an upper limit number of the first message that can be transmitted in a beacon interval.
- the first message is a message requesting to exclude the wireless communication device from a transmission destination of the delivery confirmation request frame;
- the third message is transmitted using a beacon frame and includes information indicating a threshold value of an elapsed time since the delivery confirmation request frame was last received, and a threshold value of information regarding a reception status in the other wireless communication device.
- the wireless communication device according to (11) including at least one of information indicating a threshold value of a correlation value with a delivery confirmation response bitmap included in the delivery confirmation response frame.
- the wireless communication device according to any one of (9) to (13), wherein the control unit sets a maximum number of transmission destinations of the delivery confirmation request frame.
- the control unit controls the wireless communication unit to transmit a second message including information indicating a selection result of a transmission destination of the delivery confirmation request frame to the other wireless communication device that is a transmission source of the first message.
- the wireless communication device according to any one of (9) to (14), which is controlled.
- the control unit controls transmission power of a multicast frame according to a reception status of a transmission destination of the delivery confirmation request frame.
- a wireless communication method including: (18) In a wireless communication device that performs wireless communication with other wireless communication devices, Based on the first message requesting the change of the transmission destination of the delivery confirmation request frame received from the other wireless communication device by the wireless communication device, the delivery confirmation request frame related to multicast transmission by the wireless communication device.
- a wireless communication method including: (19) Computer A wireless communication unit that performs wireless communication with other wireless communication devices; A control unit that controls the wireless communication unit to transmit a first message requesting a change of a transmission destination of a delivery confirmation request frame related to multicast transmission by the other wireless communication device to the other wireless communication device; Program to function as. (20) Computer A wireless communication unit that performs wireless communication with other wireless communication devices; Based on the first message requesting the change of the transmission destination of the delivery confirmation request frame received from the other wireless communication device by the wireless communication unit, the delivery confirmation request frame related to multicast transmission by the wireless communication unit A control unit for selecting a transmission destination; Program to function as.
- Wireless communication system 100 AP 110 wireless communication unit 120 storage unit 130 control unit 200 STA 210 wireless communication unit 220 storage unit 230 control unit
Abstract
Description
1.全体構成
2.基本構成
2.1.AP
2.2.STA
3.機能詳細
3.1.BAR/BAの送受信機能
3.2.BARの送信先変更機能
4.応用例
5.まとめ
まず、図1を参照して、本開示の一実施形態に係る無線通信システムの全体構成を説明する。
<2.1.AP>
図2は、本実施形態に係るAP100の論理的な構成の一例を示すブロック図である。図2に示すように、AP100は、無線通信部110、記憶部120及び制御部130を含む。
無線通信部110は、AP100による他の装置との無線通信を仲介する無線通信インタフェースである。本実施形態では、無線通信部110は、STA200との間で無線通信を行う。例えば、無線通信部110は、STA200から送信された無線信号を受信する。無線通信部110は、増幅器、周波数変換器、及び復調器等としての機能を有していてもよく、例えば受信したデータを制御部130へ出力し得る。また、無線通信部110は、アンテナを介してSTA200へ無線信号を送信する。無線通信部110は、変調器、及び増幅器等としての機能を有していてもよく、例えば制御部130から出力されたデータを、変調及び電力増幅等して送信してもよい。
記憶部120は、所定の記録媒体に対してデータの記録再生を行う部位である。例えば、記憶部120は、制御部130により選択されたBARの送信先を示す情報を記憶する。
制御部130は、演算処理装置および制御装置として機能し、各種プログラムに従ってAP100内の動作全般を制御する。
図3は、本実施形態に係るSTA200の論理的な構成の一例を示すブロック図である。図3に示すように、STA200は、無線通信部210、記憶部220及び制御部230を含む。
無線通信部210は、STA200による他の装置との無線通信を仲介する無線通信インタフェースである。本実施形態では、無線通信部210は、AP100との間で無線通信を行う。例えば、無線通信部210は、AP100から送信された無線信号を受信する。無線通信部210は、増幅器、周波数変換器、及び復調器等としての機能を有していてもよく、例えば受信したデータを制御部230へ出力し得る。また、無線通信部210は、アンテナを介してAP100へ無線信号を送信する。無線通信部210は、変調器、及び増幅器等としての機能を有していてもよく、例えば制御部230から出力されたデータを、変調及び電力増幅等して送信してもよい。
記憶部220は、所定の記録媒体に対してデータの記録再生を行う部位である。例えば、記憶部220は、AP100により通知された送信先変更要求トリガ設定メッセージ等に含まれる情報を記憶する。
制御部230は、演算処理装置および制御装置として機能し、各種プログラムに従ってSTA200内の動作全般を制御する。
以下では、AP100及びSTA200における、BAR及びBAを送受信するBAR/BAの送受信機能、及びBARの送信先を変更するBARの送信先変更機能について、それぞれ詳細に説明する。
(AP側の機能詳細)
上述したように、制御部130は、受信状況情報要求メッセージをSTA200へ送信することで、STA200の受信状況情報を取得する。例えば、制御部130は、受信状況情報要求メッセージを、マルチキャスト送信するよう無線通信部110を制御してもよい。これにより、AP100は、マルチキャストグループに属するSTA200の各々の受信状況情報を取得可能となる。受信状況情報要求メッセージには、多様な情報が含まれ得る。
・Channel load request
・Noise histogram request
・Frame request
・STA statistics request
・LCI request
・Transmit stream/category measurement request
・Multicast diagnostics request
・新たなInformation Element
上述したように、制御部230は、受信状況情報回答メッセージをAP100へ送信することで、AP100から要求された受信状況情報を報告する。例えば、制御部230は、受信状況情報要求メッセージを、ユニキャスト送信するよう無線通信部110を制御してもよい。受信状況情報回答メッセージには、多様な情報が含まれ得る。
・Channel load report
・Noise histogram report
・Frame report
・STA statistics report
・LCI report
・Transmit stream/category measurement report
・Multicast diagnostics report
・新たなInformation Element
続いて、BAR/BAの送受信機能に係る動作処理を説明する。まず、図4を参照して、無線通信システム1全体における動作処理例を説明する。
(AP側の機能詳細)
上述したように、制御部130は、送信先変更要求トリガ設定メッセージをSTA200へ送信することで、STA200におけるBAR開始要求メッセージ又はBAR停止要求メッセージの送信トリガを設定する。制御部130は、送信先変更要求トリガ設定メッセージを、ブロードキャストフレーム、STA200が所属するマルチキャストグループ宛てのマルチキャストフレームのうち少なくともひとつを用いて送信するよう無線通信部110を制御してもよい。そのようなフレームとして、例えばビーコンフレームが用いられ得る。送信先変更要求トリガ設定メッセージには、多様な情報が含まれ得る。
まず、BAR停止要求メッセージの送信について説明する。
続いて、BARの送信先変更機能に係る動作処理を説明する。まず、図7を参照して、無線通信システム1全体における動作処理例を説明する。
本開示に係る技術は、様々な製品へ応用可能である。例えば、無線通信装置200は、スマートフォン、タブレットPC(Personal Computer)、ノートPC、携帯型ゲーム端末若しくはデジタルカメラなどのモバイル端末、テレビジョン受像機、プリンタ、デジタルスキャナ若しくはネットワークストレージなどの固定端末、又はカーナビゲーション装置などの車載端末として実現されてもよい。また、無線通信装置200は、スマートメータ、自動販売機、遠隔監視装置又はPOS(Point Of Sale)端末などの、M2M(Machine To Machine)通信を行う端末(MTC(Machine Type Communication)端末ともいう)として実現されてもよい。さらに、無線通信装置200は、これら端末に搭載される無線通信モジュール(例えば、1つのダイで構成される集積回路モジュール)であってもよい。
図10は、本開示に係る技術が適用され得るスマートフォン900の概略的な構成の一例を示すブロック図である。スマートフォン900は、プロセッサ901、メモリ902、ストレージ903、外部接続インタフェース904、カメラ906、センサ907、マイクロフォン908、入力デバイス909、表示デバイス910、スピーカ911、無線通信インタフェース913、アンテナスイッチ914、アンテナ915、バス917、バッテリー918及び補助コントローラ919を備える。
図11は、本開示に係る技術が適用され得るカーナビゲーション装置920の概略的な構成の一例を示すブロック図である。カーナビゲーション装置920は、プロセッサ921、メモリ922、GPS(Global Positioning System)モジュール924、センサ925、データインタフェース926、コンテンツプレーヤ927、記憶媒体インタフェース928、入力デバイス929、表示デバイス930、スピーカ931、無線通信インタフェース933、アンテナスイッチ934、アンテナ935及びバッテリー938を備える。
図12は、本開示に係る技術が適用され得る無線アクセスポイント950の概略的な構成の一例を示すブロック図である。無線アクセスポイント950は、コントローラ951、メモリ952、入力デバイス954、表示デバイス955、ネットワークインタフェース957、無線通信インタフェース963、アンテナスイッチ964及びアンテナ965を備える。
以上、図1~図12を参照して、本開示の一実施形態について詳細に説明した。上記説明したように、AP100との間で無線通信を行うSTA200は、AP100によるマルチキャスト送信に係るBARの送信先の変更を要求する送信先変更要求メッセージをAP100へ送信する。AP100は、STA200からの送信先変更要求メッセージに基づいて、BARの送信先を柔軟に変更することが可能である。これにより、無線通信システム1は、マルチキャストグループ全体の信頼性を向上させることができる。
(1)
他の無線通信装置との間で無線通信を行う無線通信部と、
前記他の無線通信装置によるマルチキャスト送信に係る送達確認要求フレームの送信先の変更を要求する第1のメッセージを前記他の無線通信装置へ送信するよう前記無線通信部を制御する制御部と、
を備える無線通信装置。
(2)
前記第1のメッセージは、前記送達確認要求フレームの送信先に前記無線通信装置を含めるよう要求するメッセージである、前記(1)に記載の無線通信装置。
(3)
前記第1のメッセージは、前記マルチキャスト送信に係る送達確認応答ビットマップを含む、前記(2)に記載の無線通信装置。
(4)
前記第1のメッセージは、前記マルチキャスト送信に係る前記無線通信部における受信状況に関する情報を含む、前記(2)又は(3)に記載の無線通信装置。
(5)
前記受信状況に関する情報は、スループット、パケットロス率、受信に成功したマルチキャストパケットの数、受信に失敗したマルチキャストパケットの数、又は所望信号電力に対する雑音電力と干渉信号電力との和の比の少なくともいずれかを含む、前記(4)に記載の無線通信装置。
(6)
前記制御部は、前記送達確認要求フレームを受信していない期間が閾値を超えたこと、又は前記マルチキャスト送信に係る前記無線通信部における受信状況に関する情報が閾値より悪化したことの少なくともいずれかをトリガとして前記第1のメッセージを送信するよう前記無線通信部を制御する、前記(2)~(5)のいずれか一項に記載の無線通信装置。
(7)
前記第1のメッセージは、送達確認要求フレームの送信先から前記無線通信装置を除外するよう要求するメッセージである、前記(1)に記載の無線通信装置。
(8)
前記制御部は、前記無線通信装置が所属するマルチキャストグループに所属する他の無線通信端末からの送達確認応答フレームの受信に成功したこと、又は前記送達確認応答フレームの受信電力が閾値を超えたこと、前記送達確認応答フレームの受信に成功した回数が閾値を超えたこと、若しくは受信に成功した前記送達確認応答フレームに含まれる送達確認応答ビットマップと前記無線通信部における受信に係る送達確認応答ビットマップとの相関値が閾値を超えたこと、又は前記無線通信装置が前記マルチキャストグループから退会することを検知したこと若しくは前記マルチキャスト送信に係る前記無線通信部における受信状況に関する情報が閾値より改善したことの少なくともいずれかをトリガとして、前記第1のメッセージを送信するよう前記無線通信部を制御する、前記(7)に記載の無線通信装置。
(9)
他の無線通信装置との間で無線通信を行う無線通信部と、
前記無線通信部により前記他の無線通信装置から受信された送達確認要求フレームの送信先の変更を要求する第1のメッセージに基づいて、前記無線通信部によるマルチキャスト送信に係る前記送達確認要求フレームの送信先を選択する制御部と、
を備える無線通信装置。
(10)
前記制御部は、前記マルチキャスト送信に係るマルチキャストグループに属するひとつ以上の前記他の無線通信装置における受信状況に関する情報に基づいて前記送達確認要求フレームの送信先を選択する、前記(9)に記載の無線通信装置。
(11)
前記制御部は、前記他の無線通信装置において前記第1のメッセージを送信するトリガのために用いられる情報を含む第3のメッセージを、ブロードキャストフレーム、前記マルチキャスト送信に係るマルチキャストグループ宛てのマルチキャストフレームのうち少なくともひとつを用いて送信するよう前記無線通信部を制御する、前記(9)又は(10)に記載の無線通信装置。
(12)
前記第1のメッセージは、前記送達確認要求フレームの送信先に前記他の無線通信装置を含めるよう要求するメッセージであり、
前記第3のメッセージは、ビーコンフレームを用いて送信され、前記送達確認要求フレームを受信していない期間の閾値を示す情報、前記他の無線通信装置における受信状況に関する情報の閾値を示す情報、又はビーコン間隔における前記第1のメッセージの送信可能上限数を示す情報の少なくともいずれかを含む、前記(11)に記載の無線通信装置。
(13)
前記第1のメッセージは、前記送達確認要求フレームの送信先から前記無線通信装置を除外するよう要求するメッセージであり、
前記第3のメッセージは、ビーコンフレームを用いて送信され、前記送達確認要求フレームが最後に受信されてからの経過時間の閾値を示す情報、前記他の無線通信装置における受信状況に関する情報の閾値を示す情報、前記他の無線通信装置と同一のマルチキャストグループに所属する他の無線通信端末からの送達確認応答フレームの受信電力の閾値を示す情報、前記送達確認応答フレームの受信回数の閾値を示す情報、又は前記送達確認応答フレームに含まれる送達確認応答ビットマップとの相関値の閾値を示す情報の少なくともいずれかを含む、前記(11)に記載の無線通信装置。
(14)
前記制御部は、前記送達確認要求フレームの送信先の最大数を設定する、前記(9)~(13)のいずれか一項に記載の無線通信装置。
(15)
前記制御部は、前記送達確認要求フレームの送信先の選択結果を示す情報を含む第2のメッセージを前記第1のメッセージの送信元の前記他の無線通信装置へ送信するよう前記無線通信部を制御する、前記(9)~(14)のいずれか一項に記載の無線通信装置。
(16)
前記制御部は、前記送達確認要求フレームの送信先の受信状況に応じてマルチキャストフレームの送信電力を制御する、前記(9)~(15)のいずれか一項に記載の無線通信装置。
(17)
他の無線通信装置との間で無線通信を行う無線通信装置において、
前記他の無線通信装置によるマルチキャスト送信に係る送達確認要求フレームの送信先の変更を要求する第1のメッセージを前記他の無線通信装置へ送信すること、
を含む無線通信方法。
(18)
他の無線通信装置との間で無線通信を行う無線通信装置において、
前記無線通信装置により前記他の無線通信装置から受信された送達確認要求フレームの送信先の変更を要求する第1のメッセージに基づいて、前記無線通信装置によるマルチキャスト送信に係る前記送達確認要求フレームの送信先を選択すること、
を含む無線通信方法。
(19)
コンピュータを、
他の無線通信装置との間で無線通信を行う無線通信部と、
前記他の無線通信装置によるマルチキャスト送信に係る送達確認要求フレームの送信先の変更を要求する第1のメッセージを前記他の無線通信装置へ送信するよう前記無線通信部を制御する制御部と、
として機能させるためのプログラム。
(20)
コンピュータを、
他の無線通信装置との間で無線通信を行う無線通信部と、
前記無線通信部により前記他の無線通信装置から受信された送達確認要求フレームの送信先の変更を要求する第1のメッセージに基づいて、前記無線通信部によるマルチキャスト送信に係る前記送達確認要求フレームの送信先を選択する制御部と、
として機能させるためのプログラム。
100 AP
110 無線通信部
120 記憶部
130 制御部
200 STA
210 無線通信部
220 記憶部
230 制御部
Claims (20)
- 他の無線通信装置との間で無線通信を行う無線通信部と、
前記他の無線通信装置によるマルチキャスト送信に係る送達確認要求フレームの送信先の変更を要求する第1のメッセージを前記他の無線通信装置へ送信するよう前記無線通信部を制御する制御部と、
を備える無線通信装置。 - 前記第1のメッセージは、前記送達確認要求フレームの送信先に前記無線通信装置を含めるよう要求するメッセージである、請求項1に記載の無線通信装置。
- 前記第1のメッセージは、前記マルチキャスト送信に係る送達確認応答ビットマップを含む、請求項2に記載の無線通信装置。
- 前記第1のメッセージは、前記マルチキャスト送信に係る前記無線通信部における受信状況に関する情報を含む、請求項2に記載の無線通信装置。
- 前記受信状況に関する情報は、スループット、パケットロス率、受信に成功したマルチキャストパケットの数、受信に失敗したマルチキャストパケットの数、又は所望信号電力に対する雑音電力と干渉信号電力との和の比の少なくともいずれかを含む、請求項4に記載の無線通信装置。
- 前記制御部は、前記送達確認要求フレームを受信していない期間が閾値を超えたこと、又は前記マルチキャスト送信に係る前記無線通信部における受信状況に関する情報が閾値より悪化したことの少なくともいずれかをトリガとして前記第1のメッセージを送信するよう前記無線通信部を制御する、請求項2に記載の無線通信装置。
- 前記第1のメッセージは、送達確認要求フレームの送信先から前記無線通信装置を除外するよう要求するメッセージである、請求項1に記載の無線通信装置。
- 前記制御部は、前記無線通信装置が所属するマルチキャストグループに所属する他の無線通信端末からの送達確認応答フレームの受信に成功したこと、又は前記送達確認応答フレームの受信電力が閾値を超えたこと、前記送達確認応答フレームの受信に成功した回数が閾値を超えたこと、若しくは受信に成功した前記送達確認応答フレームに含まれる送達確認応答ビットマップと前記無線通信部における受信に係る送達確認応答ビットマップとの相関値が閾値を超えたこと、又は前記無線通信装置が前記マルチキャストグループから退会することを検知したこと若しくは前記マルチキャスト送信に係る前記無線通信部における受信状況に関する情報が閾値より改善したことの少なくともいずれかをトリガとして、前記第1のメッセージを送信するよう前記無線通信部を制御する、請求項7に記載の無線通信装置。
- 他の無線通信装置との間で無線通信を行う無線通信部と、
前記無線通信部により前記他の無線通信装置から受信された送達確認要求フレームの送信先の変更を要求する第1のメッセージに基づいて、前記無線通信部によるマルチキャスト送信に係る前記送達確認要求フレームの送信先を選択する制御部と、
を備える無線通信装置。 - 前記制御部は、前記マルチキャスト送信に係るマルチキャストグループに属するひとつ以上の前記他の無線通信装置における受信状況に関する情報に基づいて前記送達確認要求フレームの送信先を選択する、請求項9に記載の無線通信装置。
- 前記制御部は、前記他の無線通信装置において前記第1のメッセージを送信するトリガのために用いられる情報を含む第3のメッセージを、ブロードキャストフレーム、前記マルチキャスト送信に係るマルチキャストグループ宛てのマルチキャストフレームのうち少なくともひとつを用いて送信するよう前記無線通信部を制御する、請求項9に記載の無線通信装置。
- 前記第1のメッセージは、前記送達確認要求フレームの送信先に前記他の無線通信装置を含めるよう要求するメッセージであり、
前記第3のメッセージは、ビーコンフレームを用いて送信され、前記送達確認要求フレームを受信していない期間の閾値を示す情報、前記他の無線通信装置における受信状況に関する情報の閾値を示す情報、又はビーコン間隔における前記第1のメッセージの送信可能上限数を示す情報の少なくともいずれかを含む、請求項11に記載の無線通信装置。 - 前記第1のメッセージは、前記送達確認要求フレームの送信先から前記無線通信装置を除外するよう要求するメッセージであり、
前記第3のメッセージは、ビーコンフレームを用いて送信され、前記送達確認要求フレームが最後に受信されてからの経過時間の閾値を示す情報、前記他の無線通信装置における受信状況に関する情報の閾値を示す情報、前記他の無線通信装置と同一のマルチキャストグループに所属する他の無線通信端末からの送達確認応答フレームの受信電力の閾値を示す情報、前記送達確認応答フレームの受信回数の閾値を示す情報、又は前記送達確認応答フレームに含まれる送達確認応答ビットマップとの相関値の閾値を示す情報の少なくともいずれかを含む、請求項11に記載の無線通信装置。 - 前記制御部は、前記送達確認要求フレームの送信先の最大数を設定する、請求項9に記載の無線通信装置。
- 前記制御部は、前記送達確認要求フレームの送信先の選択結果を示す情報を含む第2のメッセージを前記第1のメッセージの送信元の前記他の無線通信装置へ送信するよう前記無線通信部を制御する、請求項9に記載の無線通信装置。
- 前記制御部は、前記送達確認要求フレームの送信先の受信状況に応じてマルチキャストフレームの送信電力を制御する、請求項9に記載の無線通信装置。
- 他の無線通信装置との間で無線通信を行う無線通信装置において、
前記他の無線通信装置によるマルチキャスト送信に係る送達確認要求フレームの送信先の変更を要求する第1のメッセージを前記他の無線通信装置へ送信すること、
を含む無線通信方法。 - 他の無線通信装置との間で無線通信を行う無線通信装置において、
前記無線通信装置により前記他の無線通信装置から受信された送達確認要求フレームの送信先の変更を要求する第1のメッセージに基づいて、前記無線通信装置によるマルチキャスト送信に係る前記送達確認要求フレームの送信先を選択すること、
を含む無線通信方法。 - コンピュータを、
他の無線通信装置との間で無線通信を行う無線通信部と、
前記他の無線通信装置によるマルチキャスト送信に係る送達確認要求フレームの送信先の変更を要求する第1のメッセージを前記他の無線通信装置へ送信するよう前記無線通信部を制御する制御部と、
として機能させるためのプログラム。 - コンピュータを、
他の無線通信装置との間で無線通信を行う無線通信部と、
前記無線通信部により前記他の無線通信装置から受信された送達確認要求フレームの送信先の変更を要求する第1のメッセージに基づいて、前記無線通信部によるマルチキャスト送信に係る前記送達確認要求フレームの送信先を選択する制御部と、
として機能させるためのプログラム。
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