WO2017081906A1 - 通信装置および通信方法 - Google Patents
通信装置および通信方法 Download PDFInfo
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- WO2017081906A1 WO2017081906A1 PCT/JP2016/074625 JP2016074625W WO2017081906A1 WO 2017081906 A1 WO2017081906 A1 WO 2017081906A1 JP 2016074625 W JP2016074625 W JP 2016074625W WO 2017081906 A1 WO2017081906 A1 WO 2017081906A1
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- communication
- wireless communication
- communication network
- phy header
- network identifier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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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
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present disclosure relates to a communication device and a communication method.
- wireless LAN Local Area Network
- IEEE Institute of Electrical and Electronics Engineers 802.11
- wireless LAN products (hereinafter also simply referred to as communication devices) are increasing.
- many of the wireless LAN compatible products are portable communication terminals. Since the portable communication terminal has limited opportunities to receive power supply from the outside, it is desired that power consumption be suppressed.
- the power consumption of a communication device (hereinafter also simply referred to as STA) operating as an STA (Station) is stored by storing information specifying a communication destination in a PLCP (Physical Layer Convergence Protocol) header.
- STA communication device
- PLCP Physical Layer Convergence Protocol
- a method of reducing is disclosed. Specifically, a partial identifier formed from BSSID (Basic Service Set Identifier) or AID (Association Identifier) is stored in the PLCP header.
- BSSID Basic Service Set Identifier
- AID Association Identifier
- the STA that receives the PLCP header indicates a partial identifier other than the partial identifier of the BSSID related to the BSS to which the own device belongs (hereinafter also referred to as the own BSS) or the partial identifier of the AID assigned to the own device
- the own apparatus is caused to sleep without receiving the succeeding PLCP header. Thereby, it is considered that the power consumption of the STA is reduced.
- the AID described above is assigned to the STA by a communication device (hereinafter also simply referred to as AP) that operates as an AP (Access Point). Specifically, the AID is assigned to the STA through an association process between the AP and the STA, which is one of the components of the BSS.
- AP communication device
- AP Access Point
- the communication efficiency may be lowered in communication destined for a plurality of wireless communication networks.
- the partial identifier of the BSSID is included in the PLCP header, if there are a plurality of destination BSSs, a plurality of partial identifiers of the BSSID are also included. Therefore, as the destination BSS increases, the size of the PLCP header also increases, and the communication time of the PLCP header increases. As a result, the communication efficiency of the frame including the PLCP header decreases.
- the present disclosure proposes a mechanism capable of suppressing a reduction in communication efficiency while reducing power consumption even in communication destined for a plurality of wireless communication networks.
- the communication unit includes a communication unit that transmits a frame having a PHY (Physical Layer) header having a wireless communication network identifier, and the wireless communication network identifier includes a plurality of first-level wireless communication network identifiers.
- a communication device is provided that includes a second level wireless communication network identifier.
- a communication unit that receives a PHY (Physical Layer) header having a wireless communication network identifier is provided, and a plurality of first level wireless communication network identifiers are specified as the wireless communication network identifier.
- a communication apparatus is provided that includes a second level wireless communication network identifier, and wherein the communication unit receives the successor of the PHY header based on the second level wireless communication network identifier.
- the communication unit includes transmitting a frame having a PHY (Physical Layer) header having a wireless communication network identifier, wherein the wireless communication network identifier includes a plurality of first level wireless communications.
- a communication method is provided that includes a second level wireless communication network identifier for which a network identifier is specified.
- the communication unit includes receiving a PHY (Physical Layer) header having a wireless communication network identifier, and the wireless communication network identifier includes a plurality of first level wireless communication network identifiers.
- a communication method is provided that includes a second level wireless communication network identifier that is identified, and includes receiving a continuation of the PHY header based on the second level wireless communication network identifier by a prior period communication unit.
- a mechanism capable of suppressing a reduction in communication efficiency while reducing power consumption even in communication destined for a plurality of wireless communication networks is provided.
- 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. 3 is a diagram illustrating an example of a schematic configuration of a communication system and various information setting states according to the first embodiment of the present disclosure.
- FIG. 3 is a block diagram illustrating an example of a schematic functional configuration of a communication device according to the embodiment.
- FIG. 2 is a block diagram illustrating an example of a schematic functional configuration of a wireless communication module according to the embodiment.
- FIG. It is a figure which shows the structural example of the flame
- FIG. 4 is a frame sequence diagram for explaining an example of communication using an unspecified wild card PID in the communication system according to the embodiment. It is a schematic diagram for demonstrating the example of the communication using the specific wild card PID in the communication system which concerns on the embodiment.
- FIG. 5 is a frame sequence diagram for explaining an example of communication using a specific wildcard PID in the communication system according to the embodiment.
- FIG. 4 is a frame sequence diagram for explaining an example of communication using mesh network link identification information in the communication system according to the embodiment. It is a block diagram which shows an example of a schematic structure of a smart phone. It is a block diagram which shows an example of a schematic structure of a car navigation apparatus. It is a block diagram which shows an example of a schematic structure of a wireless access point.
- a plurality of constituent elements having substantially the same functional configuration may be distinguished by adding different numbers after the same reference numerals.
- a plurality of configurations having substantially the same function are distinguished as necessary, such as the communication device 100A and the communication device 100B.
- the same reference numerals are given.
- the communication device 100A and the communication device 100B they are simply referred to as the communication device 100.
- First embodiment (communication using a wild card PID) 1-1.
- System configuration 1-2. Functional configuration of apparatus 1-3. Functional details of the device 1-4. Processing of apparatus 1-5.
- Summary of first embodiment Second embodiment (communication using direct link identification information) 2-1.
- Example of operation 2-4. 2.
- Summary of the second embodiment Third embodiment (communication using mesh network link identification information) 3-1.
- Detailed function of device 3-2. Processing of apparatus 3-3.
- a PHY header including a wireless communication network identifier (hereinafter also referred to as a PHY identifier or PID) is communicated to specify a plurality of first level PIDs (hereinafter also referred to as normal PIDs). Communication using a second level PID (hereinafter also referred to as a wild card PID) is performed.
- FIG. 1 is a diagram illustrating an example of a schematic configuration of a communication system and various information setting states according to the first embodiment of the present disclosure.
- the communication system includes an AP 100 and a STA 200.
- the communication system includes a plurality of APs 100 and STAs 200, and a wireless communication network is formed by one AP 100 and one or more STAs 200.
- BSS1 including AP100A and STA200A and 200B is formed
- BSS2 including AP100B and STA200C is formed
- BSS3 including AP100C and STA200D is formed
- BSS4 including AP100D and STA200E is formed. Is done.
- the communication range of the wireless communication network in the communication system may overlap with other wireless communication networks.
- BSS overlaps that is, BSS1-BSS4 are mutually OBSS. (Overlap BSS).
- the BSSID is used in the MAC (Media Access Control) layer
- the BSS COLOR information is used in the PHY layer.
- the communication apparatus since the COLOR information is included in the PHY header, the communication apparatus does not need to receive the subsequent PHY header if the COLOR information of the own BSS is not included. As a result, power consumption in the communication device is suppressed.
- the communication system uses a PHY header having a wireless communication network identifier including a second level wireless communication network identifier in which a plurality of first level wireless communication network identifiers are specified.
- a wireless communication network identifier including a second level wireless communication network identifier in which a plurality of first level wireless communication network identifiers are specified.
- each of communication apparatuses 100-1 and 200-1 that are one of the components of the communication system for realizing the operation of the communication system will be described in detail.
- the communication apparatuses according to the first to third embodiments are distinguished from each other by adding a number corresponding to the embodiment at the end, such as the communication apparatuses 100-1 to 100-3. .
- FIG. 2 is a block diagram illustrating an example of a schematic functional configuration of the communication device 100-1 (200-1) according to the first embodiment of the present disclosure.
- the communication device 100-1 includes a wireless communication module 101 (201), a wired communication module 102 (202), a device control unit 103 (203), and an information input unit 104 (204). ) And an information output unit 105 (205).
- the wireless communication module 101 (201) performs wireless communication with the AP 100-1 or the STA 200-1. Specifically, the wireless communication module 101 (201) transmits data obtained from the device control unit 103 (203), and provides the received data to the device control unit 103 (203). Details will be described later.
- the wired communication module 102 (202) communicates with an external device via a wired line. Specifically, the wired communication module 102 (202) is connected to the Internet and communicates with an external device via the Internet. For example, the wired communication module 102 (202) transmits data acquired by the wireless communication module 101 (201) through communication to an external device via the Internet.
- the device control unit 103 (203) controls the operation of the communication device 100-1 (200-1) as a whole. Specifically, the device control unit 103 (203) controls communication between the wireless communication module 101 (201) and the wired communication module 102 (202). For example, the device control unit 103 (203) causes the wireless communication module 101 (201) or the wired communication module 102 (202) to transmit data obtained from the information input unit 104 (204). Further, the device control unit 103 (203) causes the information output unit 105 (205) to output data obtained by communication of the wireless communication module 101 (201) or the wired communication module 102 (202).
- the information input unit 104 (204) receives an input from the outside of the communication device 100-1 (200-1). Specifically, the information input unit 104 (204) receives user input or information obtained from a sensor.
- the information input unit 104 (204) is an input device such as a keyboard or a touch panel or a detection device such as a sensor.
- the information output unit 105 (205) outputs data. Specifically, the information output unit 105 (205) outputs data instructed from the device control unit 103 (203).
- the information output unit 105 (205) is a display that outputs an image based on image information, a speaker that outputs audio or music based on audio information, and the like.
- wired communication module 102 (202), the information input unit 104 (204), and the information output unit 105 (205) in the above configuration may not be included in the communication device 100-1 (200-1).
- FIG. 3 is a block diagram illustrating an example of a schematic functional configuration of the wireless communication module 101 (201) according to the first embodiment of the present disclosure.
- the wireless communication module 101 (201) includes a data processing unit 110 (210), a control unit 120 (220), and a wireless communication unit 130 (230) as communication units.
- the data processing unit 110 includes an interface unit 111, a transmission buffer 112, a transmission frame construction unit 113, a reception frame analysis unit 114, and a reception buffer 115.
- the interface unit 111 is an interface connected to other functional components provided in the communication device 100-1 (200-1). Specifically, the interface unit 111 receives data desired to be transmitted from the other functional configuration, for example, the device control unit 103 (203), or provides received data to the device control unit 103 (203). Etc.
- the transmission buffer 112 stores data to be transmitted. Specifically, the transmission buffer 112 stores data obtained by the interface unit 111.
- the transmission frame construction unit 113 generates a frame to be transmitted. Specifically, the transmission frame construction unit 113 generates a frame based on data stored in the transmission buffer 112 or control information set by the control unit 120 (220). For example, the transmission frame construction unit 113 generates a frame (packet) from the data acquired from the transmission buffer 112, and adds a MAC header and an error detection code for media access control (MAC) to the generated frame. And so on.
- MAC media access control
- the received frame analysis unit 114 analyzes the received frame. Specifically, the received frame analysis unit 114 determines the destination of the frame received by the wireless communication unit 130 (230) and acquires data or control information included in the frame. For example, the received frame analysis unit 114 obtains data and the like included in the received frame by performing analysis of the MAC header, detection and correction of a code error, reorder processing, and the like for the received frame.
- the reception buffer 115 stores received data. Specifically, the reception buffer 115 stores data acquired by the reception frame analysis unit 114.
- the control unit 120 (220) includes a processing control unit 121 and a signal control unit 122 as shown in FIG.
- the processing control unit 121 controls the operation of the data processing unit 110 (210). Specifically, the process control unit 121 controls the occurrence of communication. For example, when a communication connection request is generated, the process control unit 121 causes the data processing unit 110 (210) to generate a frame related to a connection process such as an association process or an authentication process or an authentication process.
- the processing control unit 121 controls frame generation based on the data storage status in the transmission buffer 112 or the analysis result of the received frame. For example, when data is stored in the transmission buffer 112, the processing control unit 121 instructs the transmission frame construction unit 113 to generate a data frame in which the data is stored. In addition, when the reception frame analysis unit 114 confirms reception of a frame, the processing control unit 121 instructs the transmission frame construction unit 113 to generate an acknowledgment frame that is a response to the received frame.
- the signal control unit 122 controls the operation of the wireless communication unit 130 (230). Specifically, the signal control unit 122 controls transmission / reception processing of the wireless communication unit 130 (230). For example, the signal control unit 122 causes the wireless communication unit 130 (230) to set parameters for transmission and reception based on instructions from the processing control unit 121.
- control unit 120 manages BSS information such as COLOR information of the own BSS and other BSSs.
- the wireless communication unit 130 includes a transmission processing unit 131, a reception processing unit 132, and an antenna control unit 133.
- the transmission processing unit 131 performs frame transmission processing. Specifically, the transmission processing unit 131 generates a signal to be transmitted based on the frame provided from the transmission frame construction unit 113. More specifically, the transmission processing unit 131 generates a signal related to a frame based on a parameter set by an instruction from the signal control unit 122. For example, the transmission processing unit 131 encodes, interleaves, and modulates the symbol stream by performing encoding, interleaving, and modulation on the frame provided from the data processing unit 110 (210) according to the coding and modulation schemes indicated by the control unit 120 (220). Is generated. Also, the transmission processing unit 131 converts a signal related to the symbol stream obtained by the preceding process into an analog signal, amplifies, filters, and frequency upconverts.
- the transmission processing unit 131 may perform frame multiplexing processing. Specifically, the transmission processing unit 131 performs processing related to frequency division multiplexing or space division multiplexing.
- the reception processing unit 132 performs frame reception processing. Specifically, the reception processing unit 132 performs frame restoration based on a signal provided from the antenna control unit 133. For example, the reception processing unit 132 obtains a symbol stream by performing a process reverse to the signal transmission, such as frequency down-conversion and digital signal conversion, on the signal obtained from the antenna. Further, the reception processing unit 132 acquires a frame by performing demodulation, decoding, and the like on the symbol stream obtained by the preceding process, and the acquired frame is the data processing unit 110 (210) or the control unit 120 (220). To provide.
- reception processing unit 132 may perform processing related to the separation of multiplexed frames. Specifically, the reception processing unit 132 performs processing related to separation of frames that are frequency division multiplexed or space division multiplexed.
- the reception processing unit 132 may estimate the channel gain. Specifically, the reception processing unit 132 calculates complex channel gain information from the preamble part or the training signal part of the signal obtained from the antenna control unit 133. The calculated complex channel gain information is used for frame multiplexing processing, frame separation processing, and the like.
- the antenna control unit 133 transmits and receives signals via at least one antenna. Specifically, the antenna control unit 133 transmits a signal generated by the transmission processing unit 131 through the antenna, and provides the reception processing unit 132 with a signal received through the antenna. Further, the antenna control unit 133 may perform control related to space division multiplexing.
- the transmission / reception process of the PHY header including the PID is performed by the wireless communication unit 130 (230). Details of the processing will be described later.
- the data processing unit 110 (210), the control unit 120 (220), and the wireless communication unit 130 (230) are also simply referred to as the data processing unit 110, the control unit 120, and the wireless communication unit 130.
- communication device 100-1 (200-1) operating as a transmission side (hereinafter also referred to as a transmission device) and communication device 100-1 (200-1) operating as a reception side (hereinafter also referred to as a reception device). Each function will be described separately.
- the transmission device sets a transmission destination of the data. Specifically, the transmission device sets a wireless communication network identifier related to a wireless communication network that is a transmission destination. For example, the transmission apparatus sets a PID for identifying a BSS as a transmission destination in the physical layer.
- the PID includes, for example, BSS COLOR information.
- the transmitting device when there are a plurality of first-level wireless communication networks serving as transmission destinations, the transmitting device is a second-level wireless communication network in which a plurality of first-level wireless communication network identifiers are specified. Use identifiers.
- the transmission device sets a wild card PID that specifies a plurality of PIDs.
- the wild card PID is a PID in which all PIDs are specified (hereinafter also referred to as unspecified wild card PID).
- the control unit 120 when a data transmission request is generated, when the data transmission destination is an unspecified BSS, the control unit 120 specifies a wild card value that specifies all COLOR information (hereinafter also referred to as unspecified wild card COLOR information). .) Is set as COLOR information. In addition, when not distinguishing an unspecified wild card PID and the specific wild card PID mentioned later, it is only called a wild card PID. The same applies to the COLOR information.
- the wild card PID may be a PID in which some PIDs of all PIDs are specified (hereinafter also referred to as a specific wild card PID). It may be provided.
- the transmission device selects the unspecified wild card PID based on the use of the transmitted frame.
- Applications of the frame include, for example, transmission of data or transmission of control commands such as instructions for communication processing or operation processing other than communication processing.
- the unspecified wild card PID is selected based on the attribute of the transmitted frame.
- the frame attributes include the frame type, content, transmission target range, priority, or security level.
- the transmission apparatus sets an unspecified wild card PID corresponding to the attribute of the frame to be transmitted as the PID included in the PHY header.
- the PID is COLOR information
- the specific wild card PID is also referred to as specific wild card COLOR information.
- the unspecified wild card PID may be selected based on the attribute of the transmission destination of the frame to be transmitted.
- the attribute of the transmission destination of the frame includes the BSS to which the communication device belongs, the type, position, or security level of the communication device.
- the transmission device sets an unspecified wildcard PID corresponding to the attribute of the communication device that is the transmission destination of the frame to be transmitted as the PID included in the PHY header.
- the transmission device when there are a plurality of BSSs to which the communication device that is the transmission destination of the frame belongs, is a wild card PID that identifies the plurality of BSSs Is set as the PID of the PHY header. More specifically, when a plurality of communication devices that belong to different BSSs are the transmission destinations of the frame, the control unit 120 uses the wild card COLOR that specifies all or part of the COLOR information of the BSS to which the transmission destination belongs. Information is selected, and the selected wild card COLOR information is used as COLOR information stored in the PHY header.
- the transmission apparatus sets information for further narrowing down the reception target of the frame to be transmitted.
- the control unit 120 sets link direction identification information for a frame to be transmitted.
- the link direction identification information is uplink identification information and downlink identification information.
- the link direction identification information is a set of an uplink indicator and a downlink indicator.
- the control unit 120 sets the uplink indicator to 1 and sets the downlink indicator to 0.
- the control unit 120 sets the downlink indicator to 1 and sets the uplink indicator to 0.
- the link direction identification information is a set of an uplink indicator and a downlink indicator has been described.
- the link direction identification information may be only one of the uplink indicator and the downlink indicator.
- the transmission apparatus transmits a frame having a PHY header having PID.
- the control unit 120 causes the data processing unit 110 to generate a frame based on the data transmission request.
- the control unit 120 causes the wireless communication unit 130 to generate a PHY header of the frame.
- the wireless communication unit 130 transmits the generated PHY header and transmits the frame following the PHY header.
- the PHY header has a PLCP header and is processed in the PHY layer.
- FIG. 4 is a diagram illustrating a configuration example of a frame transmitted by the transmission apparatus according to the present embodiment.
- the frames transmitted by the transmission device are STF (Short Training Field), LTF (Long Training Field), SIG (Signal) -A, D-STF, D-LTF1 to DLTFN, SIG-B.
- fields such as Data.
- the Data field includes fields such as MAC Header, Data Payload, and FCS (Frame Check Sequence).
- the MAC Header field includes fields such as Frame Type, Duration, Address1 to Address3, Sequence Control, Address4, QoS Control, and HT Control. Further, details of the SIG-A field will be described with reference to FIG. 5 and FIG. 5 and 6 are diagrams illustrating a configuration example of signaling information in a PHY header of a frame transmitted by the transmission apparatus according to the present embodiment.
- FIG. 5 shows a configuration example of the SIG-A field when the frame type is a control frame.
- the SIG-A field includes DL (Downlink) Indication in which a downlink indicator is stored, STBC (Space Time Block Coding), UL (Uplink) Indication in which an uplink indicator is stored, and BW ( Bandwidth), Nsts, PID, PARTIAL AID (Association ID), SGI (Short GI), Coding, MCS (Modulation and Coding Set), Smoothing, Aggregation, Length, Response Indication, Doppler, NDP Indication, CRC (Cyclic Redundancy Check) And fields such as Tail.
- the PID field includes a BSS COLOR field.
- FIG. 6 shows a configuration example of the SIG-A field when the frame type is a data frame.
- the SIG-A field includes MU (Multi User) / SU (Single User), STBC, UL Indication where uplink indicators are stored, BW, Nsts, PID, PARTIAL AID, SGI, Coding , MCS, Beam Channel / Smoothing, Aggregation, Length, Response Indication, DL Indication for storing downlink indication, Doppler, CRC and Tail.
- the frame that follows the PHY header may be an aggregation frame.
- the transmission device concatenates data destined for a device belonging to the network related to the normal PID specified from the wild card PID, and transmits the concatenated data as a subsequent PHY header.
- the control unit 120 performs the data processing unit 110.
- the wireless communication unit 130 transmits a frame including the concatenated data payload following the PHY header.
- the unit of data to be linked may be MSDU (MAC Service Data Unit), MPDU (MAC Protocol Data Unit), or another data unit.
- the receiving device receives the PHY header including the PID. Specifically, when the PHY header is received, the wireless communication unit 130 acquires the PID and link direction identification information included in the PHY header. The acquired PID and link direction identification information are provided to the control unit 120.
- the receiving device receives the succeeding PHY header based on the PID included in the PHY header. Specifically, when the PID included in the received PHY header is a normal PID, the receiving device receives the succeeding PHY header depending on whether the own device belongs to the BSS related to the PID. In addition, when the PID included in the received PHY header is a wild card PID, the reception device is a BSS related to a normal PID specified from the wild card PID (hereinafter also referred to as a target BSS). The subsequent PHY header is received depending on whether it belongs.
- the control unit 120 determines to receive the subsequent portion of the PHY header in the frame.
- the receiving device receives the succeeding PHY header according to the link direction identification information in addition to the PID.
- the receiving apparatus receives the succeeding PHY header according to the link direction identification information of the PHY header.
- the control unit 120 indicates that the link direction identification information provided from the wireless communication unit 130 indicates an uplink (that is, the uplink indicator is 1 and the downlink indicator is 0), and the own device is an AP.
- the own BSS is the target BSS, it is determined that the subsequent portion of the PHY header in the frame related to the PHY header is received.
- the control unit 120 determines that the own BSS is the target BSS. When there is, it is determined that the subsequent part of the PHY header is received.
- the receiving device performs subsequent processing according to whether or not the PHY header is subsequently received. Specifically, when it is determined that the reception apparatus receives the subsequent part of the PHY header, the reception apparatus executes a reception process subsequent to the PHY header.
- the control unit 120 causes the wireless communication unit 130 and the data processing unit 110 to receive the PHY header subsequent, for example, MPDU, based on the information included in the subsequent MAC header included in the PHY header.
- the receiving device stops the reception process.
- the control unit 120 does not cause the wireless communication unit 130 to decode the subsequent PHY header.
- the receiving device controls whether or not to execute sleep according to whether or not the PHY header is subsequently received. Specifically, the receiving apparatus controls suspension of communication processing during the subsequent transmission period of the PHY header according to whether or not the PHY header is subsequently received. For example, if it is determined that the subsequent part of the PHY header is not received, the control unit 120 causes the wireless communication unit 130 to stop the communication function until the subsequent reception of the PHY header is completed. Only one of the transmission function and the reception function may be stopped.
- the receiving apparatus controls whether transmission processing is stopped during the subsequent receiving period of the PHY header. Specifically, the receiving apparatus performs setting control of the transmission stop period of the own apparatus for the subsequent transmission period of the PHY header based on the received signal strength of the PHY header according to whether or not the PHY header is subsequently received. .
- the control unit 120 determines that the subsequent part of the PHY header is not received, and the received signal strength (or received electric field strength) of the frame is equal to or greater than a threshold, and the own device is not a sleep-compatible device or sleeps for some reason. If this is difficult, a transmission stop period such as NAV (Network Allocation Vector) is set for the subsequent reception period of the PHY header instead of sleep. In this case, communication interference in the subsequent reception period of the PHY header can be suppressed.
- NAV Network Allocation Vector
- control unit 120 determines that the subsequent part of the PHY header is not received, and does not set the transmission stop period when the received signal strength of the frame is less than the threshold value. Therefore, when a data transmission request is generated in the own device, a frame is transmitted even during the subsequent transmission period of the PHY header. In this case, the utilization efficiency of radio communication resources can be improved.
- the receiving apparatus may control whether to execute sleep based on the received signal strength of the PHY header. For example, when it is determined that the subsequent part of the PHY header is not received and the received signal strength of the frame is equal to or higher than the threshold value, the control unit 120 causes the wireless communication unit 130 to pause the communication process.
- FIG. 7 is a flowchart conceptually showing processing of the transmission apparatus according to this embodiment.
- the transmission apparatus acquires data related to the data transmission request (step S302). Specifically, when data desired to be transmitted is provided, the data processing unit 110 stores the provided data in the transmission buffer 112.
- the transmission device determines whether or not PID can be used (step S303). Specifically, the control unit 120 determines whether to include COLOR information in the PLCP header.
- the transmission device determines whether the transmission is for a plurality of BSSs (step S304). Specifically, when it is determined that the COLOR information is included in the PLCP header, the control unit 120 determines whether there are a plurality of BSSs that are the transmission destinations of the frame.
- the transmission apparatus determines whether the frame is for a specific use (step S305). Specifically, when it is determined that the frame transmission destination is not a plurality of BSSs, the control unit 120 determines whether the frame is for a specific use based on the attribute of the frame or the attribute of the transmission destination of the frame. .
- the transmission device sets a specific wildcard PID (step S306). Specifically, when it is determined that the frame is for a specific use, the control unit 120 sets specific wildcard COLOR information based on the attribute of the frame or the attribute of the transmission destination of the frame.
- step S305 If it is determined in step S305 that the frame is not a special purpose frame, the transmission device sets an unspecified wildcard PID (step S307). Specifically, when it is determined that the frame is not a frame for specific use, the control unit 120 sets unspecified wild card COLOR information.
- step S304 determines whether the transmission is for a specific BSS. Specifically, the control unit 120 determines whether the transmission destination of the frame is the entire other BSS or a communication device belonging to the other BSS.
- the transmitting apparatus sets the PID of the other BSS (step S309). Specifically, when it is determined that the transmission destination of the frame is another BSS, the control unit 120 sets COLOR information of the other BSS.
- the transmission apparatus determines whether the transmission is to the own BSS (step S310). Specifically, when it is determined that the transmission destination of the frame is not another BSS, the control unit 120 determines whether the transmission destination of the frame is the entire own BSS or a communication device belonging to the own BSS.
- the transmitting apparatus sets the PID of the own BSS (step S311). Specifically, when it is determined that the transmission destination of the frame is the own BSS, the control unit 120 sets the COLOR information of the own BSS.
- the transmission device determines whether the transmission is for the AP (step S312). Specifically, the control unit 120 determines whether the transmission destination is a communication device that operates as an AP.
- the transmission device sets uplink identification information (step S313). Specifically, when it is determined that the transmission destination is an AP, the control unit 120 sets the uplink indicator to 1.
- the downlink indicator may be set to 0.
- step S312 determines whether the transmission is to the AP. Specifically, when it is determined that the transmission destination is not an AP, the control unit 120 determines whether the transmission destination is a communication device that operates as an STA.
- the transmission device sets downlink identification information (step S315). Specifically, when it is determined that the transmission destination is the STA, the control unit 120 sets the downlink indicator to 1.
- the uplink indicator may be set to 0.
- the transmission apparatus constructs a PLCP header (step S316). Specifically, the control unit 120 causes the wireless communication unit 130 to construct a PLCP header including the set COLOR information, an uplink indicator, and a downlink indicator.
- the transmission apparatus constructs a PLCP header that does not use the PID (step S317).
- the control unit 120 causes the wireless communication unit 130 to construct a PLCP header in a format that does not include COLOR information.
- the transmission apparatus constructs a frame (step S318). Specifically, the control unit 120 causes the data processing unit 110 to construct a frame including data stored in the transmission buffer 112 as a data payload. The constructed frame is provided to the wireless communication unit 130.
- the transmission device determines whether or not the wireless transmission path can be used (step S319). Specifically, the wireless communication unit 130 determines whether the wireless transmission path is free by using carrier sense or the like.
- the transmission device transmits a frame (step S320). Specifically, when it is determined that the wireless transmission path is free, the wireless communication unit 130 continuously transmits the constructed PLCP header and the provided frame.
- FIG. 8 is a flowchart conceptually showing processing of the receiving apparatus according to this embodiment.
- the receiving device determines whether there is a PID in the PLCP header (step S402). Specifically, when the PLCP header is received, the wireless communication unit 130 determines whether the PLCP header includes COLOR information.
- the receiving apparatus determines whether the PID is a wild card PID (step S403). Specifically, if it is determined that the PLCP header includes COLOR information, the wireless communication unit 130 provides the COLOR information to the control unit 120, and the control unit 120 determines that the provided COLOR information is a wild card COLOR. Determine if it is information.
- the receiving apparatus determines whether the wild card PID indicates subsequent reception of the PHY header (step S404). Specifically, when it is determined that the COLOR information is the wild card COLOR information, the control unit 120 indicates that the own device should receive the succeeding PHY header from the wild card COLOR information. It is determined whether it is wild card COLOR information as COLOR information of level 2.
- step S403 determines whether the PID is the PID of its own BSS (step S405). Specifically, the control unit 120 determines whether the COLOR information that is not the wild card COLOR information is the normal COLOR information as the first level COLOR information of the own BSS.
- step S404 If it is determined in step S404 that the wild card PID indicates subsequent reception of the PHY header, or if it is determined in step S405 that the PID is the PID of the own BSS, the receiving device has a link direction of its own device. It is determined whether the orientation is correct (step S406). Specifically, when the own apparatus is an AP, the control unit 120 determines whether the link direction identification information indicates an uplink, that is, whether the uplink indicator is 1 and the downlink indicator is 0. In addition, when the own apparatus is an STA, the control unit 120 determines whether the link direction identification information indicates a downlink, that is, whether the uplink indicator is 0 and the downlink indicator is 1.
- the receiving device receives the MAC header (step S407). Specifically, when the link direction identification information indicates an uplink when the own apparatus is an AP, or when the link direction identification information indicates a downlink when the own apparatus is an STA, The wireless communication unit 130 and the data processing unit 110 are made to receive the MAC header that follows the PLCP header. Note that if it is determined in step S402 that no PID is included in the PLCP header, the process proceeds to this step.
- the receiving device determines whether the data for the device is included in the frame (step S408). Specifically, the control unit 120 determines whether or not the device itself is included in destination information of the frame included in the received MAC header, for example, address information.
- the receiving device receives the data (step S409). Specifically, when it is determined that the destination is indicated by the MAC header, the control unit 120 causes the wireless communication unit 130 and the data processing unit 110 to receive subsequent data of the MAC header.
- the receiving device sets the NAV (step S410). Specifically, when it is determined that the own device is not included in the destination indicated by the MAC header, the control unit 120 sets the NAV for the period stored in the Duration field of the MAC header.
- step S405 If it is determined in step S405 that the PID is not the PID of the own BSS, or if it is determined in step S406 that the link direction is not directed to the own apparatus, the receiving apparatus stops receiving the frame (step S411). ). Specifically, the control unit 120 causes the wireless communication unit 130 to stop the frame reception process.
- the receiving apparatus determines whether or not the received signal strength is greater than or equal to a threshold value (step S412). Specifically, the wireless communication unit 130 determines whether the received signal strength of the PLCP header is equal to or greater than a threshold value.
- the determination target may be the received signal strength of the MAC header.
- the receiving device sets the NAV (step S413). Specifically, when it is determined that the received signal strength is greater than or equal to the threshold, control unit 120 sets NAV for the period until the end of transmission of the frame or the period stored in the Duration field of the MAC header. Thus, whether or not NAV is set may be controlled regardless of whether or not sleep is controlled. If the received signal strength is less than the threshold value, NAV is not set, and processing for transmission such as back-off counter subtraction is continued.
- the receiving device determines whether sleep is possible (step S414). Specifically, the control unit 120 determines whether the sleep of the communication function is possible. Note that the function of the receiving apparatus may be put to sleep.
- the receiving apparatus sleeps itself during the NAV period (step S415). Specifically, when it is determined that sleep is possible, the control unit 120 causes the wireless communication unit 130 and the data processing unit 110 to pause communication processing of the own device during the set NAV period.
- step S401 determines whether a signal that is not a PLCP header has been received. Specifically, the wireless communication unit 130 determines whether a signal other than the PLCP header has been detected. If it is determined that a signal other than the PLCP header is detected, the process proceeds to step S412. If it is determined that a signal is not detected, the process returns to step S401.
- FIG. 9 is a schematic diagram for explaining an example of communication using an unspecified wildcard PID in the communication system according to the present embodiment.
- FIG. 10 is an unspecified wildcard PID in the communication system according to the present embodiment. It is a frame sequence diagram for demonstrating the example of communication using.
- the transmission device transmits a frame having a PHY header including an unspecified wild card PID as a PID.
- the STA 200-1B includes, as the PID value, the value W indicating the unspecified wildcard PID toward the APs 100-1A, B, D and the STAs 200-1A, C to E. Send header.
- the receiving apparatus that has received the PHY header determines whether or not the receiving apparatus is a reception target based on the unspecified wild card PID included in the PHY header. For example, each receiving device that has received a PHY header from the STA 200-1B determines that its own device is a reception target because the PID included in the PHY header is an unspecified wildcard PID.
- the receiving device receives the succeeding PHY header according to the received signal strength. For example, since the received signal strength of the PHY header is less than the threshold, the STA 200-1D does not receive the succeeding PHY header as illustrated in FIG.
- Other receiving apparatuses receive the subsequent PHY header and acquire data addressed to the own apparatus. For example, as shown in FIG. 10, a frame in which a plurality of data, probe requests, action information, AP data, STA data, and the like are concatenated is received, and AP 100-1A receives the probe request and AP addressed to itself. Get data for. Further, the STA 200-1A acquires only the data for the STA from the received frame.
- the receiving apparatus sets the reception period of the frame as a transmission stop period. For example, a period from the completion of reception of the PHY header indicated by a straight line having a rhombus as an end point as illustrated in FIG. 10 to the completion of subsequent reception of the PHY header is set to the NAV period.
- the receiving device does not set the NAV period, and if a data transmission request is generated during the transmission period of the frame.
- the frame related to the data transmission request may be transmitted.
- FIG. 11 is a schematic diagram for explaining an example of communication using a specific wildcard PID in the communication system according to the present embodiment.
- FIG. 12 uses the specific wildcard PID in the communication system according to the present embodiment. It is the frame sequence figure for demonstrating the example of the communication which was performed.
- the transmission device transmits a PHY header including a specific wildcard PID as a PID.
- the STA 200-1B includes a PHY header including a value W1 indicating a specific wildcard PID as the value of the PID toward the APs 100-1A, B, D and STAs 200-1A, CE. Is transmitted.
- the specific wild card PID is selected based on the attribute of the frame to be transmitted.
- the receiving apparatus that has received the PHY header determines whether or not the receiving apparatus is a reception target based on the specific wildcard PID included in the PHY header. For example, each receiving device that has received the PHY header from the STA 200-1B indicates that the own device should receive the PHY header following from the specific wildcard PID included in the PHY header. It is determined whether each is a specific wild card PID.
- the receiving device receives the succeeding PHY header according to the received signal strength. For example, when the specific wildcard PID indicates that the communication apparatus belonging to the BSS2 having the PID of 2 and the BSS4 having the PID of 4 should receive the subsequent PHY header, as shown in FIG. , AP 100-1 and STA 200-1 belonging to BSS2 and BSS4 with PID 2 or 4 receive the entire frame. Further, other receiving apparatuses that have received signal strength of the PHY header equal to or higher than the threshold, such as 100-1A, stop the subsequent reception of the PHY header and set the NAV. The STA 200-1D whose received signal strength is less than the threshold stops the subsequent reception of the PHY header, but does not set the NAV. Note that the receiving apparatus that sets the NAV may sleep the communication function for a period corresponding to the NAV period.
- the transmission apparatus transmits a frame having a PHY header having a wireless communication network identifier (PID), and the PID includes a plurality of first-level radios. It includes a second level wireless communication network identifier (wildcard PID) in which a communication network identifier (ordinary PID) is specified. Further, the receiving device receives the PHY header having the PID, and receives the succeeding PHY header based on the wild card PID. Therefore, a plurality of BSSs can be addressed using one PID. Therefore, in the prior art, the size of the PHY header increases as the number of BSSs as destinations increases.
- PID wireless communication network identifier
- the size of the PHY header does not depend on the number of BSSs as destinations. Can be suppressed. Therefore, even in communication destined for a plurality of BSSs, it is possible to suppress a decrease in communication efficiency while maintaining the power consumption reduction effect by using the PHY header including the PID.
- the wild card PID includes a second-level wireless communication network identifier (unspecified wild card PID) in which all the normal PIDs are specified. Therefore, a specific BSS or an unspecified BSS can be switched as a frame destination while maintaining the format of the PHY header including the PID.
- the conventional communication apparatus uses a PHY header format that does not include a PID when an unspecified BSS is a destination. For this reason, the communication device is required to support at least two types of formats. On the other hand, according to this configuration, it is sufficient to support one type of format, thereby simplifying processing and configuration. Therefore, the processing load and manufacturing cost of the communication device can be reduced.
- the wild card PID includes a second level wireless communication network identifier (specific wild card PID) in which some of the normal PIDs are specified. For this reason, the reception target can be narrowed down by receiving the succeeding frame of the PHY header only in some of the BSSs. Therefore, waste of power in the receiving apparatus can be suppressed.
- the specific wildcard PID is selected based on the use of the transmitted frame. For this reason, the transmission destination of a frame can be narrowed down to BSS relevant to the use of the frame. Therefore, wasteful power reception can be further suppressed by omitting useless reception processing in the reception apparatus.
- the specific wildcard PID is selected based on the attribute of the transmitted frame. For this reason, by using the attribute of the frame that is closely related to the use of the frame, the destination BSS can be narrowed down to an appropriate BSS as a reception target. Further, by using uniform information such as frame attributes, it is possible to avoid complication of selection processing of a wild card PID.
- the specific wildcard PID is selected based on the attribute of the transmission destination of the frame to be transmitted. For this reason, by using the transmission destination of the frame, which is one of the elements that determine the usage of the frame, the BSS serving as the destination can be narrowed down to an appropriate BSS as a reception target. Further, when a wild card PID to which a BSS to which a transmission destination belongs is selected, the possibility that an inappropriate BSS is included in the PID specified from the wild card PID can be reduced.
- the PHY header has link direction identification information. For this reason, not only the BSS but also the communication device is specified, so that the reception target can be further narrowed down. Therefore, the power consumption of the receiving device can be more effectively suppressed.
- the link direction identification information includes downlink identification information. Therefore, it is possible to determine whether the communication related to the frame is uplink communication or downlink communication. Therefore, it is possible to improve the certainty of avoiding reception of a frame that is not a reception target by determining whether or not a frame can be received depending on whether the device operates as an AP or an STA.
- the link direction identification information may be uplink identification information as described above.
- the transmission device concatenates data destined for the device belonging to the network related to the normal PID specified from the wild card PID, and transmits the concatenated data as a continuation of the PHY header. For this reason, the data addressed to the receiving device belonging to the BSS related to the PID specified from the wild card PID can be transmitted together. Therefore, the number of times of communication addressed to the same BSS is reduced, and it is possible to improve the utilization efficiency of radio communication resources and reduce the power consumption of the receiving apparatus.
- the PID includes information for identifying the BSS in the physical layer. For this reason, the receiving apparatus can determine whether or not reception is possible based on information such as the COLOR information of the existing BSS. Therefore, by using an existing communication format, it is possible to divert existing transmission / reception processing and suppress an increase in the cost of the apparatus.
- the receiving device receives the succeeding PHY header depending on whether the own device belongs to the target wireless communication network (target BSS) related to the normal PID specified from the wild card PID.
- target BSS target wireless communication network
- PID and BSS correspond one-to-one, and when a destination BSS is added, a PID stored in the PHY header is also added.
- the receiving apparatus controls suspension of communication processing during the subsequent transmission period of the PHY header according to whether or not the PHY header is subsequently received.
- the transmission of the own apparatus is also suppressed during the transmission period of the frame not to be received, there is no problem for the own apparatus even if the communication processing is stopped. Therefore, the power consumption of the communication device can be reduced without any demerit.
- the receiving apparatus performs setting control of the transmission stop period of the own apparatus for the subsequent transmission period of the PHY header based on the received signal strength of the PHY header according to whether or not the subsequent of the PHY header is received.
- the receiving apparatus performs setting control of the transmission stop period of the own apparatus for the subsequent transmission period of the PHY header based on the received signal strength of the PHY header according to whether or not the subsequent of the PHY header is received.
- the receiving apparatus when the receiving apparatus belongs to the target BSS, the receiving apparatus receives the succeeding PHY header according to the link direction identification information of the PHY header. For this reason, by receiving only frames whose link direction is directed to the own apparatus, it is possible to reduce the processing load and power consumption for the reception process for frames not addressed to the own apparatus.
- the transmission apparatus sets the direct link identification information about the transmitted frame as the link direction identification information.
- the direct link identification information is two pieces of identification information for identifying direct link communication.
- the direct link identification information is a set of uplink identification information and downlink identification information. More specifically, when the frame to be transmitted is a direct link frame, that is, a frame from the STA to the STA, the control unit 120 sets the uplink indicator to 0 and sets the downlink indicator to 0.
- the transmission apparatus transmits a frame having a PHY header including direct link identification information for identifying direct link communication. Specifically, both the uplink indicator and the downlink indicator are stored in the PHY header. Note that a normal PID or a wild card PID may be stored in the PHY header.
- the transmission device concatenates data destined for the direct link communication adaptation device, and transmits the concatenated data as a subsequent PHY header.
- the control unit 120 causes the data processing unit 110 to generate a data payload related to the plurality of data, and connects the generated data payload.
- the wireless communication unit 130 transmits a frame including the concatenated data payload following the PHY header.
- the plurality of data may be narrowed down to data addressed to communication devices belonging to the BSS related to the normal PID specified from the normal PID or the wild card PID.
- the receiving device receives the succeeding PHY header based on two pieces of information identifying the direct link communication included in the PHY header. Specifically, when the direct link communication is identified by the uplink identification information and the downlink identification information, the receiving apparatus follows the PHY header based on whether the own apparatus is an STA that should receive the direct link communication. Receive. For example, the control unit 120 indicates that the direct link identification information provided from the wireless communication unit 130 indicates a direct link (that is, the uplink indicator is 0 and the downlink indicator is 0), and the own device performs direct link communication. If the STA is to receive the PHY header, it is determined that the subsequent PHY header is received.
- the receiving device receives the succeeding PHY header based on whether or not the direct link communication of the own device is applied. For example, when the direct link identification information indicates a direct link and the own apparatus is an STA that should receive direct link communication, the control unit 120 determines whether or not the own apparatus is adapted to direct link communication. When it is determined that the own apparatus is adapted for direct link communication, the control unit 120 determines to receive the succeeding PHY header. Note that, even when the device itself is adapted to direct link communication, the presence or absence of subsequent reception of the PHY header may be determined according to the setting of presence or absence of direct link communication. As a result, it is possible to further narrow down the frames to be received by the device itself, and it is possible to further suppress the waste of power.
- the receiving device receives the succeeding PHY header depending on whether the device belongs to the wireless communication network related to the PID. For example, when the PHY header has a normal PID, the control unit 120 determines whether or not the PHY header is subsequently received depending on whether the normal PID is a PID related to the own BSS. In addition, when the PHY header has a specific wildcard PID, the control unit 120 determines whether or not the PHY header is subsequently received according to whether the PID related to the own BSS is included in the PID specified from the specific wildcard PID. To do. When the PHY header has an unspecified wild card PID, the control unit 120 determines to receive the succeeding PHY header.
- the receiving device may receive the PHY header as a conventional PHY header format. Specifically, when at least one of the two pieces of information that is direct link identification information is not recognized, the receiving apparatus receives the succeeding PHY header. For example, when one or both of the uplink sign and the downlink sign cannot be recognized, the wireless communication unit 130 ignores the unrecognizable information and acquires other information.
- FIG. 13 is a flowchart conceptually showing processing of the transmission apparatus according to this embodiment.
- step S501 When a data transmission request is generated (step S501), the transmission apparatus acquires data related to the data transmission request (step S502).
- the transmission device determines whether or not the link direction identification information can be used (step S503). Specifically, the control unit 120 determines whether a PLCP header including both an uplink indicator and a downlink indicator is available.
- the transmission device determines whether the data communication related to the transmission request is direct link communication (step S504). Specifically, the control unit 120 determines whether the data communication is communication between STAs. For example, whether or not direct link communication is performed is determined based on a data destination or attribute.
- the transmission apparatus sets direct link identification information (step S505). Specifically, when it is determined that the data communication is communication between STAs, the control unit 120 sets the uplink indicator to 0 and sets the downlink indicator to 0.
- the transmission apparatus determines whether the data communication is uplink communication (step S506). Specifically, when it is determined that the data communication is not communication between STAs, the control unit 120 determines whether the data communication is communication from the STA to the AP.
- the transmission device sets uplink identification information (step S507). Specifically, when it is determined that the data communication is communication from the STA to the AP, the control unit 120 sets the uplink indicator to 1 and sets the downlink indicator to 0.
- the transmission apparatus sets downlink identification information (step S508). Specifically, when it is determined that the data communication is not communication from the STA to the AP, the control unit 120 sets the uplink indicator to 0 and sets the downlink indicator to 1.
- the transmission device determines whether the destination of the data related to the transmission request is a device in its own BSS (step S509). Specifically, the control unit 120 determines whether the device serving as the data destination belongs to the same BSS as the BSS to which the own device belongs.
- the transmission device sets the PID of the own BSS (step S510). Specifically, when the device serving as the data destination belongs to the own BSS, the control unit 120 sets the COLOR information related to the own BSS as the COLOR information included in the PHY header.
- the transmission device sets the PID of another BSS (step S511). Specifically, when the device serving as the data destination does not belong to the own BSS, the control unit 120 sets the COLOR information related to the BSS to which the device serving as the data destination belongs as the COLOR information included in the PHY header.
- the transmission apparatus constructs a PLCP header (step S512).
- the transmission apparatus constructs a PLCP header that does not use link direction identification information (step S513).
- the transmission apparatus constructs a frame (step S514) and determines whether or not the wireless transmission path can be used (step S515). If it is determined that the wireless transmission path is available, the transmission apparatus transmits a frame (step S516).
- FIG. 14 is a flowchart conceptually showing processing of the receiving apparatus according to this embodiment.
- the receiving device determines whether the PLCP header includes a PID (step S602). Specifically, when the PLCP is received, the wireless communication unit 130 determines whether COLOR information is included in the PLCP header.
- the receiving apparatus acquires the PID (step S603). Specifically, when the PLCP header includes COLOR information, the wireless communication unit 130 provides the COLOR information to the control unit 120.
- the receiving apparatus determines whether the acquired PID is the PID of its own BSS (step S604). Specifically, the control unit 120 determines whether the COLOR information provided from the wireless communication unit 130 matches the normal COLOR information as the first level related to the own BSS. When the COLOR information is the wild card COLOR information as the second level COLOR information, the control unit 120 indicates that the wild card COLOR information should receive the succeeding PHY header. It may be determined whether the wild card COLOR information is.
- the receiving apparatus acquires link direction identification information (step S605). Specifically, the control unit 120 acquires an uplink indicator and a downlink indicator acquired from the PLCP header from the wireless communication unit 130.
- the receiving apparatus determines whether the communication related to the PLCP header is direct link communication based on the link direction identification information (step S606). Specifically, the control unit 120 determines whether the uplink indicator is 0 and the downlink indicator is 0.
- the receiving apparatus determines whether or not the communication is applicable to direct link communication (step S607). Specifically, when it is determined that the uplink indicator is 0 and the downlink indicator is 0, control unit 120 determines whether its own device is adapted for direct link communication. Note that the control unit 120 may determine whether the device itself is adapted to direct link communication and is set to allow direct link communication.
- the receiving apparatus determines whether the communication is uplink communication when the own apparatus is an AP (step S608). Specifically, the control unit 120 determines whether the uplink indicator is 1 and the downlink indicator is 0 when the own device is an AP.
- the receiving device determines whether the communication is downlink communication when the own device is an STA (step S609). Specifically, the control unit 120 determines whether the uplink indicator is 0 and the downlink indicator is 1 when the own apparatus is an STA.
- step S607 If it is determined in step S607 that the own device is adapted for direct link communication, if it is determined in step S608 that the own device is an AP and communication is uplink communication, or if it is determined in step S609 If it is determined that the device is a STA and the communication is a downlink communication, the receiving device receives the MAC header (step S610). In addition, also when it determines with PID not being included in step S602, a process is advanced to step S610.
- the receiving device determines whether the data for the device is included in the frame (step S611). When it is determined that the data for the own device is included, the receiving device receives the data (step S612). When it is determined that the data for the own device is not included, the receiving device sets the NAV (step S613). ).
- step S604 If it is determined in step S604 that the acquired PID is not the PID of its own BSS, if it is determined in step S607 that it is not suitable for direct link communication, or if its own device is a STA and communication is down in step S609 If it is not determined that the communication is link communication, the receiving apparatus stops receiving the frame (step S614).
- the receiving apparatus determines whether or not the received signal strength is equal to or higher than the threshold value (step S615). If it is determined that the received signal strength is equal to or higher than the threshold value, the NAV is set (step S616).
- the receiving apparatus determines whether sleep is possible (step S617). If it is determined that sleep is possible, the receiving apparatus sleeps during the NAV period (step S618).
- FIG. 15 is a schematic diagram for explaining an example of communication using the direct link identification information in the communication system according to the present embodiment.
- FIG. 16 uses the direct link identification information in the communication system according to the present embodiment. It is the frame sequence figure for demonstrating the example of the communication which was performed.
- the transmission device transmits a PHY header including direct link identification information as link direction identification information.
- the STA 200-2B transmits a PHY header having an uplink indicator of 0 and a downlink indicator of 0 toward the APs 100-2A, B, D and STAs 200-2A, CE.
- the frame having is transmitted.
- the receiving apparatus that has received the PHY header determines whether or not the receiving apparatus is a reception target based on the PID and the direct link identification information included in the PHY header. For example, each receiving apparatus that receives the PHY header from the STA 200-2B determines whether the PID included in the PHY header is a PID related to the own BSS. Also, each receiving apparatus determines whether the own apparatus is an STA and is adapted for direct link communication because both the uplink indicator and the downlink indicator included in the PHY header are 0.
- the receiving device receives the succeeding PHY header based on the determination result of the reception target. For example, since the PID included in the PHY header is 2 and both the uplink indicator and the downlink indicator are 0, only STA200-2C belonging to BSS2 having PID 2 and adapted to direct link communication receives It becomes a target. Accordingly, as shown in FIG. 12, the STA 200-2C receives the succeeding PHY header and acquires data for the direct link communication adaptation apparatus. In addition, other communication apparatuses set NAV in the subsequent transmission period of the PHY header. Note that the receiving apparatus that sets the NAV may sleep the communication function for a period corresponding to the NAV period. The STA 200-2D whose received signal strength of the PHY header is less than the threshold stops the subsequent reception of the PHY header, but does not set the NAV.
- the transmission device transmits a PHY header having two pieces of information for identifying direct link communication.
- the receiving apparatus receives a PHY header having two pieces of information for identifying direct link communication, and receives the succeeding PHY header based on the two pieces of information. For this reason, compared with the past, the size of the information for identification whether communication is direct link communication can be reduced. Therefore, it is possible to suppress an increase in power consumption required for receiving the data portion after the PHY header.
- the above two pieces of information include uplink identification information and downlink identification information. Further, when the direct link communication is identified by the uplink identification information and the downlink identification information, the receiving apparatus receives the succeeding PHY header based on whether the own apparatus is a station. For this reason, by using information that can be included in the PHY header, it is possible to identify whether the direct link communication is performed without adding new information to the PHY header.
- the transmission device concatenates data destined for the direct link communication adaptation device, and transmits the concatenated data as a subsequent PHY header. For this reason, data addressed to STAs capable of direct link communication can be transmitted together. Therefore, the number of times of communication related to the same data addressed to the STA capable of direct link communication is reduced, the use efficiency of the radio communication resource can be improved, and the power consumption of not only the STA to be received but also other receiving apparatuses can be reduced. It becomes.
- the PHY header has a wireless communication network identifier. Further, the receiving device receives the succeeding PHY header depending on whether the own device belongs to the wireless communication network related to the wireless communication network identifier. For this reason, only STAs belonging to a specific BSS among STAs adapted for direct link communication can be targeted for reception. Therefore, it is possible to suppress power consumption other than for STAs belonging to the specific BSS.
- the receiving device receives the succeeding PHY header based on whether or not the direct link communication of the own device is applied. For this reason, STAs that are not adapted for direct link communication can be excluded from reception targets. Therefore, waste of power can be further suppressed by appropriately narrowing down the reception target.
- the receiving device When the receiving device does not recognize at least one of the two pieces of information that is the direct link identification information, the receiving device receives the succeeding PHY header. For this reason, even if the receiving apparatus is not adapted to the format of the PHY header including the PID, the frame can be received. Therefore, the configuration of this embodiment can be applied to a network in which the communication device 100-2 (200-2) and the conventional communication device are mixed.
- the direct link identification information is realized by the uplink identification information and the downlink identification information.
- the other two pieces of information may be used for the direct link identification information.
- the transmission apparatus sets mesh network link identification information about a frame to be transmitted as link direction identification information.
- the mesh network link identification information is two pieces of identification information for identifying mesh network communication.
- the mesh network link identification information is a set of uplink identification information and downlink identification information. More specifically, when the frame to be transmitted is a frame related to mesh network communication, the control unit 120 sets the uplink indicator to 1 and sets the downlink indicator to 1. Note that mesh network communication is communication between all communication devices regardless of AP and STA.
- the transmission device transmits a PHY header including mesh network link identification information for identifying mesh network communication. Specifically, both the uplink indicator and the downlink indicator are stored in the PHY header.
- the transmitting device concatenates data destined for the mesh network communication adapting device, and transmits the concatenated data as a subsequent PHY header. For example, when there are a plurality of data addressed to a communication device adapted to mesh network communication, the control unit 120 causes the data processing unit 110 to generate a data payload related to the plurality of data, and connects the generated data payload. Then, the wireless communication unit 130 transmits a frame including the concatenated data payload following the PHY header.
- the receiving device receives the succeeding PHY header based on two pieces of information identifying the mesh network communication included in the PHY header. Specifically, when the mesh network communication is identified by the uplink identification information and the downlink identification information, the receiving apparatus receives the succeeding PHY header based on whether or not the self apparatus adapts to the mesh network communication. For example, if the mesh network link identification information provided from the wireless communication unit 130 indicates mesh network communication (that is, the uplink indicator is 1 and the downlink indicator is 1), the controller 120 may It is determined that the subsequent is received.
- the receiving device receives the succeeding PHY header based on whether or not the mesh network communication of the own device is applied. For example, when the link direction identification information indicates mesh network communication, the control unit 120 determines whether or not the device itself is adapted to mesh network communication. When it is determined that the own apparatus is adapted to mesh network communication, the control unit 120 determines to receive the succeeding PHY header. Note that even if the device itself is adapted to mesh network communication, the presence or absence of subsequent reception of the PHY header may be determined according to the setting of presence or absence of mesh network communication. As a result, it is possible to further narrow down the frames to be received by the device itself, and it is possible to further suppress the waste of power.
- FIG. 17 is a flowchart conceptually showing processing of the transmission apparatus according to this embodiment.
- step S701 When a data transmission request is generated (step S701), the transmission apparatus acquires data related to the data transmission request (step S702), and determines whether or not link direction identification information can be used (step S703).
- the transmission device determines whether the data communication related to the transmission request is mesh network communication (step S704). Specifically, the control unit 120 determines whether the data communication is mesh network communication based on the data destination or attribute.
- the transmission device sets mesh network link identification information (step S705). Specifically, when it is determined that the data communication is mesh network communication, the control unit 120 sets the uplink indicator to 1, and sets the downlink indicator to 1.
- the transmission apparatus determines whether the data communication is uplink communication (step S706), and determines that the data communication is uplink communication. Then, uplink identification information is set (step S707).
- the transmission apparatus sets downlink identification information (step S708).
- the transmission device may further determine whether the data communication is direct link communication as in the second embodiment, and set the direct link identification information.
- the transmission device determines whether the destination of the data related to the transmission request is a device in its own BSS (step S709), and if it is determined that the destination is a device in its own BSS, A PID is set (step S710). When it is determined that the destination is not a device in the own BSS, the transmission device sets the PID of another BSS (step S711).
- the transmission apparatus constructs a PLCP header (step S712). If it is determined in step S703 that link direction identification information is not used, the transmission apparatus constructs a PLCP header that does not use link direction identification information (step S713).
- the transmission apparatus constructs a frame (step S714) and determines whether or not the wireless transmission path can be used (step S715). If it is determined that the wireless transmission path is available, the transmission apparatus transmits a frame (step S716).
- FIG. 18 is a flowchart conceptually showing processing of the receiving apparatus according to this embodiment.
- the receiving apparatus determines whether or not the PLCP header includes a PID (step S802). When it is determined that the PID is included in the PLCP header, the receiving apparatus acquires the PID. (Step S803).
- the receiving apparatus determines whether or not the acquired PID is the PID of the own BSS (step S804). If it is determined that the acquired PID is the PID of the own BSS, the receiving apparatus acquires link direction identification information (step S805). ).
- the receiving device determines whether the communication related to the PLCP header is mesh network communication based on the link direction identification information (step S806). Specifically, the control unit 120 determines whether the uplink indicator is 1 and the downlink indicator is 1.
- the receiving apparatus determines whether or not the communication apparatus is adapted to mesh network communication (step S807). Specifically, when it is determined that the uplink indicator is 1 and the downlink indicator is 1, the control unit 120 determines whether the own device is adapted to mesh network communication. Note that the control unit 120 may determine whether its own device is adapted to mesh network communication and is set to allow mesh network communication.
- step S806 determines whether the communication is uplink communication when the own apparatus is an AP (step S808).
- the receiving device determines whether the communication is downlink communication when the own device is an STA (step S809).
- step S807 If it is determined in step S807 that the own device is adapted for mesh network communication, if it is determined in step S808 that the own device is an AP and communication is uplink communication, or if the own device is determined in step S809. If it is determined that the device is a STA and the communication is a downlink communication, the receiving device receives the MAC header (step S810). In addition, also when it determines with PID not being included in step S802, a process is advanced to step S810.
- the receiving apparatus determines whether data for the apparatus is included in the frame (step S811). If it is determined that the data for the own device is included, the receiving device receives the data (step S812). If it is determined that the data for the own device is not included, the receiving device sets the NAV (step S813). ).
- step S804 If it is determined in step S804 that the acquired PID is not the PID of the own BSS, if it is determined in step S807 that the acquired PID is not adapted to mesh network communication, or if the own device is a STA and communication is down in step S809 If it is not determined that the communication is link communication, the receiving apparatus stops receiving the frame (step S814).
- the receiving apparatus determines whether or not the received signal strength is greater than or equal to the threshold (step S815), and if it is determined that the received signal strength is greater than or equal to the threshold, the NAV is set (step S816).
- the receiving apparatus determines whether sleep is possible (step S817). If it is determined that sleep is possible, the receiving apparatus sleeps during the NAV period (step S818).
- FIG. 19 is a schematic diagram for explaining an example of communication using mesh network link identification information in the communication system according to the present embodiment.
- FIG. 20 is a mesh network link identification information in the communication system according to the present embodiment. It is a frame sequence diagram for demonstrating the example of communication using.
- the transmission apparatus transmits a PHY header including mesh network link identification information as link direction identification information.
- the STA 200-3B transmits a PHY header with an uplink indicator of 1 and a downlink indicator of 1 toward the APs 100-3A, B, D and STAs 200-3A, CE. Send.
- the receiving apparatus that has received the PHY header determines whether the own apparatus is a reception target based on the PID and the mesh network link identification information included in the PHY header. For example, each receiving apparatus that receives the PHY header from the STA 200-3B determines whether the PID included in the PHY header is a PID related to the own BSS. Also, each receiving apparatus determines whether or not its own apparatus is adapted to mesh network communication because both the uplink indicator and the downlink indicator included in the PHY header are 1.
- the receiving device receives the succeeding PHY header based on the determination result of the reception target. For example, since the PID included in the PHY header is 4 and both the uplink indicator and the downlink indicator are 1, only communication devices that belong to the BSS 4 with the PID of 4 and adapt to mesh network communication are subject to reception. It becomes. Therefore, as shown in FIG. 20, the AP 100-3D and the STA 200-3C receive the PHY header and obtain data for the mesh network communication adaptation device. In addition, other communication apparatuses set NAV in the subsequent transmission period of the PHY header. Note that the receiving apparatus that sets the NAV may sleep the communication function for a period corresponding to the NAV period. Further, the STA 200-3D whose received signal strength of the PHY header is less than the threshold stops the subsequent reception of the PHY header, but does not set the NAV.
- the transmission apparatus transmits a PHY header having two pieces of information for identifying mesh network communication.
- the reception device receives a PHY header having two pieces of information for identifying mesh network communication, and receives the succeeding PHY header based on the two pieces of information. For this reason, the increase in the size of the information for identification whether communication is mesh network communication can be suppressed. Therefore, it is possible to suppress an increase in power consumption required for receiving the data portion after the PHY header.
- the above two pieces of information include uplink identification information and downlink identification information. For this reason, when the mesh network communication is identified by the uplink identification information and the downlink identification information, the receiving apparatus receives the succeeding PHY header based on whether or not the self apparatus adapts to the mesh network communication. To do. Therefore, by using information that can be included in the PHY header, it is possible to identify whether it is mesh network communication without adding new information to the PHY header.
- the transmission device concatenates data destined for the mesh network communication adaptation device, and transmits the concatenated data as a continuation of the PHY header. For this reason, data addressed to communication devices capable of mesh network communication can be transmitted together. Therefore, the number of communications related to the same data destined for the STA capable of mesh network communication is reduced, and the use efficiency of wireless communication resources is improved, and the power consumption of not only the receiving apparatus to be received but also other receiving apparatuses is reduced. It becomes possible.
- the PHY header has a wireless communication network identifier. Further, the receiving device receives the succeeding PHY header depending on whether the own device belongs to the wireless communication network related to the wireless communication network identifier. Therefore, only communication devices belonging to a specific BSS among communication devices adapted for mesh network communication can be targeted for reception. Therefore, it is possible to suppress power consumption by devices other than the communication device belonging to the specific BSS.
- the 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 a car You may implement
- the 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.
- the communication device 200 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these terminals.
- the 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.
- Communication device 100 may be realized as a mobile wireless LAN router.
- the communication device 100 may be a wireless communication module (for example, an integrated circuit module configured by one die) mounted on these devices.
- FIG. 21 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 the ad-hoc mode or the direct link 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. 21 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 electric power to each block of the smartphone 900 shown in FIG. 21 through a power supply line partially shown by a broken line in the drawing.
- the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in the sleep mode.
- the data processing unit 110, the control unit 120, and the wireless communication unit 130 described with reference to FIG. 3 may be implemented in the wireless communication interface 913.
- at least a part of these functions may be implemented in the processor 901 or the auxiliary controller 919.
- the smartphone 900 transmits a PHY header including a wild card PID or receives a subsequent PHY header based on the wild card PID. In this case, it is possible to suppress a decrease in communication efficiency while reducing the power consumption of the smartphone 900 or the communication partner.
- the smartphone 900 transmits a PHY header including direct link identification information or mesh network link identification information, or receives a subsequent PHY header based on the identification information. In this case, it is possible to suppress an increase in power consumption of the smartphone 900 or the communication partner related to reception of a PHY header that can identify direct link communication or mesh network communication.
- 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. 22 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. Further, the wireless communication interface 933 can directly communicate with other devices in the ad-hoc mode or the direct link communication mode such as Wi-Fi Direct.
- the wireless communication interface 933 may typically include a baseband processor, an RF circuit, a power amplifier, and the like.
- the wireless communication interface 933 may be a one-chip module in which a memory that stores a communication control program, a processor that executes the program, and related circuits are integrated.
- the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a proximity wireless communication system, or a cellular communication system.
- the antenna switch 934 switches the connection destination of the antenna 935 among a plurality of circuits included in the wireless communication interface 933.
- the antenna 935 includes a single antenna element or a plurality of antenna elements, and is used for transmission and reception of a radio signal by the radio communication interface 933.
- the car navigation device 920 may include a plurality of antennas without being limited to the example of FIG. In that case, the antenna switch 934 may be omitted from the configuration of the car navigation device 920.
- the battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 22 through a power supply line partially shown by a broken line in the drawing. Further, the battery 938 stores electric power supplied from the vehicle side.
- the data processing unit 110, the control unit 120, and the wireless communication unit 130 described with reference to FIG. 3 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 apparatus 920 transmits a PHY header including a wild card PID, or receives a subsequent PHY header based on the wild card PID. In this case, it is possible to suppress a decrease in communication efficiency while reducing the power consumption of the car navigation device 920 or the communication partner.
- the car navigation device 920 transmits a PHY header including direct link identification information or mesh network link identification information, or receives a subsequent PHY header based on the identification information. In this case, it is possible to suppress an increase in power consumption of the car navigation device 920 or the communication partner related to reception of a PHY header that can identify direct link communication or mesh network communication.
- the wireless communication interface 933 may operate as the communication device 100 described above and provide a wireless connection to a terminal of a user who gets on the vehicle.
- the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle side module 942.
- vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.
- FIG. 23 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 IEEE 802.11a, 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 data processing unit 110, the control unit 120, and the wireless communication unit 130 described with reference to FIG. 3 may be implemented in the wireless communication interface 963.
- at least a part of these functions may be implemented in the controller 951.
- the wireless access point 950 transmits a PHY header that includes a wildcard PID, or receives a successor of the PHY header based on the wildcard PID. In this case, it is possible to suppress a decrease in communication efficiency while reducing the power consumption of the wireless access point 950 or the communication partner.
- the wireless access point 950 transmits a PHY header including direct link identification information or mesh network link identification information, or receives a subsequent PHY header based on the identification information. In this case, it is possible to suppress an increase in power consumption of the wireless access point 950 or the communication partner related to reception of a PHY header that can identify direct link communication or mesh network communication.
- a plurality of BSSs can be addressed using one PID. Therefore, in the prior art, the size of the PHY header increases as the number of BSSs as destinations increases. However, in this embodiment, the size of the PHY header does not depend on the number of BSSs as destinations. Can be suppressed. Therefore, even in communication destined for a plurality of BSSs, it is possible to suppress a decrease in communication efficiency while maintaining the power consumption reduction effect by using the PHY header including the PID.
- the second embodiment of the present disclosure it is possible to reduce the size of information for identifying whether or not the communication is direct link communication, as compared with the conventional case. Accordingly, it is possible to suppress an increase in power consumption for receiving the PHY header.
- the third embodiment of the present disclosure it is possible to suppress an increase in the size of information for identifying whether communication is mesh network communication. Accordingly, it is possible to suppress an increase in power consumption for receiving the PHY header.
- the direct link communication is communication between STAs, but the present technology is not limited to this example.
- direct link communication may be communication between APs.
- the configurations disclosed in the above embodiments may be recombined or combined.
- the communication device 100 (200) may have all the functions according to the first to third embodiments and operate according to the functions.
- a storage medium storing the computer program can also be provided.
- a communication unit that transmits a frame having a PHY (Physical Layer) header having a wireless communication network identifier;
- the wireless communication network identifier includes a second level wireless communication network identifier in which a plurality of first level wireless communication network identifiers are specified.
- the communication device according to (1) wherein the second level wireless communication network identifier includes the second level wireless communication network identifier in which all the first level wireless communication network identifiers are specified. .
- the second level wireless communication network identifier includes the second level wireless communication network identifier in which a part of the first level wireless communication network identifier is specified, (1) or (2) The communication apparatus as described in.
- the second level wireless communication network identifier in which the part of the first level wireless communication network identifier is specified is selected based on a use of a frame to be transmitted. Communication device. (5) The second level wireless communication network identifier in which the part of the first level wireless communication network identifier is specified is selected based on an attribute of the transmitted frame. The communication device according to 4). (6) The second level wireless communication network identifier in which the part of the first level wireless communication network identifier is specified is selected based on a transmission destination attribute of the frame to be transmitted (3 The communication apparatus according to any one of (5) to (5). (7) The communication apparatus according to any one of (1) to (6), wherein the PHY header includes link direction identification information.
- the communication device includes downlink identification information.
- the communication device includes direct link identification information.
- the first-stage communication unit concatenates data destined for a device belonging to the network associated with the first-level radio communication network identifier specified from the second-level radio communication network identifier, and connects the concatenated data to the PHY header. 10.
- the communication device according to any one of (1) to (9), which is transmitted as a continuation of the above.
- the wireless communication network identifier includes information for identifying a BSS (Basic Service Set) in a physical layer.
- a communication unit that receives a PHY (Physical Layer) header having a wireless communication network identifier;
- the wireless communication network identifier includes a second level wireless communication network identifier in which a plurality of first level wireless communication network identifiers are specified;
- the communication unit receives the succeeding PHY header based on the second level wireless communication network identifier.
- the previous period communication unit follows the PHY header according to whether the own apparatus belongs to the target wireless communication network related to the first level wireless communication network identifier specified from the second level wireless communication network identifier.
- the communication device according to (12), which receives the communication device.
- the communication device (14) The communication device according to (12) or (13), wherein the communication unit controls suspension of communication processing during a subsequent transmission period of the PHY header in accordance with presence / absence of subsequent reception of the PHY header.
- the communication unit performs setting control of a transmission stop period of the own apparatus for a subsequent transmission period of the PHY header based on a reception signal strength of the PHY header according to presence / absence of reception of the subsequent of the PHY header.
- the communication device according to any one of 12) to (14).
- (16) The communication device (1), wherein, when the device belongs to the target wireless communication network, the communication unit receives a successor of the PHY header according to link direction identification information of the PHY header.
- the wireless communication network identifier includes a second level wireless communication network identifier in which a plurality of first level wireless communication network identifiers are specified.
- the wireless communication network identifier includes a second level wireless communication network identifier in which a plurality of first level wireless communication network identifiers are specified; Receiving a successor of the PHY header based on the second level wireless communication network identifier by a first term communication unit;
- a communication apparatus comprising a communication unit that transmits a frame having a PHY (Physical Layer) header having two pieces of information for identifying direct link communication.
- a communication apparatus comprising a communication unit that receives the succeeding PHY header based on the two pieces of information.
- the two pieces of information include uplink identification information and downlink identification information, When the direct link communication is identified by the uplink identification information and the downlink identification information, the communication unit receives the successor of the PHY header based on whether the device is a station, (25) The communication apparatus as described in.
- the PHY header has a wireless communication network identifier; The communication according to any one of (25) to (27), wherein the communication unit receives a successor of the PHY header according to whether the own apparatus belongs to a wireless communication network related to the wireless communication network identifier. apparatus.
- a communication method including transmitting a frame having a PHY (Physical Layer) header having two pieces of information for identifying direct link communication by a communication unit. (30) Receiving a PHY (Physical Layer) header having two pieces of information for identifying direct link communication by the communication unit; Receiving a successor of the PHY header based on the two pieces of information; Including a communication method.
- a communication apparatus comprising a communication unit that transmits a frame having a PHY (Physical Layer) header having two pieces of information for identifying mesh network communication.
- the first-term communication unit concatenates data addressed to the mesh network communication adaptation device and transmits the concatenated data as a continuation of the PHY header.
- the PHY header includes a wireless communication network identifier.
- a communication apparatus comprising a communication unit that receives the succeeding PHY header based on the two pieces of information.
- the two pieces of information include uplink identification information and downlink identification information, When the mesh network communication is identified by the uplink identification information and the downlink identification information, the communication unit receives the succeeding PHY header based on presence / absence of adaptation of the own device to the mesh network communication. 35).
- the communication unit receives the succeeding PHY header when at least one of the two pieces of information is not recognized.
- the PHY header has a wireless communication network identifier; The communication according to any one of (35) to (37), wherein the communication unit receives the successor of the PHY header according to whether the own apparatus belongs to a wireless communication network related to the wireless communication network identifier. apparatus.
- a communication method including transmitting a frame having a PHY (Physical Layer) header having two pieces of information for identifying mesh network communication by a communication unit. (40) Receiving a PHY (Physical Layer) header having two pieces of information for identifying mesh network communication by the communication unit; Receiving a successor of the PHY header based on the two pieces of information; Including a communication method.
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Abstract
Description
1.第1の実施形態(ワイルドカードPIDを用いた通信)
1-1.システム構成
1-2.装置の機能構成
1-3.装置の機能詳細
1-4.装置の処理
1-5.動作例
1-6.第1の実施形態のまとめ
2.第2の実施形態(ダイレクトリンク識別情報を用いた通信)
2-1.装置の機能詳細
2-2.装置の処理
2-3.動作例
2-4.第2の実施形態のまとめ
3.第3の実施形態(メッシュネットワークリンク識別情報を用いた通信)
3-1.装置の機能詳細
3-2.装置の処理
3-3.動作例
3-4.第3の実施形態のまとめ
4.応用例
5.むすび
まず、本開示の第1の実施形態について説明する。本実施形態においては、無線通信ネットワーク識別子(以下、PHY識別子またはPIDとも称する。)を含むPHYヘッダが通信され、複数の第1のレベルのPID(以下、通常のPIDとも称する。)が特定される第2のレベルのPID(以下、ワイルドカードPIDとも称する。)を用いた通信が行われる。
図1を参照して、本開示の第1の実施形態に係る通信システムの構成について説明する。図1は、本開示の第1の実施形態に係る通信システムの概略的な構成および各種情報の設定状態の例を示す図である。
以上、本開示の第1の実施形態に係る通信システムの構成について説明した。次に、図2を参照して、本実施形態に係るAP100-1およびSTA200-1(以下、通信装置100-1(200-1)とも称する。)の機能構成について説明する。図2は、本開示の第1の実施形態に係る通信装置100-1(200-1)の概略的な機能構成の例を示すブロック図である。
続いて、図3を参照して、無線通信モジュール101(201)の機能構成について説明する。図3は、本開示の第1の実施形態に係る無線通信モジュール101(201)の概略的な機能構成の例を示すブロック図である。
データ処理部110(210)は、図3に示したように、インタフェース部111、送信バッファ112、送信フレーム構築部113、受信フレーム解析部114および受信バッファ115を備える。
制御部120(220)は、図3に示したように、処理制御部121および信号制御部122を備える。
無線通信部130(230)は、図3に示したように、送信処理部131、受信処理部132およびアンテナ制御部133を備える。
次に、本実施形態に係る通信装置100-1(200-1)の機能詳細について説明する。以下では、送信側として動作する通信装置100-1(200-1)(以下、送信装置とも称する。)および受信側として動作する通信装置100-1(200-1)(以下、受信装置とも称する。)に分けて機能をそれぞれ説明する。
まず、送信装置の機能について説明する。
送信装置は、データ送信要求が発生すると、当該データの送信先を設定する。具体的には、送信装置は、送信先となる無線通信ネットワークに係る無線通信ネットワーク識別子を設定する。例えば、送信装置は、送信先となるBSSが物理層で識別されるPIDを設定する。当該PIDとしては、例えばBSSのCOLOR情報がある。
送信装置は、送信されるフレームの受信対象をさらに絞り込むための情報を設定する。具体的には、制御部120は、送信されるフレームについてのリンク方向識別情報を設定する。より具体的には、リンク方向識別情報は、アップリンク識別情報およびダウンリンク識別情報である。例えば、リンク方向識別情報は、アップリンク標識およびダウンリンク標識の組である。
送信装置は、PIDを有するPHYヘッダを有するフレームを送信する。具体的には、制御部120は、データ送信要求に基づいて、フレームをデータ処理部110に生成させる。また、制御部120は、当該フレームのPHYヘッダを無線通信部130に生成させる。そして、無線通信部130は、生成されたフレームがデータ処理部110から提供されると、生成されたPHYヘッダを送信し、当該PHYヘッダに続けてフレームを送信する。なお、PHYヘッダは、PLCPヘッダを有し、PHY層で処理される。
続いて、受信装置の機能について説明する。
受信装置は、PIDを含むPHYヘッダを受信する。具体的には、無線通信部130は、PHYヘッダが受信されると、当該PHYヘッダに含まれるPIDおよびリンク方向識別情報を取得する。取得されたPIDおよびリンク方向識別情報は制御部120に提供される。
受信装置は、PHYヘッダに含まれるPIDに基づいて当該PHYヘッダの後続を受信する。具体的には、受信装置は、受信されたPHYヘッダに含まれるPIDが通常のPIDである場合、当該PIDに係るBSSに自装置が属するかに応じてPHYヘッダの後続を受信する。また、受信装置は、受信されたPHYヘッダに含まれるPIDがワイルドカードPIDである場合、当該ワイルドカードPIDから特定される通常のPIDに係るBSS(以下、対象BSSとも称する。)に自装置が属するかに応じてPHYヘッダの後続を受信する。例えば、無線通信部130から提供されるCOLOR情報が特定ワイルドカードCOLOR情報である場合、当該特定ワイルドカードCOLOR情報から自BSSのCOLOR情報が特定されるときには、自BSSが当該フレームの受信対象となる。また、提供されるCOLOR情報が不特定ワイルドカードCOLOR情報である場合は、全てのBSSが特定されるため、自BSSが当該フレームの受信対象となる。そのため、制御部120は、PHYヘッダを含むフレームのリンク方向が自装置向きであるときには、当該フレームにおけるPHYヘッダの後続部分を受信すると判定する。
受信装置は、PHYヘッダの後続の受信有無に応じて後続処理を実行する。具体的には、受信装置は、当該PHYヘッダの後続を受信すると判定される場合、当該PHYヘッダの後続の受信処理を実行する。例えば、制御部120は、PHYヘッダに含まれる後続のMACヘッダに含まれる情報に基づいて当該PHYヘッダ後続、例えばMPDUを無線通信部130およびデータ処理部110に受信させる。
次に、本実施形態に係る通信装置100-1(200-1)の処理について説明する。
まず、図7を参照して、通信装置100-1(200-1)が送信装置として動作する場合の処理について説明する。図7は、本実施形態に係る送信装置の処理を概念的に示すフローチャートである。
続いて、図8を参照して、通信装置100-1(200-1)が受信装置として動作する場合の処理について説明する。図8は、本実施形態に係る受信装置の処理を概念的に示すフローチャートである。
以上、本実施形態に係る通信装置100-1(200-1)の機能および処理について説明した。次に、図9および図10を参照して、不特定ワイルドカードPIDを用いた通信の例について説明する。図9は、本実施形態に係る通信システムにおける不特定ワイルドカードPIDを用いた通信の例を説明するための模式図であり、図10は、本実施形態に係る通信システムにおける不特定ワイルドカードPIDを用いた通信の例を説明するためのフレームシーケンス図である。
このように、本開示の第1の実施形態によれば、送信装置は、無線通信ネットワーク識別子(PID)を有するPHYヘッダを有するフレームを送信し、当該PIDは、複数の第1のレベルの無線通信ネットワーク識別子(通常のPID)が特定される第2のレベルの無線通信ネットワーク識別子(ワイルドカードPID)を含む。また、受信装置は、PIDを有するPHYヘッダを受信し、当該ワイルドカードPIDに基づいて当該PHYヘッダの後続を受信する。このため、1つのPIDを用いて複数のBSSを宛先とすることができる。従って、先行技術では宛先となるBSSの数が増加するとPHYヘッダのサイズも増大していたが、本実施形態では、PHYヘッダのサイズが宛先となるBSSの数に依存しないため、PHYヘッダのサイズの増大を抑制できる。よって、複数のBSSを宛先とする通信においても、PIDを含むPHYヘッダの利用による消費電力の低減効果を維持したまま、通信効率の低下を抑制することが可能となる。
以上、本開示の第1の実施形態について説明した。次に、本開示の第2の実施形態について説明する。
始めに、本実施形態に係る通信装置100-2(200-2)の機能詳細について説明する。なお、第1の実施形態と同様に、送信装置および受信装置に分けて機能をそれぞれ説明する。
まず、送信装置の機能について説明する。なお、本実施形態では、リンク方向識別情報の設定機能およびPHYヘッダの送信機能において第1の実施形態の機能と差異があるため、これらの機能についてのみ説明する。
送信装置は、送信されるフレームについてのダイレクトリンク識別情報をリンク方向識別情報として設定する。具体的には、ダイレクトリンク識別情報は、ダイレクトリンク通信が識別される2つの識別情報である。例えば、ダイレクトリンク識別情報は、アップリンク識別情報およびダウンリンク識別情報の組である。より詳細には、制御部120は、送信されるフレームがダイレクトリンクフレームすなわちSTAからSTAに向けたフレームである場合、アップリンク標識を0に設定し、ダウンリンク標識を0に設定する。
送信装置は、ダイレクトリンク通信が識別されるダイレクトリンク識別情報を含むPHYヘッダを有するフレームを送信する。具体的には、当該PHYヘッダには、アップリンク標識およびダウンリンク標識の両方が格納される。なお、当該PHYヘッダには、通常のPIDまたはワイルドカードPIDが格納されてもよい。
続いて、受信装置の機能について説明する。なお、本実施形態では、後続処理の判定機能のみ第1の実施形態と異なるため、当該機能についてのみ説明する。
受信装置は、PHYヘッダに含まれるダイレクトリンク通信が識別される2つ情報に基づいて当該PHYヘッダの後続を受信する。具体的には、受信装置は、アップリンク識別情報とダウンリンク識別情報とによってダイレクトリンク通信が識別される場合、自装置がダイレクトリンク通信を受信すべきSTAであるかに基づいてPHYヘッダの後続を受信する。例えば、制御部120は、無線通信部130から提供されたダイレクトリンク識別情報がダイレクトリンクを示し(すなわちアップリンク標識が0であり、かつダウンリンク標識が0である)かつ自装置がダイレクトリンク通信を受信すべきSTAである場合、PHYヘッダの後続を受信すると判定する。
次に、本実施形態に係る通信装置100-2(200-2)の処理について説明する。なお、第1の実施形態における処理と実質的に同一の処理については説明を省略する。
まず、図13を参照して、通信装置100-2(200-2)が送信装置として動作する場合の処理について説明する。図13は、本実施形態に係る送信装置の処理を概念的に示すフローチャートである。
続いて、図14を参照して、通信装置100-2(200-2)が受信装置として動作する場合の処理について説明する。図14は、本実施形態に係る受信装置の処理を概念的に示すフローチャートである。
以上、本実施形態に係る通信装置100-2(200-2)の機能および処理について説明した。次に、図15および図16を参照して、ダイレクトリンク識別情報を用いた通信の例について説明する。図15は、本実施形態に係る通信システムにおけるダイレクトリンク識別情報を用いた通信の例を説明するための模式図であり、図16は、本実施形態に係る通信システムにおけるダイレクトリンク識別情報を用いた通信の例を説明するためのフレームシーケンス図である。
このように、本開示の第2の実施形態によれば、送信装置は、ダイレクトリンク通信が識別される2つの情報を有するPHYヘッダを送信する。また、受信装置は、ダイレクトリンク通信が識別される2つの情報を有するPHYヘッダを受信し、当該2つの情報に基づいてPHYヘッダの後続を受信する。このため、従来と比べて、通信がダイレクトリンク通信であるかどうかの識別のための情報のサイズを低減することができる。従って、PHYヘッダより後のデータ部分の受信にかかる消費電力の増加を抑制することが可能となる。
以上、本開示の第2の実施形態について説明した。次に、本開示の第3の実施形態について説明する。本実施形態においては、第2の実施形態におけるダイレクトリンク識別情報の代わりにまたはそれに加えてメッシュネットワークリンク識別情報を用いた通信が行われる。
始めに、本実施形態に係る通信装置100-3(200-3)の機能詳細について説明する。なお、第2の実施形態と同様に、送信装置および受信装置に分けて機能をそれぞれ説明する。
まず、送信装置の機能について説明する。なお、第2の実施形態の機能との差異についてのみ説明する。
送信装置は、送信されるフレームについてのメッシュネットワークリンク識別情報をリンク方向識別情報として設定する。具体的には、メッシュネットワークリンク識別情報は、メッシュネットワーク通信が識別される2つの識別情報である。例えば、メッシュネットワークリンク識別情報は、アップリンク識別情報およびダウンリンク識別情報の組である。より詳細には、制御部120は、送信されるフレームがメッシュネットワーク通信に係るフレームである場合、アップリンク標識を1に設定し、ダウンリンク標識を1に設定する。なお、メッシュネットワーク通信は、APおよびSTAを問わず全ての通信装置間の通信である。
送信装置は、メッシュネットワーク通信が識別されるメッシュネットワークリンク識別情報を含むPHYヘッダを送信する。具体的には、当該PHYヘッダには、アップリンク標識およびダウンリンク標識の両方が格納される。
続いて、受信装置の機能について説明する。なお、第2の実施形態の機能との差異についてのみ説明する。
受信装置は、PHYヘッダに含まれるメッシュネットワーク通信が識別される2つ情報に基づいて当該PHYヘッダの後続を受信する。具体的には、受信装置は、アップリンク識別情報とダウンリンク識別情報とによってメッシュネットワーク通信が識別される場合、自装置のメッシュネットワーク通信に対する適応有無に基づいてPHYヘッダの後続を受信する。例えば、制御部120は、無線通信部130から提供されたメッシュネットワークリンク識別情報がメッシュネットワーク通信を示す(すなわちアップリンク標識が1であり、かつダウンリンク標識が1である)場合、PHYヘッダの後続を受信すると判定する。
次に、本実施形態に係る通信装置100-3(200-3)の処理について説明する。なお、第1または第2の実施形態における処理と実質的に同一の処理については説明を省略する。
まず、図17を参照して、通信装置100-3(200-3)が送信装置として動作する場合の処理について説明する。図17は、本実施形態に係る送信装置の処理を概念的に示すフローチャートである。
続いて、図18を参照して、通信装置100-3(200-3)が受信装置として動作する場合の処理について説明する。図18は、本実施形態に係る受信装置の処理を概念的に示すフローチャートである。
以上、本実施形態に係る通信装置100-3(200-3)の機能および処理について説明した。次に、図19および図20を参照して、メッシュネットワークリンク識別情報を用いた通信の例について説明する。図19は、本実施形態に係る通信システムにおけるメッシュネットワークリンク識別情報を用いた通信の例を説明するための模式図であり、図20は、本実施形態に係る通信システムにおけるメッシュネットワークリンク識別情報を用いた通信の例を説明するためのフレームシーケンス図である。
このように、本開示の第3の実施形態によれば、送信装置は、メッシュネットワーク通信が識別される2つの情報を有するPHYヘッダを送信する。また、受信装置は、メッシュネットワーク通信が識別される2つの情報を有するPHYヘッダを受信し、当該2つの情報に基づいてPHYヘッダの後続を受信する。このため、通信がメッシュネットワーク通信であるかどうかの識別のための情報のサイズの増加を抑制することができる。従って、PHYヘッダより後のデータ部分の受信にかかる消費電力の増加を抑制することが可能となる。
本開示に係る技術は、様々な製品へ応用可能である。例えば、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、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、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21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22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23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、本開示の第1の実施形態によれば、1つのPIDを用いて複数のBSSを宛先とすることができる。従って、先行技術では宛先となるBSSの数が増加するとPHYヘッダのサイズも増大していたが、本実施形態では、PHYヘッダのサイズが宛先となるBSSの数に依存しないため、PHYヘッダのサイズの増大を抑制できる。よって、複数のBSSを宛先とする通信においても、PIDを含むPHYヘッダの利用による消費電力の低減効果を維持したまま、通信効率の低下を抑制することが可能となる。
(1)
無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを有するフレームを送信する通信部を備え、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含む、通信装置。
(2)
前記第2のレベルの無線通信ネットワーク識別子は、全ての前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子を含む、前記(1)に記載の通信装置。
(3)
前記第2のレベルの無線通信ネットワーク識別子は、一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子を含む、前記(1)または(2)に記載の通信装置。
(4)
前記一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子は、送信されるフレームの用途に基づいて選択される、前記(3)に記載の通信装置。
(5)
前記一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子は、前記送信されるフレームの属性に基づいて選択される、前記(3)または(4)に記載の通信装置。
(6)
前記一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子は、前記送信されるフレームの送信先の属性に基づいて選択される、前記(3)~(5)のいずれか1項に記載の通信装置。
(7)
前記PHYヘッダは、リンク方向識別情報を有する、前記(1)~(6)のいずれか1項に記載の通信装置。
(8)
前記リンク方向識別情報は、ダウンリンク識別情報を含む、前記(7)に記載の通信装置。
(9)
前記リンク方向識別情報は、ダイレクトリンク識別情報を含む、前記(7)または(8)に記載の通信装置。
(10)
前期通信部は、前記第2のレベルの無線通信ネットワーク識別子から特定される前記第1のレベルの無線通信ネットワーク識別子に係るネットワークに属する装置宛てのデータを連結し、連結されたデータを前記PHYヘッダの後続として送信する、前記(1)~(9)のいずれか1項に記載の通信装置。
(11)
前記無線通信ネットワーク識別子は、BSS(Basic Service Set)を物理層で識別するための情報を含む、前記(1)~(10)のいずれか1項に記載の通信装置。
(12)
無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを受信する通信部を備え、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含み、
前記通信部は、前記第2のレベルの無線通信ネットワーク識別子に基づいて前記PHYヘッダの後続を受信する、通信装置。
(13)
前期通信部は、前記第2のレベルの無線通信ネットワーク識別子から特定される前記第1のレベルの無線通信ネットワーク識別子に係る対象無線通信ネットワークに自装置が属するかに応じて前記PHYヘッダの後続を受信する、前記(12)に記載の通信装置。
(14)
前記通信部は、前記PHYヘッダの後続の受信有無に応じて、前記PHYヘッダの後続の送信期間中の通信処理の休止を制御する、前記(12)または(13)に記載の通信装置。
(15)
前記通信部は、前記PHYヘッダの後続を受信有無に応じて、前記PHYヘッダの受信信号強度に基づく前記PHYヘッダの後続の送信期間についての自装置の送信停止期間の設定制御を行う、前記(12)~(14)のいずれか1項に記載の通信装置。
(16)
前記通信部は、前記対象無線通信ネットワークに自装置が属する場合、前記PHYヘッダのリンク方向識別情報に応じて前記PHYヘッダの後続を受信する、前記(13)に記載の通信装置。
(17)
通信部により、無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを有するフレームを送信することを含み、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含む、通信方法。
(18)
通信部により、無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを受信することを含み、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含み、
前期通信部により、前記第2のレベルの無線通信ネットワーク識別子に基づいて前記PHYヘッダの後続を受信することを含む、通信方法。
(21)
ダイレクトリンク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを有するフレームを送信する通信部を備える、通信装置。
(22)
前記2つの情報は、アップリンク識別情報およびダウンリンク識別情報を含む、前記(21)に記載の通信装置。
(23)
前期通信部は、ダイレクトリンク通信適応装置宛てのデータを連結し、連結されたデータを前記PHYヘッダの後続として送信する、前記(21)または(22)に記載の通信装置。
(24)
前記PHYヘッダは、無線通信ネットワーク識別子を有する、前記(21)~(23)のいずれか1項に記載の通信装置。
(25)
ダイレクトリンク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを受信し、
前記2つの情報に基づいて前記PHYヘッダの後続を受信する、通信部を備える、通信装置。
(26)
前記2つの情報は、アップリンク識別情報およびダウンリンク識別情報を含み、
前記通信部は、前記アップリンク識別情報と前記ダウンリンク識別情報とによってダイレクトリンク通信が識別される場合、自装置がステーションであるかに基づいて前記PHYヘッダの後続を受信する、前記(25)に記載の通信装置。
(27)
前記通信部は、自装置のダイレクトリンク通信の適応有無に基づいて前記PHYヘッダの後続を受信する、前記(25)または(26)に記載の通信装置。
(28)
前記PHYヘッダは、無線通信ネットワーク識別子を有し、
前記通信部は、前記無線通信ネットワーク識別子に係る無線通信ネットワークに自装置が属するかに応じて前記PHYヘッダの後続を受信する、前記(25)~(27)のいずれか1項に記載の通信装置。
(29)
通信部により、ダイレクトリンク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを有するフレームを送信することを含む、通信方法。
(30)
通信部により、ダイレクトリンク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを受信することと、
前記2つの情報に基づいて前記PHYヘッダの後続を受信することと、
を含む、通信方法。
(31)
メッシュネットワーク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを有するフレームを送信する通信部を備える、通信装置。
(32)
前記2つの情報は、アップリンク識別情報およびダウンリンク識別情報を含む、前記(31)に記載の通信装置。
(33)
前期通信部は、メッシュネットワーク通信適応装置宛てのデータを連結し、連結されたデータを前記PHYヘッダの後続として送信する、前記(31)または(32)に記載の通信装置。
(34)
前記PHYヘッダは、無線通信ネットワーク識別子を有する、前記(31)~(33)のいずれか1項に記載の通信装置。
(35)
メッシュネットワーク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを受信し、
前記2つの情報に基づいて前記PHYヘッダの後続を受信する、通信部を備える、通信装置。
(36)
前記2つの情報は、アップリンク識別情報およびダウンリンク識別情報を含み、
前記通信部は、前記アップリンク識別情報と前記ダウンリンク識別情報とによってメッシュネットワーク通信が識別される場合、自装置のメッシュネットワーク通信に対する適応有無に基づいて前記PHYヘッダの後続を受信する、前記(35)に記載の通信装置。
(37)
前記通信部は、前記2つの情報のうちの少なくとも一方が認識されない場合、前記PHYヘッダの後続を受信する、前記(35)または(36)に記載の通信装置。
(38)
前記PHYヘッダは、無線通信ネットワーク識別子を有し、
前記通信部は、前記無線通信ネットワーク識別子に係る無線通信ネットワークに自装置が属するかに応じて前記PHYヘッダの後続を受信する、前記(35)~(37)のいずれか1項に記載の通信装置。
(39)
通信部により、メッシュネットワーク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを有するフレームを送信することを含む、通信方法。
(40)
通信部により、メッシュネットワーク通信が識別される2つの情報を有するPHY(Physical Layer)ヘッダを受信することと、
前記2つの情報に基づいて前記PHYヘッダの後続を受信することと、
を含む、通信方法。
200 通信装置、STA
110、210 データ処理部
120、220 制御部
130、230 無線通信部
Claims (18)
- 無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを有するフレームを送信する通信部を備え、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含む、通信装置。 - 前記第2のレベルの無線通信ネットワーク識別子は、全ての前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子を含む、請求項1に記載の通信装置。
- 前記第2のレベルの無線通信ネットワーク識別子は、一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子を含む、請求項1に記載の通信装置。
- 前記一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子は、送信されるフレームの用途に基づいて選択される、請求項3に記載の通信装置。
- 前記一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子は、前記送信されるフレームの属性に基づいて選択される、請求項3に記載の通信装置。
- 前記一部の前記第1のレベルの無線通信ネットワーク識別子が特定される前記第2のレベルの無線通信ネットワーク識別子は、前記送信されるフレームの送信先の属性に基づいて選択される、請求項3に記載の通信装置。
- 前記PHYヘッダは、リンク方向識別情報を有する、請求項1に記載の通信装置。
- 前記リンク方向識別情報は、ダウンリンク識別情報を含む、請求項7に記載の通信装置。
- 前記リンク方向識別情報は、ダイレクトリンク識別情報を含む、請求項7に記載の通信装置。
- 前期通信部は、前記第2のレベルの無線通信ネットワーク識別子から特定される前記第1のレベルの無線通信ネットワーク識別子に係るネットワークに属する装置宛てのデータを連結し、連結されたデータを前記PHYヘッダの後続として送信する、請求項1に記載の通信装置。
- 前記無線通信ネットワーク識別子は、BSS(Basic Service Set)を物理層で識別するための情報を含む、請求項1に記載の通信装置。
- 無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを受信する通信部を備え、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含み、
前記通信部は、前記第2のレベルの無線通信ネットワーク識別子に基づいて前記PHYヘッダの後続を受信する、通信装置。 - 前期通信部は、前記第2のレベルの無線通信ネットワーク識別子から特定される前記第1のレベルの無線通信ネットワーク識別子に係る対象無線通信ネットワークに自装置が属するかに応じて前記PHYヘッダの後続を受信する、請求項12に記載の通信装置。
- 前記通信部は、前記PHYヘッダの後続の受信有無に応じて、前記PHYヘッダの後続の送信期間中の通信処理の休止を制御する、請求項12に記載の通信装置。
- 前記通信部は、前記PHYヘッダの後続を受信有無に応じて、前記PHYヘッダの受信信号強度に基づく前記PHYヘッダの後続の送信期間についての自装置の送信停止期間の設定制御を行う、請求項12に記載の通信装置。
- 前記通信部は、前記対象無線通信ネットワークに自装置が属する場合、前記PHYヘッダのリンク方向識別情報に応じて前記PHYヘッダの後続を受信する、請求項13に記載の通信装置。
- 通信部により、無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを有するフレームを送信することを含み、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含む、通信方法。 - 通信部により、無線通信ネットワーク識別子を有するPHY(Physical Layer)ヘッダを受信することを含み、
前記無線通信ネットワーク識別子は、複数の第1のレベルの無線通信ネットワーク識別子が特定される第2のレベルの無線通信ネットワーク識別子を含み、
前期通信部により、前記第2のレベルの無線通信ネットワーク識別子に基づいて前記PHYヘッダの後続を受信することを含む、通信方法。
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AU2019229436B2 (en) | 2021-08-05 |
AU2019229436A1 (en) | 2019-10-03 |
CN108353274B (zh) | 2021-08-31 |
CN108353274A (zh) | 2018-07-31 |
BR112018009077A2 (pt) | 2018-10-30 |
US20180262906A1 (en) | 2018-09-13 |
EP3376799A4 (en) | 2018-09-19 |
JP7180733B2 (ja) | 2022-11-30 |
EP3376799A1 (en) | 2018-09-19 |
BR112018009077A8 (pt) | 2019-02-26 |
US11356843B2 (en) | 2022-06-07 |
JP2021184648A (ja) | 2021-12-02 |
EP3376799B1 (en) | 2020-09-30 |
JPWO2017081906A1 (ja) | 2018-08-23 |
JP7146398B2 (ja) | 2022-10-04 |
AU2016351750A1 (en) | 2018-04-26 |
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