Classifications

• • 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
  • H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L27/00—Modulated-carrier systems
  • H04L27/26—Systems using multi-frequency codes
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
  • H04W16/24—Cell structures
  • H04W16/28—Cell structures using beam steering
• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/0413—MIMO systems
• • 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]

Definitions

• the present invention relates to an apparatus conforming to the IEE E802.11 series standard.
• the IEEE 802.11 series standard is known as a communication standard relating to a wireless LAN (Wir eI e ss Lo c a l A r e a N e t w o r k ). ⁇
• the EEE 802.11 ax standard achieves high peak throughput using MlM technology that communicates using multiple antennas (Patent Document 1). — I nput Mu lti — Abbreviation for utput.
• Patent Document 1 JP 2018 _ 501 33
• a communication apparatus of the present invention has a transmitting means for transmitting a first frame having a P HY preamble and a data field, and the P HY preamble has a L egacy Short Raining Field (L-ST).
• L-ST L egacy Short Raining Field
• F L egacy Long Training F ield
• L— SIG L egacy S ignal F ield
• E HT Extre me ly H igh T hroughput
• E HT S ignal AF ield
• E HT-ST F E HT Short Raining F ield
• E HT-LT F E HT Long T raining F ield
• the EHT-SIG-A includes a field of 4 bits or more indicating the number of S pace-Time Streams, and the data field is transmitted by the number of streams of the Space_Time Streams. Data included.
• a communication device is a receiving means for receiving a frame having a P HY preamble and a data field, a processing means for processing the frame received by the receiving means,
• the P HY preamplifier is L egacy S hortiraining F ield (L— STF), L egacy Long Training F ield (L—LT F), and L egacy S ignal F ield (L— SIG ), E xtre me ly H igh T hroughput (E HT) S igna IAF ield (E HT-S I GA), E HT S hort T raining F ield (E HT-ST F), E HT L ong T raining F ield (E HT-LT F) and in that order, and the above E HT— SIG— A has a field of 4 bits or more that indicates the number of S pace—T i me S tre am. Including the processing means, the number of streams included
• An information processing apparatus is a computer-readable storage medium having a Legacy Short
• T raining F ield (L— LT F), L egacy S igna IF ield (L— SIG), Extre me ly H igh T hroughput (E HT) S ignal AF ield (E HT- SI GA), E HT Short Raining F ield (E HT-ST F) and E HT Long Training F ield (E HT_ LTF) are arranged in this order, and the E HT_S I G_ A is S pace— It has a generation means for generating a frame having a PH preamble including a field of 4 bits or more indicating the number of Time Stream.
• FIG. 4 is a diagram showing a P HY frame structure of an E HT RU P P D U. Embodiments for carrying out the invention.
• Fig. 1 shows an example of a network configuration according to the present embodiment.
• the wireless communication system shown in Fig. 1 is a wireless network composed of a base station 102 and a plurality of stations (hereinafter, STAs) 103, 104, and 105.
• the base station 102 is, for example, an access point (hereinafter, AP) compliant with the IEEE 802.11 series standard.
• AP access point
• the base station 102 is not limited to this, and may be a Group Owner (hereinafter, GO) that complies with the Wi-Fi Direct standard.
• GO Group Owner
• ⁇ EEE is T h Abbreviation for e Institute of Electrical and Electronics.
• the base station 102 constructs the wireless network 101 and transmits a beacon including identification information of the wireless network.
• the dotted line shown as the wireless network 101 in FIG. 1 indicates the range in which the signal transmitted by the base station 102 reaches, and the base station 102 is within the range of the dotted line. Can communicate with.
• the base station 102 may have a relay function.
• the base station 102 When the base station 102 receives the P r o b e R e q u e st signal (search request) from S T A, the base station 102 transmits a P r o b e R e sp p n se signal (search response) including the identification information as a response.
• the identification information of the wireless network is, for example, ServviceSetIdeentifier (hereinafter, SSID).
• the base station 102 communicates with each of the STAs 103 to 105 according to the wireless communication method of the IEE E802.11EHT standard.
• the base station 102 establishes a wireless link with each STA 103 to 105 through a predetermined association process or the like.
• the base station 102 and each STA 103 to 105 have multiple antennas, which enables high throughput data transmission by M0M0 communication. For example, if each of the base stations 102 and 3-8 has 16 antennas, 16 streams (S pace — T i me Stre am) M l M ⁇ communication is possible.
• MIM ⁇ is an abbreviation of Multi-Input Multi- ⁇ utput
• a plurality of antennas included in a single or a plurality of communication devices use the same channel at the same time. This is a technology that improves resource utilization efficiency.
• communication using the M I M0 technology is called M I M ⁇ communication.
• M/M0 communication performed between the base station 102 and one STA is referred to as a single-user MIMO (Single User MIM ⁇ , SUMIM ⁇ hereinafter).
• M M M communication between base station 102 and multiple STAs The communication is called multi-user MI MO (Multi User MI MO, hereinafter MUMI MO).
• FIG. 2 shows a hardware configuration of the base station 102 and each of the STAs 103 to 105 (hereinafter, collectively referred to as a communication device).
• the communication device includes a storage unit 201, a control unit 202, a function unit 203, an input unit 204, an output unit 205, a communication unit 206, and a plurality of antennas 207.
• the storage unit 201 is composed of one or more memories such as ROM and RAM, and stores programs for performing various operations described below and various information such as communication parameters for wireless communication.
• ROM and RAM in addition to memories such as ROM and RAM, flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, CD-Rs, magnetic tapes, non-volatile memory cards, DVDS, etc.
• a medium may be used.
• the storage unit 201 may include a plurality of memories and the like.
• the control unit 202 includes, for example, one or more processors such as a CPU and an MPU, an AS IC (application-specific integrated circuit), a DSP (digital signal processor), an F PGA (field programmable gate array), and the like. ..
• C P U is an acronym for Ce n t r a l P r o c e s s i n g U n i t
• M P U is an acronym for M i c r o P r o c e s i n g U n i t.
• the communication device is controlled by executing the program stored in the storage unit 201.
• control unit 202 may control the communication device in cooperation with the program stored in the storage unit 201 and O S (O p e r a t i n g S y st e m ). Further, the control unit 202 may be composed of a plurality of processors such as a multi-core and may control the communication device.
• control unit 202 controls the functional unit 203 to execute a predetermined function.
• the predetermined function is, for example, an imaging function if the communication device is a camera. Further, for example, if the communication device is a printer, it has a printing function. Further, for example, if the communication device is a projector, it has a projection function.
• the predetermined function is not limited to these, and various functions are conceivable.
• the function unit 203 is the predetermined function. Is hardware for executing.
• the input unit 204 receives various operations from the user.
• the output unit 205 performs various outputs to the user.
• the output by the output unit 205 includes at least one of display on a screen, voice output by a speaker, vibration output, and the like.
• both the input unit 204 and the output unit 205 may be realized by one module like a touch panel.
• the communication unit 206 controls wireless communication conforming to the IEEE 802.11 EHT standard, controlling wireless communication conforming to W i -F i, controlling IP (Internet Protocol) communication, and the like. ..
• the communication unit 206 controls the antenna 207 to send and receive wireless signals for wireless communication.
• the antenna 20 7 has 16 antennas here because it supports 16-stream M/M communication of the IEE E802.11 EHT standard. Note that the number of antennas 20 7 is not limited to 16.
• FIG. 3 shows E H T S U (S i n g l e U s e r) P P DU (P h y s i c a l l a y e r P r o t o c o l D a t a U n i t) as a first example of the frame.
• E HT S U P P D U is a frame used for S U M I M ⁇ communication.
• P hy s i c a l I a y e r is abbreviated as P H Y.
• FIG. 4 shows E H T E R (E x t e n d e d R a n g e) S U (S i n g l e U s e r) P P DU (P h y s i c a I l a y e r P r o t o c o l D at a U n i t).
• EHTERSPUPDU is a frame used when SUM, MMO communication is performed after the communication distance has been extended. These are collectively referred to as E HT P P DU.
• E H T P P D U is a physical layer (P h y s i c a l L a y e r,
• P HY has a preamble and a data field.
• P HY preamble Includes ST F (Short Raining Field), LT F (Long Raining Field), and SIG (Signal Field).
• E HT SU P D U in Fig. 3 is the P P D U used in S U M ⁇ M ⁇ communication.
• a P HY preamble is arranged at the head of the E HT SU P P DU.
• the legacy device is a non-EHT device (a device that does not comply with the EHT standard), that is, one of the IEEE 802.1 1 a/b/g/n/ac/a X standards. It is a compliant device.
• L-ST F is an abbreviation of L e g a c y S h o r t T r a i n i n g F i e I d, and is used for detection of a P H Y frame signal, automatic gain control (AGC: a u t om a t i c g a i n c o n t r o l), timing detection, and the like.
• AGC automatic gain control
• L-LT F 302 is arranged.
• L-LT F is an abbreviation of L e g a c y L o n g T r a i n i n g F i e l d and is used for highly accurate frequency and time synchronization and acquisition of propagation channel information (CS I ).
• CS I propagation channel information
• CSI is an abbreviation for Cha n n n e l S t a t e In f o r m a t i o n.
• L-S G G303 is arranged immediately after the L-LT F 302, the L-S G G303 is arranged.
• L-S I G is an abbreviation for L e g a c y S i g n a l F i e l d, and is used to transmit control information including data transmission rate and P HY frame length information.
• the various legacy fields (L-STF 301, L-LT F 302, and LS I G303) described above are based on IEEE 802.1 1 a/b/g/n/ac. It has the same configuration as the /ax frame. As a result, the legacy device can decode the data in the various legacy fields.
• the EHT-S G-A 305 is arranged immediately after the L-S G G303.
• E HT— SIG— A is an abbreviation of Extre me ly H igh T hroughput (E HT) S ignal AF ie I d, and E HT-S I GA 1 and E HT-S I G-A 2 are It is configured to include in this order.
• EHT-SIG-A1 contains the information shown in Table 1
• EHT-SIG-A2 contains the information shown in Table 2. These pieces of information are used for the reception processing of E HT P P D U.
• R L-S I G304 may be arranged.
• R L-S I G304 is an abbreviation of R e p e a t e d L-S G G, and is a field including the same contents as L-S G G 303.
• the N S T S A n d M i d am b I e P e r i o d i c i t y field consists of 4 bits and is located from B 23 to B 26, which is 23 bits after the first bit of EHT-S I G-A 1.
• D opp I er field When the value of D opp I er field is 0, it indicates that the channel fluctuation is small, and the number of streams from 1 to 16 can be set. Note that here, the value obtained by subtracting 1 from the actual number of streams is stored in this field. That is, for example, when representing one stream, all four bits are set to “0”, and for example, 16 streams. -When representing a frame, all 4 bits are stored as "1".
• 33 numbers may be set to 1 to 16 regardless of the value of D o p p er er field.
• the maximum number of streams that can be shown is 16.
• E H T-S T F is an abbreviation for E x t r e m e l y H i g h T h r o u g h p u t (E H T) S h o r t T r a i n i n g F i e I d, and is used to improve automatic gain control in M I M communication.
• E H T — L T F is an abbreviation of Ex t r e m e l y H i g h T h r o u g h p u t (E H T) L o n g T r a i n i n g F i e l d and is used for channel estimation in communication.
• a data field 308 is arranged immediately after the EHT-LTF 307.
• the extention 309 may be arranged.
• the data field 308 includes data of M_MO communication transmitted by the number of streams indicated by NSTS And Midamble P eri dicity field of EHT-S I GA 1.
• the E HT ER S U P P D U also has the same configuration as the E HT S U P P D U. That is, the L-ST F401, L-LT F402, L-S I G403, E H T-S G G-A405, E HT-ST F406, H E-L T F407, and data field 408 are arranged in this order. Similarly, R L-S I G404 may be arranged between L-S I G403 and E HT-S I G-A405.
• the P a k k e t e x t e n t i o n 409 may be arranged immediately after the data field 408. Also, the information contained in each field is the same as the content contained in each field of EHTSUPPDU, so description will be omitted.
• the control unit 202 of the base station 102 When the base station 102 transmits the EHTPPDU, the control unit 202 of the base station 102 generates the data included in the data field 308 or 408. The generation is realized by the control unit 202 reading and executing the program stored in the storage unit 201 of the base station 102. Then, the control unit 202, the communication unit 206, or the cooperation thereof generates a frame including the data and including the PHY preamble. Then, the communication unit 206 transmits the generated frame via the antenna 207. On the other hand, the communication unit 206 of the STA 103 receives the EHTP PDU having the above frame structure from the base station 102.
• control unit 202 or communication unit 206 of the STA 103 refers to the N STS A nd M id am ble P eriodicity field included in the PHY preamble EHT—S G G A 1 to determine the number of data field streams. recognize. Then, the communication unit 206 of the STA 103 performs processing according to the number of recognized streams, and thus receives data of the M0M0 communication transmitted in 16 streams, for example. Then, the control unit 202 acquires the data obtained by the reception process from the communication unit 206. Based on the data thus obtained,
• the control unit 202 of the STA 103 performs various types of control such as output control (data display and printing).
• the information processing device can also be implemented in an information processing device (for example, a chip) that generates the P HY preamble.
• the information processing device is preferably connectable to a plurality of antennas.
• E HT P P D U frame configuration
• E HT is described as an abbreviation for E x t r e me l y H i g h T h r o u g h p u t, but it may be understood as an abbreviation for E x t r e me H i g hT h r o u g h p u t.
• the NSTSA nd Mid ble P eriodicity field may not be present in the EHT-S G G A of the PHY preamble in the PDU. That is, when the base station 102 transmits the E HT MU PP DU, the EH TS IG-A included in the E HT MU PPDU does not have a field of 4 bits or more indicating the number of streams.
• the PHY preamble of the beacon or the probe response signal transmitted by the base station 102 includes the EHT-S G-A although the legacy field is included. You may not want to get caught.
• the base station 102 determines whether or not EH TS IG-A is arranged according to the signal to be transmitted, and a field of 4 bits or more indicating the number of streams is provided in EH TS IG-A. It is also possible to switch whether or not to arrange.
• the order of arranging the E HT-S I G-A 1 and A 2 subfields is not limited to the example described above, and can be changed as appropriate. Also, some or all of the subfields other than the N S T S A N d M i d am b l e P e r i o d i c i t y field may not be present. In addition, when there is no D ⁇ pp I e field, the NSTSA nd Mid amble P eri ⁇ dicity field may have the same definition as when the value of the D opp I er field is 0.
• the present invention provides a program that implements one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device. Can also be realized by the process of reading and executing the program. It can also be implemented by a circuit that implements one or more functions (for example, AS IC).

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• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Computer Security & Cryptography (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2019
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• 2020
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