WO2019167376A1 - Dispositif de communication, procédé de commande et programme - Google Patents

Dispositif de communication, procédé de commande et programme Download PDF

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Publication number
WO2019167376A1
WO2019167376A1 PCT/JP2018/045129 JP2018045129W WO2019167376A1 WO 2019167376 A1 WO2019167376 A1 WO 2019167376A1 JP 2018045129 W JP2018045129 W JP 2018045129W WO 2019167376 A1 WO2019167376 A1 WO 2019167376A1
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Prior art keywords
nfrp
bsrp
information
communication device
amount
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PCT/JP2018/045129
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English (en)
Japanese (ja)
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雅智 大内
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キヤノン株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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 a communication device, a control method, and a program, and specifically relates to an information collection technique in wireless communication.
  • Patent Document 1 describes multi-user transmission in which an access point transmits an activation signal called a trigger frame (TF) based on the IEEE802.11ax standard, and a plurality of terminals transmit frames simultaneously using this TF as a trigger.
  • TF includes resource allocation information regarding resources such as frequencies and subcarriers allocated to each terminal.
  • NDP Null Data Packet
  • BSR Buffer Status Report
  • each of NDP feedback poll and BSR poll the same information can be acquired.
  • the proper use of these two inquiry signals depends on the implementation of each device. That is, both of these two inquiry signals may be transmitted. In such a case, the use efficiency of radio resources deteriorates due to the fact that duplicate signals are transmitted to obtain similar information, and the above-mentioned inquiry signal uses a low-speed modulation method. End up.
  • the present invention provides an efficient technology for acquiring information related to data held by a terminal.
  • a communication apparatus is a communication apparatus that operates in accordance with the IEEE 802.11ax standard, and is a transmission target that is held by one or more other apparatuses corresponding to the IEEE 802.11ax standard based on predetermined conditions.
  • Selection means for selecting whether to use Null Data Packet feedback report poll (NFRP) or Buffer Status Report poll (BSRP) when collecting information related to the amount of data or the amount of requested radio resources, and the selection means Obtaining means for obtaining the information from the one or more other devices by transmitting a Trigger Frame (TF) for the NFRP or the BSRP selected by.
  • NFRP Null Data Packet feedback report poll
  • BSRP Buffer Status Report poll
  • information related to data held by the terminal can be efficiently acquired.
  • FIG. 1 shows a configuration of a wireless communication network 100 according to the present embodiment.
  • the wireless communication network 100 is a wireless LAN including an access point (AP 101) and terminals (STA 102, STA 103) in one example.
  • each of the AP 101, the STA 102, and the STA 103 is a wireless communication device that can communicate according to at least one of the IEEE 802.11 standard series.
  • the AP 101 and the STA 102 correspond to at least the IEEE 802.11ax standard
  • the STA 103 does not correspond to the IEEE 802.11ax standard.
  • the AP 101 and the STA 102 may correspond to other IEEE 802.11 standard series other than the IEEE 802.11ax standard.
  • IEEE is an abbreviation of Institute of Electrical and Electronics Engineers.
  • the English subscript attached to the reference number corresponds to the number of each device.
  • the number of each device is an example, and there can be any number of one or more devices.
  • the AP 101 selects a frame to be transmitted to each STA when collecting information on transmission data held by each STA.
  • the AP 101 determines which frame to use, which is a Buffer Status report feedback pack or an NDP (Null Data Packet) feedback report poll, depending on the situation.
  • Buffer Status Report poll is expressed as BSRP
  • NDP feedback report poll is expressed as NFRP.
  • the AP 101 transmits a frame selected from BSRP and NFRP, and does not transmit a frame not selected. As a result, the AP 101 does not transmit a plurality of separate frames for collecting transmission data information, and can efficiently collect information about data held by the STA.
  • an example of the flow of processing including the configuration of the AP 101 that performs such processing and how the above selection is performed between BSRP and NFRP will be described.
  • FIG. 2 shows a hardware configuration example of the AP 101.
  • the AP 101 includes, for example, a storage unit 201, a control unit 202, a function unit 203, an input unit 204, an output unit 205, and a communication unit 206.
  • the communication unit 206 includes an 802.11ax control unit 207 and a non-802.11ax control unit 208.
  • the storage unit 201 includes, for example, a memory such as a ROM or a RAM, and stores various information such as a program for causing the AP 101 to perform various operations described below and a communication parameter for wireless communication.
  • the storage unit 201 includes, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a DVD, etc., in addition to a memory such as a ROM and a RAM.
  • a storage medium may be included.
  • the storage unit 201 may be configured with a plurality of memories and the like.
  • the control unit 202 is configured by a processor such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit), and controls the entire AP 101 by executing a program stored in the storage unit 201. Note that the control unit 202 may control the AP 101 in cooperation with a program stored in the storage unit 201 and an OS (Operating System).
  • the control unit 202 may be configured by a plurality of processors such as multi-cores.
  • control unit 202 controls the function unit 203 to execute predetermined processes such as an AP function, imaging, printing, and projection.
  • the function unit 203 is hardware for the AP 101 to execute a predetermined process.
  • the function unit 203 may be an imaging unit
  • the function unit 203 may be a recording unit
  • the function unit 203 may be a projection unit.
  • the functional unit 203 may be able to realize not only one function but also a plurality of functions.
  • the input unit 204 accepts 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, sound 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 IEEE802.11 standard series and Wi-Fi (registered trademark) and IP (Internet Protocol) communication. For example, the communication unit 206 switches between the 802.11ax control unit 207 or the non-802.11ax control unit 208 to function, thereby executing either communication corresponding to IEEE802.11ax or communication not corresponding to IEEE802.11ax. can do.
  • the 802.11ax control unit 207 or the non-802.11ax control unit 208 can be a logical unit realized by software using a common communication circuit or the like.
  • the 802.11ax control unit 207 or the non-802.11ax control unit 208 may be a separate physical unit realized by a dedicated communication circuit or the like and corresponding software. Further, the 802.11ax control unit 207 or the non-802.11ax control unit 208 may be configured by some common hardware and other dedicated hardware.
  • the communication unit 206 controls the antenna 209 to transmit and receive a wireless signal for wireless communication.
  • the STA 102 and the STA 103 may have the same configuration as that in FIG. However, some functions may be omitted, for example, the STA 103 may be configured not to include the 802.11ax control unit 207, or a functional configuration not included in FIG. 2 may be added. .
  • TF Trigger Frame: trigger frame
  • the TF indicates information such as a start timing and a radio channel when the STA transmits a signal (frame).
  • a Frame Control field 301 is a field that contains a value indicating that it is an IEEE802.11ax Trigger Frame in this embodiment, and its length is 2 octets.
  • the RA field 303 is a field in which a Receiver Address having a length of 6 octets is stored.
  • the TA field 304 is a field in which Transmitter Address having a length of 6 octets is stored.
  • the Common Info field 305 is a field indicating information common to a plurality of terminals that are destinations of this TF, and the length thereof is 8 octets or more. Details of the common info field 305 will be described later with reference to FIG. 3B.
  • the Per User Info field 306 is a field indicating individual information for the destination of this TF, and its length is 5 octets or more. Since the Per User Info field 306 has different contents for each of BFRP and NFRP, the details thereof will be described later.
  • the padding field 307 is a variable-length padding area for making the length of this TF a multiple of 4 octets.
  • the FCS field 308 stores Frame Check Sequence added for error detection / correction. Detailed description of other fields is omitted.
  • information 310 is a schematic diagram showing details of the common info field 305.
  • the Trigger Type subfield 311 is a subfield having a length of 4 bits, and as shown in the lower left table of FIG. 3B, the trigger type is specified according to the value. As shown in the lower left table of FIG. 3B, the Trigger Type subfield 311 is set to “4” for BSRP TF and “7” for NFRP TF.
  • a TF in which the Trigger Type field is set to “4” is referred to as BSRP TF
  • a TF in which the Trigger Type field is set to “7” is referred to as NFRP TF.
  • the BW (Bandwidth) subfield 315 is a subfield having a length of 2 bits, and as shown in the lower right table of FIG. 3B, the frequency bandwidth to be used is specified according to the value.
  • the Length subfield 312 is a subfield having a length of 12 bits and indicating a response data duration to the TF.
  • the value set in this subfield is reflected in the L-SIG field of the physical layer in the frame of the IEEE 802.11 standard.
  • the L-SIG field includes information indicating the duration of a frame having the field. For example, when the frequency bandwidth used is 20 MHz, the value of the BW subfield 315 is set to 0. Note that description of other subfields is omitted here.
  • the Trigger Dependent Common Info subfield 327 is a subfield whose length is variable (variable length). Additional information corresponding to the Trigger Type subfield 311 is indicated by this subfield. However, in the BSRP TF and NFRP TF, this Trigger Dependent Common Info subfield has no value. Detailed description of the fields other than the above-described fields and subfields is omitted here.
  • the BSRP TF is used to inquire about the buffer status of the STA that has received this TF (the queue size representation of the amount of data remaining in the transmission buffer).
  • the STA transmits an IEEE802.11ax data frame in which information related to the amount of data staying in the transmission queue of the STA is set in a specific field to the AP.
  • Transmission of a data frame including information on the amount of data is BSR.
  • the field in which the information regarding the data amount is set includes a scaling factor and a queue size for each access category.
  • the scaling factor is a unit of the queue size amount, and any one of 16/256/2048/32768 octets is designated.
  • the queue size is a value obtained by dividing the amount of data staying in the transmission queue by a scaling factor.
  • the queue size value is calculated and set for each of four access categories (AC_VO: audio, AC_VI: video, AC_BE: best effort, AC_BK: background). Note that values may not be set for all of the four access categories, and only values for the focused access category may be set. Since the BSR transmitted from the STA is transmitted as a part of the data frame as described above, the AP transmits an acknowledgment (ACK) in response to receiving this data frame.
  • ACK acknowledgment
  • the BSRP TF Per User Info 306 has a configuration as shown in FIG. 4A.
  • the AID subfield 331 is a 12-bit subfield in which the association ID (AID) of the STA that should transmit the BSR is stored.
  • the AID is a numerical value assigned to the STA when the STA transmits an association request to the AP and the AP receives it.
  • the STA is notified of the numerical value of this AID by an Association Response transmitted from the AP as a response signal to the above-mentioned Association Request.
  • the AP manages the AID in association with the STA for each BSS (Basic Service Set).
  • the STA to which the BSR is to be transmitted is specified by the AID subfield 331.
  • the RU Allocation subfield 332 is a field having a length of 8 bits.
  • the RU Allocation subfield 332 specifies the RU to be used for transmission of the data field including the BSR. Description of the other fields is omitted.
  • FIG. 5A is a diagram representing an OFDMA frame in the frequency domain direction when CBW (Channel Band Width) is 20 MHz.
  • CBW Channel Band Width
  • the OFDMA frame includes 242 subcarriers (tones).
  • the CBW can take a value of 40 MHz, 80 MHz, or 160 MHz (80 MHz + 80 MHz).
  • the OFDMA frame includes 484, 996, and 2 ⁇ 996 subcarriers.
  • Each subcarrier constituting the OFDMA frame is assigned a number for specifying the position of the subcarrier on the frequency.
  • the numbers -121 to -1 and 1 to 121 are assigned. Get dumped.
  • the subcarrier with subcarrier number ⁇ 121 is the subcarrier with the lowest frequency
  • the subcarrier with subcarrier number 121 is the subcarrier with the highest frequency.
  • 5B shows a relationship between a resource unit (RU) indicating a subcarrier allocation unit to the STA and the maximum number of RUs that can be allocated.
  • RU resource unit
  • FIG. 5B further shows the number of RUs that can be allocated under the condition that the CBW is 40 MHz, 80 MHz, or 160 MHz.
  • FIG. 5B shows the number of RUs that can be assigned when each RU is configured by the same number of subcarriers, but the number of subcarriers included in each RU may be different. For example, in the 20 MHz band, 8 RUs may be allocated, with 7 RUs for 26 subcarriers and 1 RU for 52 subcarriers.
  • Each STA transmits a data frame including the BSR using the allocated RU. Therefore, the number of Per User Info included in one BSRP TF is equal to or less than the number shown in FIG. 5B.
  • NFRP TF is used by AP to acquire a small amount of information from a large number of STAs.
  • a response to the NFRP TF is transmitted in the form of a Null Data Packet (NDP) without a data part (payload part). That is, the NFRP TF is a TF that designates that information to be collected is transmitted by NDP.
  • NDP Null Data Packet
  • the NFRP TF Per User Info 306 has a configuration as shown in FIG. 4B.
  • the Starting AID subfield 341 is a subfield having a length of 12 bits in which information for designating a STA to transmit information to the AP is stored.
  • a group of STAs having continuous AIDs is designated, and the group of STAs feed back information in response to the NFRP TF.
  • the leading value of this continuous AID range is stored in the Starting AID subfield 341.
  • the STA having the value stored in the Starting AID subfield 341 and the AID within a predetermined range thereafter receives this NFRP TF, feedback in the NDP format is performed.
  • the Feedback Type subfield 344 is a subfield having a length of 4 bits, and when this subfield is set to “0”, it is indicated that this TF is used for Resource Request.
  • a Multiplexing Flag subfield 347 is a field having a length of 1 bit and indicates the number of streams used by the NDP. When the Multiplexing Flag subfield is set to “0”, the number of streams is 1, and when it is set to “1”, the number of streams is 2. Description of the other subfields is omitted.
  • the specified number N is a multiplication value of “constant k”, “value set in the BW field 315 + 1”, and “number of streams indicated by the Multiplexing Flag subfield 347”.
  • the constant k is a value determined by the usage of the OFDMA subcarrier on the NDP radio medium requested by the NFRP TF.
  • k 18.
  • the STA that has received the NFRP TF transmits information by limiting the subcarriers to be used. That is, a plurality of subcarriers are allocated to one STA, and information is transmitted depending on which subcarrier is used among the plurality of subcarriers. For example, in the NFRP TF, when the Feedback Type field 344 is set to a value corresponding to the Resource Request, the STA transmits information on whether or not the requested resource amount is equal to or greater than the threshold by this method. The relationship between this information and the subcarrier used is shown in FIG. 5C. In FIG. 5C, “index” indicates a row referred to by an STA having “value indicated by“ Starting AID subfield 341 + index ⁇ 1 ”as an AID.
  • Send report when the requested resource amount is lower than the threshold.
  • Send NDP feedback report .
  • the STA uses six of the twelve subcarriers assigned to the own device. Note that twelve subcarriers assigned to each STA do not overlap with subcarriers assigned to other STAs.
  • AP101 can acquire the information for 1 bit which shows whether the resource amount which each STA requires is more than a threshold value by the electric power detected in which subcarrier.
  • the above-mentioned threshold value of the requested resource amount can be set within a range of values that can be expressed by BSR. That is, both the BSRP TF and the NFRP TF can be used to determine whether the buffer amount of the STA is greater than a certain value.
  • FIG. 6 is a diagram illustrating an example of a flow of processing in which the AP 101 determines an information collection method from the STA.
  • the processing in FIG. 6 is realized by the control unit 202 of the AP 101 executing a program stored in the storage unit 201. This process can be executed at an arbitrary timing, such as when a new STA is connected, when a connected STA is disconnected, or at a constant cycle.
  • a method for collecting information such as a terminal transmission buffer retention state and a communication resource request state is determined according to the use case of the AP 101.
  • the amount of data in the buffer of the STA can be specified in detail.
  • the AP 101 acquires BSR from up to nine STAs at a time. can do.
  • the AP 101 can specify whether or not the amount of data in the buffer of the STA is equal to or greater than a predetermined threshold, but in the case of 20 MHz (when one spatial stream is used) Thus, information can be acquired from 18 STAs.
  • the AP 101 selects a method to be used by paying attention to such a difference in characteristics.
  • a detailed buffer state is used in an environment where STAs transmit various data using NFRP.
  • BSRP can be used to obtain the information.
  • the process of FIG. 6 is a process corresponding to such an example.
  • the AP 101 determines whether the own device operates as an AP of an IoT (Internet of Things) sensor system (S601).
  • the determination in S601 is made based on the operation mode setting of the AP user. That is, the AP 101 stores the setting operation by the user accepted by the own device, and determines whether or not the own device is operating as an AP of the IoT sensor system based on the setting operation information. Further, the AP 101 recognizes the STA type and the application service executed by the STA in the connection procedure with the STA, and determines the above-described determination based on the result of determining whether to operate as the AP of the IoT sensor system. May be performed.
  • the AP 101 When the AP 101 is operating as an AP of the IoT sensor system (YES in S601), it determines the NFRP threshold (the threshold of the requested resource amount) (S602), and sets a schedule for periodically executing NFRP. (S603).
  • the size of the data transmitted from each STA indicating whether or not the remaining battery level is a specified value is small enough to fit in a certain range, and a minimum amount of radio resources is allocated. It is assumed that communication is performed by assigning. In this case, whether or not there is transmission target data in each STA is important in radio resource allocation, while the amount of data may not be important.
  • the AP 101 when the AP 101 operates exclusively as an AP of the IoT sensor system, it is assumed that all connected STAs correspond to the IEEE 802.11ax standard and a continuous AID is assigned to each STA. Therefore, the AP 101 selects NFRP as the information collection method to be used when the own device is an AP for the IoT sensor system.
  • the AP 101 when the AP 101 is not operating as an AP of the IoT sensor system (YES in S601), the AP 101 subsequently determines whether or not the own device is operating as an AP in the multimedia communication environment (S604). This determination can be made in the same manner as S601. If the AP 101 determines that the own device is operating as an AP in the multimedia communication environment (YES in S604), the AP 101 sets a schedule for periodically executing BSRP (S605). As described above, when the own device is an AP in a multimedia communication environment, the AP 101 collects information using BSRP that can acquire the buffer amount for each access category (voice, video, best effort, background). .
  • the AP 101 can execute processing such as preferentially allocating radio resource units (RUs) to STAs having audio and video transmission buffers according to the collected information. That is, when considering the information on the amount of transmission target data of two or more types acquired from each STA in the allocation of radio resources, the AP 101 is insufficient for 1-bit information transmission of NFRP. Can be determined to be used. Further, the AP 101 is retained when it is an AP of a system that increases the amount of radio resources to be allocated step by step in accordance with an increase in the amount retained for one type of transmission target data. It is necessary to know in detail the amount of data to be transmitted. Therefore, the AP 101 may decide to use BSRP in this case.
  • RUs radio resource units
  • the AP 101 uses NFRP to acquire information on whether or not each STA holds transmission target data, and then allocates a certain amount of radio resources and stores information about the held data. Detailed information may be transmitted. In this case, since signal transmission after radio resource allocation is performed using a normal data signal transmission / reception protocol, for example, by using a modulation scheme having a large number of modulation multi-values, the AP 101 uses a small amount of radio resources. Detailed information can be acquired efficiently. As described above, the NFRP is used in the system in which the AP 101 uses the TF to check whether each STA holds the transmission target data and allocates a certain amount of radio resources to acquire detailed information. Can be done.
  • the AP 101 determines that the own device is not operating as an AP in the multimedia communication environment (NO in S604), the AP 101 selects the information collection method to be used by the processing in FIG. A schedule to be executed is set (S606).
  • the AP 101 first calculates the number of TF transmissions NUM_BSRP required when executing BSRP, and holds the calculation result (S701).
  • NUM_BSRP bandwidth of the operation channel of the BSS (Basic Service Set) managed by the AP 101
  • the maximum number of STAs (maximum number of RUs) that can be designated as a destination is determined by one BSRP TF. Let this number be R. R indicates the maximum number of STAs that can transmit the BSR by one TF. For this reason, when the number of STAs to which BSR is transmitted is M, it is generally possible to transmit BSR to all M STAs by transmitting TF only ceil (M / N) times. I can say that.
  • ceil (x) is a ceiling function and indicates the smallest integer equal to or greater than x.
  • the AP 101 calculates the number of TF transmissions NUM_NFRP required when executing NFRP, and holds the calculation result (S702).
  • the designation of the NFRP TF destination is performed by designating the AID range as described above. For this reason, NUM_NFRP is specified according to how the AID is assigned to the STA.
  • N a value obtained by dividing the number of continuous AIDs by the above-mentioned prescribed number N (for example, 18) is used as an argument of the above-described ceiling function.
  • N for example, 18
  • NUM_NFRP 2.
  • the NUM_NFRP is specified in consideration of the AID assigned to each STA.
  • the NUM_NFRP is specified except for the AID assigned to the STA that does not support IEEE802.11ax. For example, when consecutive AIDs are assigned to 18 IEEE802.11ax-compliant STAs and one IEEE802.11ax-incompatible STA, only the AID assigned to 18 IEEE802.11ax-compliant STAs Is noticed.
  • NUM_NFRP is 1.
  • the AP 101 determines whether both NUM_BSRP and NUM_NFRP are 1 (S703). When the AP 101 determines that both NUM_BSRP and NUM_NFRP are 1 (YES in S703), the AP 101 calculates the time required when BSRP is used and the time required when NFRP is used (S704, S705). How to calculate these times will be described with reference to FIGS. 8A and 8B.
  • FIG. 8A is a diagram schematically representing the time required for transmitting the BSRP TF once.
  • a time width 801 for transmitting a frame portion common to BSRP TF and NFRP TF and a time width 802 for transmitting Per User Info are required.
  • Per User Info has a configuration as shown in FIG. 4A, and the number of Per User Info varies depending on the number of STAs that are destinations of this TF.
  • FIG. 8A shows a case where the number of destination STAs is j.
  • a response signal (HE TB PPDU) is transmitted from each STA after SIFS (Short Inter Frame Space) having a predetermined time width 805.
  • SIFS Short Inter Frame Space
  • This response signal is a Buffer Status Report (BSR).
  • BSR Buffer Status Report
  • the length of this response signal (time width 803) is specified in the Length field 312 of the BSRP TF transmitted by the AP.
  • the AP can calculate and determine the time width 803 based on the data length of the BSR, the RU Allocation subfield 332, the MCS subfield 334, and the like.
  • the number (j) of BSRs to be transmitted corresponds to the number of STAs that are TF destinations.
  • the AP transmits an ACK with a time width of 804 to the response data after SIFS.
  • This ACK may be transmitted individually to a plurality of terminals, or one frame may be transmitted in common (multicast).
  • the time 800 required for transmitting one BSRP TF is specified as a value obtained by adding a value obtained by multiplying the time width 805 by 2 to the sum of the time width 801 to the time width 804 described above. Is done.
  • FIG. 8B is a diagram schematically representing the time required for transmitting the NFRP TF once.
  • a time width 801 for transmitting a frame portion common to the BSRP TF and the NFRP TF, and a time width 811 for transmitting the Per User Info are required.
  • Per User Info has a configuration as shown in FIG. 4B, and the number of Per User Info is one here.
  • the NDP having the time width 812 is transmitted from each STA after the SIFS having the predetermined time width 805.
  • the NDP at this time is transmitted using only some of the subcarriers corresponding to each STA, depending on whether the requested resource amount is equal to or greater than a threshold value.
  • the AP does not transmit ACK to this NDP.
  • the time 810 required when one NFRP TF is transmitted is calculated as the sum of the time width 801, the time width 811, the time width 805, and the time width 812.
  • the AP 101 calculates the total time (T_ALL_BSRP) required when using the BSRP TF (S704).
  • the total time is the time from when the first BSRP TF is transmitted until the BSR is received from all the STAs that are the destinations of the BSRP TF and the ACK is returned.
  • This total time is obtained by multiplying the time width of one BSRP TF procedure specified as shown in FIG. 8A by the NUM_BSRP specified in S701, and the SIFS time width by (NUM_BSRP-1). It is a value obtained by adding the obtained values.
  • FIG. 9A schematically shows this calculation when NUM_BSRP is 2. In this case, the AP 101 multiplies the time width 800 calculated as shown in FIG.
  • the total time 900 required for using BSRP TF is calculated. It is assumed that the AP 101 can transmit the BSRP TF after the SIFS time width elapses after the wireless medium becomes free.
  • the AP 101 calculates the total time (T_ALL_NFRP) required when using the NFRP TF (S705).
  • the total time is also the time from transmission of the first NFRP TF to reception of NDP from all of the STAs that are the destinations of the NFRP TF.
  • This total time is obtained by multiplying the time width of one NFRP TF procedure specified as shown in FIG. 8B by the NUM_NFRP specified in S702 and the SIFS time width by (NUM_NFRP-1). It is a value obtained by adding the obtained values.
  • FIG. 9B schematically shows this calculation when NUM_NFRP is 5. In this case, the AP 101 multiplies the time width 810 calculated as shown in FIG.
  • the SIFS time width 805 inserted four times in total, so that the total required for using the NFRP TF Time 910 is calculated. It is assumed that the AP 101 can transmit the NFRP TF after the SIFS time width elapses after the wireless medium becomes free.
  • the AP 101 compares the total time required when using the BSRP TF calculated in S704 (T_ALL_BSRP) with the total time required when using the NFRP TF calculated in S705 (T_ALL_NFRP) (S706).
  • T_ALL_BSRP the total time required when using the BSRP TF calculated in S704
  • T_ALL_NFRP the total time required when using the NFRP TF calculated in S705
  • the AP 101 selects the method with the shorter total time required for processing as the method to be used. That is, when T_ALL_BSRP is shorter than T_ALL_NFRP (YES in S706), the AP 101 determines to use the information collection method by BSRP (S707). On the other hand, when T_ALL_BSRP is equal to or greater than T_ALL_NFRP (NO in S706), the AP 101 determines to use the information collection method based on NFRP (S708).
  • the comparison in S706 may be, for example, a comparison based on the frame length of BSRP TF and NFRP TF when SIFS is converted into a frame length. That is, the comparison of S706 may be performed according to how much radio resources are used by each TF.
  • T_ALL_BSRP T_ALL_NFRP
  • the information collection method by NFRP is selected, but the information collection method by BSRP may be selected.
  • the AP 101 uses the information collection method with the shorter processing time of BSRP and NFRP. decide.
  • the AP 101 determines whether to give priority to the transmission of TF over the communication of other STAs (S709). ). Whether transmission of TF is prioritized over communication of other STAs is performed, for example, depending on whether SIFS is used (can be used) as IFS (interframe interval) of TF. That is, when SIFS is used (use is permitted), it is determined that transmission of TF is prioritized over communication of other STAs. Note that the determination in S709 may be performed based on other criteria, such as whether or not PIFS (PCF (Point Coordination Function), Inter Frame Space) is used (whether it can be used).
  • PCF Point Coordination Function
  • Inter Frame Space Inter Frame Space
  • the determination can be made depending on whether or not signal transmission is possible in preference to the back-off counter control communication after DIFS / AIFS.
  • DIFS distributed Coordination Function
  • IFS Inter Frame Space
  • the AP 101 determines that priority is given to transmission of TF or that priority is allowed (YES in S709), the process proceeds to S704.
  • the AP 101 determines that the transmission of TF is not prioritized or is not allowed to be prioritized (NO in S709), the process proceeds to S710. In this case, the AP 101 transmits a TF by performing contention-based medium access with communication by another STA.
  • FIG. 10A and FIG. 10B schematically show the total time required for processing when BSFP and NFRP are used.
  • FIG. 10A shows an example in which communication 1001 by another STA occurs after the first processing by BSRP TF when BSRP TF is transmitted twice.
  • the AP 101 cannot know in advance the time width of the communication 1001 by another STA.
  • the maximum length of PPDU PLCP (Physical Layer Convergence Protocol) Protocol Data Unit) is set to 5.484 milliseconds. For this reason, there is a case where it is necessary to wait for this time between the first TF transmission and the second TF transmission. In this case, the time width 1000 required for the BSRP procedure may be increased.
  • the AP 101 determines to use a procedure in which the number of TFs to be transmitted is small and the probability that communication by another STA occurs between the TF and another TF is low. That is, the AP 101 compares NUM_BSRP and NUM_NFRP (S710), and if NUM_BSRP ⁇ NUM_NFRP (YES in S710), selects BSRP as the information collection method to be used (S707).
  • the AP 101 selects NFRP as the information collection method to be used (S708).
  • the AP 101 calculates the total times T_ALL_BSRP and T_ALL_NFRP for executing each of BSRP and NFRP when priority is given to TF as in S704 and S705, and collects information to be used based on this.
  • a method may be selected.
  • the AP 101 may compare T_ALL_BSRP + 5.484 ⁇ (NUM_BSRP-1) ⁇ ⁇ with T_ALL_NFRP + 5.484 ⁇ (NUM_NFRP-1) ⁇ ⁇ .
  • ⁇ is a constant of 1 or less, for example.
  • the determination in S710 may be performed.
  • the AP 101 determines an information collection method by the processes as shown in FIGS. 6 and 7, and uses any one of the information collection methods to acquire information about data held by the STA. And AP101 allocates a resource unit with respect to each STA based on the collected information. And AP101 transmits Basic TF which notifies the allocation of the resource unit, and urges the terminal to transmit UL (Up Link) data.
  • UL Up Link
  • the process of FIG. 7 is described as being executed as a part of FIG. 6, but the present invention is not limited to this. That is, the AP 101 may execute the process of FIG. 7 without executing the process of FIG.
  • the AP 101 may collect information by NFRP when used for an IoT sensor system, and may collect information by BSRP for other purposes. That is, the processing of S604 and S606 may not be executed. Further, the AP 101 may determine the information collection method to be used only depending on whether or not the own device is operating in the multimedia communication environment. For example, when the AP 101 determines that the device is operating in the multimedia communication environment, the AP 101 determines to collect information by BSRP, and determines that the device is not operating in the multimedia communication environment. , It may be decided to collect information by NFRP.
  • the AP 101 determines whether to use BSRP or NFRP depending on whether the communication environment satisfies a predetermined condition.
  • this predetermined condition is that the AP 101 is an AP of the IoT sensor system, the AP 101 operates in a multimedia communication environment, and the time required for collecting information when a TF is transmitted in each method is different. It can be shorter than the method.
  • the predetermined conditions are not limited to these.
  • the AP 101 can determine to use NFRP even in a system other than the IoT sensor system configured such that the STA connected to the own apparatus transmits only data in a certain range of sizes.
  • the AP 101 uses the lower limit of the certain range as a threshold value, holds data having a data amount equal to or greater than the threshold value, and recognizes an STA that is ready to transmit data by the NFRP TF. be able to.
  • the AP 101 allocates a certain amount of radio resources capable of transmitting data in the above-mentioned certain range of sizes to STAs having a data amount equal to or greater than the threshold.
  • the AP 101 can collect information indicating whether or not transmission target data is held by using the NFRP TF by setting the above-described threshold value to a minute value. In this case, the AP 101 can allocate a certain amount of radio resources to, for example, an STA that holds transmission target data. In addition, for the STA whose transmission target data is known to be generated periodically, the AP 101 determines whether the allocated resource amount is the first amount depending on whether the transmission target data amount exceeds a certain amount or not. Can be determined.
  • the AP 101 can make an inquiry about the amount of resources held by the STA by the NFRP TF using this fixed amount as a threshold value. As described above, the AP 101 determines whether or not to perform one predetermined process (whether or not to perform resource allocation / resource allocation) depending on whether or not the amount of data held by the STA is greater than or equal to a predetermined value. In some cases, it is determined whether or not to increase the amount. In this case, the AP 101 need only be able to determine whether or not the data amount (or requested resource amount) held by the STA is greater than or equal to a predetermined value, and thus can determine to collect information using the NFRP TF. .
  • the AP 101 can execute detailed resource control based on the detailed information by grasping the details of the data amount held by the STA.
  • the AP 101 can determine to collect information using BSRP.
  • the AP 101 can determine to use BSRP when determining that the own device is operating in a system in which the amount of resources allocated increases as the amount of data held by the STA increases.
  • the BSRP depends on the amount of radio resources used for information collection by BSRP and NFRP and the time length required for information collection. Or NFRP can be determined. That is, since the information indicating whether the data amount is equal to or greater than the predetermined value can be acquired by NFRP or BSRP, the AP 101 uses the one that does not take time to collect information or wastes radio resources. Information can be collected. In this case, for example, the AP 101 can determine the information collection method to be used based on the time required for information collection and the amount of radio resources without executing the processing of FIG.
  • the AP 101 may select whether to use BSRP or NFRP depending on whether or not it is connected to only an STA that complies with the IEEE802.11ax standard.
  • the AP 101 is connected to only STAs that can support IEEE802.11ax standard TF, there is no AID of STAs that do not support IEEE802.11ax standard between these STAs.
  • the AP 101 can collect information from a large number of STAs at a time by NFRP by allocating continuous AIDs to the STAs to be connected, thereby improving information collection efficiency. it can.
  • the AP 101 can determine to use NFRP when connected to only the STA that complies with the IEEE 802.11ax standard. Even in this case, BSRP may be used when executing a process that needs to know in detail the transmission target data amount such as resource allocation according to the data amount. On the other hand, NFRP may be used when processing such as allocating a certain amount of radio resources is performed when transmission target data exists regardless of the data amount. As described above, the AP 101 can determine which of NFRP and BSRP to use according to the type of processing to be executed.
  • an information collection method that is not the information collection method selected when the predetermined condition is satisfied may be selected.
  • the time required for information collection The selection may be made by comparing the lengths. Note that this selection may be performed according to the resource usage, not the length of time when each of BSRP and NFRP is used. For example, in a system that collects information without immediacy, it may be more important to suppress waste of radio resources than to shorten the time required for collecting information. In such a case, the smaller amount of radio resources used in BSRP TF and NFRP TF can be selected. Note that which of the amount of radio resources and the length of time is used as a reference can be determined in advance depending on, for example, user settings for the AP 101 and what service the system using the AP 101 provides.
  • the AP 101 can select which one of BSRP and NFRP to use based on a predetermined condition such as an application in which the own device is used. And AP101 can acquire efficiently the information regarding the data which STA hold
  • the present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
  • a circuit for example, ASIC

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans la présente invention, un dispositif de communication fonctionnant conformément à la norme IEEE 802.11ax sélectionne l'utilisation soit d'une interrogation de rapport de rétroaction de paquet de données nul (NFRP), soit une interrogation de rapport d'état de tampon (BSRP) sur la base de conditions prédéterminées lors de la collecte d'informations concernant les quantités de données détenues par un ou plusieurs autres dispositifs compatibles standard IEEE 802.11ax ou d'informations concernant les quantités de ressources radio demandées, et transmet une trame de déclenchement (TF) pour la NFRP ou la BSRP, quelle que soit la sélection, afin de collecter les informations en provenance du ou des autres dispositifs.
PCT/JP2018/045129 2018-02-28 2018-12-07 Dispositif de communication, procédé de commande et programme WO2019167376A1 (fr)

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WO2022249634A1 (fr) * 2021-05-27 2022-12-01 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ Terminal, station de base et procédé de communication

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