WO2016136725A1 - 無線通信システム、無線通信方法、無線lan基地局装置および無線lan端末装置 - Google Patents
無線通信システム、無線通信方法、無線lan基地局装置および無線lan端末装置 Download PDFInfo
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- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
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- H04W24/08—Testing, supervising or monitoring using real traffic
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- H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
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- H04W72/0446—Resources in time domain, e.g. slots or frames
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Definitions
- the present invention relates to a wireless communication system, a wireless communication method, a wireless LAN base station apparatus, and a wireless LAN terminal apparatus in which a plurality of wireless LAN terminal apparatuses simultaneously transmit wireless frames to one wireless LAN base station apparatus.
- the wireless LAN terminal device is abbreviated as STA
- the wireless LAN base station device is abbreviated as AP.
- MU-MIMO Multi-user multiple input multiple output ⁇ ⁇
- MU-MIMO can simultaneously transmit a radio frame from one AP to a plurality of STAs. Furthermore, in order to further increase the efficiency of simultaneous transmission, a technique for performing effective flow pairing by comparing traffic feature amounts has been proposed.
- Non-Patent Document 1 stipulates a procedure for simultaneous transmission and a radio frame exchanged between an AP and a STA for downlink MU-MIMO and the like. Further, a procedure for grouping STA combinations as destinations of radio frames transmitted by MU-MIMO, adding GID (Group ID), and simultaneously transmitting them is also defined.
- Non-Patent Document 2 discloses a group configuration method for performing efficient downlink MU-MIMO from downlink traffic feature values that can be collected by an AP.
- Non-Patent Document 3 proposes a procedure in which an AP transmits a radio frame including information such as a resource schedule immediately before a plurality of STAs start simultaneous transmission, and functions as a trigger for simultaneous transmission.
- IEEE802.11ac "Wireless LAN Medium Access Control (MAC) and Physical (PHY) Layer Specifications," December 2013 Y. Inoue, S. Shinohara, M. Mizoguchi, and M. Morikura, “Flow-Based User Pairing Scheme for Muti-User Transmissions over WLANs,” Proceedings of the 11th IEEE Vehicular Technology Communications AP Ping Tung, Taiwan, Aug. 28-29, 2014. O. Aboul-Magd, “802.11 HEW SG Proposed PAR,” doc .: IEEE 802.11-14 / 0165r1, March 2014 Jinyoung Chun, Wookbong Lee, “Uplink multi-user transmission”, 11-13 / 1388r0, LG Electronics
- Cited Document 4 even if simultaneous transmission in the uplink direction can be performed using a radio frame serving as a trigger transmitted by the AP, the combination of STAs that transmit simultaneously is not necessarily efficient transmission. There is no guarantee. For example, when a plurality of STAs perform simultaneous transmission, the communication quality of each STA is expected to deteriorate compared to the case where a single STA transmits. Therefore, it is desirable that the STA performing simultaneous transmission has sufficiently small characteristic deterioration due to propagation of a radio frame. However, since there is no means for selecting the combination of the STAs, there is a possibility that in actuality, it is more efficient for each STA to transmit independently than a plurality of STAs transmit simultaneously.
- the present invention relates to a radio communication system capable of selecting STAs to be simultaneously transmitted when simultaneously transmitting radio frames from a plurality of STAs to one AP by a multiple access method, and allowing the STAs to simultaneously transmit.
- An object is to provide a wireless communication method, a wireless LAN base station device, and a wireless LAN terminal device.
- a first invention is a wireless communication system in which a single AP and a plurality of STAs are connected and wireless frames are simultaneously transmitted from the plurality of STAs to the AP in a multiple access method.
- the AP transmits from a plurality of STAs simultaneously.
- Terminal information collecting means for collecting terminal information used for selection and simultaneous transmission control, simultaneous transmission determining means for selecting a combination of STAs to be simultaneously transmitted according to the terminal information, and simultaneous transmission to STAs to be simultaneously transmitted
- Trigger transmission means for transmitting a trigger frame including an instruction and information necessary for simultaneous transmission control, and a STA specified by the trigger frame simultaneously transmits a radio frame to the AP.
- a predetermined STA among the plurality of STAs Selection of STAs to be simultaneously transmitted from other STAs and terminal information collection means for collecting terminal information used for simultaneous transmission control, and a request for grasping the occurrence of a QoS (Quality of Service) data frame from the terminal information and requesting simultaneous transmission Simultaneous transmission request means for transmitting a frame to the AP
- the AP is transmitted from a predetermined STA and terminal information collection means for collecting terminal information used for selection and simultaneous transmission control of STAs simultaneously transmitted from a plurality of STAs.
- simultaneous transmission determining means for selecting a combination of STAs to be simultaneously transmitted according to the terminal information by receiving the request frame.
- Trigger transmission means for instructing simultaneous transmission to the STA and transmitting a trigger frame including information necessary for simultaneous transmission control, and the STA designated by the trigger frame simultaneously transmits a radio frame to the AP. is there.
- the AP executes individual CSMA / CA control for each of a radio frame addressed to the STA and a trigger frame addressed to a plurality of STAs simultaneously transmitted.
- the CSMA / CA control parameters that make it easier to obtain the access right when the number of frames waiting for transmission or the amount of data are larger are set, and the radio frame or trigger frame from which the access right is obtained is transmitted by the individual CSMA / CA control.
- Access control means is provided.
- the AP executes common CSMA / CA control for each of the radio frame addressed to the STA and the trigger frames addressed to the plurality of STAs simultaneously transmitted. And an access control means for selecting a radio frame or a trigger frame having a larger number of frames waiting for transmission or a data amount and acquiring and transmitting an access right by the common CSMA / CA control.
- a third invention is a wireless communication method in which one AP and a plurality of STAs are connected, and a plurality of STAs simultaneously transmit radio frames to the AP by a multiple access method.
- the AP transmits from a plurality of STAs simultaneously.
- step 2 of selecting a combination of STAs to be simultaneously transmitted according to the terminal information, and instructing simultaneous transmission to STAs to be simultaneously transmitted and simultaneously Step 3 for transmitting a trigger frame including information necessary for transmission control, and the STA designated by the trigger frame transmits a radio frame to the AP at the same time.
- a fourth invention is a wireless communication method in which one AP and a plurality of STAs are connected, and wireless frames are simultaneously transmitted from the plurality of STAs to the AP by a multiple access method.
- the AP collects terminal information used for selection of STAs to be simultaneously transmitted from a plurality of STAs and simultaneous transmission control, and receives the request frame transmitted from a predetermined STA, thereby changing the terminal information to the terminal information.
- a step 3 for transmitting a trigger frame containing the information necessary control to, STA which is specified by the trigger frame is transmitted simultaneously radio frame to the AP.
- the AP executes individual CSMA / CA control for each of the radio frame addressed to the STA and the trigger frame addressed to the plurality of STAs simultaneously transmitted.
- the CSMA / CA control parameters that make it easier to obtain the access right when the number of frames waiting for transmission or the amount of data are larger are set, and the radio frame or trigger frame from which the access right is obtained is transmitted by the individual CSMA / CA control. .
- the AP when the AP performs common CSMA / CA control for each of the radio frame addressed to the STA and the trigger frames addressed to the plurality of STAs simultaneously transmitted.
- the wireless frame or trigger frame having the larger number of frames waiting for transmission or the amount of data is selected, and the access right is acquired and transmitted by the common CSMA / CA control.
- Terminal information collection means for collecting terminal information used for selection and simultaneous transmission control
- simultaneous transmission determination means for selecting a combination of STAs to be simultaneously transmitted according to the terminal information
- trigger transmission means for transmitting a trigger frame including information necessary for simultaneous transmission control.
- Access control means is provided for setting a CSMA / CA control parameter that allows more access rights to be acquired more often, and transmitting a radio frame or a trigger frame from which access rights have been acquired by the individual CSMA / CA control.
- Access control means is provided for selecting a radio frame or a trigger frame with a larger number and acquiring and transmitting an access right by the common CSMA / CA control.
- the sixth invention is a STA of a wireless communication system in which a single AP and a plurality of STAs are connected, and a plurality of STAs simultaneously transmit radio frames to the AP by a multiple access method, and the STAs simultaneously transmit from the other STAs.
- Information collecting means for collecting terminal information used for selection and simultaneous transmission control, and simultaneous transmission requesting means for grasping the occurrence of a QoS data frame from the terminal information and transmitting a request frame for requesting simultaneous transmission to the AP .
- the present invention is selected as a STA to be simultaneously transmitted when a QoS data frame is generated by the STA, and a plurality of STAs notified by the trigger frame can start simultaneous transmission by a multiple access method at an appropriate timing. Furthermore, according to the present invention, the throughput of simultaneous transmission can be improved by selecting a combination of STAs having good data transmission efficiency for simultaneous transmission.
- FIG. 1 shows a configuration example of a wireless communication system of the present invention.
- one AP and a plurality of STA1 to STAn are connected.
- a solid line indicates that radio frames can be transmitted and received between the AP and the STA1 to STAn.
- a broken line indicates that STA1 can receive radio frames transmitted by STA2 and STA3.
- FIG. 2 shows a configuration example of APs and STAs in the wireless communication system of the present invention.
- the AP and the STA include a radio communication unit 11 that performs multiple access processing in radio frame transmission / reception and simultaneous transmission, a control unit 12 that performs general control including radio frame transmission / reception control, and information necessary for each control.
- the transmission control unit 15 includes a simultaneous transmission determination unit 14 that generates a trigger frame for notifying information, and an access control unit 15 that acquires the access right of the radio frame by CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) control.
- the radio frame includes control signals such as a downlink data frame transmitted by the AP, an uplink data frame transmitted by the STA, terminal information used for simultaneous transmission control of the STA, a notification frame, a request frame, and a trigger frame.
- FIG. 3 shows a control sequence of the first embodiment in the wireless communication system of the present invention.
- FIG. 7 shows steps S11 to S15 as the simultaneous transmission control procedure of the first embodiment in the wireless communication system of the present invention.
- the AP collects and aggregates terminal information necessary for selection of STAs to be simultaneously transmitted from STA1 to STAn and simultaneous transmission control.
- the terminal information is traffic characteristic information at each STA and propagation characteristic information such as received power from each STA and channel state.
- each STA for example, the presence / absence and number of transmission packets with a high priority access category, the bit size, whether or not there is a packet exceeding the threshold in the transmission queue, the application type of the transmission packet, and generated in the STA Information on the generation rate of user data, the frequency of occurrence of user data, the presence / absence of transmission packets that occur periodically, and the like.
- the STA determines the NAV period length when the AP sets the NAV (Network Allocation Vector) that is a packet transmission prohibition period by including information on the packet length of the uplink data frame and the bit amount of the packet in the terminal information. Can be made.
- NAV Network Allocation Vector
- the AP can collect statistical values of STA uplink traffic, predict the presence / absence of regularly generated uplink traffic, and use it for selecting STAs to be transmitted simultaneously.
- the communication quality of each STA is expected to deteriorate compared to when transmitting STAs alone. Therefore, characteristic deterioration due to radio frame propagation when performing simultaneous transmission. It is desirable to combine STAs with sufficiently small STAs. In order to determine this propagation characteristic, the result of predicting the propagation channel quality with the AP from the received power value of the frame transmitted by the STA, and the characteristic comparison between the plurality of STAs are the same when performing simultaneous transmission.
- the terminal information indicating whether or not there is a STA having the received power value can also be used for simultaneous transmission determination.
- each STA periodically or voluntarily transmits a frame including terminal information, or sequentially responds to each STA according to AP polling, or from each STA. It is possible to put the terminal information on the uplink data frame or the terminal information on the ACK as a response frame to the downlink data frame.
- the AP can continuously perform the simultaneous transmission communication of the plurality of users according to the present invention by including the terminal information in the data frame of the simultaneous transmission of the plurality of users in the uplink direction.
- the occurrence of a QoS data frame in the STA may be grasped by using information in QoS “control” field defined in IEEE802.11e.
- terminal information may be collected in the background using a network other than a wireless LAN such as a mobile network or a wired network. For example, there are utilization of IEEE802.11k and other information exchange sequences.
- terminal information of all STAs is not collected in the AP, and for example, only STAs having uplink traffic may transmit terminal information to the AP.
- a predetermined STA collects terminal information of other STAs as in the third and fourth embodiments to be described later, only terminal information of STAs that can be heard by the predetermined STA may be collected.
- the AP selects a combination of STAs to be simultaneously transmitted in accordance with the collected terminal information, and determines pass / fail by calculating the data transmission efficiency when the STAs of the combination simultaneously transmit.
- the calculation of data transmission efficiency begins with the data rate determined from the frame size of the upstream traffic generated at each STA, the packet generation interval, the access category of the transmission packet, the propagation characteristics, the transmission capability of each STA, etc.
- a combination of STAs having high similarity is selected, and the data transmission efficiency of simultaneous transmission by the combination of STAs is calculated.
- the data transmission efficiency of the simultaneous transmission by the combination of the selected STAs is compared with the data transmission efficiency when the STA is transmitted alone, and if the former value is high, it is determined that the data transmission efficiency of the simultaneous transmission is good.
- the data transmission efficiency of the simultaneous transmission by the selected combination of STAs may be compared with a predetermined threshold value to determine whether the data transmission efficiency of the simultaneous transmission is good or bad.
- step S15 the AP generates a trigger frame TRG for instructing the simultaneous transmission of the selected simultaneous transmission STA, After executing carrier sense by CSMA / CA control and acquiring an access right, the trigger frame is transmitted.
- step S15 other RTS (Request to send) / CTS (Clear to send ⁇ ⁇ ⁇ ⁇ ) frames in CSMA / CA control are transmitted and received, and other times are assumed assuming that the selected STA completes simultaneous transmission. Processing such as setting a NAV that prohibits STA transmission may be performed.
- the trigger frame transmitted by the AP that has acquired the access right includes a combination of STAs that are simultaneously transmitted selected using terminal information collected for simultaneous transmission determination, radio communication resource information that each STA can use, frequency And information necessary for timing adjustment is included. Furthermore, the trigger frame may include, for example, penalty information for reducing the modulation scheme and coding rate when performing simultaneous transmission.
- the STAs that have received an instruction for simultaneous transmission by the trigger frame transmitted by the AP are based on the specified information, and are based on frequency division multiple access (FDMA), space division multiple access (SDMA, MU-MIMO), any of the other multiple access schemes, or a combination thereof.
- FDMA frequency division multiple access
- SDMA space division multiple access
- MU-MIMO any of the other multiple access schemes, or a combination thereof.
- the AP transmits the downlink data frame to be transmitted to the STA after acquiring the access right based on the CSMA / CA control. Therefore, the CSMA / CA control for transmitting the downlink data frame and the CSMA / CA control for transmitting the trigger frame instructing simultaneous transmission of the uplink data frame are adjusted in the access control unit 15 of the AP shown in FIG. I need it.
- priority control according to the access category when priority control according to the access category is performed on the downlink data frame, a configuration in which priority control according to the access category of the uplink data frame that is simultaneously transmitted in the trigger frame can be considered.
- priority control according to the access category is performed by setting parameters of CSMA / CA control.
- AIFS time corresponding to access category AC is used instead of DIFS time until it is determined that the channel is in an idle state.
- the AIFS time is set shorter for an access category having a higher priority.
- CWmin that is the minimum value of CW (Contention Window) that determines the random backoff value for collision avoidance
- CWmax that is the maximum value are also set according to the access category.
- CWmin and CWmax are set to smaller values for higher access categories.
- TXOP Transmission Opportunity
- TXOP Transmission Opportunity
- priority control between the downlink data frame and the trigger frame is performed for each access category.
- the access right is greater when the number of frames waiting for transmission or the amount of data is larger for each access category.
- a selection unit is provided to perform CSMA / CA control.
- FIG. 11 shows a configuration example 1 of the access control unit 15.
- an uplink / downlink transmission management function unit 100 inputs a downlink data frame in the AP and a trigger frame for instructing uplink simultaneous transmission, aggregates the number of frames or the amount of data for each access category, and downloads
- the data frame is input to the downlink data frame access control unit 20, and the trigger frame is input to the trigger frame access control unit 30.
- the downlink data frame access control unit 20 has a configuration shown in IEEE 802.11e, and includes a downlink data frame access category mapping unit 21, transmission queues 22-1 to 22-4 corresponding to the access category, and CSMA / CA.
- the control units 23-1 to 23-4 and the collision avoidance processing unit 24 are configured.
- the downlink data frame access category mapping unit 21 inserts the downlink data frame into the transmission queues 22-1 to 22-4 according to the access category.
- the downlink data frame waiting in each transmission queue is subjected to access control with the priority based on the EDCA parameter corresponding to the access category by the CSMA / CA control units 23-1 to 23-4.
- the trigger frame access control unit 30 has the same configuration as that of the downlink data frame access control unit 20, and includes a trigger frame access category mapping unit 31, transmission queues 32-1 to 32-4 corresponding to the access category, an access category CSMA / CA control units 33-1 to 33-4 and a collision avoidance processing unit 24 corresponding to the above.
- the trigger frame access category mapping unit 31 inserts the trigger frame into the transmission queues 32-1 to 32-4 corresponding to the access category.
- the trigger frame waiting in each transmission queue is subjected to access control with priority based on the EDCA parameter corresponding to the access category by the CSMA / CA control units 33-1 to 33-4.
- the CSMA / CA control units 23-i and 33-i corresponding to the access category i may be set in common with the default value of the EDCA parameter corresponding to the access category i, or the same access category i.
- the default value of the EDCA parameter may be weighted so that access control of the trigger frame is given priority.
- i is 1 to 4.
- the uplink / downlink transmission management function unit 100 based on the total number of downlink data frames and trigger frames or the amount of data for each access category, CSMA / CA control units 23-i, 33 of the same access category i. With respect to -i, the EDCA parameters are adjusted such that the access right is more easily acquired when the number of frames waiting for transmission or the amount of data in the transmission queues 22-i and 32-i is larger.
- the collision avoidance processing unit 24 is common to the downlink data frame access control unit 20 and the trigger frame access control unit 30.
- the collision avoidance processing unit 24 executes the access control with the higher priority when the transmission timing is overlapped in the access control of each access category, but between the downlink data frame and the trigger frame of the same access category, for example,
- the trigger frame access control may be executed preferentially.
- FIG. 12 shows a configuration example 2 of the access control unit 15.
- the configuration example 2 includes the CSMA / CA control units 23-1 to 23-4 of the downlink data frame access control unit 20 of the configuration example 1 and the CSMA / CA control unit 33 of the trigger frame access control unit 30. -1 to 33-4 are used in common.
- the uplink / downlink transmission management function unit 100 inputs a downlink data frame in the AP and a trigger frame for instructing simultaneous uplink transmission, totals the number of frames or the amount of data for each access category, and downloads the downlink data frame.
- the data is input to the data frame access category mapping unit 21, and the trigger frame is input to the trigger frame access category mapping unit 31.
- the downlink data frame access category mapping unit 21 inserts the downlink data frame into the transmission queues 22-1 to 22-4 according to the access category.
- the trigger frame access category mapping unit 31 inserts the trigger frame into the transmission queues 32-1 to 32-4 corresponding to the access category.
- One of the downlink data frame waiting in the transmission queue 22-i of the access category i and the trigger frame waiting in the transmission queue 32-i is selected via the selection unit 41-i, and the CSMA / CA control is performed. Access control is performed with priority based on the EDCA parameter corresponding to the access category i in the section 23-i.
- the uplink / downlink transmission management function unit 100 sends the transmission queue 22-i to the selection unit 41-i of the access category i based on the total number of downlink data frames and trigger frames or the amount of data for each access category.
- the i or 32-i selects the frame with the larger number of frames waiting for transmission or the amount of data, and the CSMA / CA control unit 23-i executes access control.
- the probability that the downlink data frame and the trigger frame are selected depends on the statistical probability that the random backoff value is the same. However, in the configuration example 2, one of them is definitely selected according to the number of frames waiting for transmission or the amount of data.
- the collision avoidance processing unit 41 executes the access control with the higher priority when the transmission timing is overlapped by the access control of each access category. Note that transmission timing overlaps due to access control between trigger frames and downlink data frames of different access categories, and may be between trigger frames or downlink data frames of different access categories.
- the access control unit 15 of the AP when transmitting a downlink data frame addressed to an STA or a trigger frame addressed to a plurality of STAs that simultaneously transmit an uplink data frame, is based on CSMA / CA control. Send after getting.
- STA also transmits an uplink data frame after acquiring an access right based on CSMA / CA control.
- CSMA / CA control For example, when there are a large number of STAs having a transmission request for one AP, if each performs CSMA / CA control, the probability that the AP acquires the access right may be significantly reduced. .
- simultaneous transmission of uplink data frames by multiple STAs eliminates the transmission request of each STA and, in turn, makes it easier for the AP to acquire the access right, but it was able to transmit trigger frames efficiently. Is the case.
- the EDCA when weighting the default value of the EDCA parameter corresponding to each access category so that the access control of the trigger frame is prioritized, the EDCA depends on the number of STAs having a transmission request. Parameters may be adjusted. For example, when traffic in both directions occurs, the CW size at the AP is set smaller than the default value, or a beacon frame or other wireless or wired network is connected to a STA that can be connected to the AP or a STA that transmits simultaneously. By using this frame and setting the CW size larger than the default value, the AP performing carrier sense to transmit the trigger frame for simultaneous transmission can start transmission preferentially.
- FIG. 4 shows a control sequence of the second embodiment in the wireless communication system of the present invention.
- FIG. 8 shows steps S21 to S29 as the simultaneous transmission control procedure of the second embodiment in the wireless communication system of the present invention.
- step S21 the AP collects and aggregates terminal information necessary for selecting STAs simultaneously transmitted from STA1 to STAn and controlling simultaneous transmission.
- steps S22 and S23 the AP selects a combination of STAs to be transmitted simultaneously according to the collected terminal information, and determines pass / fail by calculating the data transmission efficiency when the STAs of the combination simultaneously transmit.
- the AP performs a process of not performing the simultaneous transmission control in the uplink in step S24.
- the above processing is the same as steps S11 to S14 in the first embodiment shown in FIG.
- the STA transmits the trigger frame for instructing the uplink simultaneous transmission to the STA simultaneously transmitted by the AP.
- the access right is acquired on the side.
- step S25 a notification frame indicating that simultaneous transmission is possible is transmitted to the STA that simultaneously transmits.
- the STA that has acquired the access right through carrier sense and random backoff control transmits a request frame to the AP.
- STA1 transmits a request frame.
- the AP receives the request frame transmitted by the STA that has acquired the access right in step S26, the AP reselects the combination of STAs to be simultaneously transmitted according to the terminal information collected by the AP in steps S27 and S28.
- pass / fail is determined by recalculating the data transmission efficiency when the STAs of the combination simultaneously transmit.
- a STA combination different from the STA combination selected in step S22 may be selected. Further, since the STA that acquired the access right and transmitted the request frame is in an idle state, it may be determined as one of the STAs that transmit simultaneously.
- step S24 the AP does not perform the simultaneous transmission control in the uplink in step S24.
- step S29 the AP generates a trigger frame for instructing the simultaneous transmission of the selected simultaneous transmission STA. Send.
- the STA that has received the notification frame acquires the access right and transmits a request frame
- the AP that has received the request frame attempts to transmit a trigger frame after the SIFS time
- transmission is possible, and simultaneous transmission can be started.
- the request frame transmitted by the STA or the RTS / CTS frame separately transmitted / received If NAV is set for other STAs that are not selected as STAs to be simultaneously transmitted, the STAs selected according to the trigger frame of the AP can be surely simultaneously transmitted.
- FIG. 5 shows a control sequence of the third embodiment in the wireless communication system of the present invention.
- FIG. 9 shows steps S30 to S33, which are STA processes, and steps S34 to S39, which are AP processes, as the simultaneous transmission control procedure of the third embodiment in the wireless communication system of the present invention.
- the AP collects and aggregates terminal information of each STA and selects a combination of STAs to be simultaneously transmitted.
- the predetermined STAx is the other STAx. Terminal information is collected and aggregated, whether or not simultaneous transmission is possible is notified to the AP, and the AP selects a combination of STAs to be simultaneously transmitted in response to the notification.
- STA1 may collect terminal information from other STA2 to STAn by the AP method described in the first embodiment.
- the AP also collects terminal information of STA1 to STAn independently.
- step S30 the predetermined STAx collects and aggregates terminal information necessary for selection of STAs to be simultaneously transmitted and simultaneous transmission control.
- steps S31 and S32 the STAx selects a combination of STAs to be simultaneously transmitted according to its own and other terminal information, and determines the quality by calculating the data transmission efficiency when the STAs of the combination simultaneously transmit. If it is determined that the data transmission efficiency of the simultaneous transmission is not good, the process returns to step S31 and terminal information is collected again. On the other hand, if it is determined that the data transmission efficiency of the simultaneous transmission is good, in step S33, the STAx transmits a request frame indicating that simultaneous transmission is possible to the AP.
- the request frame may include combination information of STAs to be transmitted simultaneously or terminal information thereof, a request for access right acquisition at the AP, and a request to include the own STA in simultaneous transmission of multiple users in the uplink direction.
- the STAx may transmit a request frame to the AP when grasping the occurrence of the QoS data frame of the other STA.
- step S34 the AP collects and aggregates terminal information necessary for selection of STAs to be simultaneously transmitted from STA1 to STAn and simultaneous transmission control.
- the AP receives the request frame from the STA in step S35, the AP selects a combination of STAs to be simultaneously transmitted according to the terminal information collected so far in steps S36 and S37, and the STA of the combination simultaneously transmits. The data transmission efficiency is calculated to determine pass / fail.
- the request frame transmitted by the STA includes the combination information of the STAs transmitted simultaneously determined by the STA or the terminal information thereof, the combination of the STAs simultaneously transmitted together with the terminal information collected by the AP is selected. It may be used for processing. If the terminal information has been updated, a STA combination different from the STA combination selected in step S31 may be selected.
- step S38 a trigger frame for instructing simultaneous uplink transmission is generated for the selected simultaneously transmitting STA, and carrier sense and After acquiring the access right by the random back-off control, the trigger frame is transmitted.
- steps S30 to S33 in the STA are basically the same as steps S11 to S15 in the first embodiment.
- steps S34 to S39 in the AP are basically the same as steps S11 to S15 in the first embodiment.
- steps S34 to S39 in the AP are basically the same as steps S11 to S15 in the first embodiment.
- the processing burden on the AP can be reduced.
- FIG. 6 shows a control sequence of the fourth embodiment in the wireless communication system of the present invention.
- FIG. 10 shows steps S40 to S43, which are STA processes, and steps S44 to S49, which are AP processes, as the simultaneous transmission control procedure of the fourth embodiment in the wireless communication system of the present invention.
- the processing in steps S40 to S42 and S44 to S48 in the fourth embodiment is the same as the processing in steps S30 to S32 and S34 to S38 in the third embodiment, and the processing in steps S43 and S49 is the same as that in step S33 in the third embodiment. , S39 is different.
- the predetermined STAx determines that the data transmission efficiency of the simultaneous transmission is good in step S42, the predetermined STAx generates a request frame indicating that simultaneous transmission is possible in step S43, and grants the access right by carrier sense and random backoff control. After acquisition, send to AP.
- This request frame may include combination information of STAs transmitted at the same time or terminal information thereof, similarly to the request frame transmitted from the STA 1 to the AP in the third embodiment.
- the AP uses the trigger frame for instructing the selected simultaneous transmission STA to perform uplink simultaneous transmission. Generate and send.
- the fourth embodiment is characterized in that the AP transmits the trigger frame based on the access right acquired by the predetermined STAx as in the second embodiment. Therefore, as in the second embodiment, if the STA acquires an access right and transmits a request frame, and the AP that has received the request frame attempts to transmit a trigger frame in the SIFS time, the access right acquired by the STA It is possible to reliably transmit, and simultaneous transmission can be started.
- the request frame transmitted by the STA or the RTS / CTS frame separately transmitted / received If NAV is set for other STAs that are not selected as STAs to be simultaneously transmitted, the STAs selected according to the trigger frame of the AP can be surely simultaneously transmitted.
- the procedure for simultaneous uplink transmission from a plurality of STAs has been described.
- downlink transmission and uplink simultaneous transmission are performed. May be performed continuously.
- the AP starts control of simultaneous transmission in the uplink direction
- the presence / absence of a downlink data frame is determined.
- the STA selected as the combination for simultaneous transmission performs the simultaneous transmission.
- the trigger frame may be transmitted following transmission / reception of the downlink data frame and ACK.
- the downlink data frame and the trigger frame are transmitted together with a common combination of the STA that is the downlink destination and the STA that is simultaneously transmitted in the uplink direction, and the ACK of the downlink data frame is transmitted to the uplink data frame. May be transmitted together.
- the downlink data frame may be transmitted following the transmission of the AP trigger frame and the simultaneous transmission of the STA. In the case of this continuous processing, the access right acquired by the AP or STA assumes the transmission / reception period.
- the trigger frame can set a NAV that prohibits transmission to the peripheral terminal.
- the NAV period length set here is set based on the collected terminal information. There are several methods for setting the NAV and modifying it.
- Trigger frame does not set NAV, but simply requests data frame transmission.
- the STA can transmit the RTS frame, the AP can return the CTS frame, and the transmission of the data frame can be started.
- trigger frame or RTS frame sets the NAV for the peripheral terminal, and collects data frames from one or more STAs. Finally, the trigger frame is transmitted again to trigger simultaneous transmission.
- a trigger frame or RTS frame including multiple destination addresses for which the AP requests a response is transmitted, and a NAV is set for the peripheral terminal. Further, it may be specified that the NAV period length is changed by sequentially responding to the trigger frame with the STA specified by the destination address of the trigger frame or simultaneously responding by the multiple access method. Finally, the trigger frame is transmitted again to trigger simultaneous transmission.
- the first trigger frame is transmitted as the trigger frame, it is confirmed that the second trigger frame is returned from the designated STA, the third trigger frame is transmitted again, and the second trigger frame is returned.
- the data frame is received from the STA.
- the first trigger frame sets the NAV period length from the terminal information collected in the peripheral terminals, or sets a predetermined NAV period length.
- the STA receives the first trigger frame and transmits the second trigger frame.
- a plurality of STAs may transmit the second trigger frame at the same time, may transmit the second trigger frame at a timing scheduled at the time designated by the first, or the first trigger frame may be transmitted.
- the frame may be transmitted to one STA and the second trigger frame may be returned in order.
- the AP transmits a third trigger frame instructing transmission to the STA that has normally received the second trigger frame.
- the NAV period length is changed by the third trigger frame in accordance with the terminal information included in the second trigger frame or the combination in which the second trigger frame can be normally transmitted.
- the first trigger frame and the second trigger frame set the NAV in the same manner as the exchange of RTS / CTS
- the third trigger frame transmits the NAV of the peripheral terminal set by the first trigger frame. If not, it may be canceled.
- the third trigger frame may include information as a synchronization signal for simultaneous transmission by the STA, or may have a function as transfer of transmission right.
- the third trigger frame functions as a transfer of the transmission right, it is not necessary to transmit the third trigger frame immediately after receiving the second trigger frame, but to transmit a downstream data frame to a single STA or After going to a plurality of STAs, a third trigger frame may be transmitted.
- the request frame transmitted by the STA can be set to a NAV that prohibits transmission to peripheral terminals.
- the NAV period length set here is calculated from a value notified in advance by the AP or a length necessary for a data frame to be transmitted by the STA. There are several methods for setting the NAV and modifying it.
- Request frame transmission is requested without setting NAV.
- the sequence after the trigger frame is transmitted can be communicated by the three methods shown in the first and third embodiments.
- the request frame sets the NAV for the peripheral terminal and causes the AP to transmit the trigger frame.
- the AP may determine and change the combination of STAs that allow simultaneous transmission of a plurality of uplink users according to information such as the NAV period length specified by the STA.
- communication can be further performed by the three methods shown in the first and third embodiments. Since the NAV is set once in the request frame, the NAV period length can be changed in the subsequent communication.
- the MCS index indicating the modulation scheme and coding rate used for the user data in the first to fourth embodiments can be determined by the AP or STA as follows, for example.
- the MCS index can be determined in consideration of the communication result so far, or can be determined in view of the penalty due to simultaneous transmission by multiple users.
- Multiplexing refers to a multiple access scheme using, for example, a frequency division multiple access scheme (FDMA), a spatial division multiple access scheme (SDMA, MU-MIMO), or both.
- FDMA frequency division multiple access scheme
- SDMA spatial division multiple access scheme
- MU-MIMO spatial division multiple access scheme
- FDMA frequency division multiple access scheme
- SDMA spatial division multiple access scheme
- MU-MIMO spatial division multiple access scheme
- FDMA frequency division multiple access scheme
- MU-MIMO spatial division multiple access scheme
- communication quality may be deteriorated due to interference between users caused by imperfect spatial signal separation. It is better to change to the one corresponding to the lower number of bits.
- MU-MIMO has a larger penalty than FDMA.
- Estimate the number of multiplexed users and the multiplexing method used in the AP refer to the penalty from a pre-stored table based on the assumed multiplexing number and multiplexing method, and lower the number of bits than in the case of single user communication.
- a corresponding MCS index is determined. Also, when determining the penalty, the penalty can be calculated for the user combination from the correlation value of the channel state propagation characteristic information for the STA.
- a penalty for simultaneous transmission by multiple users is notified from the AP, and an MCS index corresponding to a lower number of bits than in the case of single user communication is determined.
- the MCS index used for simultaneous transmission by multiple users is notified from the AP, and the designated MCS index is used.
- a value indicating how many bits should be reduced from selectable options for the MCS index that can be used is used, or the amount of decrease in the signal-to-interference noise power ratio (SINR) Can be a number less than 1 ⁇ ⁇ ⁇ or a quantized value in decibels.
- SINR signal-to-interference noise power ratio
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Abstract
Description
ことを特徴とする無線通信システム。
図1において、1つのAPと複数のSTA1~STAnが接続される。実線は、APとSTA1~STAnとの間で無線フレームの送受信が可能なことを示す。破線は、STA1がSTA2およびSTA3の送信する無線フレームを受信可能なことを示す。
図2において、APおよびSTAは、無線フレームの送受信および同時送信における多元接続処理を行う無線通信部11、無線フレームの送受信制御を含む全般の制御を行う制御部12、各制御に必要な情報を管理する情報管理部13、各STAの端末情報を収集し、同時送信するSTAの組合せの選定および同時送信のデータ伝送効率の良否を判定し、同時送信するSTAに対して同時送信制御に必要な情報を通知するトリガフレームを生成する同時送信判定部14、CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance)制御により無線フレームのアクセス権を取得するアクセス制御部15により構成される。ここで、無線フレームには、APが送信する下りデータフレーム、STAが送信する上りデータフレーム、STAの同時送信制御に用いる端末情報,通知フレーム,要求フレーム,トリガフレームなどの制御信号がある。
図3は、本発明の無線通信システムにおける実施例1の制御シーケンスを示す。
図7は、本発明の無線通信システムにおける実施例1の同時送信制御手順として、ステップS11~S15を示す。
APは、ステップS11において、STA1~STAnから同時送信するSTAの選定および同時送信制御に必要な端末情報を収集して集計する。端末情報は、各STAにおけるトラヒック情報や、各STAからの受信電力やチャネル状態などの伝搬特性情報である。
図11において、上り/下り送信管理機能部100は、APにおける下りデータフレームと上りリンク同時送信を指示するためのトリガフレームを入力し、アクセスカテゴリごとに各フレーム数またはデータ量を集計し、下りデータフレームを下りデータフレーム用アクセス制御部20に入力し、トリガフレームをトリガフレーム用アクセス制御部30に入力する。
図12において、構成例2は、構成例1の下りデータフレーム用アクセス制御部20のCSMA/CA制御部23-1~23-4と、トリガフレーム用アクセス制御部30のCSMA/CA制御部33-1~33-4を共通化したものである。
図4は、本発明の無線通信システムにおける実施例2の制御シーケンスを示す。
図8は、本発明の無線通信システムにおける実施例2の同時送信制御手順として、ステップS21~S29を示す。
図5は、本発明の無線通信システムにおける実施例3の制御シーケンスを示す。
図9は、本発明の無線通信システムにおける実施例3の同時送信制御手順として、STAの処理であるステップS30~S33と、APの処理であるステップS34~S39を示す。
実施例1および実施例2は、APが各STAの端末情報を収集して集計し、同時送信するSTAの組合せを選定する手順であったが、実施例3は、所定のSTAxが自他の端末情報を収集して集計し、同時送信可能であるか否かを判断してAPに通知し、APが当該通知に応じて同時送信するSTAの組合せを選定することを特徴とする。例えば図1に示すSTA1において、STA2およびSTA3の上りフレームをヒアリングし、端末情報としてそれらのトラヒック情報を収集する場合が想定される。あるいは、STA1が実施例1で説明したAPの手法により他のSTA2~STAnから端末情報を収集してもよい。ただし、APも実施例1と同様に、独自にSTA1~STAnの端末情報を収集するものとする。
図6は、本発明の無線通信システムにおける実施例4の制御シーケンスを示す。
図10は、本発明の無線通信システムにおける実施例4の同時送信制御手順として、STAの処理であるステップS40~S43と、APの処理であるステップS44~S49を示す。なお、実施例4のステップS40~S42,S44~S48の処理は、実施例3におけるステップS30~S32,S34~S38の処理と同じであり、ステップS43,S49の処理が実施例3におけるステップS33,S39の処理と異なる。
(2) 要求フレームを使ったポーリングによりNAVを設定しつつ、トリガフレームの送信を要求する。この場合、要求フレームが周辺端末に対し、NAVを設定し、APにトリガフレームを送信させる。この際に、APにおいて、STAが指定したNAV期間長などの情報に応じて、上り複数ユーザ同時送信を行わせるSTAの組み合わせを決定・変更してもよい。トリガフレーム送信後に、さらに上記の実施例1と実施例3で示した3つの方法により通信することができる。NAVは要求フレームで一度設定しているため、その後の通信で、NAV期間長を変更することができる。
(2) APで用いるユーザの多重数およびその多重方式を推定し、想定した多重数と多重方式から、予め記憶しているテーブルからペナルティを参照し、シングルユーザ通信の場合よりも低いビット数に対応するMCSインデックスを決定する。また、ペナルティを決定する際に、STAに対するチャネル状態の伝搬特性情報の相関値からペナルティをユーザ組み合わせに対し算出することもできる。
(4) APから複数ユーザ同時送信で用いるMCSインデックスを通知し、指定されたMCSインデックスを用いる。
STA 無線LAN端末装置
11 無線通信部
12 制御部
13 情報管理部
14 同時送信判定部
15 アクセス制御部
Claims (22)
- 1つの無線LAN基地局装置(以下、「AP」という)と複数の無線LAN端末装置(以下、「STA」という)が接続され、複数のSTAからAPに無線フレームを多元接続方式で同時送信を行う無線通信システムにおいて、
前記APは、
前記複数のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集する端末情報収集手段と、
前記端末情報に応じて同時送信するSTAの組合せを選定する同時送信判定手段と、
前記同時送信するSTAに対して、同時送信を指示しかつ同時送信制御に必要な情報を含むトリガフレームを送信するトリガ送信手段と
を備え、
前記トリガフレームにより指定されたSTAが前記APに同時に無線フレームを送信する構成である
ことを特徴とする無線通信システム。 - 1つの無線LAN基地局装置(以下、「AP」という)と複数の無線LAN端末装置(以下、「STA」という)が接続され、複数のSTAからAPに無線フレームを多元接続方式で同時送信を行う無線通信システムにおいて、
前記複数のSTAのうち所定のSTAは、
自他のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集する端末情報収集手段と、
前記端末情報によりQoS(Quality of Service)データフレームの発生を把握し、同時送信を要求する要求フレームを前記APに送信する同時送信要求手段と
を備え、
前記APは、
前記複数のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集する端末情報収集手段と、
前記所定のSTAから送信される前記要求フレームの受信により、前記端末情報に応じて同時送信するSTAの組合せを選定する同時送信判定手段と、
前記同時送信するSTAに対して、同時送信を指示しかつ同時送信制御に必要な情報を含むトリガフレームを送信するトリガ送信手段と
を備え、
前記トリガフレームにより指定されたSTAが前記APに同時に無線フレームを送信する構成である
ことを特徴とする無線通信システム。 - 請求項1または請求項2に記載の無線通信システムにおいて、
前記APは、前記STA宛の無線フレームおよび同時送信する複数のSTA宛の前記トリガフレームのそれぞれに対して個別のCSMA/CA制御を実行するときに、送信待機のフレーム数またはデータ量が多い方がアクセス権を取得しやすいCSMA/CA制御のパラメータを設定し、該個別のCSMA/CA制御によりアクセス権を取得した無線フレームまたは前記トリガフレームを送信するアクセス制御手段を備えた
ことを特徴とする無線通信システム。 - 請求項1または請求項2に記載の無線通信システムにおいて、
前記APは、前記STA宛の無線フレームおよび同時送信する複数のSTA宛の前記トリガフレームのそれぞれに対して共通のCSMA/CA制御を実行するときに、送信待機のフレーム数またはデータ量が多い方の無線フレームまたは前記トリガフレームを選択し、該共通のCSMA/CA制御によりアクセス権を取得して送信するアクセス制御手段を備えた
ことを特徴とする無線通信システム。 - 請求項1または請求項2に記載の無線通信システムにおいて、
前記端末情報収集手段は、前記端末情報として前記STAのトラヒック情報を収集する構成であり、
前記同時送信判定手段は、前記トラヒック情報に基づいて前記STAから前記APに送信する無線フレームの有無を判定または予測し、前記同時送信するSTAの組合せの選定に用いる構成である
ことを特徴とする無線通信システム。 - 請求項1または請求項2に記載の無線通信システムにおいて、
前記端末情報収集手段は、前記端末情報として前記STAの伝搬特性情報を収集する構成であり、
前記同時送信判定手段は、前記収集した伝搬特性情報に基づいて、前記STAの組合せで同時送信した場合のデータ伝送効率と、STA単体で送信した場合のデータ伝送効率とを比較し、同時送信のデータ伝送効率が高い場合に同時送信するSTAの組合せとして選定する構成である
ことを特徴とする無線通信システム。 - 請求項1または請求項2に記載の無線通信システムにおいて、
前記トリガ送信手段は、前記トリガフレームに、同時送信を行う際の変調方式および符号化率を低下させるペナルティ情報を含める
ことを特徴とする無線通信システム。 - 請求項1に記載の無線通信システムにおいて、
前記同時送信判定手段は、前記同時送信するSTAに対して、同時送信可能になったことを示す通知フレームを送信し、該通知フレームを受信したSTAに同時送信するためのアクセス権の取得を行わせ、該アクセス権を取得したSTAから送信された要求フレームに応じて、再度前記端末情報に応じて同時送信するSTAの組合せを選定する構成であり、
前記通知フレームを受信したSTAは、同時送信するためのアクセス権を取得して前記要求フレームを前記APに送信する構成である
ことを特徴とする無線通信システム。 - 請求項2に記載の無線通信システムにおいて、
前記所定のSTAの同時送信要求手段は、前記APに前記要求フレームを送信する前に、同時送信するためのアクセス権を取得する構成である
ことを特徴とする無線通信システム。 - 1つの無線LAN基地局装置(以下、「AP」という)と複数の無線LAN端末装置(以下、「STA」という)が接続され、複数のSTAからAPに無線フレームを多元接続方式で同時送信を行う無線通信方法において、
前記APは、
前記複数のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集するステップ1と、
前記端末情報に応じて同時送信するSTAの組合せを選定するステップ2と、
前記同時送信するSTAに対して、同時送信を指示しかつ同時送信制御に必要な情報を含むトリガフレームを送信するステップ3と
を有し、
前記トリガフレームにより指定されたSTAが前記APに同時に無線フレームを送信する
ことを特徴とする無線通信方法。 - 1つの無線LAN基地局装置(以下、「AP」という)と複数の無線LAN端末装置(以下、「STA」という)が接続され、複数のSTAからAPに無線フレームを多元接続方式で同時送信を行う無線通信方法において、
前記複数のSTAのうち所定のSTAは、
自他のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集するステップ1と、
前記端末情報によりQoS(Quality of Service)データフレームの発生を把握し、同時送信を要求する要求フレームを前記APに送信するステップ2と
を有し、
前記APは、
前記複数のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集するステップ1と、
前記所定のSTAから送信される前記要求フレームの受信により、前記端末情報に応じて同時送信するSTAの組合せを選定するステップ2と、
前記同時送信するSTAに対して、同時送信を指示しかつ同時送信制御に必要な情報を含むトリガフレームを送信するステップ3と
を有し、
前記トリガフレームにより指定されたSTAが前記APに同時に無線フレームを送信する
ことを特徴とする無線通信方法。 - 請求項10または請求項11に記載の無線通信方法において、
前記APは、前記STA宛の無線フレームおよび同時送信する複数のSTA宛の前記トリガフレームのそれぞれに対して個別のCSMA/CA制御を実行するときに、送信待機のフレーム数またはデータ量が多い方がアクセス権を取得しやすいCSMA/CA制御のパラメータを設定し、該個別のCSMA/CA制御によりアクセス権を取得した無線フレームまたは前記トリガフレームを送信する
ことを特徴とする無線通信方法。 - 請求項10または請求項11に記載の無線通信方法において、
前記APは、前記STA宛の無線フレームおよび同時送信する複数のSTA宛の前記トリガフレームのそれぞれに対して共通のCSMA/CA制御を実行するときに、送信待機のフレーム数またはデータ量が多い方の無線フレームまたは前記トリガフレームを選択し、該共通のCSMA/CA制御によりアクセス権を取得して送信する
ことを特徴とする無線通信方法。 - 請求項10または請求項11に記載の無線通信方法において、
前記ステップ1は、前記端末情報として前記STAのトラヒック情報を収集し、
前記APのステップ2は、前記トラヒック情報に基づいて前記STAから前記APに送信する無線フレームの有無を判定または予測し、前記同時送信するSTAの組合せの選定に用いる
ことを特徴とする無線通信方法。 - 請求項10または請求項11に記載の無線通信方法において、
前記ステップ1は、前記端末情報として前記STAの伝搬特性情報を収集する構成であり、
前記APのステップ2は、前記収集した伝搬特性情報に基づいて、前記STAの組合せで同時送信した場合のデータ伝送効率と、STA単体で送信した場合のデータ伝送効率とを比較し、同時送信のデータ伝送効率が高い場合に同時送信するSTAの組合せとして選定する
ことを特徴とする無線通信方法。 - 請求項10または請求項11に記載の無線通信方法において、
前記ステップ3は、前記トリガフレームに、同時送信を行う際の変調方式および符号化率を低下させるペナルティ情報を含める
ことを特徴とする無線通信方法。 - 請求項10に記載の無線通信方法において、
前記APのステップ2は、前記同時送信するSTAに対して、同時送信可能になったことを示す通知フレームを送信し、該通知フレームを受信したSTAに同時送信するためのアクセス権の取得を行わせ、該アクセス権を取得したSTAから送信された要求フレームに応じて、再度前記端末情報に応じて同時送信するSTAの組合せを選定し、
前記通知フレームを受信したSTAは、同時送信するためのアクセス権を取得して前記要求フレームを前記APに送信する
ことを特徴とする無線通信方法。 - 請求項11に記載の無線通信方法において、
前記所定のSTAのステップ2は、前記APに前記要求フレームを送信する前に、同時送信するためのアクセス権を取得する
ことを特徴とする無線通信方法。 - 1つの無線LAN基地局装置と複数の無線LAN端末装置(以下、「STA」という)が接続され、複数のSTAから無線LAN基地局装置に無線フレームを多元接続方式で同時送信を行う無線通信システムの無線LAN基地局装置において、
前記複数のSTAから同時送信するSTAの選定および同時送信制御に用いる端末情報を収集する端末情報収集手段と、
前記端末情報に応じて同時送信するSTAの組合せを選定する同時送信判定手段と、
前記同時送信するSTAに対して、同時送信を指示しかつ同時送信制御に必要な情報を含むトリガフレームを送信するトリガ送信手段と
を備えたことを特徴とする無線LAN基地局装置。 - 請求項19に記載の無線LAN基地局装置において、
前記STA宛の無線フレームおよび同時送信する複数のSTA宛の前記トリガフレームのそれぞれに対して個別のCSMA/CA制御を実行するときに、送信待機のフレーム数またはデータ量が多い方がアクセス権を取得しやすいCSMA/CA制御のパラメータを設定し、該個別のCSMA/CA制御によりアクセス権を取得した無線フレームまたは前記トリガフレームを送信するアクセス制御手段を備えた
ことを特徴とする無線LAN基地局装置。 - 請求項19に記載の無線LAN基地局装置において、
前記STA宛の無線フレームおよび同時送信する複数のSTA宛の前記トリガフレームのそれぞれに対して共通のCSMA/CA制御を実行するときに、送信待機のフレーム数またはデータ量が多い方の無線フレームまたは前記トリガフレームを選択し、該共通のCSMA/CA制御によりアクセス権を取得して送信するアクセス制御手段を備えた
ことを特徴とする無線LAN基地局装置。 - 1つの無線LAN基地局装置(以下、「AP」という)と複数の無線LAN端末装置が接続され、複数の無線LAN端末装置からAPに無線フレームを多元接続方式で同時送信を行う無線通信システムの無線LAN端末装置において、
自他の無線LAN端末装置から同時送信する無線LAN端末装置の選定および同時送信制御に用いる端末情報を収集する端末情報収集手段と、
前記端末情報によりQoS(Quality of Service)データフレームの発生を把握し、同時送信を要求する要求フレームを前記APに送信する同時送信要求手段と
を備えたことを特徴とする無線LAN端末装置。
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