Wireless communication method using trigger information and wireless communication terminal thereof

Abstract

The present invention relates to a wireless communication method using trigger information and a wireless communication terminal thereof. A wireless communication terminal for wireless communication is provided, the wireless communication terminal including: a transmission / reception unit; and a processor. The processor receives trigger information from a base station wireless communication terminal using the transmission / reception unit, and transmits an aggregated MAC protocol data unit (A-MPDU) to the base station wireless communication terminal based on the trigger information.

Description

[0001] This application is a divisional application of patent application No. 201780041848.0 (PCT / KR2017 / 007266), filed with the China Patent Office on January 4, 2019, with an international application date of July 6, 2017, entitled "A wireless communication method using trigger information and a wireless communication terminal using the method". Technical Field

[0002] This invention relates to a wireless communication method and a wireless communication terminal using trigger information. Background Technology

[0003] In recent years, with the expansion of the supply of mobile devices, wireless communication technologies that can provide fast wireless internet services to mobile devices have attracted significant public attention. Wireless communication technologies allow mobile devices, including smartphones, smart tablets, laptops, portable multimedia players, and embedded devices, to access the internet wirelessly in homes, offices, or specific service areas.

[0004] One of the most well-known wireless communication technologies is wireless LAN. Since using the 2.4 GHz frequency to support the initial wireless LAN technology, the Institute of Electrical and Electronics Engineers (IEEE) 802.11 has commercialized or developed various technical standards. First, IEEE 802.11b supported a maximum communication speed of 11 Mbps when using the 2.4 GHz band. Following IEEE 802.11b, IEEE 802.11a, commercialized after IEEE 802.11b, used the 5 GHz band instead of the 2.4 GHz band, reducing interference compared to the significantly congested 2.4 GHz band, and increasing communication speeds up to a maximum of 54 Mbps through the use of Orthogonal Frequency Division Multiplexing (OFDM) technology. However, a drawback of IEEE 802.11a is its shorter communication range compared to IEEE 802.11b. Furthermore, IEEE 802.11g, similar to IEEE 802.11b, uses the 2.4 GHz frequency band to achieve a maximum communication speed of 54 Mbps and meets backward compatibility, which has attracted significant public attention. Moreover, it is superior to IEEE 802.11a in terms of communication range.

[0005] Furthermore, IEEE 802.11n has been provided as a technical standard established to overcome the limitations of communication speed, a weakness identified in wireless LANs. IEEE 802.11n aims to improve network speed and reliability and extend the operating distance of wireless networks. More specifically, IEEE 802.11n supports high throughput (HT) data processing speeds of up to 540 Mbps or higher, and further utilizes multiple antennas on both sides of the transmitting and receiving units to minimize transmission errors and optimize data speed using Multiple-Input Multiple-Output (MIMO) technology. Additionally, the standard can use coding schemes that transmit multiple overlapping copies to improve data reliability.

[0006] With the active supply of wireless LANs and the further diversification of applications using them, the need for new wireless LAN systems to support higher throughput (Very High Throughput (VHT)) than those supported by IEEE 802.11n has gained public attention. Among these, IEEE 802.11ac supports a wide bandwidth (80 to 160 MHz) at the 5 GHz frequency. The IEEE 802.11ac standard is defined only within the 5 GHz band, but initial 11ac chipsets will even support operation in the 2.4 GHz band for backward compatibility with existing 2.4 GHz band products. Theoretically, according to this standard, wireless LAN speeds across multiple stations can reach up to 1 Gbps and maximum single-link speeds can reach up to 500 Mbps. This is achieved through concepts that expand the wireless interface accepted by 802.11n, such as wider wireless frequency bandwidth (up to 160 MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density modulation (up to 256 QAM). Additionally, IEEE 802.11ad has been proposed as a solution to transmit data using the 60GHz band instead of the existing 2.4GHz / 5GHz band. IEEE 802.11ad is a standard that uses beamforming technology to provide speeds up to 7Gbps and is suitable for transmitting high-bitrate motion picture streams such as massive amounts of data or uncompressed HD video. However, a disadvantage of the 60GHz band is that it is difficult to penetrate obstacles, meaning it can only be used between devices in short-distance spaces.

[0007] Meanwhile, in recent years, as the next-generation wireless communication technology standard following 802.11ac and 802.11ad, discussions have continued regarding high-efficiency and high-performance wireless communication technologies for high-density environments. In other words, the next-generation wireless communication technology environment requires providing high-frequency-efficiency communication indoors / outdoors in the presence of high-density terminals and base station terminals, and necessitates various technologies to achieve this communication.

[0008] In particular, with the increasing number of devices using wireless communication technology, it is necessary to use predetermined channels efficiently. Therefore, what is needed is a technology that can efficiently utilize bandwidth by simultaneously transmitting data between multiple terminals and base station terminals. Summary of the Invention

[0009] Technical issues

[0010] The purpose of embodiments of the present invention is to provide a wireless communication terminal that uses trigger information.

[0011] Technical solution

[0012] According to an embodiment of the present invention, a wireless communication terminal for wireless communication includes: a transceiver; and a processor, wherein the processor is configured to receive trigger information from a base station wireless communication terminal using the transceiver, and to transmit an Aggregated MAC Protocol Data Unit (A-MPDU) to the base station wireless communication terminal based on the trigger information.

[0013] The processor can be configured to determine, based on the triggering information, whether to aggregate MPDUs requesting immediate responses to generate the A-MPDU.

[0014] The triggering information may be a trigger frame, and the trigger frame may include a signaling field indicating whether the wireless communication terminal is allowed to aggregate MPDUs requesting immediate response and generate the A-MPDU. The processor may be configured to aggregate MPDUs requesting immediate response to generate the A-MPDU based on the signaling field.

[0015] When the value of the signaling field is a predetermined value, the processor can be configured to generate an A-MPDU that does not include an MPDU requesting an immediate response. When the value of the signaling field is within a predetermined range, the signaling field can indicate the maximum number of TIDs that the A-MPDU can have when the wireless terminal generates the A-MPDU, and the processor can be configured to generate the A-MPDU based on the maximum number of TIDs.

[0016] Furthermore, when the value of the signaling field is within a predetermined range, the processor can be configured to aggregate action frames to generate the A-MPDU, regardless of the maximum number of TIDs that the A-MPDU can have.

[0017] An MPDU that does not request an immediate response may include a Quality of Service (QoS) empty frame that does not request an ACK for data transmission.

[0018] In addition, MPDUs that do not request an immediate response may include action no-acck frames that do not request an ACK for data transmission.

[0019] In addition, an MPDU requesting an immediate response may include an action frame.

[0020] At this time, when the value of the signaling field is within a predetermined range, the processor can be configured to aggregate action frames to generate the A-MPDU, regardless of the maximum number of TIDs that the A-MPDU can have.

[0021] An MPDU that does not request an immediate response may include a frame without an ACK action that does not request an ACK for data transmission.

[0022] When the triggering information is included in the MAC header, the processor can be configured to aggregate either the ACK frame and the block ACK (BA) frame, as well as the MPDU that does not request an immediate response, to generate the A-MPDU.

[0023] An MPDU that does not request an immediate response may include at least one of a QoS empty frame that does not request an ACK for data transmission and a frame without an ACK action that does not request an ACK for data transmission.

[0024] According to an embodiment of the present invention, a wireless communication base station wireless communication terminal includes: a transceiver; and a processor, wherein the processor is configured to use the transceiver to send trigger information to a plurality of wireless communication terminals, and to receive from at least one of the plurality of wireless communication terminals an Aggregated MAC Protocol Data Unit (A-MPDU) generated based on the trigger information.

[0025] The triggering information may be a trigger frame, and the trigger frame may include a first signaling field indicating information about the type of MPDU included in the A-MPDU, wherein the processor may be configured to set the value of the first signaling field to a predetermined value when the wireless communication terminal corresponding to the first signaling field is not allowed to aggregate the MPDU requesting an immediate response and generate the A-MPDU.

[0026] When a wireless communication terminal corresponding to the first signaling field is allowed to aggregate an MPDU requesting an immediate response and generate the A-MPDU, the processor can be configured to set the value of the first signaling field according to the maximum number of TIDs that the A-MPDU can have.

[0027] The maximum number of TIDs that the A-MPDU can have can indicate the maximum number of TIDs that the A-MPDU can have that request an immediate response.

[0028] A Quality of Service (QoS) empty frame that does not request an ACK for data transmission may not correspond to a TID that requests an immediate response.

[0029] The trigger frame may include a second signaling field that indicates whether channel sensing is required when transmitting a trigger-based physical layer data unit (PPDU).

[0030] The processor can be configured to set the value of the first signaling field based on the value of the second signaling field.

[0031] When the second signaling field is set to indicate that channel sensing is not required for triggered PPDU transmissions, the processor can be configured to set the value of the first signaling field to a predetermined value.

[0032] The trigger frame may include a third signaling field indicating information about the length of the trigger-based PPDU, wherein the processor may be configured to set the value of the first signaling field based on the value of the third signaling field.

[0033] According to an embodiment of the present invention, the operation method of the wireless communication terminal of the wireless communication includes receiving trigger information from the base station wireless communication terminal; and sending the aggregated MAC protocol data unit (A-MPDU) to the base station wireless communication terminal based on the trigger information.

[0034] Beneficial effects

[0035] Embodiments of the present invention provide a wireless communication method using trigger information and a wireless communication terminal using the method. Attached Figure Description

[0036] Figure 1 A wireless LAN system according to an embodiment of the present invention is shown.

[0037] Figure 2 A wireless LAN system according to another embodiment of the present invention is shown.

[0038] Figure 3 A block diagram illustrating the configuration of a station according to an embodiment of the present invention is shown.

[0039] Figure 4 A block diagram illustrating the configuration of an access point according to an embodiment of the present invention is shown.

[0040] Figure 5 The process of setting up access points and links at a site according to an embodiment of the present invention is illustrated.

[0041] Figure 6 An embodiment of the present invention illustrates a method for generating an aggregated MAC protocol data unit (A-MPDU) by a wireless communication terminal.

[0042] Figure 7 An embodiment of the present invention is shown, which describes a method for a wireless communication terminal to transmit a block ACK (BA) frame for an A-MPDU.

[0043] Figure 8 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to an embodiment of the present invention.

[0044] Figure 9 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to another embodiment of the present invention.

[0045] Figure 10 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to another embodiment of the present invention.

[0046] Figure 11 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to another embodiment of the present invention.

[0047] Figure 12 The operation of setting the maximum number of TIDs for a wireless communication terminal according to an embodiment of the present invention is illustrated.

[0048] Figure 13 The operation of a wireless communication terminal transmitting an A-MPDU based on a UL MU RS according to an embodiment of the present invention is described.

[0049] Figure 14 The operation of a wireless communication terminal transmitting an A-MPDU based on a UL MU RS according to another embodiment of the present invention is described.

[0050] Figure 15 The operation of a wireless communication terminal transmitting an A-MPDU based on a UL MU RS according to another embodiment of the present invention is described.

[0051] Figure 16 An AP according to an embodiment of the present invention is shown to use a trigger frame to signal the transmit power of the trigger frame to multiple wireless communication terminals, and the multiple wireless communication terminals adjust the transmit power of the MU PPDU based on the transmit power of the trigger frame.

[0052] Figure 17An embodiment of the present invention illustrates a method for a wireless communication terminal to measure the RSSI of a MU PPDU.

[0053] Figure 18 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal is shown according to another embodiment of the present invention.

[0054] Figure 19 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal is shown according to another embodiment of the present invention.

[0055] Figure 20 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal is shown according to another embodiment of the present invention.

[0056] Figure 21 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal is shown according to another embodiment of the present invention.

[0057] Figure 22 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal is shown according to another embodiment of the present invention.

[0058] Figure 23 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal is shown according to another embodiment of the present invention.

[0059] Figure 24 The operation of a wireless communication terminal according to an embodiment of the present invention is illustrated. Detailed Implementation

[0060] Preferred embodiments of the invention will be described in more detail below with reference to the accompanying drawings. However, the invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Parts irrelevant to the description have been omitted from the drawings in order to clearly illustrate the invention, and similar reference numerals refer to similar elements throughout.

[0061] Furthermore, when describing something as including (or containing or having) some elements, it should be understood that, without specific limitations, it may include (or contain or have) only those elements, or it may include (or contain or have) other elements as well as those elements.

[0062] This application claims priority and benefit to Korean Patent Applications No. 10-2016-0085764 (July 6, 2016), No. 10-2016-0117898 (September 13, 2016), and No. 10-2016-0048145 (April 13, 2017), filed with the Korean Intellectual Property Office, and the embodiments and references described in the respective applications are included in the detailed description of this application.

[0063] Figure 1 This is a diagram illustrating a wireless communication system according to an embodiment of the present invention. For ease of description, embodiments of the present invention are described using a wireless LAN system. A wireless LAN system includes one or more Basic Service Sets (BSSs), and a BSS represents a collection of devices that have successfully synchronized with each other to communicate. Generally, BSSs can be classified into Infrastructure BSSs and Standalone BSSs (IBSSs). Figure 1 The diagram illustrates the infrastructure BSS between them.

[0064] like Figure 1 As illustrated, the infrastructure BSS (BSS1 and BSS2) includes one or more stations STA1, STA2, STA3, STA4 and STA5, access points PCP / AP-1 and PCP / AP-2 as stations providing distribution services, and a distribution system (DS) connecting multiple access points PCP / AP-1 and PCP / AP-2.

[0065] A station (STA) is a predetermined device that includes Media Access Control (MAC) conforming to the IEEE 802.11 standard and a physical layer interface for wireless media, and broadly includes non-access point (non-AP) stations and access points (APs). Additionally, in this specification, the term "terminal" may be used to refer to a wireless LAN communication device including concepts such as a non-AP STA or AP, or both. A station for wireless communication includes a processor and a transceiver, and according to this embodiment, may further include a user interface unit and a display unit. The processor can generate frames to be transmitted via the wireless network or process frames received via the wireless network, and further performs various processes for controlling the station. Furthermore, the transceiver is functionally connected to the processor and transmits and receives frames via the wireless network used for the station.

[0066] An access point (AP) is an entity that provides access to a distribution system (DS) for its associated stations via wireless media. In a base station infrastructure (BSS), communication between non-AP stations is generally performed via the AP; however, direct communication can also be achieved between non-AP stations when a direct link is configured. Furthermore, in this invention, the AP is used as a concept encompassing a Personal BSS Coordination Point (PCP) and can be broadly categorized as including a centralized controller, base station (BS), node B, base transceiver system (BTS), and site controller.

[0067] Multiple infrastructure BSSs can be interconnected through a distribution system (DS). In this case, the multiple BSSs connected through the distribution system are referred to as an Extended Service Set (ESS).

[0068] Figure 2 The illustration shows a standalone BSS as a wireless communication system according to another embodiment of the present invention. For ease of description, another embodiment of the present invention is described using a wireless LAN system. Figure 2 In the embodiment, the pair with Figure 1 The same or corresponding parts of the embodiments are described repeatedly.

[0069] because Figure 2 The BSS3 shown in the diagram is a standalone BSS and does not include an access point (AP), so all stations STA6 and STA7 are not connected to the AP. A standalone BSS is not permitted to access the distribution system and form a complete network. Within a standalone BSS, the corresponding stations STA6 and STA7 can connect directly to each other.

[0070] Figure 3 This is a block diagram illustrating the configuration of station 100 according to an embodiment of the present invention.

[0071] like Figure 3 As illustrated, the station 100 according to an embodiment of the present invention may include a processor 110, a transceiver 120, a user interface unit 140, a display unit 150, and a memory 160.

[0072] First, transceiver 120 transmits and receives wireless signals such as wireless LAN physical layer frames and can be embedded in station 100 or configured externally. According to this embodiment, transceiver 120 may include at least one transmit and receive module using different frequency bands. For example, transceiver 120 may include transmit and receive modules with different frequency bands such as 2.4 GHz, 5 GHz, and 60 GHz. According to an embodiment, station 100 may include transmit and receive modules using 6 GHz or higher frequency bands and transmit and receive modules using 6 GHz or lower frequency bands. The corresponding transmit and receive modules can perform wireless communication with the AP or external station according to the wireless LAN standard of the frequency band supported by the corresponding transmit and receive module. Transceiver 120 may operate only one transmit and receive module at a time or operate multiple transmit and receive modules simultaneously, depending on the performance and requirements of station 100. When station 100 includes multiple transmit and receive modules, each transmit and receive module may be implemented as an independent element or multiple modules may be integrated into a single chip.

[0073] Next, the user interface unit 140 includes various types of input / output devices disposed in the station 100. That is, the user interface unit 140 can receive user input by using various input devices, and the processor 110 can control the station 100 based on the received user input. In addition, the user interface unit 140 can execute outputs based on commands from the processor 110 by using various output devices.

[0074] Next, the display unit 150 outputs an image on the display screen. The display unit 150 can output various display objects based on control commands from the processor 110, such as content executed by the processor 110 or a user interface. Additionally, the memory 160 stores the control program used in the station 100 and data obtained from various results. The control program may include the access program required for the station 100 to connect to an AP or an external station.

[0075] The processor 110 of the present invention can execute various commands or programs and process data in station 100. Additionally, the processor 110 can control corresponding units of station 100 and control data transmission / reception between these units. According to an embodiment of the present invention, the processor 110 can execute a program for accessing an AP stored in memory 160 and receive communication configuration messages sent by the AP. Furthermore, the processor 110 can read information about priority conditions of station 100 included in the communication configuration messages and request access to the AP based on the information about the priority conditions of station 100. The processor 110 of the present invention can represent the main control unit of station 100, and according to this embodiment, the processor 110 can represent a control unit for individually controlling a component of station 100 (e.g., transceiver 120, etc.). The processor 110 can be a modulator and / or demodulator that modulates wireless signals transmitted to transceiver 120 and demodulates wireless signals received from transceiver 120. The processor 110 controls various operations of wireless signal transmission / reception of station 100 according to an embodiment of the present invention. Detailed embodiments thereof will be described below.

[0076] Figure 3 The station 100 illustrated herein is a block diagram according to an embodiment of the present invention, wherein individual blocks are illustrated as logically separated elements of the device. Therefore, depending on the device design, the elements of the device can be installed in a single chip or multiple chips. For example, the processor 110 and transceiver 120 can be integrated into a single chip or implemented as separate chips. Additionally, in embodiments of the present invention, some components of the station 100, such as the user interface unit 140 and the display unit 150, can optionally be provided in the station 100.

[0077] Figure 4 This is a block diagram illustrating the configuration of AP 200 according to an embodiment of the present invention.

[0078] like Figure 4 As illustrated, the AP 200 according to an embodiment of the present invention may include a processor 210, a transceiver 220, and a memory 260. Figure 4 In the AP 200 components, the terms related to... will be omitted. Figure 2 Repeated descriptions of the same or corresponding parts of the components of station 100.

[0079] refer to Figure 4 The AP 200 according to the invention includes a transceiver 220 for operating a BSS in at least one frequency band. For example... Figure 3As described in the embodiments, the transceiver 220 of AP 200 may also include multiple transmit and receive modules using different frequency bands. That is, AP 200 according to embodiments of the present invention may together include two or more transmit and receive modules in different frequency bands (e.g., 2.4 GHz, 5 GHz, and 60 GHz). Preferably, AP 200 may include transmit and receive modules using 6 GHz or higher frequency bands and transmit and receive modules using 6 GHz or lower frequency bands. The corresponding transmit and receive modules can perform wireless communication with the station according to the wireless LAN standard of the frequency band supported by the corresponding transmit and receive modules. Transceiver 220 may operate only one transmit and receive module at a time or operate multiple transmit and receive modules simultaneously, depending on the performance and requirements of AP 200.

[0080] Next, memory 260 stores the control program used in AP 200 and data obtained from various results. The control program may include an access program for managing station access. Additionally, processor 210 can control corresponding units of AP 200 and control data transmission / reception between these units. According to an embodiment of the invention, processor 210 can execute a program for accessing stations stored in memory 260 and send communication configuration messages for one or more stations. In this case, the communication configuration message may include information about access priority conditions for the corresponding station. Furthermore, processor 210 performs access configuration according to the station's access request. Processor 210 may be a modulator and / or demodulator that modulates wireless signals transmitted to transceiver 220 and demodulates wireless signals received from transceiver 220. Processor 210 controls various operations such as the radio signal transmission / reception of AP 200 according to a first embodiment of the invention. Detailed embodiments thereof will be described below.

[0081] Figure 5 This is a schematic diagram illustrating the process of setting up the link between the STA and the AP.

[0082] refer to Figure 5 The link between STA 100 and AP 200 is generally set up through three steps: scanning, authentication, and association. First, the scanning step is where STA 100 obtains access information from the BSS operated by AP 200. Methods for performing the scan include a passive scanning method where AP 200 obtains information by periodically sending beacon messages (S101), and an active scanning method where STA 100 sends a probe request to AP (S103) and obtains access information by receiving a probe response from AP (S105).

[0083] STA 100, having successfully received wireless access information during the scanning step, performs the authentication step by sending an authentication request (S107a) and receiving an authentication response from AP 200 (S107b). After the authentication step is performed, STA 100 performs the association step by sending an association request (S109a) and receiving an association response from AP 200 (S109b).

[0084] Simultaneously, an 802.1X-based authentication step (S111) and an IP address acquisition step via DHCP can be additionally performed. Figure 5 In this context, authentication server 300 is a server that processes 802.1X-based authentication for STA 100 and can exist in physical association with AP 200 or as a standalone server.

[0085] In a specific embodiment, AP 200 can be a wireless communication terminal that allocates communication media resources and performs scheduling in an independent network (such as an ad hoc network) not connected to an external distribution service. Furthermore, AP 200 can be at least one of a base station, eNB, and transmission point TP. TP 200 can also be referred to as a base station communication terminal.

[0086] According to embodiments of the present invention, a wireless communication terminal can use data units as data processing units at each layer to send and receive data. Specifically, the wireless communication terminal can generate MAC Protocol Data Units (MPDUs) in the Media Access Control (MAC) layer and Physical Protocol Data Units (PPDUs) in the physical layer. Furthermore, the wireless communication terminal receiving data can receive PPDUs and obtain MPDUs from them. Through this operation, the wireless communication terminal can increase the reliability and efficiency of data transmission. For ease of explanation, the wireless communication terminal sending data is referred to as the initiator, and the wireless communication terminal receiving data is referred to as the receiver. The initiator can aggregate multiple MPDUs to generate an aggregated MAC Protocol Data Unit (A-MPDU) including multiple MPDUs. The initiator can then send the generated A-MPDU to the receiver. (Refer to...) Figure 6-24 This describes the specific operation of wireless communication terminals associated with A-MPDU.

[0087] Figure 6 A method for generating Aggregated MAC Protocol Data Units (A-MPDUs) by a wireless communication terminal according to an embodiment of the present invention is shown.

[0088] A wireless communication terminal can generate an A-MPDU as described above and send it to the receiver. Specifically, the wireless communication terminal can insert multiple MPDUs with the same TID to generate an A-MPDU. This improves transmission efficiency. Specifically, the wireless communication terminal can improve transmission efficiency by reducing the number of channel access contention processes required for data transmission. The wireless communication terminal can insert delimiters indicating information about the MPDUs and insert one or more MPDUs to generate an A-MPDU. The A-MPDU can be divided into Pre-EOF padding and EOF padding. In this case, the delimiter may include an EOF field indicating the end of the Pre-EOF padding portion included in the A-MPDU. Furthermore, the EOF field may indicate that the MPDU request corresponding to the delimiter does not include an ACK for the BA bitmap. Additionally, the delimiter may include an MPDU length field indicating the length of the MPDU. Furthermore, the delimiter may include a CRC field indicating the CRC value used for error detection of the delimiter. Additionally, the delimiter may include a delimiter signature field indicating the pattern used to detect the delimiter. The wireless communication terminal inserts a delimiter into the A-MPDU with an EOF field value of 0 and an MPDU length field value of non-zero, and then inserts an MPDU after the delimiter. The wireless communication terminal can insert one or more MPDUs and multiple delimiters indicating information about each of the one or more MPDUs into the A-MPDU to generate a Pre-EOF-filled A-MPDU. In this case, the inserted MPDU can be a data MPDU corresponding to a TID consistent with a block ACK. The wireless communication terminal can insert EOF padding after the Pre-EOF-filled A-MPDU. In this case, EOF padding can indicate one or more delimiters where the EOF field value is 1 and the MPDU length field value is 0. When the receiver detects a delimiter with an EOF field value of 1 and an MPDU length field value of 0, the receiver can determine that the A-MPDU transmission has ended.

[0089] When a wireless communication terminal transmits large amounts of data, it can improve transmission efficiency by using an A-MPDU. However, the receiver receiving the A-MPDU needs to respond to it by sending a block ACK (BA) frame including a BA bitmap. Therefore, it may be inefficient for the wireless communication terminal to use an A-MPDU to send an MPDU. Therefore, a receiver receiving a single MPDU (S-MPDU) that includes an A-MPDU can respond to the A-MPDU by sending an ACK frame instead of a BA frame to the initiator. Specifically, regardless of the BA convention for an MPDU, the receiver can respond to the A-MPDU by sending an ACK frame instead of a BA frame to the initiator. Additionally, in the delimiter preceding the MPDU, the initiator can set the EOF field to 1 and the MPDU length field to a non-zero value. Furthermore, when the EOF field of the delimiter included in the received A-MPDU is 1 and the MPDU length field is 0, the receiver can determine that the received A-MPDU is an S-MPDU. Additionally, the initiator can insert EOF padding after the MPDU in the S-MPDU.

[0090] exist Figure 6 In embodiment (a), the wireless communication terminal aggregates multiple MPDUs with a TID of 2 with multiple delimiters (Pre-EOF padding) indicating information about each of the multiple MPDUs to generate an A-MPDU. At this time, the MPDU is located after the delimiter indicating the information of the corresponding MPDU. Additionally, the wireless communication terminal inserts EOF padding. Figure 6 In embodiment (b), the wireless communication terminal aggregates an MPDU with a TID of 2 and a delimiter (Pre-EOF padding) indicating information about the corresponding MPDU to generate an S-MPDU. At this time, the EOF field of the delimiter has a value of 1, and the MPDU length field is not 0. Furthermore, the wireless communication terminal inserts EOF padding into the S-MPDU. (See reference...) Figure 7 This will describe in detail the operations of the initiator sending an A-MPDU and the receiver sending a response to the A-MPDU.

[0091] Figure 7 A method for transmitting block Ack(BA) frames for A-MPDU by a wireless communication terminal according to an embodiment of the present invention is shown.

[0092] As described above, a wireless communication terminal can generate an A-MPDU by combining MPDUs that share only the same Service Identifier (TID). In another specific embodiment, the wireless communication terminal can combine multiple MPDUs with different TIDs to generate multiple A-MPDUs. For ease of explanation, an A-MPDU comprising multiple MPDUs corresponding to multiple different TIDs is referred to as a multi-TID A-MPDU or an A-MPDU with multiple TIDs. This allows the wireless communication terminal to improve the transmission efficiency of A-MPDUs. Furthermore, the wireless communication terminal can use Physical Layer Protocol Data Units (HE PPDUs) to transmit A-MPDUs with multiple TIDs. In this case, the HE PPDU can be an HE Multi-User (MU) PPDU. Additionally, the HE PPDU can be an HE-triggered PPDU.

[0093] Wireless communication terminals can set parameters related to A-MPDU and BA frame transmission during link establishment. Specifically, wireless communication terminals can send maximum number of TIDs information during link establishment, indicating the maximum number of TIDs the terminal can simultaneously receive. This can be done using the HE capability information element, which indicates the terminal's capabilities. This is because as the number of TIDs in an A-MPDU with multiple TIDs increases, higher processing power from the receiving wireless communication terminal may be required. The maximum number of TIDs information can be the maximum number of TIDs in the TID field of the HE capability information element. The maximum number of TIDs information sent by the AP to non-AP wireless communication terminals can indicate the maximum number of TIDs that the MPDU included in the uplink (UL) A-MPDU sent by the corresponding non-AP wireless communication terminal can have. Additionally, the maximum number of TIDs information sent by non-AP wireless communication terminals to the AP can indicate the maximum number of TIDs that the downlink (DL) A-MPDU sent by the corresponding AP can have. During link establishment, wireless communication terminals can also send maximum number of TIDs information using management frames. At this time, the management frame can be at least one of a probe request frame, a probe response frame, an authentication request frame, an authentication response frame, an association request frame, an association response frame, and a beacon frame. Furthermore, when the AP uses a beacon frame to send maximum TID information, this maximum TID information can indicate the number of TIDs the AP can receive simultaneously. Specifically, when the AP uses a beacon frame to send maximum TID information, this maximum TID information can indicate the maximum number of TIDs allowed to be sent in a MU UL transmission, rather than the maximum number of TIDs that an MPDU can have, including those sent from any wireless communication terminal to the AP's A-MPDU. This is because the AP sends beacon frames to all wireless communication terminals of the BSS operated by the AP. In another specific embodiment, the maximum TID information of the beacon frame can be used for other purposes. In another specific embodiment, the maximum number of TIDs in the beacon frame's TID field can be a reserved field.

[0094] During link establishment, the wireless communication terminal can receive an all-accept (ALL ACK) from the receiver and send an all-accept capability indicator indicating whether the wireless communication terminal can process the all-accept. At this time, an all-accept indicates that the receiver can accept ACKs included in an A-MPDU sent by an initiator or in all MPDUs included in multiple TID A-MPDUs sent by an initiator. When sending an all-accept, the initiator may not have information about the segment sent from the all-accept. To process the all-accept, the initiator must store information about the segment sent by the initiator. This is because, depending on the capability, the initiator may not be able to store information about the segment sent by the initiator. Specifically, the wireless communication terminal can use the HE capability information element to send an all-accept capability indicator indicating whether to process the all-accept.

[0095] A wireless communication terminal can segment and transmit at least one of a MAC Service Data Unit (MSDU), an Aggregate (A)-MSDU, and a Management Protocol Data Unit (MMPDU). For ease of explanation, a portion of an MSDU, an A-MSDU, or an MMPDU generated through segmentation is referred to as a fragment. Furthermore, the wireless communication terminal transmitting the data is referred to as the initiator, and the wireless communication terminal receiving the data is referred to as the receiver.

[0096] Specifically, a wireless communication terminal can generate multiple segments using at least one of segmented MSDU, A-MSDU, and MMPDU. The wireless communication terminal then transmits the generated segments to multiple MPDUs. Alternatively, the wireless communication terminal receiving the multiple segments can reassemble them to obtain at least one of an MSDU, an A-MSDU, and an MMPDU. In this case, the MPDU can be either an S-MPDU or an A-MPDU.

[0097] The receiver requires sufficient buffer capacity and processing power to reassemble multiple segments. Specifically, the receiver is required to store all segments until it receives all segments corresponding to the MSDU with the same sequence number. Therefore, when the receiver supports the ability to receive segments, the initiator can send segments to the receiver. Finally, the initiator needs to know the segmentation levels supported by the receiver. The wireless communication terminal can signal the segmentation levels. Specifically, during link establishment with the AP, the wireless communication terminal sends information about the segmentation levels of segments that the wireless communication terminal can receive, and receives information about the segmentation levels of segments that the AP can receive. Specifically, the wireless communication terminal can use the HE capability information element to send information about the segmentation levels. At this time, the HE capability information element can indicate the capabilities of the wireless communication terminal. In addition, the wireless communication terminal can use at least one of the following: probe request frame, probe response frame, authentication request frame, authentication response frame, association request frame, and association response frame to send information about the segmentation levels.

[0098] As described above, the HE capability information element may include a field for the maximum number of TIDs, a full ACK capability indicator, and information indicating the segmentation level supported by the wireless communication terminal (segmentation support level).

[0099] Furthermore, the wireless communication terminal can set BA parameters during the Add Block ACK (ADDBA) process. In this case, BA parameters are used for BA frame transmission and reception. The wireless communication terminal can use an ADDBA request frame to request ACK in the form of a BA frame. Additionally, the wireless communication terminal can use an ADDBA response frame to send a response to the ADDBA request frame. Both the ADDBA request frame and the ADDBA response frame can include block Ack parameter set elements. In this case, the block Ack parameter set elements include information about the BA parameters. Furthermore, the wireless communication terminal can set BA parameters for each TID. Specifically, the wireless communication terminal can negotiate BA parameter settings for each TID. In a specific embodiment, the wireless communication terminal can use the TID field included in the block Ack parameter set element to specify the TID as the subject of BA parameter setting negotiation. The initiator can request BA parameter setting by sending an ADDBA request frame. The receiver can receive the ADDBA request frame and send an ADDBA response frame for the ADDBA request frame to determine the BA parameter setting. When the initiator receives the ADDBA response frame and sends an ACK frame for the ADDBA response frame, both the initiator and the receiver can set the BA parameters.

[0100] The wireless communication terminal can send buffer size information, which indicates the number of MPDUs that the terminal can store from the time data is received during the ADDBA process until the BA frame is sent. Specifically, the terminal can send the buffer size information using block Ack parameter set elements during the ADDBA process. The terminal can set the length of the BA bitmap based on the range of values ​​that the buffer size information can have. Specifically, when the buffer size information can have values ​​between 1 and X, the terminal can set the length of the BA bitmap to X bits. In this case, if the terminal fails to receive information about the length of the BA bitmap, it can also set the length to X bits.

[0101] When an AP performs a DL transmission to a wireless communication terminal, the AP can send an A-MPDU based on the capabilities of the wireless communication terminal signaled during link establishment and the BA parameters set during the ADDBA process. At this time, the wireless communication terminal can send a BA frame or a multi-STA block ACK (M-BA) frame to the AP based on the AP's capabilities and the BA parameters set during the ADDBA process.

[0102] When an AP receives A-MPDUs from multiple wireless communication terminals simultaneously, it may be difficult to store the multiple MPDUs received by the AP in a buffer and maintain a scoreboard. In this case, the scoreboard indicates information about the reception status of each MPDU recorded by the AP. Therefore, the AP can use a trigger frame to indicate the maximum number of TIDs that each wireless communication terminal can send for the A-MPDU. Specifically, the AP can use the user information field of the trigger frame to indicate the maximum number of TIDs to be sent by the wireless communication terminal corresponding to the user information field. The wireless communication terminal receiving the trigger frame can then set the number of TIDs that the A-MPDU can have based on the trigger frame. Specifically, the wireless communication terminal receiving the trigger frame can set the number of TIDs of the MPDUs included in the A-MPDU to be sent based on the maximum number of TIDs indicated by the trigger frame, and send the A-MPDU to the AP. For example, the wireless communication terminal receiving the trigger frame can set the number of TIDs of the MPDUs included in the A-MPDU to be sent to not exceed the maximum number of TIDs indicated by the trigger frame, and send the A-MPDU to the AP.

[0103] Furthermore, in SU transmission, the wireless communication terminal can transmit A-MPDUs with multiple TIDs. Specifically, when the wireless communication terminal uses HE MU PPDUs in single-user (SU) uplink (UL) transmission, the transmission of A-MPDUs with multiple TIDs can be restricted. The wireless communication terminal can use HE MU PPDUs in SU UL transmission with a relatively wide transmission range in a narrow frequency band. In this case, allowing the wireless communication terminal to transmit A-MPDUs including A-MPDUs with multiple TIDs may raise fairness issues regarding competition with other wireless communication terminals. Therefore, when the wireless communication terminal uses HE MU PPDUs in SU UL transmission, the transmission of A-MPDUs with multiple TIDs can be restricted. (Reference) Figures 8 to 15 This will describe the specific operations of the initiator and receiver associated with multi-TID A-MPDU.

[0104] As described above, when the receiver receives data with BA (Balanced Access) protocol, it can maintain a scoreboard that records the received data for each TID and AID. When the receiver receives a BAR (Browser Receiver) frame requesting the transmission of a BA frame, it must transmit the BA frame based on the data reception record in the scoreboard within a predetermined time. This predetermined time can be SIFS (Single-Instantaneous File System). For efficient processing, the receiver can implement the scoreboard as a single-chip memory. Furthermore, the receiver can record multiple BA sessions on a single scoreboard. Therefore, when the AP simultaneously receives A-MPDUs from multiple wireless communication terminals, maintaining the scoreboard becomes difficult as the number of wireless communication terminals increases. Therefore, the AP can limit the number of TIDs for MPDUs transmitted by the wireless communication terminals participating in UL MU (Universal MU) transmission.

[0105] The AP can use triggering information to indicate the maximum number of TIDs that each wireless communication terminal can have for the A-MPDU to be transmitted. In this case, the triggering information can be at least one of the UL MU Response Scheduling (UL MU RS) information and the MAC header included in the trigger frame. Figures 8 to 12 This will describe the operation of the AP, indicating the maximum number of A-MPDU TIDs that will be sent by each wireless communication terminal using a trigger frame.

[0106] Figure 8 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to an embodiment of the present invention.

[0107] The AP can use a trigger frame to indicate information about the types of MPDUs included in the A-MPDU to be sent to the AP by the wireless communication terminal. As described above, the AP can use a trigger frame to indicate the maximum number of TIDs that the A-MPDU sent to the AP by the wireless communication terminal can have. Specifically, the AP can use the user information field of the trigger frame to indicate the maximum number of TIDs to be sent by the wireless communication terminal corresponding to the user information field. In a specific embodiment, the AP can use the TID aggregation limit of the user information field of the trigger frame to indicate the maximum number of TIDs to be sent by the wireless communication terminal corresponding to the user information field. In this case, the wireless communication terminal receiving the trigger frame can set the number of TIDs that the A-MPDU can have based on the trigger frame. Specifically, the wireless communication terminal receiving the trigger frame can set the number of TIDs of the MPDUs included in the A-MPDU to be sent based on the maximum number of TIDs indicated by the trigger frame, and send the A-MPDU to the AP. For example, the wireless communication terminal receiving the trigger frame can set the number of TIDs of the MPDUs included in the A-MPDU to be sent, which does not exceed the maximum number of TIDs indicated by the trigger frame, and send the A-MPDU to the AP. Thus, the AP can effectively manage the scoreboard. Additionally, the BA bitmap length of each of multiple wireless communication terminals can be adjusted.

[0108] In a specific embodiment, the value of the TID aggregation limit field can indicate the maximum number of TIDs that the wireless communication terminal receiving the trigger frame can have when sending an A-MPDU to the AP. For example, when the TID aggregation limit field is a 3-bit field with values ​​from 0 to 7, each of the values ​​0 to 7 can indicate that the maximum number of TIDs of the A-MPDU to be sent to the AP corresponds to any one of 1 to 8.

[0109] In another specific embodiment, the AP can use a trigger frame to indicate that the wireless communication terminal indicated in the trigger frame is not allowed to generate an A-MPDU to be sent to the AP by aggregating MPDUs with TIDs. Specifically, the AP can set the TID aggregation limit to 0 to indicate that the wireless communication terminal indicated in the trigger frame is not allowed to generate an A-MPDU to be sent to the AP by aggregating MPDUs with that TID. However, when the A-MPDU includes an MPDU that requests an immediate response even if the MPDU does not have a TID, the size of the BA frame sent by the receiver in response to the A-MPDU can be increased. Furthermore, this increases the burden on the scoreboard managing the receiver. In this case, an immediate response can instruct the receiver to send a response to the initiator within a predetermined time period in the same transmission opportunity (TXOP). Specifically, the predetermined time period can be a short interframe interval (SIFS).

[0110] In another specific embodiment, the AP can use a trigger frame to instruct the wireless communication terminal indicated by the trigger frame not to generate an A-MPDU to be sent to the AP by aggregating MPDUs requesting immediate response. In this case, the MPDU requesting immediate response may include an MPDU with Quality of Service (QoS) data having a TID. Additionally, the MPDU requesting immediate response may include a Management MPDU requesting immediate response (MMPDU). Specifically, the MPDU requesting immediate response may include an action frame. The AP sets the value of the TID aggregation limit field of the user information field in the trigger frame to 0 to indicate that the wireless communication terminal corresponding to the user information field is not allowed to generate an A-MPDU to be sent to the AP by aggregating MPDUs requesting immediate response. When the TID aggregation limit field value indicates a value other than 0, it can indicate the maximum number of TIDs that the A-MPDU to be sent to the AP by the wireless communication terminal indicated by the trigger frame can have. Furthermore, when the trigger frame indicates that the wireless communication terminal is not allowed to generate an A-MPDU to be sent to the AP by aggregating MPDUs requesting immediate response, the wireless communication terminal can generate an A-MPDU to be sent to the AP by aggregating MPDUs that do not request immediate response. Specifically, when the TID aggregation limit field value of the user information field of the wireless communication terminal corresponding to the trigger frame is 0, the wireless communication terminal can generate an A-MPDU to be sent to the AP by aggregating MPDUs that do not request an immediate response. In a specific embodiment, the MPDU that does not request an immediate response may include an MPDU that includes QoS data with an ACK policy set to no ACK. When the ACK policy is set to no Ack, the ACK policy may indicate that no ACK is requested for the corresponding frame. In addition, the MPDU that does not request an immediate response may include a QoS empty frame. In this case, the QoS empty frame may be a QoS empty frame with the ACK policy set to no Ack. In addition, the MPDU that does not request an immediate response may include an action no Ack frame.

[0111] In another specific embodiment, the AP can use a trigger frame to instruct the wireless communication terminal indicated by the trigger frame to aggregate MPDUs (without TID quantity limit) to generate an A-MPDU, and send the generated A-MPDU to the AP. Specifically, the AP sets the value of the TID aggregation limit field of the user information field in the trigger frame to 7 to instruct the wireless communication terminal corresponding to the user information field to aggregate MPDUs (without TID quantity limit) to generate an A-MPDU, and send the generated A-MPDU to the AP.

[0112] exist Figure 8In this embodiment, the AP sets the value of the TID aggregation limit field of the user information field of the third station corresponding to the trigger frame to 3, indicating that the maximum number of TIDs to be sent to the AP by the third station STA3 for A-MPDU is 3. The third station STA3 determines the number of TIDs to be sent to the AP for A-MPDU based on the value of the TID aggregation limit field of the user information field of the third station corresponding to the trigger frame. Specifically, the third station STA3 determines the number of TIDs to be sent to the AP to be 3 based on the value of the TID aggregation limit field of the user information field of the third station corresponding to the trigger frame. The third station STA1 aggregates MPDUs with TID 1, MPDUs with TID 2, MPDUs with TID 3, action frames, and QoS empty frames to generate A-MPDUs to be sent to the AP. The third station STA3 sends the generated A-MPDU to the AP. The AP sends an M-BA frame to multiple wireless communication terminals, including the third station STA3, based on the A-MPDU received from the third station STA3. In this embodiment, the AP adjusts the duration of the M-BA frame. Figure 8 In this embodiment, the third station STA3 considers MPDUs without TIDs, such as QoS empty frames and action frames, as not included in the number of TIDs indicated by the maximum number of TIDs. However, when there is no BA agreement for a specific TID, the response to an MPDU with the corresponding TID may not affect the M-BA frame. Furthermore, as mentioned above, an immediate response can be requested even for MPDUs that do not correspond to a specific TID. Therefore, a specific embodiment is needed for comparing the number of TIDs with the maximum number of TIDs of the A-MPDUs to be sent by the wireless communication terminal to the AP. (Refer to...) Figures 9 to 12 Let me describe it in detail.

[0113] Figure 9 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to another embodiment of the present invention.

[0114] The AP can use trigger frames to indicate the maximum number of TIDs with BA conventions that an A-MPDU sent by the wireless communication terminal can have. The wireless communication terminal can calculate the number of TIDs of the A-MPDU based on the number of TIDs with BA conventions. In the above embodiment, when the wireless communication terminal compares the number of TIDs of the A-MPDU to be sent to the AP with the maximum number of TIDs, the wireless communication terminal can compare the number of TIDs with BA conventions with the maximum number of TIDs. Specifically, when the wireless communication terminal compares the number of TIDs of the A-MPDU to be sent to the AP with the maximum number of TIDs, the wireless communication terminal may not count TIDs without BA conventions as part of the number of TIDs of the A-MPDU. This is because since the receiver directly sends the data corresponding to TIDs without BA conventions to the upper layer without storing the data corresponding to those TIDs in the buffer, the reception of data corresponding to TIDs without BA conventions may not affect the management of the scoreboard. Furthermore, this is because when the wireless communication terminal counts TIDs without BA conventions as part of the number of TIDs, buffer management and A-MPDU configuration can be restricted. Specifically, when the value of the TID aggregation limit field is between 1 and 6, the wireless communication terminal can generate an A-MPDU with a number of TIDs with BA conventions that are less than or equal to the value of the TID aggregation limit field, and can send the generated A-MPDUs to the AP. At this time, regardless of the value of the TID aggregation limit field, the wireless communication terminal can add MPDUs corresponding to TIDs without BA conventions to the A-MPDU. Further, the AP sets the value of the TID aggregation limit field of the per-user information field in the trigger frame to 0 to indicate that the wireless communication terminal corresponding to the per-user information field is allowed to aggregate MPDUs that do not request an immediate response, regardless of the TIDs with BA conventions, to generate A-MPDUs and send the generated A-MPDUs to the AP. Specifically, when the TID aggregation limit field value of the user information field of the wireless communication terminal corresponding to the trigger frame is 0, the wireless communication terminal can generate an A-MPDU to be sent to the AP by aggregating MPDUs that do not request an immediate response.

[0115] exist Figure 9In this embodiment, the AP sets the value of the TID aggregation limit field in the user information field of the third station corresponding to the trigger frame to 3, indicating that the maximum number of TIDs with BA agreements that the A-MPDU will send to the AP by the third station STA3 is 3. The third station STA3 determines the number of TIDs with BA agreements to be sent to the AP for the A-MPDU based on the value of the TID aggregation limit field in the user information field of the third station corresponding to the trigger frame. The third station STA3 determines that the A-MPDU to be sent to the AP has three TIDs with BA agreements based on the value of the TID aggregation limit field in the user information field of the third station corresponding to the trigger frame. BA agreements exist for TIDs 1, 2, and 4, and no BA agreement exists for TID 5. Therefore, the third station STA1 aggregates the MPDU with TID 1, the MPDU with TID 2, the MPDU with TID 3, the MPDU with TID 5, the frame without Ack action, and the QoS empty frame to generate the A-MPDU to be sent to the AP. The third station STA3 sends the generated A-MPDU to the AP. The AP transmits M-BA frames to multiple wireless communication terminals, including the third station STA3, based on the A-MPDU received from the third station SAT3. In this embodiment, the AP adjusts the duration of the M-BA frames.

[0116] Data corresponding to TIDs without BA conventions can also request ACK frame transmission. In this case, the receiver can respond to the MPDU corresponding to a TID without BA conventions by sending an M-BA frame including a Per AID TID field that does not contain a BA bitmap. Therefore, even though the MPDU corresponding to a TID without BA conventions affects the duration of the M-BA frame, the maximum number of TIDs that an A-MPDU can have can be calculated based on the number of TIDs requesting immediate response and the number of frames with TIDs not requesting immediate response. (See reference...) Figure 10 To describe in more detail.

[0117] Figure 10 The operation of a wireless communication terminal transmitting A-MPDU based on the maximum number of TIDs is illustrated according to another embodiment of the present invention.

[0118] The AP can use trigger frames to limit the number of MPDUs requesting immediate response that can be included in an A-MPDU sent by the wireless communication terminal. The wireless communication terminal can calculate the number of TIDs for the A-MPDU based on the number of TIDs requesting immediate response. In the above embodiment, when the wireless communication terminal compares the number of TIDs for the A-MPDU to be sent to the AP with the maximum number of TIDs, the wireless communication terminal can compare the number of TIDs requesting immediate response to the A-MPDU with the maximum number of TIDs. When the wireless communication terminal compares the number of TIDs for the A-MPDU to be sent to the AP with the maximum number of TIDs, it can calculate the number of TIDs for the A-MPDU without considering MPDUs that do not request immediate response. Therefore, regardless of the maximum number of TIDs, the wireless communication terminal can aggregate MPDUs corresponding to TIDs that do not request immediate response. Furthermore, regardless of the maximum number of TIDs, the wireless communication terminal can aggregate frames that do not have TIDs that do not request immediate response. Furthermore, the number of TIDs requesting immediate response can be the sum of the number of frames with TIDs requesting immediate response not included in the A-MPDU and the number of frames with TIDs requesting immediate response included in the A-MPDU. The number of frames without TIDs can indicate the type of frames without TIDs. Additionally, an action frame with TID 15 in each AID TID field of the M-BA frame can be one of the frames without a TID requesting immediate response. The MPDU corresponding to a TID that does not request immediate response can be the MPDU corresponding to a TID whose ACK policy is set to no Ack. Furthermore, the MPDU corresponding to a TID that does not request immediate response can be a QoS empty frame. In this case, the ACK policy for a QoS empty frame can be no Ack. Furthermore, a frame without a TID that does not request immediate response can be an action frame without Ack.

[0119] As described above, the AP sets the TID aggregation limit field of the per-user information in the trigger frame to 0, indicating that the wireless communication terminal corresponding to the per-user information field is allowed to aggregate MPDUs that do not request an immediate response, regardless of the TID with BA agreement, to generate an A-MPDU, and then sends the generated A-MPDU to the AP. Specifically, when the TID aggregation limit field of the user information field of the wireless communication terminal corresponding to the trigger frame is 0, the wireless communication terminal can generate an A-MPDU to be sent to the AP by aggregating MPDUs that do not request an immediate response.

[0120] exist Figure 10In this embodiment, the AP sets the value of the TID aggregation limit field in the user information field of the third station corresponding to the trigger frame to 3, indicating that the maximum sum of the number of TIDs that the A-MPDU sent by the third station STA3 to the AP can have and the number of frames that do not request an immediate response to be included in the A-MPDU is 3. The third station STA3 determines the sum of the number of TIDs requesting an immediate response to the A-MPDU to be sent to the AP and the number of frames that do not request an immediate response, based on the value of the TID aggregation limit field in the user information field of the third station corresponding to the trigger frame. The third station STA3 determines the sum of the number of TIDs requesting an immediate response to the A-MPDU to be sent to the AP and the number of frames that do not request an immediate response to be 3, based on the value of the TID aggregation limit field in the user information field of the third station corresponding to the trigger frame. TIDs 1 and 2 request an immediate response, and TIDs 4 and 5 set the ACK policy to no ACK. Furthermore, the action frame requests an immediate response. Therefore, the third station STA1 aggregates the MPDU with TID 1, MPDU with TID 2, MPDU with TID 4, MPDU with TID 5, action frames, action frames without Ack, and QoS empty frames to generate an A-MPDU to be sent to the AP. The third station STA3 sends the generated A-MPDU to the AP. Based on the A-MPDU received from the third station STA3, the AP sends the M-BA frame to multiple wireless communication terminals, including the third station STA3. In this embodiment, the AP adjusts the duration of the M-BA frame.

[0121] Figure 11 The operation of a wireless communication terminal transmitting an A-MPDU based on the maximum number of TIDs is illustrated according to another embodiment of the present invention.

[0122] A multi-TID A-MPDU may not include multiple action frames. Therefore, a multi-TID A-MPDU can include only one action frame. Furthermore, when an A-MPDU includes an additional action frame, the length of the M-BA frame increases by two octets. Therefore, the change in M-BA duration due to adding an action frame to the A-MPDU is negligible. Moreover, it can be seen that action frames are more important than QoS data frames.

[0123] When a wireless communication terminal compares the number of TIDs in an A-MPDU to be sent to the AP with the maximum number of TIDs, the wireless communication terminal may not include the number of action frames in the calculation of the number of TIDs in the A-MPDU. Specifically, when the value of the TID aggregation limit field is within a predetermined range, the wireless communication terminal can generate an A-MPDU to be sent to the AP by aggregating action frames, regardless of the value of the TID aggregation limit field. Figures 8 to 10In some embodiments, the wireless communication terminal may not calculate the number of action frames as the number of TIDs of the A-MPDU.

[0124] exist Figure 11 In this embodiment, the AP sets the TID aggregation limit field of the user information field of the third station corresponding to the trigger frame to 2, indicating that the maximum value of the sum of the number of TIDs that the A-MPDU sent to the AP by the third station STA3 can have and the number of frames with TIDs that do not request immediate response, excluding action frames, included in the A-MPDU, is 3. At this time, action frames are excluded from the maximum value calculation. The third station STA3 determines the sum of the number of TIDs requesting immediate response and the number of frames with TIDs that do not request immediate response, excluding action frames, included in the A-MPDU, based on the value of the TID aggregation limit field of the user information field of the third station corresponding to the trigger frame. The third station STA3 determines that the A-MPDU to be sent to the AP has two TIDs requesting immediate response. TIDs 1 and 2 request immediate response, while TIDs 4 and 5 have an ACK policy set to no ACK. Furthermore, action frames are excluded from the count. Therefore, the third station STA1 aggregates the MPDU with TID 1, MPDU with TID 2, MPDU with TID 4, MPDU with TID 5, action frames, action frames without Ack, and QoS empty frames to generate an A-MPDU to be sent to the AP. The third station STA3 sends the generated A-MPDU to the AP. Based on the A-MPDU received from the third station STA3, the AP sends the M-BA frame to multiple wireless communication terminals, including the third station STA3. Through this embodiment, the AP adjusts the duration of the M-BA frame.

[0125] The AP can use trigger information to instruct the wireless communication terminal sending a response to the trigger information to perform channel sensing before sending the response. Specifically, the AP can set the request CS field value of the trigger information to instruct the wireless communication terminal responding to the trigger information to perform channel sensing before sending the response. The request CS field indicates whether channel sensing is required when the wireless communication terminal sends a response to the trigger information. In this case, when the value of the request CS field is 1, the request CS field can indicate that channel sensing is required. Additionally, when sending a response to the trigger information, the wireless communication terminal receiving the trigger information can determine whether to perform channel sensing based on the request CS field of the trigger information. Specifically, when the value of the request CS field of the trigger information is 1, the wireless communication terminal receiving the trigger information can perform channel sensing when sending a response to the trigger information. In this case, channel sensing can indicate whether the channel sending the response to the trigger information is idle. Furthermore, channel sensing can instruct CCA operation.

[0126] Figure 12 The operation of setting the maximum number of TIDs for a trigger frame in a wireless communication terminal according to an embodiment of the present invention is illustrated.

[0127] When an AP triggers an immediate response to data transmission using trigger information, the AP can use the trigger information to indicate that channel sensing is not required when the wireless communication terminal sends a response to the trigger information. Specifically, when the AP triggers an immediate response to data transmission using trigger information and the value of the length field of the common information field of the trigger information is less than or equal to a predetermined value, the AP can use the trigger information to indicate that channel sensing is not required when the wireless communication terminal sends a response to the trigger information. In this case, the length field indicates information about the length of the trigger-based PPDU. Specifically, the length field can indicate information about the length of the trigger-based PPDU. Additionally, the predetermined value can be 418 bytes. In this way, the AP can prevent the wireless communication terminal sending a response to the trigger information from not sending an immediate response due to channel sensing. However, there is a problem with the operation of the wireless communication terminal sending both the response to the trigger information and data simultaneously. This is because when a wireless communication terminal operating in EDCA sends data, it may be required to send data after performing channel sensing. Furthermore, this is because when the wireless communication terminal sending a response to the trigger information sends an MPDU requesting an immediate response, an additional transmission sequence is required.

[0128] When channel sensing is not required when the wireless communication terminal indicated by the trigger frame sends a response to the trigger information, the AP can use the trigger frame to instruct the wireless communication terminal indicated by the trigger frame not to aggregate MPDUs requesting immediate response to generate an A-MPDU and to send the generated A-MPDU. Specifically, when channel sensing is not required when the wireless communication terminal indicated by the trigger frame sends a response to the trigger information, the AP can set the value of the TID aggregation limit field of the user information field of the trigger frame to 0 to instruct the wireless communication terminal corresponding to the user information field not to aggregate MPDUs requesting immediate response to generate an A-MPDU. Specifically, when the AP triggers an immediate response to data transmission using the trigger information and the value of the length field of the common information field of the trigger information is less than or equal to a predetermined value, it can instruct the wireless communication terminal indicated by the trigger frame not to aggregate MPDUs requesting immediate response to generate an A-MPDU and to send the generated A-MPDU. In these embodiments, the wireless communication terminal can aggregate MPDUs that do not request immediate response to generate an A-MPDU and send the generated A-MPDU to the AP.

[0129] exist Figure 12In this embodiment, the AP sends an HE MU PPDU to multiple stations. The HE MU PPDU includes a trigger frame requesting an immediate response to the data MPDU included in the HE MU PPDU. Furthermore, the length field of the common information field of the trigger frame has a value of 418. Additionally, the request CS bit of the trigger frame is set to 0. Therefore, the AP sets the TID aggregation limit field of the user information field of the trigger frame to 0. The wireless communication terminals receiving the trigger frame together send a response to the data MPDU included in the HE MU PPDU and an A-MPDU including an MPDU that does not request an immediate response. At this time, the length field of the trigger frame that triggers the trigger-based PPDU (HE TB PPDU) including the A-MPDU has a value less than or equal to 418. Therefore, the first station sends an A-MPDU including an MPDU containing a BA frame and data with an ACK policy of no Ack. The second station sends an A-MPDU including a BA frame and an Ack-free action frame. The third and fourth stations send A-MPDUs including a BA frame and a QoS empty frame.

[0130] pass Figure 7-12 The operation of the AP using a trigger frame to trigger the transmission of A-MPDU by the wireless communication terminal has already been described. As mentioned above, the AP can use the MAC header to trigger the wireless communication terminal to send a trigger-based PPDU to the AP. Specifically, the AP can insert trigger information into the HE variable HT control field of the MAC header to trigger the wireless communication terminal to send a trigger-based PPDU to the AP. In this case, the trigger information included in the MAC header is called the UL MU Response Scheduler (UL MU RS). Figure 13-15 This will describe the operation of the AP-triggered wireless communication terminal using UL MU RS to send a trigger-based PPDU including an A-MPDU.

[0131] Figure 13 The operation of a wireless communication terminal transmitting an A-MPDU based on a UL MU RS according to an embodiment of the present invention is described.

[0132] Because the UL MU RS is included in the MAC header, the size of the fields used by the UL MU RS can be limited. Specifically, the UL MU RS is identified by a 4-bit control ID field in the HE variable HT control field, and a 26-bit field can be used to indicate trigger information. Additionally, the UL MU RS can trigger the transmission of ACK / BA frames for the payload included in the MAC frame that includes the UL MU RS. Furthermore, the UL MU RS can trigger transmissions by the wireless communication terminal corresponding to the receiver address in the MAC frame that includes the UL MU RS. In these embodiments, the UL MU RS can include less information than the trigger frame. Therefore, the UL MU RS may not include the maximum number of TIDs. The wireless communication terminal receiving the MAC frame that includes the UL MU RS can transmit a trigger-based PPDU (TB PPDU) within the UL PPDU length indicated by the UL MU RS. Therefore, the wireless communication terminal receiving the MAC frame that includes the UL MU RS can generate an A-MPDU to be sent to the AP, regardless of the number of TIDs that the A-MPDU can have.

[0133] exist Figure 13 In this embodiment, the AP sends a HE MUPPDU including a data MPDU for each of the first station STA1 to the third station STA3 and a broadcast trigger frame. At this time, the MAC header of the data MPDU for each of the first station STA1 to the third station STA3 includes a UL MU RS. Each of the first to third stations STA1 to STA3 generates an A-MPDU including an ACK / BA, a data MPDU, and an MPDU based on the UL MU RS. Each of the first to third stations STA1 to STA3 uses the HE MUPPDU to send the generated A-MPDU to the AP. The first station STA1 aggregates the ACK / BA frame, the MPDU corresponding to each of the multiple TIDs, and the MMPDU to generate the A-MPDU.

[0134] When a wireless communication terminal receiving a MAC frame including UL MU RS sends an A-MPDU to the AP with a total number of TIDs exceeding the total number of TIDs that the AP can receive, the AP may be unable to receive the A-MPDU or may malfunction. Therefore, a method is needed to prevent this situation.

[0135] Figure 14 The operation of a wireless communication terminal transmitting an A-MPDU based on a UL MU RS according to another embodiment of the present invention is described.

[0136] As described above, a wireless communication terminal receiving UL MU RS can generate an A-MPDU including an ACK / BA frame. The wireless communication terminal receiving UL MU RS can use the information indicated by the UL MU RS to send the generated A-MPDU to the AP. At this time, the MPDU that the wireless communication terminal receiving UL MU RS can aggregate with the ACK / BA frame can be limited to at least one of an MPDU corresponding to a TID and an MMPDU. Therefore, the wireless communication terminal receiving UL MU RS can generate an A-MPDU by aggregating the ACK / BA frame with at least one of an MPDU corresponding to a TID and an MMPDU. At this time, the M-BA frame sent by the AP can include up to two BA information fields for each wireless communication terminal. This is because the MMPDU in the M-BA frame is considered to have a TID of 1111. Figure 14 In this embodiment, the AP sends the HE MU PPDU to the first station STA1 to the third station STA3, such as Figure 13 The implementation is the same. In this case, the first station STA1 sends the A-MPDU to the AP based on the UL MU RS included in the MAC frame sent to the first station STA1. Figure 14 In embodiment (a), the first station STA1 aggregates the ACK / BA frame, the MPDU corresponding to TID 3, and the MMPDU to generate the A-MPDU.

[0137] In another specific embodiment, the MPDU that the wireless communication terminal receiving the UL MU RS can aggregate with the ACK / BA frame can be limited to either the MPDU corresponding to a TID or the MMPDU. Therefore, the wireless communication terminal receiving the UL MU RS can generate an A-MPDU by aggregating the ACK / BA frame with either the MPDU corresponding to a TID or the MMPDU. In this case, the M-BA frame sent by the AP can include at most one BA information field per wireless communication terminal. Figure 14 In embodiment (b) of the above, the first station STA1 aggregates ACK / BA frames and MPDUs corresponding to TID 3 to generate A-MPDU.

[0138] In another specific embodiment, the wireless communication terminal receiving the UL MU RS can limit the MPDU aggregated with the ACK / BA frame to at least one of the MMPDU and the MPDU corresponding to a high-priority TID. Therefore, the wireless communication terminal receiving the UL MU RS can generate an A-MPDU by aggregating any one of the ACK / BA frame, the MMPDU, and the MPDU with the high-priority MPDU. In this case, the TID with the high priority selection can indicate a TID with a higher priority than a certain priority. Specifically, a priority can be specified by the AP. In a specific embodiment, the AP can specify a priority during the link establishment process. For example, the AP can specify a priority by using at least one of the beacon frame, the association response frame, and the authentication response frame. Figure 14 In embodiment (c), the first station STA1 generates an A-MPDU by aggregating ACK / BA frames, MPDUs with a TID corresponding to a priority higher than a certain priority, and MMPDUs.

[0139] In another specific embodiment, the wireless communication terminal receiving the UL MU RS can limit the MPDU aggregated with the ACK / BA frame to an MMPDU. Therefore, the wireless communication terminal receiving the UL MU RS can aggregate the ACK / BA frame and the MMPDU to generate an A-MPDU. Figure 14 In embodiment (d), the first station STA1 aggregates ACK / BA frames and MPDUs corresponding to TID 3 to generate A-MPDUs.

[0140] In addition, the wireless communication terminal receiving UL MU RS can aggregate ACK / BA frames and MPDUs corresponding to TIDs without BA agreements, and is not limited to the above embodiments.

[0141] In another specific embodiment, the wireless communication terminal receiving the UL MU RS can limit the MPDU aggregated with the ACK / BA frame to an MPDU that does not request an immediate response. Therefore, the wireless communication terminal receiving the UL MU RS can aggregate the ACK / BA frame and the MPDU that does not request an immediate response to generate an A-MPDU. Figure 14 In embodiment (e), the first station STA1 aggregates ACK / BA frames and MPDUs that do not request an immediate response to generate an A-MPDU. This embodiment prevents the wireless communication terminal from increasing the transmission sequence.

[0142] In another specific embodiment, the wireless communication terminal receiving the UL MU RS can send an A-MPDU including an ACK / BA frame without aggregating the ACK / BA frame with another MPDU. This allows the wireless communication terminal to maximize the reliability of ACK / BA frame transmission.

[0143] Figure 15 The operation of a wireless communication terminal transmitting an A-MPDU based on a UL MU RS according to another embodiment of the present invention is described.

[0144] When transmitting UL MU RS, the AP can signal restrictions on the aggregation of ACK / BA frames and other MPDUs transmitted based on UL MU RS. Specifically, the AP will signal the restriction on the aggregation of ACK / BA frames and other MPDUs transmitted based on UL MU RS by setting the UL MU RS bit to 0. When UL MU RS indicates restrictions on the aggregation of ACK / BA frames and other MPDUs transmitted based on UL MU RS, the wireless communication terminal receiving UL MU RS can refer to the reference... Figure 14 The various embodiments described generate an A-MPDU including an ACK / BA frame. Specifically, when the UL MU RS indicates a restriction on the aggregation of ACK / BA frames and other MPDUs, the wireless communication terminal receiving the UL MU RS can send an A-MPDU including an ACK / BA frame to the AP without aggregating it with another MPDU. In another specific embodiment, when the UL MU RS indicates a restriction on the aggregation of ACK / BA frames and other MPDUs, the wireless communication terminal receiving the UL MU RS can send an A-MPDU including an ACK / BA frame and an MPDU that does not request an immediate response to the AP.

[0145] exist Figure 15 In this embodiment, the AP sets the value of the allow aggregation field included in the UL MU RS to indicate restrictions on the aggregation of ACK / BA frames and MPDUs transmitted based on the UL MU RS. When the value of the allow aggregation field is 0, the first station STA1 sends an A-MPDU including an ACK / BA frame and a padded A-MPDU to the AP. Furthermore, when the value of the allow aggregation field is 1, the first station STA1 sends an A-MPDU to the AP including an ACK / BA frame, an MPDU with TID 1, and an MMPDU. This embodiment allows for modification of the form of the A-MPDU transmitted based on the UL MU RS.

[0146] When the Received Signal Strength Indication (RSSI) differs significantly between MU PPDUs transmitted by multiple wireless communication terminals, the AP may have difficulty receiving MU PPDUs correctly from these terminals. Therefore, the AP can use triggering information to adjust the transmission power of the MU PPDUs transmitted by each of the multiple wireless communication terminals. (See reference...) Figures 16 to 23 To describe.

[0147] Figure 16An AP according to an embodiment of the present invention is shown to use a trigger frame to signal the transmission power of the trigger frame to multiple wireless communication terminals, and the multiple wireless communication terminals adjust the transmission power of the MU PPDU based on the transmission power of the trigger frame.

[0148] The magnitude of path loss during transmission varies depending on the location of the wireless communication terminal. In this context, path loss indicates the attenuation of the signal strength as it is transmitted along a specific path. Figure 16 In this context, the second station STA2 is farther from the AP than the first station STA1, and the path loss PL2 generated during the transmission between the second station STA2 and the AP is greater than the path loss PL1 generated during the transmission between the first station STA1 and the AP. Therefore, in order to adjust the RSSI of the MU PPDU received by the AP to the RSSI specified by the AP, the wireless communication terminal must calculate the path loss occurring in the transmission path from the wireless communication terminal to the AP. For this purpose, the AP can insert information about the transmission power used to transmit the PPDU including trigger information into the trigger information. Specifically, the AP can insert the transmission power into at least one of the trigger frame and the UL MU RS. In this case, the RSSI specified by the AP is called the target RSSI. In addition, the transmission power used to transmit the PPDU including trigger information is called the DL TX power. For example, the AP can insert information about the DL TX power into the common information field of the trigger frame, such as... Figure 16 As shown. Additionally, the AP can insert information about the target RSSI into the trigger-related information field of the per-user information field in the trigger frame, such as... Figure 16 As shown. Additionally, the AP can insert information about the DL TX power into the HE variable HT control field, such as... Figure 16 As shown. Additionally, the AP can insert information about the target RSSI into the HE variable HT control field, such as... Figure 16 As shown.

[0149] The wireless communication terminal can obtain information about the DL TX power based on trigger information received from the AP. The wireless communication terminal can then assess the path loss occurring in the transmission path between the wireless communication terminal and the AP based on the RSSI of the PPDU, which includes the DL TX power and the trigger information. Specifically, the wireless communication terminal can assess the path loss occurring in the transmission path between the wireless communication terminal and the AP by subtracting the RSSI of the PPDU, which includes the trigger information, from the DL TX power based on the trigger information. Figure 16 As shown. Specifically, the DL TX power can be displayed in the trigger information in 20MHz units.

[0150] The wireless communication terminal can measure the RSSI of the PPDU in the physical layer and obtain information about the DL TX power and the target RSSI included in the trigger information from the MAC layer. At this point, the wireless communication terminal pre-measures the RSSI and, based on the information about the DL TX power and the target RSSI obtained in the MAC layer, determines the transmission power of the triggered PPDU. Specifically, the wireless communication terminal bases its measurement on information such as... Figure 16 The RSSI and DL TX powers shown are added to the target RSSI by the path loss occurring in the transmission path between the AP and the wireless communication terminal to determine the transmission power (target UL TX power) based on the triggered PPDU. The wireless communication terminal uses the determined transmission power to transmit the triggered PPDU.

[0151] Even with the same PPDU, the amount of power allocated can vary depending on frequency and time. Therefore, the path loss estimation occurring in the transmission between the AP and the wireless communication terminal may become inaccurate, depending on the method used by the wireless communication terminal to measure the RSSI of the PPDU including trigger information. Specifically, when transmitting a PPDU including trigger information over a bandwidth of 80 MHz or higher and the center 26 resource element (RU) is located at the center of the 80 MHz bandwidth, the center 26 RU is situated at the center of two consecutive 20 MHz bands. Specifically, the center 26 RU can be an indicator RU comprising subcarriers corresponding to indices from -16 to -4 and from 4 to 16, and seven DC subcarriers located at the center of the band. Therefore, the question arises as to which band's RSSI should the wireless communication terminal receiving the PPDU payload via the center 26 RU measure. (Refer to...) Figure 17-23 This describes a method for a wireless communication terminal to measure the RSSI of a MU PPDU. In this case, the MU PPDU may include the triggering information described above.

[0152] Figure 17 An embodiment of the present invention illustrates a method for a wireless communication terminal to measure the RSSI of a MU PPDU.

[0153] A wireless communication terminal can measure the RSSI of a conventional preamble of a PPDU transmitted on a main channel with a bandwidth of 20MHz as the RSSI of the PPDU. In this case, the conventional preamble indication can be obtained not only by the wireless communication terminal according to an embodiment of the invention but also by a conventional wireless communication terminal that can decode the preamble. Specifically, the wireless communication terminal can measure the RSSI of a conventional training field of a PPDU transmitted on a main channel with a bandwidth of 20MHz as the RSSI of the PPDU. In a specific embodiment, the wireless communication terminal can measure the RSSI of a conventional long training field (L-LTF) transmitted on a main channel with a bandwidth of 20MHz as the RSSI of the PPDU. In another specific embodiment, the wireless communication terminal can measure the average of the RSSI of the L-LTF and the RSSI of a conventional short training field (L-STF) transmitted on a main channel with a bandwidth of 20MHz as the RSSI of the PPDU. In this case, L-LTF represents a long training signal, which is a training signal with a relatively long signal length. Specifically, the wireless communication terminal can estimate the frequency offset and the channel including the OFDM symbol with the L-SIG field based on the LTF. Furthermore, L-STF represents a short training signal, which is a training signal with a relatively short length. Specifically, the wireless communication terminal can perform automatic gain control (AGC) on OFDM symbols including L-LTF and L-SIG fields based on L-STF. Furthermore, the wireless communication terminal can synchronize timing and frequency with OFDM symbols including the L-SIG field based on L-STF. The wireless communication terminal adjusts the transmission power based on the RSSI of the PPDU measured through the above embodiments.

[0154] exist Figure 17 In this embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth, including a 26RU at the center, to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet extension PE. At this time, the multiple wireless communication terminals measure the RSSI of the L-STF and L-LTF transmitted through a main channel with a 20MHz bandwidth. Based on the measured RSSI and DL TX power, the multiple wireless communication terminals estimate the path loss occurring in the transmission from the AP to each of the multiple wireless communication terminals. The multiple wireless communication terminals can obtain the DL TX power from the trigger frame or the ULMU RS. The multiple wireless communication terminals determine the transmission power based on the trigger-based PPDU based on the estimated path loss and the target RSSI. The multiple wireless communication terminals transmit the trigger-based PPDU to the AP according to the trigger frame or information indicated by the ULMU RS.

[0155] Regardless of the location of the RU to which the payload received by the wireless communication terminal is sent, the wireless communication terminal detects the main channel with a bandwidth of 20MHz. Furthermore, in the case of a conventional preamble, the PPDU can be transmitted at the same power within the same frequency band. Therefore, when the wireless communication terminal measures the RSSI of the PPDU based on a conventional preamble transmitted through a 20MHz frequency band, the wireless communication terminal can effectively measure the RSSI of the PPDU. Additionally, the wireless communication terminal receiving the PPDU payload through the central 26 RU can also accurately measure the RSSI of the PPDU. Moreover, the wireless communication terminal can measure the RSSI of the PPDU in the same manner when receiving trigger frames transmitted in the form of non-HT PPDUs.

[0156] Figure 18 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal according to another embodiment of the present invention is shown.

[0157] The wireless communication terminal can measure the RSSI of the PPDU across the entire frequency band of the transmitted PPDU. Specifically, the wireless communication terminal can average the RSSI measured across the entire frequency band of the transmitted PPDU in 20MHz units. Specifically, the wireless communication terminal can measure the RSSI of the conventional preamble as the RSSI of the PPDU across the entire frequency band of the transmitted PPDU. However, unlike the payload of the PPDU transmitted using 256FFT, the conventional preamble is transmitted using 64FFT. Therefore, when the wireless communication terminal measures the RSSI of the PPDU based on the conventional preamble, errors may occur accordingly.

[0158] Wireless communication terminals can measure the RSSI of a PPDU based on a non-traditional training field. The wireless communication terminal can measure the RSSI of the non-traditional training field as the RSSI of the PPDU across the entire frequency band of the transmitted PPDU. Specifically, the wireless communication terminal can measure the RSSI of the PPDU based on a value obtained by averaging the RSSI of the non-traditional training field across the entire frequency band of the transmitted PPDU in 20MHz bandwidth units. In a specific embodiment, the wireless communication terminal subtracts the value obtained by averaging the RSSI of the non-traditional training field across the entire frequency band of the transmitted PPDU from the DL TX power obtained from the trigger information, thereby estimating the path loss in the transmission path between the wireless communication terminal and the AP. In these embodiments, the wireless communication terminal can obtain information about the bandwidth of the PPDU signaled to the MU PPDU to measure the RSSI of the non-traditional training field across the entire frequency band of the transmitted PPDU. Furthermore, the non-traditional training field can be a non-traditional long training field. The wireless communication terminal can estimate the frequency offset and channel of OFDM symbols, including non-traditional signaling fields and payloads, based on the non-traditional long training field. Specifically, the wireless communication terminal can estimate the channel for transmitted data based on a non-traditional long training field. Furthermore, the wireless communication terminal can estimate the frequency offset of OFDM symbols based on a non-traditional long training field. Additionally, the wireless communication terminal can perform automatic gain control (AGC) on OFDM symbols, including non-traditional long training fields, non-traditional signaling fields, and payloads, based on short training signals. Furthermore, the wireless communication terminal can perform timing and frequency synchronization on OFDM symbols, including non-traditional long training fields, non-traditional signaling fields, and payloads, based on non-traditional short training fields.

[0159] exist Figure 18 In this embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth, including a 26RU at the center, to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet extension PE. At this time, the multiple wireless communication terminals cross-correlate the HE-LTF, which is a non-traditional long training field, to measure the RSSI of the HE-LTF. Based on the measured RSSI and DL TX power, the multiple wireless communication terminals estimate the path loss occurring in the transmission from the AP to each of the multiple wireless communication terminals. Other operations of the multiple wireless communication terminals can be related to... Figure 17 The operations described in the embodiments are the same.

[0160] However, when the AP uses OFDMA to transmit HE MU PPDUs, the AP can set the transmission power differently for each RU. Specifically, when the AP uses OFDMA to transmit HE MU PPDUs, the AP can set the transmission power differently for each RU from the HE-STF, which is a non-traditional short training field. Particularly, the frequency selectivity of each RU has a greater impact when using 256FFT. (See reference...) Figure 19 Describe an RSSI measurement method that takes into account the difference in transmission power for each RU.

[0161] Figure 19 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal according to another embodiment of the present invention is shown.

[0162] The wireless communication terminal can measure the RSSI of a non-traditional training field as the RSSI of the PPDU in the RU that transmits the PPDU payload, corresponding to the wireless communication terminal. In this case, the non-traditional training field can be HE-LTF, which is a non-traditional long training field. Furthermore, the RU that transmits the PPDU payload can instruct the RU that transmits a trigger frame to trigger the wireless communication terminal or the UL MU RS. Specifically, when the bandwidth of the RU that transmits the PPDU payload is less than 20MHz, the wireless communication terminal can scale the measured RSSI in 20MHz increments.

[0163] exist Figure 19 In this embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth, including a 26RU at the center, to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet spread PE. The multiple wireless communication terminals then cross-correlate the HE-LTF to measure the RSSI of the HE-LTF in the RU that transmits the payload for each of the multiple wireless communication terminals. Based on the measured RSSI and DL TX power, the multiple wireless communication terminals estimate the path loss occurring in the transmission from the AP to each of the multiple wireless communication terminals. Here, when the bandwidth of the RU is less than 20MHz, the measured RSSI value can be scaled in 20MHz increments. Other operations of the multiple wireless communication terminals can be combined with... Figure 17 The operations described in the embodiments are the same.

[0164] In this embodiment, when the bandwidth of the RU transmitting the payload corresponding to the PPDU of the wireless communication terminal is too narrow, the number of sample symbols that the wireless communication terminal can use to measure RSSI may be too small. Therefore, the accuracy of the RSSI measured by the wireless communication terminal may be reduced.

[0165] Figure 20 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal according to another embodiment of the present invention is shown.

[0166] The wireless communication terminal can measure the RSSI of a non-traditional training field as the RSSI of a PPDU in a frequency with a 20MHz bandwidth including the payload of the PPDU transmitted through it, corresponding to the wireless communication terminal. In this case, the non-traditional training field can be a HE-LTF as a non-traditional long training field. Furthermore, the RU transmitting the payload of the PPDU through it can indicate the RU transmitting a trigger frame to trigger the wireless communication terminal or the UL MU RS.

[0167] exist Figure 20 In this embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth, including 26 RUs at the center, to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet spread PE. The multiple wireless communication terminals then cross-correlate the HE-LTF to measure the RSSI of the HE-LTF in a band having a 20MHz bandwidth, including the RUs transmitting payloads for each of the multiple wireless communication terminals. Based on the measured RSSI and DL TX power, the multiple wireless communication terminals estimate the path loss occurring in the transmission from the AP to each of the multiple wireless communication terminals. Here, when the bandwidth of the RU is less than 20MHz, the measured RSSI value can be scaled in 20MHz increments. Other operations of the multiple wireless communication terminals can be... Figure 17 The operations described in the embodiments are the same.

[0168] In these embodiments, there may be a question of in which frequency band a wireless communication terminal receiving the payload of a PPDU via the central 26RU should measure the RSSI of non-traditional signaling fields.

[0169] Figure 21 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal according to another embodiment of the present invention is shown.

[0170] In the above embodiment, when a wireless communication terminal receives the payload of a PPDU through the central 26RU, the wireless communication terminal can measure the RSSI of a non-traditional signaling field in the frequency band in which it transmits SIG-B content channel signaling information about the central 26RU. Specifically, the HE-SIG-B signaling field signals information about multiple wireless communication terminals receiving the HE MU PPDU. Specifically, the information about the multiple wireless communication terminals may include information about resource allocation. At this time, the information about resource allocation may include information about the RUs receiving the payload of the HE MU PPDU from the multiple wireless communication terminals. The AP transmits an HE-SIG-B field including different information for each 20MHz frequency band. Specifically, when the AP transmits the HE MU PPDU through a frequency band with a bandwidth of 40MHz or higher, the AP repeatedly transmits a first SIG-B content channel with a bandwidth of 20MHz and a second SIG-B content channel with a bandwidth of 20MHz for every 40MHz. At this time, the AP transmits information about the central 26RU with a bandwidth of 80MHz through the first SIG-B content channel. Additionally, the AP transmits information about the 26RU at the center of a sub-channel with an 80MHz bandwidth via the second SIG-B content channel. Therefore, when the wireless communication terminal receives the payload of the PPDU via the 26RU at the center of the main channel with an 80MHz bandwidth, the wireless communication terminal can measure the RSSI of non-traditional signaling fields in the frequency band of the first SIG-B content channel. Furthermore, when the wireless communication terminal receives the payload of the PPDU via the 26RU at the center of the sub-channel with an 80MHz bandwidth, the wireless communication terminal can measure the RSSI of non-traditional signaling fields in the frequency band of the second SIG-B content channel. Additionally, the non-traditional training field can be HE-LTF, which is a non-traditional long training field.

[0171] exist Figure 21In this embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth, including a central 26RU, to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet extension PE. Meanwhile, the wireless communication terminal receiving the payload via the central 26RU measures the RSSI of the HE-LTF by cross-correlating it in a 20MHz bandwidth channel where the first SIG-B content is transmitted. Based on the measured RSSI and DL TX power, the wireless communication terminal estimates the path loss occurring in the transmission from the AP to the wireless communication terminal. Additionally, the wireless communication terminal can obtain the DL TX power from a trigger frame or UL MU RS. Multiple wireless communication terminals determine the transmission power based on the trigger-based PPDU based on the estimated path loss and target RSSI. Multiple wireless communication terminals transmit the trigger-based PPDU to the AP according to the trigger frame or information indicated by the UL MU RS.

[0172] When a wireless communication terminal measures the RSSI of a non-traditional signaling field in the frequency band of the SIG-B content channel that transmits information about the 26RU at the center, the wireless communication terminal can obtain the HE-SIG-B field and measure the RSSI in the same frequency band. However, a drawback is that the payload received by the wireless communication terminal is not transmitted in the frequency band where the wireless communication terminal measures the RSSI.

[0173] Figure 22 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal according to another embodiment of the present invention is shown.

[0174] In the above embodiments, when the wireless communication terminal receives the payload of the PPDU through the central 26RU, the wireless communication terminal can measure the RSSI of the non-traditional signaling field in the frequency band of the SIG-B content channel that transmits signals to inform about the central 26RU, within two frequency bands with a 20MHz bandwidth including the central 26RU. In another specific embodiment, the wireless communication terminal can measure the RSSI of the non-traditional signaling field in two frequency bands with a 20MHz bandwidth including the central 26RU. In this case, the wireless communication terminal can average the RSSI measured in 20MHz units. Furthermore, the non-traditional training field can be HE-LTF, which is a non-traditional long training field.

[0175] exist Figure 22In one embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth including the center 26RU to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet extension PE. At this time, the wireless communication terminal receiving the payload through the center 26RU measures the RSSI of the HE-LTF by cross-correlating it in the band closest to the first SIG-B content channel among two frequency bands with a 20MHz bandwidth including the center 26RU. In another specific embodiment, the wireless communication terminal receiving the payload through the center 26RU measures the RSSI of the HE-LTF by cross-correlating it in the bands with a 20MHz bandwidth including the center 26RU, and averages the RSSI over 20MHz units. Other operations of the wireless communication terminals can be... Figure 21 The operations described in the embodiments are the same.

[0176] Figure 23 A method for measuring the RSSI of a MU PPDU by a wireless communication terminal according to another embodiment of the present invention is shown.

[0177] The AP can be restricted from sending trigger information through the central 26RU. Specifically, the AP can send trigger information without going through the central 26RU. Specifically, the AP can send trigger frames without going through the central 26RU. Additionally, the AP can send UL MU RS without going through the central 26RU. This is because the central 26RU is only used when the bandwidth exceeds 80MHz, and the size occupied by the central 26RU is small across the entire frequency band.

[0178] exist Figure 23 In this embodiment, the AP transmits an HE MU PPDU with an 80MHz bandwidth, including a central 26RU, to multiple wireless communication terminals. The HE MU PPDU includes L-STF, L-LTF, L-SIG, RL-SIG, HE-SIG-A, HE-SIG-B, HE-STF, HE-LTF, payload data, and packet extension PE. In this case, the AP transmits the payload of the PPDU, excluding trigger information, through the central 26RU. In this embodiment, the AP can prevent problems that may occur when a wireless communication terminal receiving the payload of the PPDU through the central 26RU measures the RSSI of non-traditional signaling fields.

[0179] Figure 24 The operation of a wireless communication terminal according to an embodiment of the present invention is illustrated.

[0180] The base station wireless communication terminal 2401 sends trigger information to one or more wireless communication terminals 2403 (S2401). At this time, the trigger information can be the aforementioned trigger frame or UL MU RS.

[0181] The triggering information is a trigger frame, and the trigger frame may include a first signaling field, which indicates information about the type of MPDU included in the A-MPDU. At this time, when the wireless communication terminal 2403 is not allowed to aggregate MPDUs requesting immediate response and generate an A-MPDU to be sent to the base station wireless communication terminal 2401, the base station wireless communication terminal 2401 may set the value of the first signaling field to a predetermined value. Furthermore, when the base station wireless communication terminal 2401 is allowed to use the wireless communication terminal corresponding to the first signaling field to aggregate MPDUs requesting immediate response and generate an A-MPDU to be sent to the base station wireless communication terminal 2401, the base station wireless communication terminal 2401 may set the value of the first signaling field according to the maximum number of TIDs that the A-MPDU can have. The maximum number of TIDs that the A-MPDU can have may indicate the maximum number of TIDs requesting immediate response that the A-MPDU can have. The maximum number of TIDs requesting immediate response may indicate the maximum value of the sum of the number of TIDs requesting immediate response and the number of frames without TIDs requesting immediate response. In another specific embodiment, the maximum number of TIDs that an A-MPDU can have can indicate the maximum number of TIDs with BA conventions.

[0182] In this case, an immediate response can instruct the receiver to send a response to the initiator within a predetermined time period in the same TXOP. Specifically, the predetermined time period can be a Short Interframe Space (SIFS). The MPDU corresponding to a TID that does not request an immediate response can be the MPDU corresponding to a TID with its ACK policy set to no Ack. Furthermore, the MPDU corresponding to a TID that does not request an immediate response can be a QoS empty frame. In this case, the ACK policy for a QoS empty frame can be no Ack. Additionally, frames with TIDs that do not request an immediate response can be frames with no Ack action.

[0183] The trigger frame may include a second signaling field indicating whether channel sensing is required when the wireless communication terminal 2403 sends a trigger-based PPDU. The base station wireless communication terminal 2401 may set the value of a first signaling field based on the value of the second signaling field. Specifically, when the second signaling field is set to indicate that channel sensing is not required for trigger-based PPDU transmission, the base station wireless communication terminal 2401 may set the value of the first signaling field to a predetermined value. The trigger frame may include a third signaling field indicating information about the length of the trigger-based PPDU. In this case, the base station wireless communication terminal may set the value of the first signaling field based on the value of the third signaling field. Specifically, when the value of the third signaling field is less than a predetermined length, the base station wireless communication terminal 2401 may set the value of the first signaling field to a predetermined value. The predetermined value is a value indicating that an MPDU responding immediately to an aggregation request may not generate an A-MPDU to be sent to the base station wireless communication terminal 2401.

[0184] The first signaling field can be the aforementioned TID aggregation limit field. Furthermore, the second signaling field can be the aforementioned required CS field. Additionally, the base station wireless communication terminal 2401 can be configured according to the reference... Figures 8 to 15 The described embodiment operates.

[0185] Wireless communication terminal 2403 transmits A-MPDU (2403) based on trigger information. Wireless communication terminal 2403 can determine whether to aggregate MPDUs requesting immediate response and generate an A-MPDU based on the trigger information. The trigger frame may include a signaling field indicating whether wireless communication terminal 2403 is allowed to aggregate MPDUs requesting immediate response and generate an A-MPDU to be sent to base station wireless communication terminal 2401. Wireless communication terminal 2403 can aggregate MPDUs requesting immediate response and generate an A-MPDU to be sent to base station wireless communication terminal 2401 based on the signaling field. When the value of the signaling field is a predetermined value, wireless communication terminal 2403 can generate an A-MPDU that does not include MPDUs requesting immediate response. Furthermore, when the value of the signaling field is within a predetermined range, the signaling field indicates the maximum number of TIDs that an A-MPDU can have when generating an A-MPDU to be sent to base station wireless communication terminal 2401 via wireless communication terminal 2403. Wireless communication terminal 2403 can generate an A-MPDU to be sent to base station wireless communication terminal 2401 based on the maximum number of TIDs. When the value of the signaling field is within a predetermined range, the wireless communication terminal 2403 can generate an A-MPDU by aggregating MPDUs that do not request an immediate response, regardless of the maximum number of TIDs that an A-MPDU can have. MPDUs that do not request an immediate response may include Quality of Service (QoS) empty frames that do not request an ACK for data transmission. Additionally, MPDUs that do not request an immediate response may include action frames without an ACK for data transmission. MPDUs that request an immediate response may include action frames. Furthermore, when the value of the signaling field is within a predetermined range, the wireless communication terminal 2403 can generate an A-MPDU by aggregating action frames, regardless of the maximum number of TIDs that an A-MPDU can have. The signaling field may be the aforementioned TID aggregation limit field. The predetermined value may be 0. The predetermined range may be 1 or greater. Additionally, the wireless communication terminal 2403 may use a reference... Figures 8 to 12 The same method is used in the embodiments described above.

[0186] When trigger information is included in the MAC header, the wireless communication terminal 2403 can generate an A-MPDU that does not include an MPDU requesting immediate response, as an A-MPDU to be sent to the base station wireless communication terminal 2401. At this time, the trigger information can be included in the HE variable HT control field of the MAC header. Specifically, the trigger information can be the aforementioned UL MU RS. In a specific embodiment, when trigger information is included in the MAC header, the wireless communication terminal 2403 can aggregate any one of the ACK frame and the block ACK (BA) frame with an MPDU that does not request immediate response, without any MPDU requesting immediate response, to generate an A-MPDU. At this time, the MPDU that does not request immediate response can include at least one of a QoS empty frame that does not request ACK for data transmission and a frame without ACK action that does not request ACK for data transmission. Specifically, the wireless communication terminal 2403 can, as in reference... Figures 13 to 15 Operate as described in the embodiments.

[0187] The wireless communication terminal 2403 can measure the RSSI of a PPDU including a trigger frame, and determine the transmission power of the triggered PPDU based on the measured signal strength. Specifically, the wireless communication terminal 2403 can measure the RSSI of a conventional preamble of a PPDU transmitted on a main channel with a bandwidth of 20 MHz as the RSSI of the PPDU. In this case, the conventional preamble indication can be obtained not only by the wireless communication terminal according to the embodiment of the present invention, but also by the preamble decoded by a conventional wireless communication terminal.

[0188] Furthermore, the wireless communication terminal 2403 can measure the RSSI of the PPDU across the entire frequency band of the transmitted PPDU. In this case, the wireless communication terminal 2403 can average the RSSI measured across the entire frequency band of the transmitted PPDU in 20MHz units. Specifically, the wireless communication terminal 2403 can measure the RSSI of the conventional preamble as the RSSI of the PPDU across the entire frequency band of the transmitted PPDU. The wireless communication terminal 2403 can also measure the RSSI of the PPDU based on non-conventional training fields.

[0189] Furthermore, the wireless communication terminal 2403 can measure the RSSI of the non-traditional training field as the RSSI of the PPDU across the entire frequency band of the transmitted PPDU. Specifically, the wireless communication terminal 2403 can measure the RSSI of the PPDU based on a value obtained by averaging the RSSI of the non-traditional training field across the entire frequency band of the transmitted PPDU in units of 20MHz bandwidth.

[0190] Additionally, the wireless communication terminal 2403 can measure the RSSI of non-traditional training fields as the RSSI of the PPDU in a frequency having a 20MHz bandwidth including the payload of the RU through which the PPDU is transmitted, corresponding to the wireless communication terminal. When the wireless communication terminal 2403 receives the payload of the PPDU through the central 26RU, the wireless communication terminal 2403 can measure the RSSI of non-traditional signaling fields in the frequency band of the SIG-B content channel in which information about the central 26RU is transmitted. When the wireless communication terminal 2403 receives the payload of the PPDU through the central 26RU, the wireless communication terminal 2403 can measure the RSSI of non-traditional signaling fields in the frequency band of the SIG-B content channel that transmits information about the central 26RU in two frequency bands having a 20MHz bandwidth including the central 26RU. In another specific embodiment, the wireless communication terminal 2403 can measure the RSSI of non-traditional signaling fields in two frequency bands having a 20MHz bandwidth including the central 26RU. In this case, the wireless communication terminal 2403 can average the RSSI measured in 20MHz units. In another specific embodiment, the base station wireless communication terminal 2401 can be restricted from sending trigger information through the central 26RU. Specifically, the base station wireless communication terminal 2401 can send trigger information without going through the central 26RU. Specifically, the base station wireless communication terminal 2401 can send trigger frames without going through the central 26RU. Specifically, the wireless communication terminal 2403 and the base station wireless communication terminal 2401 can be as described in the reference. Figures 16 to 23 Operate as described in the embodiments.

[0191] Although the invention has been described using wireless LAN communication as an example, it is not limited thereto and can be applied to other communication systems such as cellular communication. Furthermore, while the methods, apparatus, and systems of the invention have been described with reference to specific embodiments, some or all of the components or operations of the invention can be implemented using a computer system with a general-purpose hardware architecture.

[0192] The features, structures, and effects described in the above embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Furthermore, those skilled in the art can combine or modify the features, structures, and effects shown in each embodiment in other embodiments. Therefore, it should be understood that anything related to such combinations and modifications is included within the scope of the present invention.

[0193] While the present invention has been described primarily based on the embodiments described above, it is not limited thereto. Those skilled in the art will understand that various changes and modifications can be made without departing from the spirit and scope of the invention. For example, each component specifically shown in the embodiments can be modified and implemented. It should be understood that differences relating to such modifications and applications are included within the scope of the invention as defined by the appended claims.

Claims

1. A wireless communication terminal for wireless communication, the wireless communication terminal comprising: transceiver; as well as processor, The processor is configured to use the transceiver to receive trigger information from the base station wireless communication terminal. Based on the triggering information, determine whether to aggregate one or more MPDUs requesting an immediate response to generate an aggregated MAC protocol data unit (A-MPDU). The A-MPDU is generated based on the determination described above, and The A-MPDU is sent to the base station wireless communication terminal. in: When the triggering information is included in a trigger frame that includes a signaling field and the value of the signaling field is a predetermined value, the processor is configured to generate the A-MPDU that does not include one or more MPDUs requesting an immediate response, wherein the predetermined value is 0, and When the triggering information is included in the trigger frame that includes the signaling field and the value of the signaling field is within a predetermined range, the signaling field indicates the maximum number of TIDs that are allowed to be aggregated in the A-MPDU when the wireless communication terminal generates the A-MPDU, and the processor is configured to generate the A-MPDU based on the maximum number of TIDs. When the trigger information is included in the MAC header but not in the trigger frame, the processor is configured to generate the A-MPDU that does not include one or more MPDUs requesting an immediate response.

2. The wireless communication terminal according to claim 1, wherein, When the value of the signaling field is within the predetermined range, the wireless communication terminal is allowed to aggregate one or more MPDUs that do not request an immediate response, regardless of the maximum number of TIDs.

3. The wireless communication terminal according to claim 2, wherein, The one or more MPDUs that do not request an immediate response include QoS empty frames that do not request an ACK for a Quality of Service (QoS) empty frame.

4. The wireless communication terminal according to claim 2, wherein, The one or more MPDUs that do not request an immediate response include frames without an ACK action that do not request an ACK for a frame without an ACK action.

5. The wireless communication terminal according to claim 1, wherein, When the value of the signaling field is within a predetermined range, the processor is configured to aggregate action frames, regardless of the maximum number of TIDs allowed to be aggregated in the A-MPDU when the wireless communication terminal generates the A-MPDU.

6. The wireless communication terminal according to claim 1, wherein, When the triggering information is included in the MAC header but not in the triggering frame, the processor is configured to aggregate either the ACK frame and the block ACK (BA) frame with one or more MPDUs that do not request an immediate response, but not with one or more MPDUs that request an immediate response, to generate the A-MPDU.

7. The wireless communication terminal according to claim 6, wherein, The one or more MPDUs that do not request an immediate response include at least one of a QoS empty frame that does not request an ACK for a QoS empty frame and a frame without an ACK action that does not request an ACK for a frame without an ACK action.

8. A method for operating a wireless communication terminal to perform wireless communication, the method comprising: Receive trigger information from the base station wireless communication terminal. Based on the triggering information, determine whether to aggregate one or more MPDUs requesting an immediate response to generate an aggregated MAC protocol data unit (A-MPDU). The A-MPDU is generated based on the determination described above, and The A-MPDU is sent to the base station wireless communication terminal. The generation of the A-MPDU according to the determination includes: When the triggering information is included in a trigger frame that includes a signaling field and the value of the signaling field is a predetermined value, the A-MPDU is generated that does not include the one or more MPDUs requesting an immediate response, wherein the predetermined value is 0. When the triggering information is included in the trigger frame that includes the signaling field and the value of the signaling field is within a predetermined range, the signaling field indicates the maximum number of TIDs that are allowed to be aggregated in the A-MPDU when the wireless communication terminal generates the A-MPDU, and the A-MPDU is generated based on the maximum number of TIDs. When the triggering information is included in the MAC header but not in the trigger frame, the A-MPDU is generated that does not include the one or more MPDUs requesting an immediate response.

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