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EP-3562203-B1 - AGGREGATED-MPDU, METHOD FOR TRANSMITTING RESPONSE FRAME THERETO, AND WIRELESS COMMUNICATION TERMINAL USING SAME

EP3562203B1EP 3562203 B1EP3562203 B1EP 3562203B1EP-3562203-B1

Inventors

  • AHN, WOOJIN
  • SON, JUHYUNG
  • KO, Geonjung
  • KWAK, JINSAM

Dates

Publication Date
20260513
Application Date
20171221

Claims (12)

  1. A wireless communication terminal (100), the terminal comprising: a processor (110); and a communication unit (120), wherein the processor (110) is configured to: receive, through the communication unit (120), an aggregate MPDU, A-MPDU, consisting of one or more MAC protocol data units, MPDUs, wherein the A-MPDU includes MPDU delimiter information including an end of frame, EOF, field, a length field, a cyclic redundancy check, CRC, field, and an MPDU signature field, and at least one traffic ID, TID, related to the one or more MPDUs, and transmit, through the communication unit (120), a response frame of a specific format in response to the A-MPDU, wherein the specific format of the response frame for the A-MPDU is determined to be one of an Ack frame, a compressed BlockAck frame, and a multi-STA BlockAck frame based on the number of TIDs soliciting an immediate response in MPDUs successfully received in the A-MPDU and the MPDU delimiter information of the A-MPDU, and wherein the specific format of the response frame for the A-MPDU is determined to be the compressed BlockAck frame in response to the one or more MPDUs corresponding to one TID, when the MPDUs successfully received in the A-MPDU correspond to the one TID among the at least one TID.
  2. The wireless communication terminal (100) of claim 1, wherein when the one or more MPDUs include only one MPDU soliciting an immediate response, and the MPDU soliciting the immediate response follows the MPDU delimiter information with a value of the EOF field equal to 1 and a value of the length field not equal to 0, the response frame for the A-MPDU is determined to be an Ack frame.
  3. The wireless communication terminal (100) of claim 1, wherein when the one or more MPDUs include MPDUs of a plurality of TIDs soliciting an immediate response or include at least one MPDU of one or more TIDs soliciting an immediate response and an Action frame, the response frame for the A-MPDU is determined to be a multi-STA BlockAck frame.
  4. The wireless communication terminal (100) of claim 1, wherein when an MPDU in which an acknowledgment policy is set to HE TB PPDU, HTP, Ack is not present in the A-MPDU, the response frame is carried in an high efficiency single-user PHY protocol data unit, HE SU PPDU.
  5. The wireless communication terminal (100) of claim 1, wherein an acknowledgment policy of an MPDU included in the A-MPDU is set to HTP Ack, and wherein when the A-MPDU contains a trigger frame in which an address field is set to the address of the wireless communication terminal or the A-MPDU contains a QoS data frame or a QoS null frame in which an uplink multi-user response scheduling, UMRS, control field and the address field is set to the address of the wireless communication terminal, the response frame is carried in an high efficiency trigger-based PHY protocol data unit, HE TB PPDU.
  6. The wireless communication terminal (100) of claim 1, wherein the EOF field indicates whether to request the response frame in response to one of the one or more MPDUs through the combination with the length field, wherein the specific format is determined according to a number of a specific MPDU delimiter information having a value of the EOF field equal to 1 and a value of the length field not equal to 0, or whether a MPDU including the specific MPDU delimiter information is included in the A-MPDU, and wherein the response frame of the specific format is carried as a high efficiency single-user PHY protocol data unit, HE SU PPDU, based on an MPDU in which the ACK policy is set to HTP Ack.
  7. A wireless communication method of a wireless communication terminal (100), the method comprising: receiving an aggregate MPDU, A-MPDU, consisting of one or more MAC protocol data unit, MPDUs; wherein the A-MPDU includes MPDU delimiter information including an end of frame, EOF, field, a length field, a CRC field, and an MPDU signature field, and at least one traffic ID, TID, related to the one or more MPDUs; and transmitting a response frame of a specific format in response to the A-MPDU, wherein the specific format of the response frame for the A-MPDU is determined to be one of an Ack frame, a compressed BlockAck frame, and a multi-STA BlockAck frame based on the number of TIDs soliciting an immediate response in MPDUs successfully received in the A-MPDU and the MPDU delimiter information of the A-MPDU, and wherein the specific format of the response frame for the A-MPDU is determined to be the compressed BlockAck frame in response to the one or more MPDUs corresponding to one TID, when the MPDUs successfully received in the A-MPDU correspond to the one TID among the at least one TID.
  8. The wireless communication method of claim 7, wherein when the one or more MPDUs include only one MPDU soliciting an immediate response, and the MPDU soliciting the immediate response follows the MPDU delimiter information with a value of the EOF field equal to 1 and a value of the length field not equal to 0, the response frame for the A-MPDU is determined to be an Ack frame.
  9. The wireless communication method of claim 7, wherein when the one or more MPDUs include MPDUs of a plurality of TIDs soliciting an immediate response or include at least one MPDU of one or more TIDs soliciting an immediate response and an Action frame, the response frame for the A-MPDU is determined to be a multi-STA BlockAck frame.
  10. The wireless communication method of claim 7, wherein when an MPDU in which an acknowledgment policy is set to HE TB PPDU, HTP, Ack is not present in the A-MPDU, the response frame is carried in an high efficiency single-user PHY protocol data unit, HE SU PPDU.
  11. The wireless communication method of claim 7, wherein an acknowledgment policy of an MPDU included in the A-MPDU is set to HTP Ack, and wherein when the A-MPDU contains a trigger frame in which an address field is set to the address of the wireless communication terminal or the A-MPDU contains a QoS data frame or a QoS null frame in which an uplink multi-user response scheduling, UMRS, control field and the address field is set to the address of the wireless communication terminal, the response frame is carried in an high efficiency trigger-based PHY protocol data unit, HE TB PPDU.
  12. The wireless communication method of claim 7, wherein the EOF field indicates whether to request the response frame in response to one of the one or more MPDUs through the combination with the length field, wherein the specific format is determined according to a number of a specific MPDU delimiter information having a value of the EOF field equal to 1 and a value of the length field not equal to 0, or whether a MPDU including the specific MPDU delimiter information is included in the A-MPDU, and wherein the response frame of the specific format is carried as a high efficiency single-user PHY protocol data unit, HE SU PPDU, based on an MPDU in which the ACK policy is set to HTP Ack.

Description

[Technical Field] The present invention relates to a method for transmitting an aggregate MPDU and a response frame thereto and a wireless communication terminal using the same, and more particularly, to a wireless communication method and a wireless communication terminal for setting various formats of the aggregate MPDU and the response frame thereto and performing an efficient data communication by using the same. [Background Art] In recent years, with supply expansion of mobile apparatuses, a wireless LAN technology that can provide a rapid wireless Internet service to the mobile apparatuses has been significantly spotlighted. The wireless LAN technology allows mobile apparatuses including a smart phone, a smart pad, a laptop computer, a portable multimedia player, an embedded apparatus, and the like to wirelessly access the Internet in home or a company or a specific service providing area based on a wireless communication technology in a short range. Institute of Electrical and Electronics Engineers (IEEE) 802.11 has commercialized or developed various technological standards since an initial wireless LAN technology is supported using frequencies of 2.4 GHz. First, the IEEE 802.11b supports a communication speed of a maximum of 11 Mbps while using frequencies of a 2.4 GHz band. IEEE 802.11a which is commercialized after the IEEE 802.11b uses frequencies of not the 2.4 GHz band but a 5 GHz band to reduce an influence by interference as compared with the frequencies of the 2.4 GHz band which are significantly congested and improves the communication speed up to a maximum of 54 Mbps by using an OFDM technology. However, the IEEE 802.11a has a disadvantage in that a communication distance is shorter than the IEEE 802.11b. In addition, IEEE 802.11g uses the frequencies of the 2.4 GHz band similarly to the IEEE 802.11b to implement the communication speed of a maximum of 54 Mbps and satisfies backward compatibility to significantly come into the spotlight and further, is superior to the IEEE 802.11a in terms of the communication distance. Moreover, as a technology standard established to overcome a limitation of the communication speed which is pointed out as a weak point in a wireless LAN, IEEE 802.11n has been provided. The IEEE 802.11n aims at increasing the speed and reliability of a network and extending an operating distance of a wireless network. In more detail, the IEEE 802.11n supports a high throughput (HT) in which a data processing speed is a maximum of 540 Mbps or more and further, is based on a multiple inputs and multiple outputs (MIMO) technology in which multiple antennas are used at both sides of a transmitting unit and a receiving unit in order to minimize a transmission error and optimize a data speed. Further, the standard can use a coding scheme that transmits multiple copies which overlap with each other in order to increase data reliability. As the supply of the wireless LAN is activated and further, applications using the wireless LAN are diversified, the need for new wireless LAN systems for supporting a higher throughput (very high throughput (VHT)) than the data processing speed supported by the IEEE 802.11n has come into the spotlight. Among them, IEEE 802.11ac supports a wide bandwidth (80 to 160 MHz) in the 5 GHz frequencies. The IEEE 802.11ac standard is defined only in the 5 GHz band, but initial 11ac chipsets will support even operations in the 2.4 GHz band for the backward compatibility with the existing 2.4 GHz band products. Theoretically, according to the standard, wireless LAN speeds of multiple stations are enabled up to a minimum of 1 Gbps and a maximum single link speed is enabled up to a minimum of 500 Mbps. This is achieved by extending concepts of a wireless interface accepted by 802.11n, such as a wider wireless frequency bandwidth (a maximum of 160 MHz), more MIMO spatial streams (a maximum of 8), multi-user MIMO, and high-density modulation (a maximum of 256 QAM). Further, as a scheme that transmits data by using a 60 GHz band instead of the existing 2.4 GHz/5 GHz, IEEE 802.11ad has been provided. The IEEE 802.11ad is a transmission standard that provides a speed of a maximum of 7 Gbps by using a beamforming technology and is suitable for high bit rate moving picture streaming such as massive data or non-compression HD video. However, since it is difficult for the 60 GHz frequency band to pass through an obstacle, it is disadvantageous in that the 60 GHz frequency band can be used only among devices in a short-distance space. Meanwhile, in recent years, as next-generation wireless LAN standards after the 802.11ac and 802.11ad, discussion for providing a high-efficiency and high-performance wireless LAN communication technology in a high-density environment is continuously performed. That is, in a next-generation wireless LAN environment, communication having high frequency efficiency needs to be provided indoors/outdoors under the presence of high-density stat