Search

EP-4387369-B1 - WIRELESS COMMUNICATION METHOD USING MULTILINK AND WIRELESS COMMUNICATION TERMINAL USING SAME

EP4387369B1EP 4387369 B1EP4387369 B1EP 4387369B1EP-4387369-B1

Inventors

  • KIM, SANGHYUN
  • KO, Geonjung
  • SON, JUHYUNG
  • KWAK, JINSAM

Dates

Publication Date
20260513
Application Date
20220811

Claims (14)

  1. A wireless communication terminal (100) of a wireless communication system, the wireless communication terminal comprising: a transceiver (120); and a processor (110), wherein the processor (110) is configured to: receive a frame for triggering transmission of a physical layer protocol data unit, PPDU, within a restricted target wake time service period, R-TWT SP, from an access point, AP, wherein the R-TWT SP is a period in which a first frame(s) for a low latency traffic identifier(s), TID(s), is transmitted with priority over a second frame(s) for a first TID(s) different from the low latency TID(s), and wherein the second frame(s) for the first TID(s) is allowed to be transmitted within the R-TWT SP depending on whether one of restricted conditions is satisfied, and transmit a trigger-based, TB, PPDU including the first frame(s) for the low latency TID(s) within the R-TWT SP based on the frame, wherein the first frame(s) is first included in an Aggregate Medium Access Control Protocol Data Unit, A-MPDU, before the second frame(s) when i) the first frame(s) for the low latency TID(s) and the second frame(s) for the first TID(s) are aggregated and included in the A-MPDU and ii) the TB PPDU includes the A-MPDU.
  2. The wireless communication terminal (100) of claim 1, wherein the restricted conditions include i) whether all of the first frame(s) stored in a queue have been transmitted, and ii) whether the second frame(s) is aggregated with the first frame(s) and included in the A-MPDU.
  3. The wireless communication terminal (100) of claim 1, wherein the processor is further configured to: receive a specific frame including information to indicate the low latency TID(s).
  4. The wireless communication terminal (100) of claim 1, wherein the low latency TID(s) is mapped to at least one first Access Category, AC, and wherein the first TID(s) is mapped to at least one second AC that is different from the at least one first AC.
  5. The wireless communication terminal (100) of claim 4, wherein a decrease of a first back-off counter for the at least one second AC mapped to each of the first TID(s) suspends when the R-TWT SP starts.
  6. The wireless communication terminal (100) of claim 5, wherein after the decrease of the first back-off counter suspends, the decrease of the first back-off counter resumes i) afterward all of the first frame(s) stored in a queue have been transmitted, or ii) when the R-TWT SP is ended.
  7. The wireless communication terminal (100) of claim 4, wherein the at least one first AC for a plurality of TIDs including the low latency TID(s) and a second TID(s) is mapped to a second back-off counter, and wherein a decrease of the second back-off counter within the R-TWT SP does not suspend for the R-TWT SP.
  8. A traffic transmission method performed by a terminal (100) in a wireless communication system, the method comprising: receiving a frame for triggering transmission of a physical layer protocol data unit, PPDU, within a restricted target wake time service period, R-TWT SP, from an access point, AP, wherein the R-TWT SP is a period in which a first frame(s) for a low latency traffic identifier(s), TID(s), is transmitted with priority over a second frame(s) for a first TID(s) different from the low latency TID(s), and wherein the second frame(s) for the first TID(s) is allowed to be transmitted within the R-TWT SP depending on whether one of restricted conditions is satisfied, and transmitting a trigger-based, TB, PPDU including the first frame(s) for the low latency TID(s) within the R-TWT SP based on the frame, wherein the first frame(s) is first included in an Aggregate Medium Access Control Protocol Data Unit, A-MPDU, before the second frame(s) when i) the first frame(s) for the low latency TID(s) and the second frame(s) for the first TID(s) are aggregated and included in the A-MPDU and ii) the TB PPDU includes the A-MPDU.
  9. The method of claim 8, wherein the restricted conditions include i) whether all of the first frame(s) stored in a queue have been transmitted, and ii) whether the second frame(s) is aggregated with the first frame(s) and included in the A-MPDU.
  10. The method of claim 8, the method further comprising: receive a specific frame including information to indicate the low latency TID(s).
  11. The method of claim 8, wherein the low latency TID(s) is mapped to at least one first Access Category, AC, and wherein the first TID(s) is mapped to at least one second AC that is different from the at least one first AC.
  12. The method of claim 11, wherein a decrease of a first back-off counter for the at least one second AC mapped to each of the first TID(s) suspends when the R-TWT SP starts.
  13. The method of claim 12, wherein after the decrease of the first back-off counter suspends, the decrease of the first back-off counter resumes i) afterward all of the first frame(s) stored in a queue have been transmitted, or ii) when the R-TWT SP is ended.
  14. The method of claim 11, wherein a decrease of a second back-off counter for the at least one first AC mapped to each of a second TID(s) excluding the low latency TID(s) among a plurality of TIDs does not suspend within the R-TWT SP.

Description

Technical Field The present invention relates to a wireless communication method using multiple links, and a wireless communication terminal 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. As a wireless LAN standard after 802.11ac and 802.11ad, the IEEE 802.11ax (high efficiency WLAN, HEW) standard for providing a high-efficiency and high-performance wireless LAN communication technology in a high-density environment, in which APs and terminals are concentrated, is in the development completion stage. In an 802.11ax-based wireless LAN environment, communication with high frequency efficiency should be provided indoors/outdoors in the presence of high-density stations and access points (APs), and various technologies have been developed to implement the same. In order to support new multimedia applications, such as high-definition video and real-time games, the development of a new wir