US 11,743,943 B2
Wireless communication method and wireless communication terminal in high density environment including overlapped basic service sets
Geonjung Ko, Gyeonggi-do (KR); Juhyung Son, Gyeonggi-do (KR); Jinsam Kwak, Gyeonggi-do (KR); and Woojin Ahn, Gyeonggi-do (KR)
Assigned to WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Gyeonggi-Do (KR); and SK TELECOM CO., LTD., Seoul (KR)
Filed by WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC., Gyeonggi-do (KR); and SK TELECOM CO., LTD., Seoul (KR)
Filed on Apr. 7, 2022, as Appl. No. 17/715,040.
Application 17/715,040 is a continuation of application No. 16/942,764, filed on Jul. 30, 2020, granted, now 11,330,628.
Application 16/942,764 is a continuation of application No. 15/968,681, filed on May 1, 2018, granted, now 10,764,924, issued on Sep. 1, 2020.
Application 15/968,681 is a continuation of application No. PCT/KR2016/012615, filed on Nov. 3, 2016.
Claims priority of application No. 10-2015-0154100 (KR), filed on Nov. 3, 2015; application No. 10-2015-0156467 (KR), filed on Nov. 9, 2015; application No. 10-2016-0062425 (KR), filed on May 20, 2016; application No. 10-2016-0074091 (KR), filed on Jun. 14, 2016; and application No. 10-2016-0086044 (KR), filed on Jul. 7, 2016.
Prior Publication US 2022/0232632 A1, Jul. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/08 (2009.01); H04W 84/12 (2009.01); H04W 52/24 (2009.01); H04B 17/318 (2015.01)
CPC H04W 74/0808 (2013.01) [H04B 17/318 (2015.01); H04W 52/243 (2013.01); H04W 52/245 (2013.01); H04W 84/12 (2013.01); Y02D 30/70 (2020.08)] 8 Claims
OG exemplary drawing
 
1. A wireless communication terminal that communicates wirelessly, the terminal comprising:
a transceiver; and
a processor,
wherein the processor is configured:
to receive a first PLCP Protocol Data Unit (PPDU) including a trigger frame through the transceiver, wherein the trigger frame triggers an uplink multiuser PPDU transmission of one or more wireless communication terminals in a first Basic Service Set (BSS) which is overlapped with a second BSS including the wireless communication terminal,
to receive a physical layer header of a second PPDU which is transmitted in response to the trigger frame, wherein the physical layer header of the second PPDU comprises a spatial reuse field indicating a parameter, wherein the parameter is determined based on a magnitude of interference acceptable by a wireless communication terminal which transmits the first PPDU when receiving the second PPDU, and a transmission power of the first PPDU,
when predetermined conditions are met, to transmit a third PPDU while the second PPDU being transmitted and not to set a network allocation vector based on the trigger frame, wherein the predetermined conditions include that a transmission power of the third PPDU is below than a value which is determined based on a received signal strength of the first PPDU and the parameter, and a BSS color indicated by the physical layer header of the second PPDU is equal to a BSS color indicated by a physical layer header of the first PPDU, wherein the value of the parameter is a value normalized over a 20 MHz frequency bandwidth, and
when at least one of the predetermined conditions is not met, to determine whether a channel through which the third PPDU to be transmitted is idle by using a static Clear Channel Assessment (CCA) threshold value as a reference value and transmit the third PPDU according to whether the channel is idle while the second PPDU being transmitted,
wherein the static CCA threshold value is used for determining whether a channel is idle when the wireless communication terminal is receiving a PPDU transmitted from the second BSS.