US Patent No. 10,433,338

METHOD FOR TRANSMITTING AND RECEIVING FRAME IN WIRELESS LOCAL AREA NETWORK


Patent No. 10,433,338
Issue Date October 01, 2019
Title Method For Transmitting And Receiving Frame In Wireless Local Area Network
Inventorship Yongjin Kwon, Daejeon (KR)
Hyungu Park, Daejeon (KR)
Assignee NEWRACOM, INC., Lake Forest, CA (US)

Claim of US Patent No. 10,433,338

1. A method for transmitting a frame, performed in a first station, the method comprising:receiving a first physical layer (PHY) protocol data unit (PPDU);
determining whether a basic service set (BSS) of the first PPDU can be determined;
in response to determining that the BSS of the first PPDU cannot be determined, when a received signal strength of the first PPDU is higher than a first threshold, setting a medium access control (MAC)-level virtual carrier sensing, wherein setting the MAC-level virtual carrier sensing includes setting a virtual carrier sensing by using duration information included in a MAC header of the first PPDU;
in response to determining that the BSS of the first PPDU can be determined, determining whether the BSS of the first PPDU is a BSS (MyBSS) to which the first station belongs or an Other BSS (OBSS) to which the first station does not belong;
when the BSS of the first PPDU is determined to be the OBSS:
when the received signal strength of the first PPDU is higher than the first threshold and the first PPDU is a frame having a mode that is a High Efficiency mode and having a PHY header that includes duration information for setting a virtual carrier sensing, setting a PHY-level virtual carrier sensing, wherein setting the PHY-level virtual carrier sensing includes setting the virtual carrier sensing by using the duration information included in a PHY header of the first PPDU,
when the received signal strength of the first PPDU is higher than the first threshold and the first PPDU is a frame having a mode of a standard previous to a standard defining the High Efficiency mode, setting a medium access control (MAC)-level virtual carrier sensing, wherein setting the MAC-level virtual carrier sensing includes setting a virtual carrier sensing by using the duration information included in the MAC header of the first PPDU, and
when the received signal strength of the first PPDU is lower than the first threshold, trying to obtain a transmission opportunity.