Patent ID: 9509465
Filing Date: 2016-11-29
CPC Classification: H04L,H04W

Claim Text:
1. A communication station comprising: a transceiver configured to communicate on a primary 20 MHz channel and up to three or more secondary channels including a secondary 20 MHz channel, a secondary 40 MHz channel and a secondary 80 MHz channel for operating channel widths of 20 MHz, 40 MHz, 80 MHz and 160 MHz; and processing circuitry, to configure the transceiver, for Clear Channel Assessment-Energy Detect (CCA-ED), to: issue a primary channel busy condition when a 20 MHz data unit is detected in the primary 20 MHz channel at or above a first predetermined energy level; issue a secondary channel busy condition when a primary channel busy condition has not been issued and when any signal is detected within the secondary 20 MHz channel at or above a second predetermined energy level; and issue a secondary channel busy condition when a primary channel busy condition has not been issued and when a 20 MHz data unit is detected in the secondary 20 MHz channel or a 20 MHz sub-channel of either the secondary 40 MHz channel or the secondary 80 MHz channel at or above a third predetermined energy level, wherein a 20 MHz data unit in the primary 20 MHz channel an energy level at or above the first predetermined energy level and below the third predetermined energy level is detected using preamble detection followed by a guard interval detection, the preamble detection detecting a start of a Physical Layer Convergence Protocol (PLCP) protocol data units (PPDU).