WLAN device with preamble decode-based receive suspend during undesired packets

A method comprising:

• receiving, by a device, a packet comprising a Physical Layer Convergence Protocol (PLCP) header comprising a length field;
• determining, by the device, whether time remaining for turning off and on a first portion of a receive chain of the device is greater than a threshold, based on the length field of the PLOP header of the packet;
• turning off the first portion of the receive chain, in response to determining that the time remaining for turning off and on the first portion of the receive chain of the device is greater than the threshold, wherein turning off the first portion of the receive chain comprises sending a receive interrupt signal to a physical (PHY) layer of the device;
• maintaining a high Clear Channel Assessment (CCA) setting while the first portion of the receive chain is off;
• setting the receive interrupt signal to extend to an end of the packet;
• and
• issuing a receive suspend interrupt for turning on the first portion of the receive chain, in response to detecting the end of the packet.

A method comprising:

• receiving, by a device, a packet comprising a Physical Layer Convergence Protocol (PLCP) header comprising a length field;
• determining, by the device, whether the packet is undesignated, based on the length field of the PLCP header of the packet, wherein the packet is undesignated when the packet cannot be successfully decoded by the device due to including at least one of an;
• unsupported wireless local area network (WLAN) protocol or an unsupported channel rate;
• and
• turning off a first portion of a receive chain, in response to determining that the packet is undesignated.

A device comprising:

• a transceiver comprising a receive chain that includes an analog portion and a digital portion, the transceiver configured to receive a packet comprising a Physical Layer Convergence Protocol (PLCP) header comprising a length field;
• at least one processor coupled to the transceiver;
• and
• a non-transitory computer readable storage medium storing a program for execution by the at least one processor, the program including instructions to cause the at least one processor to:
• determine whether the packet is undesignated with respect to the device, based on the length field of the PLOP header of the packet;
• determine whether time remaining for turning off and on a first portion of the receive chain of the device is greater than a threshold, based on the length field of the PLOP header of the packet;
• and
• cause the first portion of the receive chain to turn off, in response to determining that the packet is undesignated and determining that the time remaining for turning off and on the first portion of the receive chain of the device is greater than the threshold.