Media access control for wakeup radios

An apparatus for wireless communication, in a system comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• identify a plurality of wakeup transmission periods corresponding to a duty cycle for a station to be powered on to receive wakeup signal physical layer conversion protocol (PLCP) protocol data unit (PPDUs), the duty cycle comprising periodic transmission times during which an access point (AP) transmits the wakeup signal PPDUs, each of the wakeup signal PPDUs comprising a preamble and a wakeup message, the preamble comprising a first portion and a second portion;
• identify two or more stations to be activated by the AP;
• transmit, to a wakeup radio of the station during a wakeup transmission period of the plurality of wakeup transmission periods, the first portion of the preamble of the wakeup signal PPDU and the second portion of the preamble of the wakeup signal PPDU, the first portion having a first bandwidth and the second portion having a second bandwidth narrower than the first bandwidth, the second portion of the preamble being a preamble to the wakeup message of the wakeup signal PPDU;
• and
• transmit, during the wakeup transmission period, the wakeup message of the wakeup signal PPDU to the wakeup radio of the station, the wakeup message having a second bandwidth narrower than the first bandwidth and following the transmitted second portion of the preamble, the wakeup message comprising an indication of a plurality of station identifiers associated with the identified two or more stations to be activated by the wakeup message transmitted by the AP, the plurality of station identifiers arranged in ascending order according to a wakeup frequency associated with each station of the two or more stations.

A method for wireless communication at a station, comprising:

• powering on, according to a duty cycle, a wakeup radio of the station to receive a wakeup signal physical layer conversion protocol (PLCP) protocol data unit (PPDU), the duty cycle comprising periodic transmission times during which an access point (AP) transmits the wakeup signal PPDU, the wakeup signal PPDU comprising a preamble and a wakeup message, the preamble comprising a first portion and a second portion, the wakeup message comprising a plurality of station identifiers arranged in ascending order according to a wakeup frequency associated with each station identifier of the plurality of station identifiers;
• receiving, at the powered-on wakeup radio of the station, the first portion of the preamble of the wakeup signal PPDU and the second portion of the preamble of the wakeup signal PPDU from the AP, the first portion having a first bandwidth and the second portion having a second bandwidth narrower than the first bandwidth, the second portion of the preamble being a preamble to the wakeup message of the wakeup signal PPDU;
• receiving, from the AP at the powered-on wakeup radio of the station, the wakeup message of the wakeup signal PPDU, the wakeup message having the second bandwidth narrower than the first bandwidth and following the received second portion of the preamble;
• identifying, in the received wakeup message, an indication of a station identifier from the plurality of station identifiers arranged in ascending order according to the wakeup frequency, the station identifier corresponding to the station to be activated by the wakeup message;
• and
• powering on a primary radio of the station based at least in part on receiving the wakeup message at the powered-on wakeup radio and identifying the station identifier.

A method for wireless communication at an access point (AP), comprising:

• identifying a plurality of wakeup transmission periods corresponding to a duty cycle for a station to be powered on to receive wakeup signal physical layer conversion protocol (PLCP) protocol data unit (PPDUs), the duty cycle comprising periodic transmission times during which the AP transmits the wakeup signal PPDUs, each of the wakeup signal PPDUs comprising a preamble and a wakeup message, the preamble comprising a first portion and a second portion
• identifying two or more stations to be activated by the AP;
• transmitting, to a wakeup radio of the station during a wakeup transmission period of the plurality of wakeup transmission periods, the first portion of the preamble of the wakeup signal PPDU and the second portion of the preamble of the wakeup signal PPDU, the first portion having a first bandwidth and the second portion having a second bandwidth narrower than the first bandwidth, the second portion of the preamble being a preamble to the wakeup message of the wakeup signal PPDU;
• and
• transmitting, during the wakeup transmission period, the wakeup message of the wakeup signal PPDU to the wakeup radio of the station, the wakeup message having a second bandwidth narrower than the first bandwidth and following the transmitted second portion of the preamble, the wakeup message comprising an indication of a plurality of station identifiers, the plurality of station identifiers corresponding to the two or more stations to be activated by the wakeup message transmitted by the AP, the plurality of station identifiers arranged in ascending order according to a wakeup frequency associated with each station of the two or more stations.