Preamble extension fields in wakeup PPDUs
AssigneeCisco Technology, Inc.
InventorsBrian D. Hart, Pooya Monajemi
Life of this patent
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Abstract
Embodiments herein describe waking up client devices using a physical layer protocol data unit (PPDU) with a preamble extension field with a length that permits the client device to wake up a higher power (or higher capability) radio. In one embodiment, a first portion of a preamble of the PPDU is received at the client device using a lower power (or lower capability) receiver. This triggers the client device to wake up its higher power receiver, which occurs while the client device receives the preamble extension field. At the end of the preamble extension field, the client device then receives the remaining portion of the PPDU using its higher power receiver.
Claims20
An access point (AP), comprising:
- a processor;
- and
- memory comprising an application that, when executed by the processor performs an operation comprising:
- transmitting a first portion of a preamble of a wakeup physical layer protocol data unit (PPDU) to a client device, the first portion comprising information to wake up the client device,
- transmitting a preamble extension field to the client device after transmitting the first portion of the preamble, wherein the preamble extension field provides sufficient time for the client device to wake up a receiver operating at higher power, and
- transmitting a remaining portion of the wakeup PPDU to the client device which is received using the receiver operating at higher power, wherein the remaining portion comprises a second portion of the preamble of the wakeup PPDU and a data pay load.
An access point (AP), comprising:
- a processor;
- and
- memory comprising an application that, when executed by the processor performs an operation comprising:
- transmitting a first portion of a preamble of a wakeup physical layer protocol data unit (PPDU) to a client device, the first portion comprising information to wake up the client device, one or more client identifiers (IDs) corresponding to one or more client devices, and a length of extension field indicating a length of a preamble extension field,
- transmitting the preamble extension field to the client device after transmitting the first portion of the preamble, wherein the preamble extension field provides sufficient time for the client device to wake up a receiver operating at higher power, and
- transmitting a remaining portion of the wakeup PPDU to the client device which is received using the receiver operating at higher power.
A first wireless station (STA), comprising:
- a processor;
- and
- memory comprising an application that, when executed by the processor performs an operation comprising:
- receiving a first portion of a preamble of a wakeup physical layer protocol data unit (PPDU) from a second wireless STA, the first portion comprising information to wake up the first wireless STA,
- receiving a preamble extension field from the second wireless STA after receiving the first portion of the preamble, wherein the preamble extension field provides sufficient time for the client device to wake up a receiver operating at higher power, and
- receiving a remaining portion of the wakeup PPDU at the first wireless STA which is received using the receiver operating at higher power, wherein the remaining portion comprises a second portion of the preamble of the wakeup PDDU and a data payload.
Dependencies are inferred from the claim text.