Signature-Coded Wake-Up Transmission
First Claim
1. A method for communicating data by a device, comprising:
- scanning, via a wake-up receiver, for an incoming radio frequency (RF) signal while a radio receiver is in sleep mode;
detecting an incoming RF signal;
comparing an incoming RF signal with a signature code, the signature code based on a duration of data frame characteristics in the incoming RF signal, wherein the data frame characteristics have a fixed timing structure; and
waking the radio receiver when an incoming RF signal matches the signature code.
1 Assignment
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Accused Products
Abstract
A wake-up radio is configured to scan for transmissions while the radio receiver is in sleep mode. The wake-up radio detects incoming RF transmissions intended for the radio receiver by analyzing data frame characteristics in an incoming RF transmission. The data frame characteristics may contain a signature code that is unique to the radio receiver. The signature code may be based on the time duration of a sequence of orthogonal frequency division multiplex (OFDM) symbols received in a clear to send to self (CTS2S) transmission or a time duration of short interframe spaces (SIFS) used to transmit the data frames.
25 Citations
27 Claims
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1. A method for communicating data by a device, comprising:
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scanning, via a wake-up receiver, for an incoming radio frequency (RF) signal while a radio receiver is in sleep mode; detecting an incoming RF signal; comparing an incoming RF signal with a signature code, the signature code based on a duration of data frame characteristics in the incoming RF signal, wherein the data frame characteristics have a fixed timing structure; and waking the radio receiver when an incoming RF signal matches the signature code. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory machine readable storage medium, storing thereon processor-executable instructions, that when executed on a processor:
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detects an incoming RF signal having a signature code embedded therein, the signature code transmitted in a Clear To Send To Self transmission; generates an interrupt signal when the signature code embedded in the incoming RF signal matches a stored signature code; and awakens a radio receiver from sleep mode in response to the interrupt signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless device, comprising:
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a radio receiver to receive and process a radio frequency (RF) signal, the radio receiver configured to operate in a sleep mode and an active mode, the RF signal configured in accordance with an IEEE 802.11 specification; a radio controller, coupled to the radio receiver, that switches the radio receiver between a sleep mode and an active mode; and a wake-up radio, coupled to the radio controller, to detect an incoming RF signal having a signature code embedded therein and to generate an interrupt signal to the radio controller when the signature code embedded in the incoming RF signal matches a stored signature code associated with the wireless device, the stored signature code based at least in part on a duration of constant time values used to transmit data frames from an access point. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A wireless device comprising:
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a radio receiver; means for scanning an incoming radio frequency (RF) signal while the radio receiver is in sleep mode; means for comparing the incoming RF signal with a signature code, the signature code based on a duration of data frame characteristics in the incoming RF signal, wherein the data frame characteristics have a fixed timing structure; and means for waking the radio receiver when the incoming RF signal matches the signature code. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification