Security design for a wake up frame
Methods and systems for waking up an electronic device having a wake-up receiver circuit. A signal is transmitted, carrying a wake-up frame (WUF) including a protocol data unit (PDU). A wake-up sequence is inserted in a portion ahead of the PDU. The wake-up sequence is used by the electronic device for detection of the WUF and identification of the intended recipient. The WUF also includes a wake-up identifier (WUID) that is used by the electronic device to authenticate the WUF.
1. A method of waking up an electronic device (ED) having a wake-up receiver circuit, the method comprising:
transmitting a signal comprising a wake-up frame (WUF) within a physical protocol data unit (PPDU);
wherein the WUF includes a wake-up sequence inserted in a portion within the PPDU, the wake-up sequence encoding information for detection that the WUF is intended to wake up the ED and for determination of at least one intended recipient device;
wherein the WUF further includes a wake-up identifier (WUID) in a data portion following the wake-up sequence, the WUID being separate from the wake-up sequence, the WUID encoding information for authenticating the WUF; and
wherein the wake-up sequence is generated using at least a portion of a device identifier of the intended recipient device as input for a sequence generation algorithm, the sequence generation algorithm being selected to generate sequences having good autocorrelation properties.
2. The method of claim 1 , wherein the WUF includes a physical layer preamble (PHY preamble), and the wake-up sequence is inserted in the PHY preamble.
3. The method of claim 1 , wherein the WUF includes a physical layer preamble (PHY preamble) and a physical layer header (PHY header), and the wake-up sequence is inserted between the PHY preamble and the PHY header.
4. The method of claim 1 wherein the information encoded in the WUID further is for identifying the at least one intended recipient device.
5. The method of claim 1 wherein the sequence generation algorithm is for generation of a Gold sequence.
6. The method of claim 5 wherein the at least the portion of the device identifier is used to define a shift operator for generation of the Gold sequence.
7. The method of claim 1 wherein the WUID is generated by a source of the WUF based on a wake-up key (WUK) shared between the source and the at least one intended recipient device.
8. The method of claim 7 further comprising:
after transmitting a first WUF with a first WUID generated using the WUK, using the first WUID and the same WUK to generate a second WUID for a second WUF.
9. The method of claim 1 wherein the WUID is assigned to the at least one intended recipient device by a source of the WUF.
10. The method of claim 1 further comprising:
encrypting at least a data portion of the WUF using a wake-up key (WUK) before transmitting the signal comprising the WUF;
wherein the WUK is shared between a source of the WUF and the at least one intended recipient device.
11. The method of claim 1 further comprising:
scrambling at least a data portion of the WUF using a wake-up key (WUK) or using the WUID, before transmitting the signal comprising the WUF.
12. An apparatus comprising a processing configured to execute machine-executable instructions to cause the apparatus to:
transmit a signal comprising a wake-up frame (WUF) within a physical protocol data unit (PPDU);
wherein the WUF includes a wake-up sequence inserted in a portion within the PPDU, the wake-up sequence encoding information for detection that the WUF is intended to wake up the ED and for determination of at least one intended recipient device;
wherein the WUF further includes a wake-up identifier (WUID) in a data portion following the wake-up sequence, the WUID being separate from the wake-up sequence, the WUID encoding information for authenticating the WUF; and
wherein the wake-up sequence is generated using at least a portion of a device identifier of the intended recipient device as input for a sequence generation algorithm, the sequence generation algorithm being selected to generate sequences having mod autocorrelation properties.
13. The apparatus of claim 12 , wherein the WUF includes a physical layer preamble (PHY preamble), and the wake-up sequence is inserted in the PHY preamble.
14. The apparatus of claim 12 , wherein the WUF includes a physical layer preamble (PHY preamble) and a physical layer header (PHY header), and the wake-up sequence is inserted between the PHY preamble and the PHY header.
15. The apparatus of claim 12 , wherein the information encoded in the WUID further is for identifying the at least one intended recipient device.
16. The apparatus of claim 12 , wherein the sequence generation algorithm is for generation of a Gold sequence, and wherein the at least the portion of the device identifier is used to define a shift operator for generation of the Gold sequence.
17. The apparatus of claim 12 , wherein the WUID is generated by the apparatus based on a wake-up key (WUK) shared between the apparatus and the at least one intended recipient device.
18. The apparatus of claim 17 , wherein the processing device is further configured to execute instructions to cause the apparatus to:
after transmitting a first WUF with a first WUID generated using the WUK, use the first WUID and the same WUK to generate a second WUID for a second WUF.
19. The apparatus of claim 12 , wherein the processing device is further configured to execute instructions to cause the apparatus to:
encrypt at least a data portion of the WUF using a wake-up key (WUK) before transmitting the signal comprising the WUF;
wherein the WUK is shared between a source of the WUF and the at least one intended recipient device.
20. The apparatus of claim 12 , wherein the processing device is further configured to execute instructions to cause the apparatus to:
scramble at least a data portion of the WUF using a wake-up key (WUK) or using the WUID, before transmitting the signal comprising the WUF.