Techniques for mobile platform power management using low-power wake-up signals
Mobile platform power management is an important problem especially for battery-powered small form factor platforms such as smartphones, tablets, wearable devices, and Internet of Things (IOT) devices. A new low-power wake-up radio (LP-WUR) listens to the wireless medium for a wake-up signal with, for example, below 50 uw power consumption. The LP-WUR allows the mobile platform to completely turn off the main wireless radios, such as Wi-Fi, Bluetooth® (BT), Low-Energy Bluetooth® (BLE), and the like, and then selectively or opportunistically turn them on only when there is data to transmit or receive based on a wake-up signal.
1. A wireless communications device comprising:
a platform power management module and a low-power wake-up radio configured to receive a wake-up signal and selectively wake-up one or more of a receiver radio and one or more receiver platform components, wherein information contained in the wake-up signal specifies which of the one or more of the receiver radio and the one or more receiver platform components are to wake-up.
2. The device of claim 1 , further comprising one or more of a transmitter, a receiver, a Wi-Fi PHY module, a Bluetooth PHY module, a Wi-Fi MAC module, a Bluetooth MAC module, one or more antennas, a processor and memory.
3. The device of claim 1 , wherein the wake-up signal indicates that the wireless communications device should: wake-up a main radio only, wake-up a main radio and one or more of the one or more receiver platform components, or wake-up the main radio and one or more of the one or more receiver platform components and increase a CPU frequency.
4. The device of claim 3 , wherein the platform power management module is further configured to set a small LTR (Latency Tolerance Reporting).
5. The device of claim 1 , wherein the platform power management module is further configured to determine an expected platform wake-up time.
6. The device of claim 5 , wherein the device is further configured to communicate the expected platform wake-up time to another device.
7. The device of claim 6 , wherein the expected platform wake-up time is communicated in a wake-up acknowledgement (ACK).
8. The device of claim 1 , wherein the wake-up signal is in a packet with a platform wake-up mode field.
9. The device of claim 1 , configured to receive a packet including one or more of a legacy IEEE 802.11 preamble, a wake-up preamble, a receiver ID, a radio wake-up mode field, a length field, a data field and a Frame Check Sequence (FCS) field.
10. The device of claim 1 , configured to one or more of save power and reduce latency at least based on the received wake-up signal.
11. A wireless communications method comprising:
receiving, at a wireless device, a wake-up signal; and
selectively waking-up one or more of a receiver radio and one or more receiver platform components, wherein information contained in the wake-up signal specifies which of the one or more of the receiver radio and the one or more receiver platform components are to wake-up.
12. The method of claim 11 , wherein the wireless device comprises one or more of a transmitter, a receiver, a Wi-Fi PHY module, a Bluetooth PHY module, a Wi-Fi MAC module, a Bluetooth MAC module, one or more antennas, a processor and memory.
13. The method of claim 11 , wherein the wake-up signal indicates that the wireless communications device should: wake-up a main radio only, wake-up a main radio and one or more of the one or more receiver platform components, or wake-up the main radio and one or more of the one or more receiver platform components and increase a CPU frequency.
14. The method of claim 13 , further comprising setting a small LTR (Latency Tolerance Reporting).
15. The method of claim 11 , further comprising determining an expected platform wake-up time.
16. The method of claim 15 , further comprising communicating the expected platform wake-up time to another device.
17. The method of claim 16 , wherein the expected platform wake-up time is communicated in a wake-up acknowledgement (ACK).
18. The method of claim 11 , wherein the wake-up signal is in a packet with a platform wake-up mode field.
19. The method of claim 11 , further comprising receiving a packet including one or more of a legacy IEEE 802.11 preamble, a wake-up preamble, a receiver ID, a radio wake-up mode field, a length field, a data field and a Frame Control Sequence (FCS) field.
20. The method of claim 11 , further comprising one or more of saving power and reducing latency at least based on the received wake-up signal.
21. A non-transitory computer-readable information storage media, having stored thereon instructions, that when executed by a processor perform the method of claim 11 .
22. A wireless communications device comprising:
means for receiving, at a wireless device, a wake-up signal; and
means for selectively waking-up one or more of a receiver radio and one or more receiver platform components, wherein information contained in the wake-up signal specifies which of the one or more of the receiver radio and the one or more receiver platform components are to wake-up.
23. The device of claim 22 , wherein the wireless device comprises one or more of a transmitter, a receiver, a Wi-Fi PHY module, a Bluetooth PHY module, a Wi-Fi MAC module, a Bluetooth MAC module, one or more antennas, a processor and memory.
24. The device of claim 22 , wherein the wake-up signal indicates that the wireless communications device should: wake-up a main radio only, wake-up a main radio and one or more of the one or more receiver platform components, or wake-up the main radio and one or more of the one or more receiver platform components and increase a CPU frequency.
25. The device of claim 24 , further comprising setting a small LTR (Latency Tolerance Reporting).