Wake-Up Radio Group-ID Allocation for IoT Power Management
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Solution Overview
Problem
The high power consumption of Wi-Fi in IoT devices due to the need for the Wi-Fi radio to be constantly active to listen for management frames limits their battery life, particularly in low-duty cycle applications like asset tracking.
Innovation Solution
Implementing a Wake-Up Radio (WUR) in conjunction with the primary 802.11 radio, which operates in low power receive-only mode and can be activated by a wake-up packet, allowing for duty-cycled operation and efficient Group ID allocation to reduce the time IoT devices spend on the medium, thereby minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Wi-Fi radio is kept constantly active to listen for management frames, then network connectivity and responsiveness are maintained, but power consumption increases dramatically
Solution Approach 1:
The patent segments the radio functionality by introducing a Wake-Up Radio (WUR) that operates independently from the main 802.11 radio. The WUR handles wake-up signaling while the main radio can remain in low-power sleep mode, dividing the radio system into two functional parts with different power consumption characteristics.
Solution Approach 2:
The Wake-Up Radio acts as an intermediary between the low-power sleep state and the full Wi-Fi operation. It receives wake-up packets from access points and triggers the main radio to wake up only when necessary, mediating between power savings and network responsiveness.
2Speed
If the Wi-Fi radio operates continuously to ensure immediate response to network events, then network responsiveness is maintained, but battery standby time is reduced
Solution Approach 1:
The patent implements periodic duty-cycled operation where the main radio alternates between sleep mode and active listening. The WUR operates periodically to detect wake-up packets, allowing the main radio to sleep during intervals while maintaining the ability to respond when needed.
Solution Approach 2:
The Wake-Up Radio performs preliminary detection of wake-up signals before the main radio needs to become active. This preliminary action allows the system to remain in low-power state longer while still being able to respond to network events promptly when wake-up packets are detected.
3Productivity
If Group ID allocation is implemented to wake up multiple stations simultaneously, then network efficiency improves, but the complexity of radio management increases
Solution Approach 1:
The patent merges multiple wake-up packet receptions into a single Group ID-based wake-up event. Instead of waking up individually for each wake-up packet, stations with the same Group ID can be awakened simultaneously through unified management, reducing the number of individual radio wake-up cycles needed.
Data Source
AI summary
A method for wake-up radio group ID (GID) allocation includes generating, by an access point and prior to a station associating to the access point, a first Group-ID and a second Group-ID, wherein the station comprises a Wake-Up Radio, receiving, by the access point, a request from the station to associate, determining, by the access point, whether the station belongs in the first Group-ID or the second Group-ID, assigning, by the access point and based on the determining, the station to the first Group-ID, and sending, by the access point, a Wake-Up Packet to the Wake-Up Radio of the station using the first Group-ID.