Transition Delay Indication in Wake-Up Receiver Frames
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Solution Overview
Problem
Current wireless communication systems face challenges in managing transition delay during power-on operations of low-power devices, leading to unpredictable power consumption and potential failures in wake-up transmissions, as there is no standard encoding or size for the transition delay field in Wake-Up Receiver (WUR) capabilities.
Innovation Solution
A transition delay indication system is introduced, utilizing a transition delay field within the WUR frame with specific entries to indicate unknown or high transition delays, allowing Access Points (APs) to determine successful wake-up transmissions and exclude devices with unknown delays from group transmissions, enabling efficient power management and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low-power device stays in deep sleep state to conserve energy, then power consumption is reduced, but the transition delay to become operational increases and becomes unpredictable
Solution Approach 1:
The device performs preliminary actions by pre-loading essential code and data into SRAM before entering deep sleep state. This preliminary preparation ensures that upon wake-up, the main radio can be powered on immediately without waiting for code reload, thus reducing transition delay while maintaining low power consumption during sleep
Solution Approach 2:
The system dynamically manages power states and transition timing based on operational requirements. By making the transition delay configurable and adjustable rather than fixed, the system can optimize between power savings and response time depending on the specific use case and network conditions
2Device complexity
If the transition delay field uses a fixed small size for encoding, then the frame structure remains simple, but it cannot accurately represent varying transition delay values
Solution Approach 1:
The transition delay field is segmented into multiple bits that can be independently configured. This segmentation allows the field to represent a range of delay values through different bit combinations, providing both granularity for precise measurement and flexibility for configuration without requiring an excessively large field size
Solution Approach 2:
The system changes the parameter of transition delay indication from a fixed-value field to a configurable field where the number of bits and encoding scheme can be adjusted. This parameter change enables the field to adapt to different delay requirements while maintaining reasonable frame structure complexity
3Use of energy by moving object
If the device reloads code from host during wake-up, then memory is cleared for power saving, but the wake-up time becomes unpredictable due to CPU availability
Solution Approach 1:
The code is pre-loaded into SRAM before the device enters deep sleep state. This preliminary action eliminates the need for code reload during wake-up, ensuring predictable and immediate activation of the main radio regardless of CPU availability, thus improving both reliability and power efficiency
Solution Approach 2:
SRAM serves as an intermediary storage medium between the host and the main radio. By loading code into this intermediate memory before sleep, the system decouples the wake-up process from host CPU availability, enabling independent and predictable radio activation
Data Source
AI summary
This disclosure describes systems, methods, and devices related to delay indication. A device may identify a first frame received from a first station device, wherein the first frame comprises a first transition delay field, wherein the first transition delay field comprises a first transition delay value associated with a power state transition. The device may determine a wake up receiver (WUR) frame comprising an indication for waking up the main radio of the first station device. The device may cause to send the WUR frame to the first station device based on the first transition delay value.