Chained STA Wake-Up Scheduling for Longer Battery Standby
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increase in the number of wake-up receivers leads to unnecessary wake-up packet decodes, decreasing battery standby time in stations (STAs) due to the lack of methods that enable only a subset of STAs to wake up efficiently.
Innovation Solution
Implementing a method where a station determines a common service period and deferral time for a group of STAs, allowing a head node to receive a wake-up packet and transmit or backscatter it to another STA after a deferred time based on energy harvesting information, thereby optimizing wake-up operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all wake-up receivers decode every wake-up packet to determine if addressed to themselves, then each STA can reliably identify packets intended for it, but the number of unnecessary wake-up packet decodes increases, decreasing battery standby time
Solution Approach 1:
The wake-up packet decoding process is segmented into two stages: (1) A wake-up receiver with low power consumption performs initial decoding of a first portion of the wake-up packet to obtain a wake-up identifier; (2) The main receiver decodes the second portion only after the wake-up identifier indicates the packet is addressed to this STA. This segmentation reduces unnecessary full packet decodes and conserves battery energy.
Solution Approach 2:
The wake-up receiver performs preliminary decoding of the wake-up packet before the main receiver activates. By pre-checking the wake-up identifier in the first portion of the packet, the system determines in advance whether the STA needs to fully wake up and process the complete packet, thereby avoiding unnecessary energy consumption from decoding packets not intended for the STA.
2Adaptability or versatility
If multiple STAs wake up simultaneously to receive wake-up packets, then all STAs can potentially receive their packets, but unnecessary wake-up packet decodes increase, reducing battery efficiency
Solution Approach 1:
The system dynamically adjusts the wake-up behavior of STAs based on the wake-up identifier. Instead of all STAs waking up simultaneously and decoding packets, the dynamic mechanism allows only the STA whose identifier matches the wake-up identifier to fully wake up and decode the packet, while other STAs remain in low-power mode, thereby reducing energy loss.
Solution Approach 2:
The wake-up receiver performs only partial decoding of the wake-up packet (first portion containing wake-up identifier) rather than decoding the entire packet. This partial action is sufficient to determine whether the packet is intended for the STA, avoiding the excessive energy consumption of full packet decoding for all STAs.
Data Source
AI summary
Methods and apparatuses are described herein for chained and delayed wake-up. For example, a station (STA) may determine, at the formation of a group of STAs, a common service period for the group. The STA may determine a deferral time for a first STA of the group. The deferral time may indicate when the first STA wakes up to receive a wake-up packet. The STA may receive, from an access point (AP), during a service period in which the STA acts as a head node for communication with the AP, a wake-up packet addressed to the first STA. The STA may transmit, based on a determination that the deferral time associated with the wake-up packet addressed to the first STA ends after the service period in which the STA acts as a head node, a wake-up command that includes the wake-up packet addressed to the first STA.