Communication Apparatus Grouping Wake-up Frames by Transition Delay
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Solution Overview
Problem
In IEEE 802.11ba standard wireless LANs, STAs with shorter transition delays from Doze to Awake states are forced to wait longer due to the longest delay value used for all STAs, leading to increased power consumption.
Innovation Solution
A communication apparatus that obtains Transition delay values from each STA, groups them based on these values, and transmits Wake-up frames in an order tailored to each group's delay, allowing STAs to switch to Awake state efficiently and reducing unnecessary power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP uses the longest Transition delay value among all STAs for Wake-up frame transmission timing, then all STAs can receive data frames without missing transmissions, but STAs with shorter transition delays are forced to wait longer in the Awake state, increasing their power consumption
Solution Approach 1:
The patent segments STAs into multiple groups based on their Transition delay characteristics (first group with shorter delays, second group with longer delays). The AP then transmits Wake-up frames to different groups at different timings, allowing each group to transition to Awake state and receive data frames at optimized times. This segmentation resolves the contradiction by enabling reliable data reception for all STAs while minimizing unnecessary waiting time and power consumption for STAs with shorter transition delays.
2Use of energy by moving object
If the AP transmits data frames earlier to match shorter transition delays, then power consumption is reduced, but STAs with longer transition delays cannot receive data frames properly
Solution Approach 1:
The patent applies preliminary action by having the AP transmit Wake-up frames to the second group (STAs with longer transition delays) before transmitting data frames to the first group (STAs with shorter transition delays). This preliminary Wake-up frame transmission ensures that STAs with longer delays have sufficient time to transition to the Awake state and be ready to receive data frames, while STAs with shorter delays can receive data frames earlier. This resolves the contradiction by ensuring reliable data frame reception for all STAs while optimizing power consumption through staggered transmission timing.
Data Source
AI summary
A communication apparatus operable to communicate with a plurality of terminal stations capable of operating in a Doze state and in an Awake state in an IEEE 802.11ba standard, obtains, from each of the plurality of terminal stations, a value of a Transition delay indicating a time period required to switch from the Doze state to the Awake state, groups the plurality of terminal stations into a plurality of groups based on the value of each of the plurality of terminal stations, sets an order for transmitting the Wake-up frame for causing a transition from the Doze state to the Awake state for each of the plurality of groups, and transmits, according to the set order, the Wake-up frame to one or more terminal stations belonging to each of the plurality of groups.