STA ROM Change Delay Regime Negotiation
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Solution Overview
Problem
Wireless stations (STAs) in WLAN systems face inefficiencies in battery power usage due to unsuitable timing for implementing receiver operating mode (ROM) changes, as they do not coordinate or consider battery usage when signaling ROM changes to access points (APs).
Innovation Solution
STAs negotiate and instruct APs on delay regimes for implementing ROM changes, allowing for immediate or delayed transmission according to the new ROM, thereby conserving battery power by selecting appropriate delay periods based on energy levels and AP status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a STA signals a ROM change to an AP without coordinating delay timing, then the ROM change can be implemented quickly, but the STA cannot optimize battery power usage
Solution Approach 1:
The STA performs preliminary actions by evaluating candidate delay regimes and selecting an optimal delay value before signaling the ROM change to the AP. This allows the STA to prepare the timing parameters in advance, ensuring that the ROM change is implemented at the most energy-efficient moment while maintaining coordination with the AP's transmission schedule.
Solution Approach 2:
The system introduces dynamic delay regimes that can be adjusted based on the STA's battery status and network conditions. The STA can select from multiple candidate delay values (e.g., immediate execution, deferred by one or more TIDs) and dynamically choose the optimal delay to balance power savings with communication latency requirements.
2Use of energy by moving object
If the STA waits for an optimal time to implement ROM change for power saving, then battery efficiency improves, but data transmission may be delayed
Solution Approach 1:
The STA changes the timing parameter (delay regime) based on its power state and network conditions. By adjusting the delay value in the ROM change indication, the STA can optimize between power consumption and transmission speed - selecting shorter delays when power is abundant and longer delays when power is constrained, thereby adapting the system's temporal behavior to current conditions.
3Speed
If the AP transmits data immediately after receiving ROM change indication, then transmission latency is reduced, but the STA may not have sufficient time to prepare for the mode switch
Solution Approach 1:
The STA performs preliminary preparation for the ROM change by evaluating candidate delay regimes and selecting an appropriate delay value before the AP transmits data. This preliminary action ensures that the STA has sufficient time to reconfigure its receiver operating mode before the actual data transmission begins, making the transition reliable while still maintaining relatively fast response times.
Data Source
AI summary
A wireless local area network station (STA) changes a receiver operating mode (ROM) and saves power by influencing when a ROM-conforming access point (AP) transmission takes place. The STA evaluates candidate delay regimes after a negotiation exchange with the STA. The STA then instructs the AP of a selected delay regime which the AP is permitted to use when transmitting data according to the changed ROM. The ROM can involve a change in the system bandwidth demodulated by the STA and/or the number of spatial streams demodulated by the STA. The delay regime can allow the AP to transmit with little or no delay based on the changed ROM, or the delay regime may require a fixed time delay before the AP transmits according to the changed ROM.