Multi-Link Power Save Mode for Wireless Stations
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Solution Overview
Problem
Existing methods for listening to beacon frames during multi-link power save mode in wireless communication networks face inefficiencies, leading to delayed data delivery and unused allocated resources, particularly for latency-sensitive traffic.
Innovation Solution
Implementing a dual power save mode mechanism where stations affiliated with a non-AP multi-link device wake up to listen for beacon frames at specific intervals, with a first mode for immediate data retrieval and a second mode for periodic listening based on a timer, to optimize data access and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If stations wake up frequently to listen for beacon frames, then data delivery timeliness is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic power save mode switching between first and second modes based on data availability conditions. The station transitions from first power save mode (shorter interval, lower latency) to second power save mode (longer interval, lower power consumption) when data is available, and vice versa when no data is available. This dynamic adaptation resolves the contradiction by adjusting listening frequency based on actual data delivery needs.
Solution Approach 2:
The patent changes the beacon frame listening interval parameter based on power save mode. In the first power save mode, stations listen at shorter intervals to ensure timely data delivery. In the second power save mode, stations listen at longer intervals to reduce power consumption. The system switches between these parameter configurations based on data availability, resolving the time-energy tradeoff.
2Use of energy by moving object
If stations use fixed listening intervals, then power consumption is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent makes the beacon frame listening interval dynamic by introducing two different intervals corresponding to two power save modes. The station adapts its listening behavior based on data availability conditions, switching between first and second power save modes. This dynamic adjustment improves resource utilization efficiency while maintaining power consumption benefits, resolving the contradiction between fixed intervals and resource efficiency.
Solution Approach 2:
The system uses feedback from data availability conditions to adjust listening intervals. When data is available, the station switches to first power save mode with shorter intervals to ensure timely retrieval. When no data is available, it switches to second power save mode with longer intervals to save power. This feedback mechanism resolves the contradiction by optimizing both power consumption and resource utilization based on actual network conditions.
3Use of energy by moving object
If stations wake up at longer intervals, then power consumption is reduced, but data delivery latency increases
Solution Approach 1:
The patent implements dynamic switching between first and second power save modes based on data availability. When data is available, the station uses the first power save mode with shorter listening intervals to minimize latency. When no data is available, it uses the second power save mode with longer intervals to reduce power consumption. This dynamic behavior resolves the contradiction between power saving and latency.
Solution Approach 2:
The patent changes the beacon frame listening interval parameter based on the power save mode state. The first power save mode uses a shorter interval parameter to reduce latency when data is present. The second power save mode uses a longer interval parameter to reduce power consumption when no data is present. Switching between these parameter values resolves the time-energy contradiction.
4Use of energy by moving object
If stations use aggressive power save mode, then power consumption is reduced, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent implements dynamic power save mode selection based on data availability conditions and traffic priorities. The station switches between first and second power save modes, and the access point adjusts resource allocation accordingly. This dynamic coordination resolves the contradiction by ensuring that aggressive power saving does not compromise resource allocation efficiency for latency-sensitive traffic.
Solution Approach 2:
The system uses feedback from data availability conditions and traffic priority information to coordinate power save mode selection with resource allocation. When the station selects second power save mode (more aggressive power saving), the access point adjusts resource allocation to maintain efficiency. This feedback mechanism resolves the contradiction between power saving aggressiveness and resource allocation efficiency.
Data Source
AI summary
A non-access point multi-link device (non-AP MLD) receives from an access point multi-link device (AP MLD), while in a first power save mode, a beacon frame comprising a traffic indication map (TIM) element indicating downlink buffered units (BUs) for the non-AP MLD, where during the first power save mode the non-AP MLD wakes to listen for beacon frames on one of enabled links at least once within a listen interval. After receiving the downlink BUs from the AP MLD, the non-AP MLD switches to a second power save mode, where during the second power save mode the non-AP MLD wakes to listen for beacon frames at each target beacon transmission time (TBTT) on the enabled links until a timer expires.