Wireless Beacon Skipping Using NDP Frames for Lower Power
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Solution Overview
Problem
Existing wireless networks, particularly those operating in the sub-1 GHz band like 802.11ah, face significant power consumption issues due to the need for stations to regularly wake up to receive beacon frames, even when no buffered data is available, leading to inefficient power usage.
Innovation Solution
Implementing a method where wireless access points check for buffered data traffic before transmitting beacon frames and broadcast a pre-determined frame, such as a null data packet (NDP) when no data is available, allowing stations to skip unnecessary wake-ups and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beacon frames are transmitted periodically at regular intervals, then network synchronization and presence announcement are maintained, but power consumption increases due to unnecessary receiver activations when no data is available
Solution Approach 1:
The access point performs preliminary action by checking for buffered data traffic before transmitting the beacon frame. This advance check allows the system to prevent unnecessary beacon transmissions when no data is available, thereby reducing power consumption while maintaining network synchronization when needed.
Solution Approach 2:
The beacon transmission schedule is made dynamic rather than fixed. The access point adjusts beacon transmission based on real-time data availability conditions, transmitting beacons only when necessary (when data is buffered or synchronization is required), thus optimizing the balance between reliability and power consumption.
2Loss of information
If stations wake up regularly to receive beacon frames, then network presence and buffered data information are obtained, but battery life decreases due to frequent power state transitions
Solution Approach 1:
The access point checks for buffered data traffic in advance before transmitting beacons. This preliminary action allows stations to remain in sleep mode longer without missing critical information, as they only need to wake up when the access point actually has data to communicate, thereby extending battery life while ensuring information availability.
Solution Approach 2:
The system uses feedback mechanisms where the access point's knowledge of buffered data status controls beacon transmission. Stations receive feedback about data availability through the presence or absence of beacon frames, allowing them to optimize their power state transitions based on actual network conditions rather than fixed schedules.
3Reliability
If beacon frames are transmitted at fixed intervals, then network synchronization is maintained, but airtime is wasted when most networks are idle
Solution Approach 1:
The access point performs a preliminary check of buffered data traffic before committing to beacon transmission. This advance verification prevents wasted airtime by ensuring beacons are only transmitted when there is actual network activity or synchronization need, thereby improving overall airtime efficiency while maintaining necessary network functions.
Solution Approach 2:
The beacon transmission parameter (transmission interval) is changed dynamically based on network conditions. Instead of fixed intervals, the system adjusts transmission frequency according to data availability and synchronization requirements, optimizing airtime utilization while preserving network synchronization reliability.
Data Source
AI summary
Systems and techniques are provided for performing wireless communications. In some aspects, an access point (AP) determines if buffered data traffic is available that will be advertised to one or more wireless communication devices using a beacon frame scheduled for broadcast by the AP. The AP broadcasts a pre-determined frame in response to determining buffered data traffic is not available, and the AP may skip broadcasting an upcoming beacon frame associated with the pre-determined frame. For example, the AP broadcasts the upcoming beacon after broadcasting the pre-determined frame when there is a change of configuration or when a resynchronization interval associated with the one or more wireless communication devices has been exceeded.