Wireless Beacon Signaling Using NDP Frames for Low-Power STAs
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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 (STAs) 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 (APs) broadcast a pre-determined frame, such as a null data packet (NDP) frame, to indicate the absence of buffered data traffic, allowing STAs to skip receiving beacon frames and return to sleep mode, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beacon frames are transmitted periodically to announce network presence and synchronize members, then network management and synchronization are improved, but power consumption increases due to frequent wake-up cycles
Solution Approach 1:
The patent applies preliminary action by sending a preliminary indication frame before the beacon frame to notify STAs about buffered data availability. This allows STAs to determine in advance whether they need to wake up for the beacon, thus reducing unnecessary wake-up cycles while maintaining proper network synchronization.
Solution Approach 2:
The patent segments the beacon transmission process into two parts: (1) a preliminary indication frame that provides early notification about data availability, and (2) the actual beacon frame that contains network management information. This segmentation allows STAs to make informed decisions about wake-up timing based on the indication frame.
2Loss of information
If STAs wake up regularly to receive beacon frames, then they can check for buffered data traffic, but power efficiency deteriorates when no data is available
Solution Approach 1:
The access point sends a preliminary indication frame before the beacon frame to notify STAs about buffered data availability. This preliminary notification allows STAs to skip wake-up cycles when no data is available, reducing energy waste while ensuring they don't miss important data notifications.
Solution Approach 2:
STAs use the indication frame information to self-determine whether they need to wake up for the beacon, eliminating unnecessary wake-up cycles and reducing energy consumption without requiring continuous monitoring.
3Speed
If beacon frames are extended in length for sub-1 GHz operation, then communication range is improved, but airtime consumption increases
Solution Approach 1:
The patent segments the information transmission into two separate frames: a short indication frame that provides early notification, and the extended beacon frame that contains comprehensive network information. This segmentation reduces the total airtime required compared to transmitting only full beacon frames periodically.
Solution Approach 2:
By transmitting the indication frame preliminarily before the beacon frame, the system reduces the effective airtime consumption of beacon operations, as STAs can return to sleep mode earlier when no data is available, reducing the functional airtime burden of extended beacon frames.
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 before broadcasting the beacon frame. A wireless communication device exits a low-power mode to receive an upcoming beacon frame or receive a pre-determined frame broadcast by the AP. Based on receiving the pre-determined frame, the wireless communication device determines that the upcoming beacon frame does not advertise buffered data traffic addressed to the wireless communication device and returns to the low-power mode after decoding at least a portion of the pre-determined frame.