WUR Discovery Frame for Low-Power WLAN Scanning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless local area network (WLAN) devices face power consumption and performance issues due to scanning for nearby access points and location services, which can conflict with regular data exchange and introduce latency and power consumption.
Innovation Solution
A Wake-Up Radio (WUR) discovery frame is used to selectively transition the primary connectivity radio (PCR) from a lower-power mode to a higher-power mode, enabling efficient scanning and reducing power consumption by including operating class information, channel indices, and compressed identifiers, allowing for smart scanning and roaming decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the primary connectivity radio (PCR) is used for scanning and data communication, then communication performance and location services are improved, but power consumption increases significantly
Solution Approach 1:
The patent segments the radio functionality by introducing a Wake-Up Radio (WUR) that operates independently from the main PCR. The WUR handles scanning and wake-up functions while the PCR remains in low-power mode, dividing the overall radio system into two functional parts with different power consumption characteristics. This allows location services and scanning to be performed by the low-power WUR without activating the high-power PCR.
Solution Approach 2:
The WUR acts as an intermediary between the low-power state and the full PCR operation. Instead of directly activating the PCR for every scanning or wake-up event, the WUR first processes these events and only triggers PCR activation when necessary, serving as a mediator that reduces unnecessary high-power operations.
2Adaptability or versatility
If the PCR performs scanning on multiple channels, then access point discovery and roaming capabilities are improved, but latency and power consumption increase
Solution Approach 1:
The WUR performs preliminary scanning and channel assessment actions before the PCR is activated. By having the WUR pre-scan channels and identify potential access points while the device is in low-power mode, the system prepares roaming information in advance, reducing the time required when actual roaming or PCR activation is needed.
Solution Approach 2:
The system implements periodic scanning through the WUR at scheduled intervals rather than continuously activating the PCR. This periodic low-power scanning maintains roaming capabilities while significantly reducing overall power consumption and latency compared to continuous PCR operation.
3Reliability
If the PCR is activated for wake-up radio functions, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The WUR provides a simplified copy or subset of the full PCR functionality specifically for wake-up and scanning operations. Instead of using the complete high-power PCR for all functions, the system uses a dedicated low-power WUR copy that handles wake-up radio functions, reserving the full PCR capability for when it is truly needed for data communication.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An interface circuit in an electronic device (such as an access point) may provide a wake-up-radio (WUR) discovery frame for a recipient electronic device, where the WUR discovery frame includes an operating class of a wireless local area network (WLAN) associated with the electronic device. The operating class may specify a regulatory domain and a channel set of the WLAN. Moreover, the WUR discovery frame may include an index of a channel in the channel set. Furthermore, the WUR discovery frame may include a compressed or a partial identifier associated with the electronic device or the WLAN. The amount of compression may be based at least in part on a communication environment of the electronic device, such as a number of electronic devices, or a number of neighboring WLANs. Thus, the WUR discovery frame may have a variable size or length.