Wakeup Packet Modulation Mitigating Interference
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Solution Overview
Problem
Power-constrained wireless devices in WLANs face inefficiencies in power management due to periodic 'wake-ups' to check for transmissions, even when no data is available, leading to unnecessary power consumption.
Innovation Solution
A method involving the generation and transmission of a wakeup packet with a WLAN legacy preamble, a wakeup radio preamble, and a data portion using orthogonal frequency division multiplexing (OFDM) symbols, where each time segment corresponds to an information bit and includes prefixes to mitigate intersymbol interference, prompting the WLAN network interface to transition from a low power state to an active state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WLAN network interface wakes up periodically to check for transmissions, then the device can receive data when available, but power consumption increases unnecessarily when no data is present
Solution Approach 1:
The system segments the network interface operation into two distinct modes: a low-power sleep mode where the interface remains inactive, and an active mode triggered only by a wakeup packet. This segmentation allows the device to maintain data reception capability while minimizing power consumption during periods when no data is transmitted.
Solution Approach 2:
The access point performs preliminary action by sending a wakeup packet before the actual data transmission. This preliminary signal prepares the receiving device in advance, allowing it to transition from sleep mode to active mode only when necessary, thereby avoiding unnecessary power consumption during idle periods.
2Speed
If the WLAN network interface remains in active state to immediately receive data, then data transmission speed is improved, but power consumption increases continuously
Solution Approach 1:
Instead of maintaining continuous active state, the system uses periodic wake-up triggered by external wakeup packets. The network interface transitions from sleep to active state periodically based on incoming wakeup signals, achieving a balance between responsiveness and power conservation.
Solution Approach 2:
The network interface dynamically adjusts its operational state based on incoming wakeup packets. Rather than maintaining a fixed active state, the interface transitions between sleep and active states dynamically, optimizing power consumption while maintaining the ability to receive data at high speed when needed.
3Use of energy by moving object
If a low power wakeup radio is used instead of the full WLAN network interface for monitoring, then power consumption is reduced, but the ability to receive and process data is limited
Solution Approach 1:
The wakeup packet serves as an intermediary signal between the access point and the low-power network interface. This intermediary carries essential information (such as destination address) that enables the simple wakeup radio to trigger the full network interface only when relevant data is incoming, thereby maintaining adaptability while minimizing power consumption.
Solution Approach 2:
The wakeup packet is designed to be self-sufficient in conveying critical information needed by the low-power interface. The packet includes sufficient data (such as destination address fields) for the simple wakeup radio to independently determine whether to activate the full network interface, enabling self-service operation without continuous high-power monitoring.
Data Source
AI summary
A first communication device generates and transmits a wakeup packet configured to cause a wakeup radio of a second communication device to prompt a wireless local area network (WLAN) network interface device of the second communication device to transition from a low power state to an active state. The wakeup packet is generated to include i) a WLAN legacy preamble, ii) a wakeup radio (WUR) preamble, and iii) a data portion. The data portion comprises a plurality of time segments, each time segment corresponds to a respective information bit. The data portion is generated to include a respective prefix inserted prior to each time segment corresponding to the respective bit to mitigate intersymbol interference at a receiver caused at least by multipath effects.