Wake-Up Packet Power Modulation for Wireless Coexistence
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Solution Overview
Problem
Low-power wake-up receivers in wireless local-area networks face challenges in coexistence with legacy stations due to potential missed legacy preambles, leading to collisions and inefficient power management, especially when third-party stations fail to detect wake-up packets.
Innovation Solution
The implementation of a low-power wake-up (LP-WU) packet structure with a legacy preamble and a wake-up portion, where the wake-up portion is modulated using On-Off-Keying (OOK) and transmitted at a higher power level than the legacy preamble to ensure detection by third-party stations, maintaining an average received power equal to the legacy preamble, thereby preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the wake-up portion is transmitted at the same power level as the legacy preamble, then power consumption is reduced, but third-party stations cannot detect the wake-up packets leading to collisions
Solution Approach 1:
The patent applies local quality by differentiating transmit power levels across different portions of the wake-up packet. The legacy preamble is transmitted at a first power level for broad compatibility, while the wake-up portion is transmitted at a higher second power level to ensure detection by third-party stations. This localized power differentiation resolves the contradiction between power consumption and detection reliability.
Solution Approach 2:
The patent changes the power level parameter for different segments of the transmission. By adjusting the transmit power from the first level (for legacy preamble) to the second higher level (for wake-up portion), the system ensures that third-party stations can detect the wake-up packets while maintaining compatibility with legacy devices, thus resolving the detection reliability issue without excessive power consumption.
2Reliability
If the wake-up portion is transmitted at a higher power level, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating transmit power levels across different portions of the wake-up packet. The legacy preamble is transmitted at a first power level for broad compatibility, while the wake-up portion is transmitted at a higher second power level to ensure detection by third-party stations. This localized power differentiation resolves the contradiction between power consumption and detection reliability.
Solution Approach 2:
The patent applies partial action by transmitting only the critical wake-up portion at the higher power level, rather than the entire packet. The legacy preamble uses standard power levels, while only the wake-up portion that requires enhanced detection uses the higher second power level. This partial application of increased power minimizes overall energy consumption while ensuring reliable detection where needed.
3Adaptability or versatility
If low-power wake-up receivers operate with legacy station protocols, then compatibility is improved, but collision risk increases due to missed preambles
Solution Approach 1:
The patent applies universality by designing a wake-up packet structure that serves multiple functions: the legacy preamble portion ensures compatibility with legacy station protocols and enables legacy devices to recognize the transmission, while the wake-up portion uses enhanced power levels to ensure detection by third-party stations. This multi-functional design resolves the contradiction between compatibility and collision avoidance.
Solution Approach 2:
The legacy preamble acts as an intermediary element that bridges between legacy station protocols and the wake-up receiver system. It allows legacy devices to detect the presence of a transmission and set their network allocation vector (NAV), preventing them from transmitting during the wake-up packet duration. This intermediary structure enables protocol compatibility while preventing collisions through proper medium access control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances system performance by ensuring that third-party stations can detect wake-up packets and avoid collisions, improving power management and coexistence between low-power wake-up receivers and legacy stations.
Implementation Method 1
transmit the wake-up portion using a second transmit power level higher than the first transmit power level by a predetermined amount such that an average received power of the wake-up portion is equal to an average received power of the legacy portion at the third-party station
Data Source
AI summary
A wireless communication system and method. The system includes processing circuitry, and a transceiver coupled to the processing circuitry. The processing circuitry includes logic to generate a wake-up packet addressed to another wireless communication system and including a legacy preamble portion and a wake-up portion, the legacy preamble portion modulated according to a first modulation rate. The wake-up portion is modulated according to a second modulation rate lower than the first modulation rate and includes information to wake-up the other wireless communication system. The transceiver system is to transmit the legacy preamble using a first transmit power level, and to transmit the wake-up portion using a second transmit power level higher than the first transmit power level by a predetermined amount such that an average received power of the wake-up portion is equal to an average received power of the legacy portion at the third-party station.