Wake-Up Radio Multi-Antenna Spatial Mapping
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting wake-up requests to low power devices using multiple antennas, as existing standards do not define a multi-antenna modulation and transmission format for wake-up radio packets, leading to potential unintentional spatial nulling and conflicts between low power consumption and low latency.
Innovation Solution
The method involves configuring a wake-up radio packet with spatial mapping to prevent unintentional spatial nulling by adjusting the waveform at each antenna, using techniques such as phase rotation, frequency shift, and content variation, to ensure effective transmission of wake-up radio packets to low power devices in a wireless local area network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If duty-cycled operations are used to maintain connection between access point and low power device, then power consumption is reduced, but latency increases when device needs to be awakened
Solution Approach 1:
The access point transmits a wake-up radio packet before the low power device needs to be awakened, preliminarily notifying the device to prepare for data reception. This preliminary action allows the device to wake up in advance without extending the duty cycle, thus maintaining low power consumption while reducing latency.
2Reliability
If multiple antennas are used for wake-up radio transmission, then transmission reliability is improved, but unintentional spatial nulling occurs due to lack of defined multi-antenna modulation format
Solution Approach 1:
The patent applies spatial mapping techniques that modify the waveform parameters (phase, frequency, content) at each antenna based on channel conditions. By dynamically changing these parameters, the system achieves reliable multi-antenna transmission without requiring a completely new modulation format, thus improving reliability while maintaining compatibility with existing standards.
Solution Approach 2:
The system dynamically adjusts the wake-up radio transmission parameters at each antenna based on real-time channel conditions and spatial information. This dynamic adaptation allows the multi-antenna system to avoid spatial nulling and maintain high reliability without requiring static pre-defined modulation formats.
Data Source
AI summary
Embodiments described herein provide a method for transmitting a wake-up radio packet to low power devices in a wireless local area network. At a wireless access point having a plurality of antennas, data for transmission to one or more lower power wireless devices are received. A wake-up radio packet, including a wake-up data frame, is configured for transmission to the one or more lower power wireless devices. A waveform for transmitting the wake-up radio packet is generated. At each of the plurality of antennas, the waveform is adjusted with spatial mapping to prevent unintentional spatial nulling of the waveform during transmission of the wake-up radio packet. The wake-up radio packet is transmitted, via the plurality of antennas, in a form of the adjusted waveform to the one or more lower power wireless devices prior to transmitting the received data to the one or more lower power wireless devices.