Wake-up Signal Multiplexing Using Manchester Coding
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Solution Overview
Problem
Current methods for concurrent wake-up signal transmission in wireless communication systems impose harder requirements on wake-up receiver implementation and are not transparent to unintended receivers, affecting system efficiency and complexity.
Innovation Solution
The use of Manchester coding allows for simple and flexible multiplexing of wake-up signals, enabling concurrent transmission that is transparent to the wake-up receiver and does not degrade link performance, even when multiple signals with different symbol rates are multiplexed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency division multiplexing is used to transmit multiple wake-up signals concurrently, then multiple devices can be woken up simultaneously, but the requirements on frequency reference generation accuracy and filter complexity increase
Solution Approach 1:
The patent segments the wake-up signal transmission by assigning different time offsets to different WUS in the same OFDM symbol. Instead of using frequency division multiplexing which requires complex filtering, the patent divides the transmission in the time domain within the same symbol structure, allowing multiple WUS to be transmitted concurrently without increasing frequency reference accuracy requirements or filter complexity.
Solution Approach 2:
The patent transitions from frequency domain multiplexing to time domain multiplexing within the same OFDM symbol. By introducing a time offset dimension while maintaining the same frequency resources, the patent achieves concurrent transmission of multiple WUS without the complexity penalties of FDM, effectively moving the multiplexing dimension from frequency to time.
2Productivity
If wake-up signal transmission uses the same frequency channel as user data, then frequency spectrum efficiency is improved, but the transmission time available for user data is reduced
Solution Approach 1:
The patent merges the wake-up signal transmission with the data transmission by embedding WUS within the same OFDM symbol structure used for data. The WUS and data share the same frequency channel and symbol timing, allowing concurrent transmission without sacrificing spectrum efficiency. The time offset mechanism ensures that WUS does not displace data transmission time.
3Productivity
If multiple wake-up signals are transmitted concurrently to wake up multiple devices, then system capacity utilization is improved, but the implementation complexity of wake-up receiver increases
Solution Approach 1:
The patent applies local quality by allowing different time offsets for different WUS within the same OFDM symbol. Each WUS is positioned at a specific time offset tailored to its intended receiver, enabling the WUR to selectively detect its designated WUS without being overwhelmed by other concurrent WUS. This localized time positioning simplifies the receiver implementation compared to detecting multiple FDM signals.
Data Source
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AI summary
A method of a network node is disclosed. The method is for concurrently transmitting two or more wake-up signals (WUS) using an signal generator applying an signal generator symbol rate, wherein each WUS is for reception by a wake-up receiver (WUR) of a respective wireless communication device. The method comprises selecting a respective Manchester coding symbol rate for each of the two or more WUS, wherein all of the selected respective Manchester coding symbol rates are different from each other, and wherein all Manchester codes having the selected respective Manchester coding symbol rates are orthogonal to each other. The method also comprises generating each of the two or more WUS using the signal generator and application of a Manchester code of the selected respective Manchester coding symbol rate, and multiplexing the two or more WUS for transmission in a WUS message. Corresponding arrangement, network node and computer program product are also disclosed, as well as counterparts for a wireless communication device.