Wake-Up Signal Sequence Design for Wireless Communication
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception, particularly in identifying wake-up signals (WUS) due to overlapping time/frequency resources among adjacent channels, leading to unnecessary power consumption and incorrect channel monitoring.
Innovation Solution
A method and apparatus that utilize a WUS sequence defined by consecutive OFDM symbols and subcarriers, with specific patterns for different frequency bands, allowing communication devices to distinguish and detect physical channels effectively, including the use of Zadoff-Chu sequences and scrambling techniques to differentiate between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wake-up signal resources are shared across multiple frequency bands using the same time/frequency pattern, then resource utilization efficiency is improved, but signal detection accuracy deteriorates due to overlapping resources
Solution Approach 1:
The patent segments the wake-up signal resources by introducing band-specific parameters. Different frequency bands (e.g., low band, mid band, high band) are assigned distinct WUS sequence patterns, cyclic shifts, or scrambling codes. This segmentation allows each band to have unique detectable characteristics while sharing the same time/frequency resource grid, thereby maintaining detection accuracy without sacrificing resource efficiency.
Solution Approach 2:
The patent applies local quality by making the WUS sequence properties band-dependent. Specifically, the cyclic shift value, root index, or scrambling code used for WUS generation is locally adapted to each frequency band's characteristics. This ensures that each band's WUS has optimal detection performance tailored to its local conditions while maintaining overall system resource efficiency.
2Reliability
If communication devices monitor all frequency bands continuously to detect wake-up signals, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements preliminary action by having devices perform selective band monitoring based on pre-configured band-specific WUS parameters. Devices can be configured to monitor only specific frequency bands where their WUS sequences are expected, rather than continuously scanning all bands. This preliminary configuration enables reliable detection while significantly reducing power consumption by limiting monitoring scope.
Solution Approach 2:
The patent applies partial action by enabling devices to monitor a subset of frequency bands rather than all bands continuously. Based on the band-specific WUS sequence patterns and device configuration, each device monitors only the relevant bands where its wake-up signals may appear, achieving sufficient detection reliability with reduced energy expenditure compared to full-band continuous monitoring.
3Area of stationary object
If wake-up signal sequences are transmitted in all OFDM symbols to ensure coverage, then signal coverage is improved, but interference with other channels increases
Solution Approach 1:
The patent segments the WUS transmission across different OFDM symbols by assigning band-specific patterns to different symbol positions. Instead of using identical sequences in all symbols, the WUS sequences are segmented such that low-band WUS appears in certain symbols while high-band WUS appears in other symbols. This segmentation provides coverage across all symbols while reducing intra-band interference through frequency separation.
Solution Approach 2:
The patent resolves the coverage-interference contradiction by adding a frequency dimension to the time-domain symbol distribution. WUS sequences are transmitted across all OFDM symbols (maintaining time-domain coverage) but are frequency-multiplexed with band-specific patterns (adding frequency dimension). This dimensional approach allows full symbol coverage while minimizing interference through frequency separation.
Data Source
AI summary
The present invention relates to a wireless communication system and, particularly, to a method and a device therefor, the method comprising the steps of: receiving a WUS sequence in a WUS resource on a carrier, wherein the WUS resource is defined as a plurality of consecutive OFDM symbols and a plurality of consecutive subcarriers; and attempting to detect a physical channel corresponding to the WUS, wherein the WUS sequence exists in the same pattern regardless of the position of a frequency band of the carrier, in the Nth (N>1) to last OFDM symbols of the WUS resource, and the WUS sequence exists selectively on the basis of the position of the frequency band of the carrier, in the first to (N−1)th OFDM symbols of the WUS resource.