Wake-Up Signal Sub-Grouping for NB-IoT Paging Power Saving
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Solution Overview
Problem
Existing wireless communication technologies in Rel-15 eMTC and NB-IoT do not effectively support UE power saving by differentiating wake-up signals for individual UEs, leading to unnecessary power consumption when paging is intended for other UEs in the same group.
Innovation Solution
Implementing UE-group wake-up signal (WUS) sub-grouping mechanisms, including configuration and capability signaling, UE sub-group determination, and multiplexing methods to differentiate wake-up signals for different UE groups, using frequency, time, and code domain multiplexing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wake-up signal is used for multiple EDCs, then device complexity is reduced, but measurement precision deteriorates because the network cannot identify which specific EDC woke up the UE
Solution Approach 1:
The patent divides the wake-up signal into multiple independent groups, where each group corresponds to a specific EDC. This segmentation allows the network to identify which specific EDC triggered the wake-up by detecting which group contains the wake-up signal, thereby resolving the identification ambiguity while maintaining relatively simple signal structures.
2Measurement precision
If multiple wake-up signals are used for different EDCs, then EDC identification accuracy is improved, but device complexity increases due to multiple signal configurations
Solution Approach 1:
Instead of creating entirely separate wake-up signals for each EDC, the patent segments a single wake-up signal into multiple groups, where each group can indicate a different EDC. This approach achieves precise EDC identification while avoiding the complexity of configuring multiple independent signal structures.
Solution Approach 2:
The patent introduces a new dimension of differentiation by grouping wake-up signal repetitions into distinct groups associated with different EDCs. Rather than using multiple separate signals in time, the invention uses groups within a single signal structure, adding a grouping dimension that enables EDC identification without proportionally increasing overall signal complexity.
3Measurement precision
If wake-up signal monitoring is performed for all EDCs, then EDC identification accuracy is improved, but energy consumption increases for battery-powered UEs
Solution Approach 1:
The patent segments the wake-up signal monitoring process into distinct groups, where the UE only needs to monitor the group corresponding to its specific EDC. This segmentation allows battery-powered UEs to avoid monitoring all EDC groups, significantly reducing energy consumption while maintaining accurate EDC identification through targeted monitoring of the relevant group.
4Measurement precision
If multiple PDCCH monitoring occasions are used for different EDCs, then EDC identification accuracy is improved, but loss of time increases due to extended monitoring duration
Solution Approach 1:
The patent segments the PDCCH monitoring occasions into groups associated with different EDCs, allowing the network to identify which EDC woke up the UE by detecting which group contains the wake-up signal. This segmentation enables accurate EDC identification while limiting the total monitoring time to a single PDCCH occasion, avoiding the time loss that would result from monitoring multiple separate occasions.
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AI summary
Systems and methods are described for wake-up signaling of user equipment (UE). The systems and methods can include at least generating, by the BS, a wake up signal (WUS), wherein the WUS includes a length-131 Zadoff-Chu (ZC) sequence and a Gold sequence for radio equipment-level (RE-level) scrambling, and transmitting, by the BS, the WUS to a user equipment (UE) in a paging group associated with the WUS.