UE-Group Wake-Up Signal Sub-Grouping for eMTC and NB-IoT Power Saving
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Solution Overview
Problem
Current wireless communication systems, such as Rel-15 eMTC and NB-IoT, face inefficiencies in UE power saving due to the lack of support for UE-group wake-up signals, which can lead to unnecessary UE wake-ups when paging is intended for other UEs within the same paging group.
Innovation Solution
The implementation of UE-group wake-up signal sub-grouping in Rel-16 eMTC and NB-IoT systems, allowing for configuration and capability settings to enable or disable UE-group WUS, determine UE sub-groups, and multiplex WUS for different UE groups, improving power saving by reducing unnecessary wake-ups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wake-up signal is used for all UEs in a paging group, then the system complexity is reduced and implementation is simplified, but UEs wake up unnecessarily when paging is intended for other UEs, leading to increased power consumption
Solution Approach 1:
The patent divides the paging group into multiple UE sub-groups and assigns different wake-up signal sequences to each sub-group. This segmentation allows UEs to identify whether their specific sub-group is being paged, preventing unnecessary wake-ups while maintaining manageable system complexity through structured organization.
Solution Approach 2:
Different wake-up signal sequences are assigned to different UE sub-groups based on their specific characteristics or identifiers. This local differentiation enables targeted paging where only relevant UEs wake up, optimizing power consumption without requiring complete system-wide complexity increases.
2Use of energy by moving object
If UE-group wake-up signal sub-grouping is implemented, then power saving is improved by reducing unnecessary wake-ups, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent modifies the wake-up signal parameter space by introducing sub-group specific sequences while maintaining the overall group structure. This allows power saving improvements through selective paging without requiring complete reconfiguration of the wake-up signal system, thus limiting the increase in configuration complexity.
3Measurement precision
If multiple wake-up signal sequences are used for different UE sub-groups, then the precision of paging delivery is improved, but the loss of information increases due to the need for UEs to monitor and distinguish multiple sequences
Solution Approach 1:
By segmenting UEs into sub-groups with distinct wake-up signal sequences, the patent improves paging delivery precision so that only intended UEs wake up. This reduces the overall information processing overhead at the network side and allows UEs to efficiently identify relevant paging without needing to process all possible paging information.
Data Source
AI summary
Techniques discussed herein can facilitate communication of group-based WUS(s) (Wake Up Signal(s)) for eMTC (enhanced Machine Type Communication) and/or NB (NarrowBand)-IoT (Internet of Things). One example embodiment is an apparatus configured to be employed in a UE (User Equipment), comprising: a memory interface; and processing circuitry configured to: determine a WUS group of a plurality of WUS groups, wherein the WUS group is associated with a first group WUS (Wake Up Signal) of a plurality of group WUSs; determine a starting subframe for the first group WUS; and monitor the starting subframe for the first group WUS, wherein the UE is configured to communicate via one or more of eMTC or NB (NarrowBand)-IoT.