Category-Based Wake-Up Signals for Targeted Deep-Sleep UE Discovery
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Solution Overview
Problem
Existing wake-up mechanisms for devices in deep sleep waste energy by waking up UEs that are not relevant for the requested function or service, particularly in scenarios where the presence of UEs is unknown and devices have varying power constraints.
Innovation Solution
Implement a category-based wake-up signal (C-WUS) that targets specific categories of UEs, encoded with category identifiers, allowing only relevant devices to wake up and minimize energy waste by excluding others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional wake-up signals are transmitted to all UEs in deep sleep, then all UEs can be woken up reliably, but energy is wasted on UEs that are not relevant for the requested function or service
Solution Approach 1:
The patent segments UEs into different categories based on their service requirements and characteristics. Each category is assigned a unique category identifier (ID), allowing the network to transmit targeted wake-up signals to specific categories rather than all UEs. This segmentation enables the network to wake up only the relevant UEs for a particular service, reducing energy waste while maintaining reliable wake-up for the intended targets.
Solution Approach 2:
The patent applies local quality by assigning different category IDs to different groups of UEs based on their specific service needs. The wake-up signal includes a category ID that matches the local characteristics of the target UE group. This allows the network to tailor the wake-up signal to the specific local requirements of each UE category, ensuring reliable wake-up for relevant UEs while ignoring others.
2Reliability
If wake-up signals are transmitted with high RF bandwidth and encoding to lower miss-detection rate, then wake-up reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements partial action by transmitting wake-up signals with just enough RF bandwidth and encoding to achieve reliable detection for the target category, rather than using maximum resources for all UEs. The category-based filtering allows the system to use minimal signal resources for each targeted group, reducing overall energy consumption while maintaining adequate detection reliability for the intended recipients.
3Loss of energy
If category-based wake-up signaling is implemented, then energy waste is reduced by targeting specific UE categories, but system complexity increases due to category management
Solution Approach 1:
The patent applies preliminary action by pre-configuring UE categories and assigning category IDs to UEs before the actual wake-up process. The network maintains a mapping between category IDs and UE groups in advance. When a wake-up signal needs to be sent, the network simply looks up the appropriate category ID and transmits it, avoiding complex real-time decisions. This preliminary categorization simplifies the operational complexity while maintaining energy efficiency.
Data Source
AI summary
Systems and methods are disclosed for category-based wake-up and discovery for devices in deep sleep. In one embodiment, a method performed by a radio node comprises determining a category of User Equipments (UEs) to be woken-up, where the category of UEs is one of a plurality of predefined or preconfigured categories of UE. The method further comprises generating a category wake-up signal (C-WUS) that is indicative of the category of UEs to be woken-up and broadcasting the C-WUS. In this manner, targeted discovery procedure can be performed for UEs that are in deep sleep and belong to a particular category such that energy is noted wasted on other UEs that are in deep sleep but do not belong to the particular category.