LP-WUS Target UE Differentiation for Low-Power Wake-Up Monitoring
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Solution Overview
Problem
Existing communication systems face challenges in achieving low power consumption while maintaining efficient operation, particularly in latency-critical use cases, due to the high power consumption associated with periodic wake-up times and reference signal processing.
Innovation Solution
Implementing a low-power wake-up signal (LP-WUS) system that allows for target UE differentiation and efficient switching between low-power and main radio operations, using simplified waveforms like OOK modulation and FSK, and configuring UEs with specific LP-WUS resources based on their RRC states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic wake-up times and reference signal processing are used to maintain efficient operation, then system responsiveness and reliability are improved, but power consumption increases
Solution Approach 1:
The patent segments the wake-up signal reception process by introducing a first radio frequency (RF) chain specifically dedicated to receiving wake-up signals, separate from the main RF chain used for normal communication. This segmentation allows the UE to process wake-up signals with minimal power consumption while maintaining system responsiveness, as the first RF chain operates independently and can be activated only when wake-up signals need to be received.
Solution Approach 2:
The patent implements periodic wake-up signal monitoring at specific monitoring occasions instead of continuous operation. The UE is configured to monitor wake-up signals only at predetermined periodic intervals, which significantly reduces power consumption compared to continuous monitoring while ensuring the system remains responsive to wake-up events. This periodic action allows the UE to enter low-power states between monitoring occasions.
2Loss of time
If continuous monitoring of wake-up signals is performed, then latency is reduced, but power consumption increases
Solution Approach 1:
The patent employs periodic monitoring at specifically configured wake-up signal monitoring occasions rather than continuous monitoring. These monitoring occasions are strategically positioned to ensure timely detection of wake-up signals while allowing the UE to remain in low-power states between occasions, thus achieving a balance between reduced latency and minimized power consumption.
Solution Approach 2:
The patent configures the UE in advance with specific monitoring occasions and parameters for wake-up signal detection. This preliminary configuration allows the UE to efficiently jump to active monitoring states at predetermined times without needing continuous monitoring, reducing both latency and power consumption by preparing the monitoring schedule beforehand.
3Productivity
If multiple UEs share the same wake-up signal resources, then resource efficiency is improved, but UE identification accuracy deteriorates
Solution Approach 1:
The patent applies local quality differentiation by assigning different RNTI values to different UEs or UE groups for wake-up signal identification. Each UE or group has its own specific RNTI configured by the network, allowing multiple UEs to share the same physical wake-up signal resources while maintaining accurate identification. The differentiation is applied locally at the identification layer rather than requiring separate physical resources for each UE.
Solution Approach 2:
The patent enables a single wake-up signal transmission to serve multiple UEs simultaneously by using group RNTI values. The wake-up signal can be addressed to individual UEs or groups of UEs using different RNTI configurations, allowing the same physical signal resources to fulfill multiple identification functions and improving overall resource efficiency while maintaining identification accuracy through RNTI-based differentiation.
Data Source
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AI summary
The disclosure relates to a user equipment, a network node device, and respective methods for a user equipment and a network node. More specifically, the user equipment comprises a transceiver and a circuitry. The transceiver, in operation, receives a low-power wake-up signal, LP-WUS, in a LP-WUS monitoring occasion. The circuitry, in operation, obtains a target UE identification associated with at least a part of the received LP-WUS, in case the target UE identification associated with at least a part of the received LP-WUS corresponds to the UE, performs a monitoring behavior based on the at least a part of the received LP-WUS.