Wakeup Signal Resource Configuration for UE Power Saving
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Solution Overview
Problem
In wireless communications systems, UEs operating in discontinuous reception (DRX) mode experience reduced power savings due to incorrectly identifying wakeup signals intended for other UEs, leading to unnecessary wake-up procedures.
Innovation Solution
Implementing UE-specific or UE group-specific wakeup signal resource configurations, including time, frequency, and decoding parameters, to differentiate intended signals and reduce unnecessary wake-ups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs monitor for wakeup signals using a low complexity receiver to reduce control channel monitoring frequency, then power consumption is reduced, but UEs may incorrectly identify wakeup signals intended for other UEs leading to unnecessary wake-ups
Solution Approach 1:
The patent divides the control channel monitoring function into two separate receivers: a low complexity receiver for monitoring wakeup signals in low power mode, and a high complexity receiver for monitoring control channels in active mode. This segmentation allows the UE to use appropriate receiver complexity for each function, preventing unnecessary wake-ups while maintaining power savings.
Solution Approach 2:
The patent introduces a wake-up indicator as an intermediary signal that the low complexity receiver monitors. This indicator serves as a mediator between the base station and UE, enabling the UE to determine whether to transition to active mode without using the full complexity receiver, thus improving reliability of wakeup signal identification while maintaining power efficiency.
2Reliability
If UEs wake up to monitor control channel for data availability, then data transmission reliability is improved, but power savings are reduced due to unnecessary wake-ups
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors wake-up indicators from the base station and uses this feedback information to determine whether to transition to active mode. The UE only wakes up when the wake-up indicator confirms data is available, eliminating unnecessary wake-ups while maintaining data transmission reliability.
Solution Approach 2:
The patent performs preliminary monitoring of wake-up indicators using the low complexity receiver before transitioning to active mode. This preliminary action allows the UE to prepare for potential data reception without committing to full active mode operation, thereby avoiding unnecessary power consumption while ensuring reliable data transmission when needed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Some wireless communications systems support user equipment (UEs) achieving power savings by operating in a connected discontinuous reception (C-DRX) mode. The systems may additionally utilize wakeup signals for further power savings at a UE. For example, a UE may be configured with a wakeup signal resource configuration (e.g., a first search space configuration) for monitoring for wakeup signals while operating in a low power mode. This first search space configuration may be different from a second search space configuration for the UE operating in an active mode. When in a low power mode, the UE may monitor for wakeup signals according to the wakeup signal resource configuration. If the UE receives a wakeup signal in a wakeup signal resource defined by the configuration, the UE may initiate a wakeup procedure and transition to the active mode for data transmission and reception.