UE-Specific Wakeup Signal Resource Occasions for DRX Power Savings
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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 between intended and unintended wakeup signals, allowing UEs to determine if a signal is meant for them, thereby reducing 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 in discontinuous reception mode, then power consumption is reduced, but UEs may incorrectly identify wakeup signals intended for other UEs, leading to unnecessary wake-up procedures
Solution Approach 1:
The patent segments the wakeup signal monitoring process into two distinct phases: a low-power monitoring phase where UEs listen for wakeup signals using a simplified receiver, and a full-power verification phase where UEs decode control channel information to confirm the signal is intended for them. This segmentation allows the UE to remain in low-power mode while still achieving reliable wakeup signal identification through the two-stage verification process.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a wake-up indicator bit within the control channel information. This intermediary element serves as a mediator between the wakeup signal detection and the actual wake-up action, allowing the UE to verify the signal's intended recipient before executing the wake-up procedure, thus preventing incorrect identifications while maintaining power efficiency.
2Speed
If UEs wake up upon detecting any wakeup signal, then responsiveness to data transmissions is improved, but power savings are reduced due to unnecessary wake-up procedures
Solution Approach 1:
The patent applies preliminary action by having the UE first detect the wake-up indicator bit before fully processing the control channel information. This preliminary detection allows the UE to prepare for potential wake-up while still in low-power mode, maintaining responsiveness. The UE then performs a preliminary verification step by checking the indicator bit before committing to a full wake-up sequence, thereby avoiding unnecessary wake-ups and preserving power savings.
3Measurement precision
If UEs implement UE-specific wakeup signal resource configurations, then wakeup signal identification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by configuring UE-specific parameters such as search space sets and monitoring occasions that are tailored to each user's specific needs and signal characteristics. Rather than using a uniform configuration for all UEs, the system adapts the wakeup signal monitoring parameters to match individual UE requirements, improving identification accuracy. This localized customization is implemented through the configuration of UE-specific search space sets and monitoring occasion patterns that are dynamically adjusted based on the UE's operational state and network conditions.
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.