Dynamic Wake-Up Signal Configuration for DRX Power Optimization
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Solution Overview
Problem
Wireless communication devices face challenges in balancing power savings with communication latency and throughput during discontinuous reception (DRX) and discontinuous transmission (DTX) operations, particularly when a wake-up signal (WUS) is not received from a base station.
Innovation Solution
Implementing a default wake-up configuration that allows user equipment (UE) to dynamically or semi-statically choose between skipping or actively performing physical downlink control channel (PDCCH) monitoring during wake-up occasions, based on whether a WUS is received, to optimize power savings and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE actively performs PDCCH monitoring during every on-duration in DRX operation, then communication latency and throughput are improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic wake-up behavior where the UE adapts its PDCCH monitoring activity based on received wake-up signals. The UE can switch between active monitoring and sleep modes dynamically, allowing the system to optimize the balance between communication responsiveness and power consumption based on current traffic conditions.
Solution Approach 2:
The patent changes the monitoring parameter (PDCCH monitoring activity) based on external signaling. When a wake-up signal is received, the UE activates PDCCH monitoring; when no wake-up signal is received, the UE skips monitoring. This parameter change allows the system to adapt power consumption levels while maintaining communication capability when needed.
2Use of energy by moving object
If the UE skips PDCCH monitoring during on-duration to save power, then power consumption is reduced, but communication latency increases
Solution Approach 1:
The patent uses wake-up signals as preliminary indicators that prepare the UE for potential communication activity. By receiving a wake-up signal before the on-duration, the UE is alerted in advance to activate PDCCH monitoring, ensuring it is ready to communicate immediately when data is available, thus avoiding latency while still saving power during idle periods.
Solution Approach 2:
The system implements feedback through wake-up signals sent from the network to the UE. This feedback mechanism informs the UE about upcoming data transmissions, allowing the UE to adjust its monitoring behavior accordingly. The feedback loop ensures the UE activates monitoring only when necessary, balancing power savings with communication responsiveness.
3Reliability
If the base station transmits wake-up signals during every WUS occasion, then communication reliability is improved, but network traffic and interference increase
Solution Approach 1:
The patent extracts the essential function of wake-up signaling by transmitting wake-up signals only when necessary, rather than during every WUS occasion. The network selectively sends wake-up signals only when there is actual data to transmit, removing unnecessary signaling overhead while maintaining the reliability needed for communication.
Solution Approach 2:
The system applies partial action by transmitting wake-up signals only for a subset of WUS occasions - specifically, only when there is downlink data available. This partial transmission approach avoids the excessive signaling that would occur with continuous wake-up signal transmission, reducing network traffic and interference while maintaining adequate communication reliability.
Data Source
AI summary
Wireless communication devices, systems, and methods related to handling wake-up behavior for power saving, including during discontinuous reception (DRX) operation are provided. For example, a method of wireless communication includes transmitting, by a base station (BS) to a user equipment (UE), a default wake-up configuration associated with a discontinuous reception (DRX) operation; determining, by the BS, whether to transmit a wake-up signal (WUS) to the UE during a WUS occasion based on a traffic load; and transmitting, by the BS, a physical downlink control channel (PDCCH) signal during a duration associated with the WUS occasion.