Wake-Up Signal Beam Alignment for 5G DRX Control Reception
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Solution Overview
Problem
In 5G New Radio systems using high-frequency frequencies, beam blocking leads to communication failures due to high pathloss, necessitating improved control channel reception methods to maintain connectivity and reduce power consumption.
Innovation Solution
Implementing a wake-up signal (WUS) prior to a control channel using a shared quasi-colocated beam source, ensuring consistent spatial quasi-colocated sources for control resource sets during discontinuous reception periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to overcome high pathloss in high-frequency 5G systems, then communication reliability is improved, but beam blocking causes communication failures when beams are blocked
Solution Approach 1:
The system transmits a wake-up signal before the DRX ON period to prepare the UE for upcoming control channel reception. This preliminary action ensures that the UE is properly positioned and ready to receive control channels even if beam conditions change during the DRX ON period, thereby maintaining communication reliability despite potential beam blocking.
Solution Approach 2:
The system uses the wake-up signal as a feedback mechanism to inform the UE about upcoming control channel transmissions. By monitoring the wake-up signal, the UE can adjust its reception parameters and maintain proper beam alignment, providing feedback that helps overcome beam blocking issues and ensures reliable communication.
2Use of energy by moving object
If discontinuous reception (DRX) is implemented to save power consumption, then energy efficiency is improved, but control channel detection probability decreases due to power save mode limitations
Solution Approach 1:
The wake-up signal is transmitted before the DRX ON period as a preliminary action to alert the UE about upcoming control channels. This allows the UE to wake up early and properly position itself for control channel reception, maintaining high detection probability while still benefiting from power savings during DRX OFF periods.
Solution Approach 2:
The wake-up signal acts as an intermediary between the network and the UE during DRX operation. It serves as a bridge that informs the UE about upcoming control channel transmissions without requiring continuous monitoring, thus maintaining reliable control channel detection while preserving power consumption benefits of DRX mode.
3Adaptability or versatility
If multiple CORESETs are used during DRX ON period, then control channel reception flexibility is improved, but beam alignment consistency becomes difficult to maintain
Solution Approach 1:
The wake-up signal is transmitted using a first beam as a preliminary action before the UE needs to receive control channels on multiple CORESETs. This preliminary beam transmission establishes a reference for the UE to maintain consistent beam alignment across multiple CORESETs during the DRX ON period, thereby preserving both flexibility and alignment consistency.
Solution Approach 2:
The system applies different beam configurations for different CORESETs while maintaining overall beam alignment consistency through the wake-up signal. Each CORESET can be optimized for its specific reception requirements while the wake-up signal ensures that the fundamental beam alignment remains consistent across all CORESETs, achieving both local optimization and global stability.
Data Source
AI summary
A method implemented by an access node includes transmitting, by the access node, a wake up signal (WUS) prior to a control channel occurring within an associated discontinuous reception (DRX) ON period, wherein the WUS is transmitted using a first beam, and transmitting, by the access node, the control channel during the associated DRX ON period, wherein the control channel is transmitted on a control resource set (CORESET) using a second beam, wherein the first and second beams share a common quasi-colocated (QCL) source.