Wake-Up Receiver Beam Tracking During UE Sleep Modes
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining beam alignment between network nodes and user equipment (UE) during extended periods of low power sleep modes, leading to degraded link quality and potential radio link failures.
Innovation Solution
The implementation of a wake up signal for beam tracking (WUT) allows user equipment (UE) to periodically wake up and perform beam quality measurements using a wake up receiver (WUR), triggering a beam recovery procedure if the quality falls below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wake-up signals are used for power reduction in discontinuous reception modes, then power consumption is reduced, but beam alignment deteriorates leading to degraded link quality
Solution Approach 1:
The system performs preliminary beam tracking by having the wake-up receiver measure the quality of wake-up signals for beam tracking (WUTs) before the main receiver is fully activated. This preliminary action maintains beam alignment information without requiring continuous main receiver operation, thus preserving link quality while reducing power consumption.
Solution Approach 2:
The wake-up receiver serves as an intermediary device that performs beam tracking measurements on WUTs without requiring full main receiver activation. This intermediary approach allows beam alignment to be maintained through WUT quality measurements while the main receiver remains in low-power state, resolving the contradiction between power reduction and link quality maintenance.
2Reliability
If wake-up receiver is activated periodically for beam tracking, then beam alignment is maintained, but device complexity increases
Solution Approach 1:
The receiver functionality is segmented into two distinct parts: a simplified wake-up receiver (WUR) dedicated to beam tracking measurements on WUTs, and the main receiver for full communication operations. This segmentation allows the WUR to be a low-complexity device that only performs essential beam tracking functions, while maintaining beam alignment through periodic WUT measurements.
Solution Approach 2:
The beam tracking function is extracted from the main receiver and assigned to the separate wake-up receiver. This extraction allows the main receiver to focus on communication operations while the WUR handles beam tracking independently, reducing the complexity burden on each individual component while maintaining overall beam alignment capability.
3Productivity
If multiple parallel wake-up receivers are used for beam tracking, then network capacity increases, but device complexity increases
Solution Approach 1:
Multiple parallel wake-up receivers are merged into a unified beam tracking system where each WUR can independently measure WUT quality. This merging allows the system to process multiple beams simultaneously, increasing network capacity and throughput while the individual WURs remain relatively simple in design.
Solution Approach 2:
The wake-up receivers are designed with multi-functionality, capable of handling multiple beam tracking operations and serving different communication purposes. This universality allows a single WUR design to be replicated and deployed in parallel configurations, increasing network capacity without requiring complex specialized designs for each receiver.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, using at least one wake up receiver associated with the UE, one or more wake up signals for beam tracking (WUTs). The UE may measure a quality of each WUT, of the one or more WUTs. The UE may activate a main receiver associated with the UE to perform a beam recovery procedure based at least in part on a measured quality of at least one WUT, of the one or more WUTs. Numerous other aspects are described.