Wake-Up Signal Handling for DRX and PRS Reception in 5G UEs
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, user equipment (UE) operating in discontinuous reception (DRX) mode faces challenges in efficiently managing wake-up signals and downlink positioning reference signals (PRS) reception, leading to power consumption issues and potential missed communications during DRX cycles.
Innovation Solution
The implementation of a method where UE receives a wake-up signal indicating whether to skip the next ON duration of the DRX cycle, allowing it to remain in sleep mode or transition to ON mode to receive PRS, depending on PRS configuration and transmission characteristics, thereby optimizing power usage and communication monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UE remains in DRX sleep mode to save power, then power consumption is reduced, but PRS reception is missed
Solution Approach 1:
The network performs preliminary action by transmitting the wake-up signal before the DRX ON duration, allowing the UE to decide in advance whether to wake up for PRS reception or remain in sleep mode. This preliminary notification mechanism resolves the contradiction by enabling power-saving sleep mode while ensuring PRS reception through advance warning.
Solution Approach 2:
The system implements feedback through the wake-up signal that conveys network-side information about upcoming PRS transmissions to the UE. This feedback loop allows the UE to adjust its DRX state accordingly, balancing power consumption with reliable PRS reception based on actual network conditions.
2Reliability
If UE transitions to DRX ON mode to receive PRS, then positioning capability is maintained, but power consumption increases
Solution Approach 1:
The network transmits wake-up signals in advance of the DRX ON duration, allowing the UE to prepare for PRS reception only when necessary. This preliminary action enables the UE to maintain positioning capability by waking up only when PRS is actually transmitted, avoiding unnecessary power consumption during sleep periods.
Solution Approach 2:
The system dynamically adjusts the UE's DRX state based on real-time network conditions and PRS transmission schedules. The UE transitions between sleep mode and ON mode flexibly, optimizing the balance between positioning capability and power consumption according to actual communication needs rather than following a fixed schedule.
3Reliability
If UE monitors communication signals during DRX ON duration, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The network performs preliminary action by signaling wake-up events before the DRX ON duration, allowing the UE to monitor communication signals only when actually needed. This resolves the contradiction by enabling reliable communication monitoring during ON periods while minimizing power consumption during sleep periods through advance notification.
Solution Approach 2:
The wake-up signal mechanism provides feedback to the UE about upcoming communication activities, enabling intelligent decision-making about when to wake up for monitoring. This feedback loop optimizes the balance between communication reliability and power consumption by aligning UE wake-up periods with actual network transmission schedules.
Data Source
AI summary
A user equipment (UE) operating in a discontinuous reception (DRX) mode may receive a wake-up signal indicating that the UE may skip the next ON duration of the DRX cycle, i.e., the UE is instructed to not wake up during a next ON time during the DRX cycle to monitor communication signals, such as data signals or control signals. The UE may be configured to receive downlink (DL) positioning reference signals (PRSs), e.g., during the next ON duration of the DRX cycle. The UE respond to the PRS configuration and the wake-up signal by remaining in DRX sleep mode and not receiving the PRS or transitioning to DRX ON mode to receive the PRS during which the UE may monitor or not monitor communication signals. The location server may receive indications of the wake-up signal configuration and status from a base station or the UE.