Measurement Gap Deactivation Timing for DRX Wake-Up Overlap
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Solution Overview
Problem
In wireless communications systems, measurement gaps often overlap with discontinuous reception (DRX) cycles, leading to packet delay or loss due to missed wake-up signals (WUS) or failed measurement gap deactivation, resulting in inefficiencies and communication failures.
Innovation Solution
The proposed solution involves coordinating timing constraints for DRX cycles and measurement gaps by prioritizing measurement gap deactivation notifications, ensuring they are sent via downlink control information (DCI) within valid monitoring occasions before the measurement gap, and allowing for truncated on durations to accommodate frequency tuning during overlaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement gaps are configured for frequency tuning and measurements, then measurement accuracy is improved, but packet delay and loss increase due to overlap with DRX cycles and missed wake-up signals
Solution Approach 1:
The network entity sends a deactivation notification for the measurement gap before the measurement gap occurs, during a monitoring occasion that overlaps with the measurement gap. This preliminary action allows the UE to deactivate the measurement gap in advance, preventing packet delay and loss while maintaining measurement accuracy when needed
Solution Approach 2:
The measurement gap configuration is made dynamic through network control. The network entity can activate or deactivate measurement gaps based on current communication conditions by sending deactivation notifications during monitoring occasions, allowing the system to adapt between measurement accuracy and packet delivery reliability
2Loss of time
If measurement gaps overlap with monitoring occasions, then frequency tuning time is reduced, but wake-up signals may be missed causing communication failures
Solution Approach 1:
The deactivation notification is sent in advance during the monitoring occasion that overlaps with the measurement gap, before the actual measurement gap occurs. This allows the UE to prepare for frequency tuning without missing wake-up signals, as the measurement gap is deactivated beforehand
Solution Approach 2:
The deactivation notification acts as an intermediary mechanism between the monitoring occasion and the measurement gap. It enables the system to coordinate the transition from monitoring to measurement mode without conflict, ensuring wake-up signals are received before frequency tuning begins
3Loss of time
If deactivation notifications are sent during monitoring occasions before measurement gaps, then packet delay is reduced, but system complexity increases due to timing coordination requirements
Solution Approach 1:
The system changes the timing parameter of deactivation notification delivery, sending it during monitoring occasions that overlap with measurement gaps rather than at fixed intervals. This parameter change reduces packet delay while the complexity is managed through standardized timing relationships defined in the protocol
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling indicating on durations. The UE may receive, during a first monitoring occasion (MO), a wake-up signal (WUS) indicating for the UE to monitor during an on duration overlapping with a measurement gap; the UE may monitor for a measurement gap deactivation notification in a second MO, where an offset between the second MO and the measurement gap may satisfy a threshold. The UE may receive a deactivation notification in a first MO for a measurement gap overlapping with a second MO, where an offset between the deactivation notification and the measurement gap may satisfy a threshold; the UE may monitor for a WUS in the second MO, where a second offset between the second MO and an on duration may satisfy a second threshold. The UE may refrain from performing a monitoring procedure.