UE Scheduling Offset Adaptation for PDCCH Miss-Detection
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Solution Overview
Problem
Conventional methods for dynamically adapting scheduling parameters to achieve power savings in user equipment (UE) do not adequately address the issue of erroneous detection of PDCCH-based power saving channels, leading to unsynchronized resource allocation and inefficient power consumption.
Innovation Solution
Implementing a mechanism for handling miss-detection of PDCCH-based power saving channels by using a validity timer or HARQ ACK feedback, and dynamically adjusting scheduling offsets to ensure synchronized UE-gNB resource allocation, enabling micro-sleep and reducing power waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UE uses dynamically adapted minimum slot offsets to switch to microsleep after PDCCH reception, then power consumption is reduced, but erroneous detection of PDCCH-based power saving channels occurs leading to unsynchronized resource allocation
Solution Approach 1:
The network pre-configures multiple minimum slot offset values (first minimum slot offset, second minimum slot offset, etc.) before dynamic adaptation begins. These pre-configured values serve as a foundation that allows the UE to reliably detect and switch between different offset values without erroneous detection, while still enabling power saving through microsleep when appropriate offsets are applied.
Solution Approach 2:
The minimum slot offset value is made dynamically adaptable rather than fixed. The network can update the minimum slot offset value dynamically based on traffic conditions and UE power saving needs, allowing the system to optimize between power consumption and detection reliability in real-time. This dynamic adaptation enables the UE to switch to microsleep when larger offsets are applied while maintaining reliable detection through proper configuration management.
2Use of energy by moving object
If UE switches to microsleep after PDCCH reception, then power consumption is reduced, but resource allocation synchronization between UE and gNB deteriorates
Solution Approach 1:
The system implements feedback mechanisms where the network monitors UE detection status and resource allocation synchronization. When miss-detection occurs or synchronization is lost, the network can adjust the minimum slot offset values or reconfigure parameters to restore proper synchronization. This feedback loop ensures that power saving operations do not compromise resource allocation coordination between UE and gNB.
Solution Approach 2:
The network pre-configures multiple minimum slot offset values that are designed to maintain synchronization while enabling microsleep. By having pre-configured offset values that account for different microsleep scenarios, the system ensures that resource allocation remains synchronized even when the UE enters microsleep state, preventing information loss and allocation errors.
3Device complexity
If conventional methods are used for dynamic scheduling parameter adaptation, then implementation is simple, but power saving efficiency is insufficient due to erroneous detection issues
Solution Approach 1:
The network pre-configures multiple minimum slot offset values before dynamic adaptation begins. This preliminary configuration provides a reliable foundation that reduces erroneous detection while maintaining reasonable implementation complexity. The pre-configured values eliminate the need for complex real-time detection algorithms while still enabling effective power saving through microsleep.
Solution Approach 2:
The system changes the minimum slot offset parameter dynamically based on traffic conditions and power saving requirements. By adjusting this parameter rather than implementing complex detection and correction mechanisms, the system achieves improved power saving efficiency with minimal increase in implementation complexity. The parameter change approach is simpler than adding complex error detection and correction protocols.
Data Source
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AI summary
A method and apparatus for dynamically adapting scheduling parameter(s) to achieve power savings. A user equipment may be configured with one or more offsets between scheduled PDCCH and PDSCH transmissions. The user equipment may receive from a network an indication to dynamically change these offsets. If the user equipment sleeps through a first transmission of this indication, upon next receiving the indication the user equipment may update, for example, the offset in a time domain resource allocation table. The indication to dynamically change an offset may be an indication of an offset comprising fewer slots. A change to the offset, with which downlink transmission is expected by the user equipment, may be disabled. A network node may be configured to transmit downlink traffic to the user equipment according to a configured offset and/or according to an offset the network node indicated to the user equipment.