Dynamic PDCCH Skipping for XR Delay Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in extended reality (XR), the conflict between PDCCH skipping and retransmission operations leads to delays due to the UE's inability to monitor scheduling DCI during PDCCH skipping periods, which can exceed delay deadlines for delay-sensitive video data.
Innovation Solution
A dynamic PDCCH skipping configuration allows the UE to monitor for scheduling DCI that schedules retransmissions during PDCCH skipping periods, enabling flexible PDCCH monitoring based on delay deadlines and HARQ/DRX timers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE performs PDCCH skipping to reduce power consumption and processing overhead, then energy efficiency is improved, but the UE cannot monitor scheduling DCI during PDCCH skipping periods causing delays in receiving retransmissions
Solution Approach 1:
The patent implements dynamic PDCCH skipping where the UE can adaptively switch between PDCCH monitoring and skipping modes based on whether retransmission data is expected. The UE determines whether to monitor PDCCH during skipping periods by checking if the retransmission time coincides with the skipping period, and if so, suspends skipping to monitor for the retransmission DCI. This dynamic adaptation resolves the contradiction by enabling power saving during non-retransmission periods while ensuring timely reception of retransmissions.
2Reliability
If the UE continuously monitors PDCCH to ensure timely reception of scheduling DCI for retransmissions, then delay requirements are met, but power consumption and processing overhead increase
Solution Approach 1:
The patent changes the PDCCH monitoring parameter dynamically based on the retransmission timing. Instead of continuous monitoring, the UE adjusts its monitoring behavior by comparing the retransmission time with the PDCCH skipping period configuration. When retransmission is expected during a skipping period, the UE modifies its monitoring parameters to activate PDCCH reception, otherwise it maintains skipping mode. This parameter adaptation ensures reliable retransmission reception while minimizing power consumption.
3Use of energy by moving object
If the network configures long PDCCH skipping periods to maximize power savings, then energy efficiency is improved, but the flexibility to handle delay-sensitive retransmissions is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors for retransmission timing information from the network and uses this feedback to adjust its PDCCH skipping behavior. The network provides retransmission timing indicators, and the UE uses this feedback to determine whether to suspend PDCCH skipping and monitor for DCI. This feedback loop enables the system to maintain long skipping periods for power savings while adapting flexibly when retransmissions are required, resolving the contradiction between energy efficiency and adaptability.
Data Source
AI summary
Method and apparatus for dynamic PDCCH skipping for XR. The apparatus receives a PDCCH skipping configuration. The apparatus receives an indication to perform a PDCCH skipping procedure based on the PDCCH skipping configuration. The apparatus determines to monitor a DCI during the PDCCH skipping procedure based on the PDCCH skipping configuration. The apparatus may transmit a UE capability report indicating that the UE supports a dynamic behavior of monitoring for the DCI that schedules a retransmission during a PDCCH skipping period. The apparatus may monitor a non-scheduling DCI based PDCCH monitoring adaptation indication. The apparatus may perform a dynamic behavior of monitoring for the DCI that schedules a retransmission during a PDCCH skipping period.