Cross-Carrier Scheduling with sSCell-to-PCell Failover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing cross-carrier scheduling, particularly when a special secondary cell (sSCell) fails, leading to inefficiencies in distributing control channel elements (CCEs) across primary and secondary cells.
Innovation Solution
Implementing methods and apparatuses for transmitting and receiving recommendations and configurations related to cross-carrier scheduling, including distributing CCEs across sSCell and PCell, based on sSCell failure, to optimize scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier scheduling is implemented using sSCell, then scheduling flexibility and resource utilization are improved, but system reliability deteriorates when sSCell fails
Solution Approach 1:
The network entity pre-configures multiple PCells (primary cells) before sSCell failure occurs. When sSCell failure is detected, the UE can immediately switch to using the pre-configured PCell for scheduling, avoiding service interruption. This preliminary preparation resolves the contradiction by ensuring scheduling reliability is maintained while preserving the scheduling efficiency benefits of cross-carrier scheduling during normal operation.
Solution Approach 2:
The system establishes backup PCell configurations in advance as a cushion against sSCell failure. This backup arrangement ensures that when the sSCell fails, the scheduling function can seamlessly transition to the PCell, preventing system collapse. The beforehand cushioning approach maintains both scheduling efficiency under normal conditions and scheduling reliability during failure scenarios.
2Productivity
If CCE distribution is concentrated on sSCell, then resource allocation efficiency is improved, but vulnerability to sSCell failure increases
Solution Approach 1:
The patent implements differentiated CCE distribution strategies for different cells: under normal conditions, CCEs are concentrated on sSCell to maximize resource allocation efficiency; upon sSCell failure detection, the system locally adapts by redistributing CCEs to the PCell. This local quality adjustment resolves the contradiction by optimizing for efficiency when sSCell is healthy while providing failure resistance when needed.
Solution Approach 2:
The CCE distribution configuration is made dynamic rather than static. The system continuously monitors sSCell health status and automatically adjusts CCE allocation between sSCell and PCell based on real-time conditions. This dynamic adaptation allows the system to achieve high resource allocation efficiency during normal operation while automatically switching to a failure-resistant configuration when sSCell fails.
3Measurement precision
If UE monitors sSCell for scheduling, then scheduling precision is improved, but system complexity increases when handling sSCell failures
Solution Approach 1:
The UE is equipped with autonomous failure detection and response capabilities. When sSCell failure occurs, the UE automatically detects the failure condition and switches to monitoring the PCell for scheduling information without requiring complex network intervention. This self-service approach maintains scheduling precision while reducing the complexity of failure handling by empowering the UE to manage its own scheduling monitoring.
Solution Approach 2:
The system implements a feedback mechanism where the UE reports sSCell status to the network entity, which then provides appropriate configuration updates. This feedback loop enables the system to maintain high scheduling precision by continuously adapting to sSCell health status while managing complexity through automated feedback-driven reconfiguration rather than complex manual intervention protocols.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a recommendation associated with a special secondary cell (sSCell) or a primary cell (PCell) used for cross-carrier scheduling, based at least in part on the sSCell failing. The UE may receive a configuration for the cross-carrier scheduling that is associated with the recommendation. Numerous other aspects are described.