Dynamic CORESET QCL and TCI for Flexible NR Scheduling
Solution Overview
Problem
Existing wireless communication technologies, particularly in NR and LTE, face challenges in efficiently determining quasi-co-location (QCL) assumptions for control resource sets (CORESETS), which affects scheduling flexibility and increases latency due to sparse control channel monitoring.
Innovation Solution
The proposed solution involves configuring transmission configuration indicator (TCI) states for dynamic CORESETS, allowing dynamic indication of QCL assumptions through DCI, and leveraging existing QCL/TCI state determination mechanisms to enhance scheduling flexibility and reduce latency by dynamically allocating control channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sparse control channel monitoring is used, then power consumption is reduced, but scheduling flexibility is degraded and latency increases
Solution Approach 1:
The patent applies dynamics by enabling dynamic switching between sparse and dense control channel monitoring configurations. The UE can be configured with multiple CORESETs with different monitoring densities and switch between them based on scheduling needs, allowing the system to adapt between power-saving mode and flexible scheduling mode as required
2Use of energy by moving object
If sparse control channel monitoring is used, then power consumption is reduced, but latency increases
Solution Approach 1:
The system dynamically adjusts control channel monitoring density based on traffic conditions and latency requirements. When low latency is needed, the UE can be configured to monitor denser CORESETs; when power saving is prioritized, sparser monitoring is used. This dynamic adaptation resolves the contradiction between power consumption and latency
Solution Approach 2:
The patent employs preliminary action by pre-configuring multiple CORESETs with different monitoring densities and QCL assumptions before actual scheduling occurs. The gNB can quickly switch between pre-configured CORESETs to meet changing latency requirements without requiring time-consuming reconfiguration, thus reducing latency while maintaining power-saving capabilities
3Adaptability or versatility
If dynamic CORESET allocation is implemented, then scheduling flexibility is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a unified framework where a single DCI format can schedule both PDSCH and dynamically allocate CORESET resources. The same TCI state mechanisms used for PDSCH beam management are also applied to PDCCH/CORESET, creating a multi-functional system that reduces overall complexity despite the enhanced scheduling flexibility
Solution Approach 2:
The system uses copying by reusing the TCI state configuration and QCL assumption mechanisms already established for PDSCH and applying them to PDCCH/CORESET. Instead of creating entirely new complexity for dynamic CORESET allocation, the patent copies and adapts existing TCI state frameworks, thereby improving scheduling flexibility while minimizing the increase in system complexity
Data Source
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AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for determining quasi co-location (QCL) and/or transmission configuration information (TCI) state assumption information for a dynamic control resource set (CORESET). An example method by a user equipment (UE) generally includes receiving a first physical downlink control channel (PDCCH) in a control channel monitoring occasion, the first PDCCH indicating at least one dynamic CORESET; and receiving a second PDCCH within the dynamic CORESET, wherein the second PDCCH is received in accordance with at least one QCL assumption for the at least one dynamic CORESET.