Terminal Downlink Allocation for Multi-TRP QCL Collision Control
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Solution Overview
Problem
In next-generation mobile communication systems, the control of channels/signals during inter-cell mobility and multi-TRP scenarios is inadequate, leading to potential throughput degradation and communication quality issues due to collisions and differing quasi-co-location types of channels/signals.
Innovation Solution
A terminal and base station are designed with a control section that judges the allocation of downlink shared channels and reference signals based on cell and group indices, enabling appropriate reception and transmission of channels/signals from the same or different cells/TRPs, using TCI states and QCL assumptions to manage collisions and resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channels/signals from multiple cells/TRPs are transmitted simultaneously, then system capacity and mobility performance are improved, but resource collisions and communication quality degradation occur
Solution Approach 1:
The patent segments the control resource sets into different groups (first group and second group) with different quasi-co-location type assumptions. This segmentation allows channels and signals from different cells/TRPs to be organized into separate groups, preventing resource collisions while maintaining high system capacity. Each group can be independently managed with appropriate QCL assumptions, resolving the contradiction between multi-cell transmission and communication quality.
Solution Approach 2:
The patent applies different quasi-co-location type assumptions to different groups of control resource sets. The first group uses QCL type A assumption while the second group uses QCL type D assumption. This local differentiation allows optimal resource allocation for each group based on their specific characteristics, enabling simultaneous transmission from multiple cells/TRPs while maintaining communication quality through appropriate local resource management.
2Reliability
If priority rules are applied to ensure same QCL type D for colliding channels/signals, then communication quality is maintained, but flexibility in inter-cell mobility and multi-TRP scenarios is reduced
Solution Approach 1:
The patent introduces dynamic group indication through DCI format 2_0 to switch between different groups of control resource sets. This dynamic mechanism allows the system to adaptively change which group (with which QCL assumption) is active based on current mobility and transmission requirements. The dynamic switching capability provides flexibility for inter-cell mobility and multi-TRP scenarios while maintaining communication quality through appropriate QCL assumptions for each group.
Solution Approach 2:
The patent changes the parameter of quasi-co-location type assumption based on the group indication. By switching between QCL type A and QCL type D assumptions through group selection, the system can adapt to different transmission scenarios. This parameter change mechanism enables flexible inter-cell mobility and multi-TRP operation while maintaining communication quality through appropriate QCL assumptions for each scenario.
3Adaptability or versatility
If multiple control resource sets with different QCL assumptions are configured, then adaptability to different transmission scenarios is improved, but system complexity increases
Solution Approach 1:
The patent introduces group indication as an intermediary mechanism to manage multiple control resource sets. Instead of directly managing complex QCL assumptions for each control resource set, the system uses group indication (0 or 1) as a simplified intermediary that selects between pre-configured groups. This intermediary approach reduces terminal complexity by providing a straightforward selection mechanism while maintaining adaptability to different transmission scenarios through the group-based organization.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a control section that judges allocation of a downlink shared channel or a reference signal for the downlink shared channel, based on at least one of a cell index, a control resource set pool index, and a group index configured for a control resource set to which each of the synchronization signal block and the downlink shared channel corresponds; and a reception section that receives at least one of the synchronization signal block and the downlink shared channel.