Multi-Cell PDSCH Beam Selection With Single-DCI Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in multi-cell scheduling due to the need for multiple DCI transmissions, leading to significant signaling overhead, especially when scheduling multiple cells, which hinders network resource utilization.
Innovation Solution
The implementation of default beam determination and enhanced TCI state configuration for multiple cells using a single DCI, allowing for efficient multi-cell scheduling by determining default beams and configuring TCI states for multiple PDSCHs associated with different cells through various methods, including enhanced CORESET configurations and TCI-to-Cell mapping tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple DCI transmissions are used to schedule multiple cells, then each cell can be scheduled independently, but signaling overhead increases significantly
Solution Approach 1:
The patent merges multiple DCI transmissions into a single DCI that schedules multiple cells simultaneously. The DCI includes a TCI field that indicates TCI states for multiple cells, and a resource allocation field that allocates resources across multiple cells, thereby reducing signaling overhead while maintaining scheduling capability for multiple cells.
Solution Approach 2:
The single DCI is designed to perform multiple functions: it schedules multiple cells, indicates TCI states for multiple cells, and allocates resources across multiple cells. This multi-functional DCI structure eliminates the need for separate DCI transmissions for each cell, directly addressing the signaling overhead problem.
2Loss of information
If a single DCI is used to schedule multiple cells, then signaling overhead is reduced, but the complexity of determining default beams for each cell increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring TCI states and their associations with cells through RRC signaling before the actual scheduling. The network pre-establishes the mapping between TCI states and cells, so that during scheduling, the UE only needs to interpret the TCI field in the DCI without performing complex real-time beam determination calculations.
Solution Approach 2:
The patent introduces TCI states as an intermediary mechanism between the DCI and the actual beam configuration for each cell. The TCI field in the DCI indirectly specifies the beam configuration for multiple cells by referencing pre-configured TCI states, thereby simplifying the UE's processing complexity while maintaining the benefits of single-DCI multi-cell scheduling.
3Productivity
If TCI states are configured for multiple cells in a single DCI, then resource allocation is optimized, but the requirement for enhanced CORESET configurations increases system complexity
Solution Approach 1:
The patent segments the TCI state configuration into separate entities that can be independently managed. Each TCI state is configured with specific QCL parameters for different cells, allowing the system to maintain flexibility and modularity. This segmentation enables the UE to process and apply TCI states for different cells independently, reducing the overall system complexity while achieving efficient multi-cell resource allocation.
Data Source
AI summary
Methods, systems, devices, and computer programs for determining a default beam for each of a plurality of cells. In one aspect, the method can include receiving, by a UE, multiple PDSCHs that are each associated with a different cell and scheduled by a single DCI, determining, by the UE, that the UE is in an operating state that triggers default beam selection for the multiple PDSCHs associated with multiple cells scheduled by single DCI, and determining, by the UE, a default beam for each of the multiple PDSCHs associated with one of the different cells.