Multi-Cell Default Beam Selection With Single DCI Scheduling
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Solution Overview
Problem
Conventional systems require multiple DCI transmissions for scheduling operations across multiple cells, leading to significant signaling overhead, which is inefficient and consumes network resources.
Innovation Solution
The method enables the determination of default beams for multiple PDSCHs associated with different cells using a single DCI by employing enhanced CORESET configurations, TCI state mappings, and MAC CE activations to reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple DCI transmissions are used for scheduling operations across multiple cells, then scheduling coverage and reliability are improved, but signaling overhead increases and network resources are consumed
Solution Approach 1:
The patent combines multiple DCI scheduling operations into a single DCI transmission that can schedule multiple PDSCHs across multiple cells simultaneously. This merging approach reduces the number of separate DCI messages from multiple transmissions to one consolidated transmission, thereby reducing signaling overhead while maintaining scheduling coverage and reliability across the multi-cell scenario.
Solution Approach 2:
The patent creates a universal DCI structure that can function across multiple cells and schedule multiple PDSCHs simultaneously. This multi-functional DCI design allows a single transmission to perform what previously required multiple cell-specific DCI transmissions, reducing overall signaling overhead while maintaining the scheduling capability across multiple cells.
2Measurement precision
If multiple DCI transmissions are used for multi-cell scheduling, then scheduling accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent merges multiple scheduling decisions into a single DCI transmission containing multiple PDSCH scheduling assignments. This consolidation reduces the number of separate processing operations the UE must perform, as it receives one unified DCI message rather than multiple separate DCI transmissions, thereby reducing processing complexity while maintaining scheduling accuracy through the unified structure.
3Measurement precision
If default beam selection is performed for each PDSCH in multi-cell scheduling, then beam accuracy is improved, but determination complexity increases
Solution Approach 1:
The patent performs preliminary beam determination by selecting a default beam for each cell in advance, before the actual PDSCH reception. The default beam is determined based on pre-configured TCI states associated with each cell, allowing the UE to have beam information ready beforehand. This preliminary action simplifies the real-time processing complexity while maintaining beam accuracy through pre-established TCI state configurations.
Solution Approach 2:
The patent changes the beam determination approach from dynamic per-PDSCH selection to using pre-configured default beams identified by TCI state parameters. By utilizing the TCI state parameters that are already configured for each cell, the system maintains beam accuracy without requiring complex real-time beam selection, thereby reducing determination complexity.
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.