Default QCL for Single DCI-Based Multi-TRP Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring user equipment (UEs) to support default quasi-colocation (QCL) for single downlink control information (DCI)-based multiple transmission reception points (TRPs), which affects power consumption, spectral efficiency, and data rates.
Innovation Solution
The described techniques involve configuring UEs to receive DCI on a physical downlink control channel (PDCCH), decode it, and determine a temporal period associated with the DCI. Based on this, the UE receives the physical downlink shared channel (PDSCH) according to the indicated TCI states, receive beams, PDSCH scheme, or default receive beams, thereby supporting default QCL for single DCI-based multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If default QCL configuration is implemented for single DCI-based multiple TRPs, then spectral efficiency and data rates are improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring default QCL parameters and TCI state mappings before actual data transmission. The network pre-establishes the relationship between DCI indications and multiple TRP configurations, so that during data transmission, the UE can directly apply these pre-configured parameters without complex real-time processing, thus improving spectral efficiency while managing device complexity.
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting and applying different TCI states based on DCI indications. The system changes QCL parameters (such as spatial reception filters and reference signals) according to the indicated TCI state, enabling flexible adaptation to multiple TRPs while maintaining a standardized configuration framework that balances complexity and performance.
2Productivity
If multiple TCI states are indicated in DCI for multiple TRPs, then data rates are improved, but processing time and latency increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and their associated parameters before data transmission. When the DCI indicates a specific TCI state, the UE can quickly switch to the pre-configured parameters without performing complex real-time calculations, thus achieving high data rates with minimal processing time and latency.
Solution Approach 2:
The patent implements dynamics by enabling rapid switching between pre-configured TCI states based on DCI indications. The system dynamically selects the appropriate TCI state for each transmission, allowing flexible adaptation to different TRP configurations and channel conditions while maintaining low latency through pre-prepared parameter sets.
3Reliability
If comprehensive QCL configuration is applied, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by configuring QCL parameters specifically for the indicated TCI state and corresponding TRP, rather than maintaining comprehensive configurations for all possible TRPs continuously. The UE applies QCL settings locally and selectively based on the DCI indication, improving communication reliability for the active TRP while reducing power consumption by avoiding continuous processing of all possible configurations.
Solution Approach 2:
The patent implements self-service by enabling the UE to autonomously select and apply the appropriate QCL configuration based on the TCI state indication in the DCI. The UE uses pre-configured parameters and automatically switches to the correct configuration without requiring continuous network control or complex processing, thereby improving reliability while minimizing power consumption.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as user equipment (UE) may receive a downlink control information (DCI) on a physical downlink control channel (PDCCH). The DCI may include one or more of an indication of a set of transmission configuration indicator (TCI) states related to a physical downlink shared channel (PDSCH), one or more receive beams associated with the set of TCI states, or a physical downlink shared channel (PDSCH) scheme. The UE may decode the DCI and may determine a temporal period associated with the indication of the set of TCI states. The UE may receive, based on the temporal period, the PDSCH according to one or more of the set of TCI states, the one or more receive beams associated with the set of TCI states, the PDSCH scheme, or one or more default receive beams.