Aperiodic CSI-RS QCL Assumptions for Multi-TRP Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining quasi-co-located assumptions for aperiodic channel state information reference signals in multi-transmission-reception-point operations, particularly when scheduling offsets are below a certain threshold, which can limit network scheduling flexibility and strain UE devices.
Innovation Solution
Implement techniques for determining quasi-co-located assumptions for aperiodic channel state information reference signals, including primary and backup approaches, to enable reliable signal reception and decoding even when scheduling offsets are below the threshold, by using configured quasi-co-location assumptions and beam configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the scheduling offset is reduced to improve network scheduling flexibility, then scheduling flexibility is improved, but signal reception accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring quasi-co-location assumptions and beam configurations before the actual signal reception. When the scheduling offset is below the threshold, the UE uses these pre-configured assumptions to determine the QCL relationship and apply the appropriate beam configuration, enabling accurate signal reception even with reduced scheduling offset. This resolves the contradiction by preparing the necessary configuration information in advance, allowing flexible scheduling without compromising reception accuracy.
2Measurement precision
If complex determination approaches are used to improve signal reception accuracy, then signal reception accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by providing different determination approaches based on the specific operating scenario. For single-DCI mode, one determination approach is used, while for multi-DCI mode, a different approach is applied. The network can configure appropriate quasi-co-location assumptions and beam configurations tailored to each mode, allowing the UE to accurately determine QCL relationships without requiring a single overly complex universal solution. This resolves the contradiction by optimizing the determination complexity for each local scenario.
3Adaptability or versatility
If multiple determination approaches are provided for different modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by enabling the system to adaptively switch between different determination approaches based on the operating mode (single-DCI or multi-DCI). The network dynamically configures appropriate quasi-co-location assumptions and beam configurations according to the selected mode, and the UE dynamically selects the appropriate determination approach based on the configured parameters. This resolves the contradiction by making the system flexible and adaptable without requiring the UE to permanently support all possible approaches simultaneously.
Data Source
AI summary
This disclosure relates to techniques for determining a quasi-co-located assumption for aperiodic channel state information reference signals for multi-transmission-reception-point operation in a wireless communication system. A wireless device may establish wireless links with multiple transmission-reception-points of a cellular network. The wireless device may receive downlink control information. The wireless device may determine a quasi-co-located assumption for aperiodic channel state information reference signals for the downlink control information. Signals received according to the quasi-co-located assumption for aperiodic channel state information reference signals may be buffered by the wireless device if a scheduling offset for the downlink control information is below a scheduling offset threshold.