Terminal PDSCH Reception with Dynamic TCI States for MTRP
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Solution Overview
Problem
Existing communication systems in NR (New Radio) face challenges in efficiently managing multiple TCI states for PDSCH-MTRP schemes, leading to suboptimal performance in scenarios requiring enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC).
Innovation Solution
A terminal apparatus and base station apparatus are designed to handle multiple TCI states through PDSCH-MTRP schemes, including SFN, FDM, TDM, and SDM, with DCI indicating specific TCI states for efficient communication, allowing flexible application of TCI states based on DCI fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states are indicated for PDSCH-MTRP schemes, then communication reliability and performance in diverse scenarios (eMBB, mMTC, URLLC) are improved, but device complexity and signal processing requirements increase
Solution Approach 1:
The patent implements dynamic TCI state indication mechanisms where the base station can flexibly indicate one or two TCI states for PDSCH-MTRP schemes based on current communication conditions. The terminal device dynamically processes these indications and applies appropriate TCI states for receiving PDSCH, enabling adaptation to varying channel conditions and service requirements without fixed complexity
Solution Approach 2:
The patent changes the parameter of TCI state indication by introducing a specific field in DCI format that can indicate different TCI state combinations. When the field indicates a first value, one TCI state is applied; when it indicates a second value, two TCI states are applied. This parameter-based control allows the system to adjust between single-T CI and dual-TCI modes, balancing reliability improvement with device complexity management
2Adaptability or versatility
If flexible TCI state application is implemented based on DCI fields, then adaptability to different communication scenarios is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring TCI states and their associations with DCI field values before actual PDSCH reception. The terminal device maintains a mapping between DCI field indications and corresponding TCI state combinations, so that during actual reception, it only needs to perform table lookup and application rather than complex real-time analysis, reducing instantaneous signal processing complexity while maintaining high adaptability
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a specific field in DCI format that mediates between the base station's scheduling decisions and the terminal's TCI state application. This field acts as a compact indicator that carries TCI state information efficiently, reducing the amount of explicit signaling required while enabling flexible adaptation to different communication scenarios
Data Source
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AI summary
A receiver is included which is configured to receive a first PDCCH to which first DCI is mapped, a second PDCCH to which second DCI is mapped, and a PDSCH scheduled by the second DCI, wherein a PDSCH-MTRP scheme is configured to be applied for the PDSCH, the PDSCH-MTRP scheme is some or all of an SFN scheme, an FDM scheme, a TDM scheme, and an SDM scheme, the first DCI indicates a first TCI state and a second TCI state, one or both of the first TCI state and the second TCI state being applied to the PDSCH is determined based on a higher layer parameter, in a case that one of the first TCI state and the second TCI state is applied to the PDSCH, the PDSCH-MTRP scheme is not applied to the PDSCH, and in a case that both of the first TCI state and the second TCI state are applied to the PDSCH, the PDSCH-MTRP scheme is applied to the PDSCH.