Multi-TRP Downlink Reception with CORESET-Based TCI Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in defining the QCL assumption for PDSCH reception when the TCI is not present in DCI, particularly in scenarios involving multiple TRPs and different PDSCH transmission schemes.
Innovation Solution
The UE determines the DCI transmission scheme and selects appropriate TCIs for PDSCH reception from candidate TCIs configured for CORESETs when TCI is not indicated in DCI, using SFN, non-SFN, or hybrid schemes, and applies TCI states configured for CORESETs with scheduling PDCCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TCI is not present in DCI for PDSCH reception, then the downlink control signaling is simplified, but the QCL assumption for PDSCH reception becomes ambiguous and difficult to determine
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate TCIs in the CORESET before DCI reception. When TCI is not present in DCI, the UE can directly use these pre-configured candidate TCIs to determine QCL assumptions, eliminating the need for complex post-reception determination procedures.
Solution Approach 2:
The patent introduces candidate TCIs as an intermediary between the simplified DCI (without TCI) and the PDSCH reception requiring QCL assumptions. These candidate TCIs serve as a bridge that carries the necessary QCL information from the CORESET configuration to the PDSCH reception process.
2Adaptability or versatility
If multiple TRPs are used with different transmission schemes (SFN, non-SFN, hybrid), then the system flexibility and coverage are improved, but the TCI selection process for PDSCH reception becomes more complex
Solution Approach 1:
The patent applies local quality by associating different candidate TCI sets with different CORESETs and their respective TRPs. Each CORESET maintains its own localized TCI candidates configured through higher layer signaling, allowing the UE to select appropriate TCIs based on which specific CORESET scheduled the PDSCH, thereby simplifying the selection process while supporting multiple TRP schemes.
Solution Approach 2:
The patent makes the candidate TCI mechanism universal by designing a unified approach that works across all three transmission schemes (SFN, non-SFN, and hybrid). The same candidate TCI selection mechanism from CORESET configurations applies regardless of which transmission scheme is used, eliminating the need for separate selection procedures for each scheme.
3Reliability
If the UE selects TCI from candidate TCIs configured for CORESETs when TCI is not in DCI, then reliable PDSCH reception is achieved, but the processing time and complexity increase
Solution Approach 1:
The patent reduces processing time by performing TCI configuration in advance through higher layer signaling during CORESET setup. The candidate TCIs are prepared beforehand and stored in the UE, so when PDSCH reception occurs without TCI in DCI, the UE can immediately select from the pre-configured candidates without real-time computation or additional signaling delays.
Data Source
AI summary
Embodiments of the present disclosure relate to downlink data reception operation. According to embodiments of the present disclosure, a baseband processor of a user equipment (UE) is configured to perform operations comprising receiving Downlink Control Information (DCI) through more than one beams TRP, determining a DCI transmission scheme for the received DCI, wherein the DCI transmission scheme is configured by an upper layer signaling, and wherein the DCI transmission scheme is one of a Single Frequency Network (SFN) scheme, a non-SFN scheme, and a hybrid scheme, wherein the DCI is transmitted using both SFN scheme and non-SFH scheme in the hybrid scheme, determining whether the received DCI indicates a Transmission Configuration Indicator (TCI) for PDSCH reception from the at least one TRP or not.