Multi-TRP PDCCH Repetition With Explicit Candidate Linkage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MIMO transmission schemes for PDCCH in multi-TRP systems face challenges in efficiently associating and prioritizing PDCCH candidates with multiple TCI states, leading to incorrect HARQ-ACK codebook payload sizes and suboptimal reception strategies.
Innovation Solution
The proposed solution involves enhancing PDCCH transmission by introducing methods for explicit and implicit linkage of PDCCH candidates with multiple TCI states, prioritizing CORESET monitoring, and optimizing HARQ-ACK codebook construction to ensure accurate payload size determination and efficient reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCH candidates with multiple TCI states are transmitted in multi-TRP systems, then transmission reliability is improved, but correct association and prioritization of PDCCH candidates becomes complex
Solution Approach 1:
The patent segments PDCCH candidates into different groups based on TCI state associations. Each PDCCH candidate is associated with specific TCI states, and the UE is configured to monitor candidates in a segmented manner according to their TCI state groupings. This segmentation simplifies the association process by organizing multiple candidates with multiple TCI states into manageable segments rather than treating them as a single complex set.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the UE with specific monitoring rules and prioritization schemes for PDCCH candidates before transmission occurs. The network configures the UE with TCI state associations, candidate prioritization rules, and monitoring parameters in advance through RRC signaling. This preliminary configuration enables the UE to correctly associate and prioritize PDCCH candidates without real-time complex decision-making during reception.
2Area of stationary object
If PDCCH candidates are monitored without proper prioritization, then reception coverage is increased, but HARQ-ACK codebook payload size becomes incorrect
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors UE reception status and adjusts PDCCH candidate prioritization configurations accordingly. The UE provides feedback on successfully decoded PDCCH candidates and their associated TCI states, enabling the network to refine prioritization rules and ensure correct HARQ-ACK codebook payload size calculation. This feedback loop ensures both wide reception coverage and precise payload size determination.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting PDCCH monitoring parameters, TCI state associations, and candidate prioritization levels based on channel conditions and traffic requirements. The network can modify monitoring periodicity, aggregation levels, and TCI state mappings to optimize both reception coverage and HARQ-ACK codebook accuracy for different service scenarios.
3Reliability
If all PDCCH candidates are monitored equally, then detection probability increases, but processing efficiency decreases
Solution Approach 1:
The patent applies local quality by assigning different monitoring priorities and processing qualities to different PDCCH candidate groups based on their TCI state associations and service requirements. High-priority candidates with critical TCI states receive more robust processing and higher detection thresholds, while lower-priority candidates use streamlined processing. This localized quality differentiation maintains high detection probability for critical transmissions while improving overall processing efficiency.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A method and a user equipment (UE) are provided for explicitly linking repeated physical downlink control channels (PDCCHs). The UE receives the repeated PDCCHs from a network. Each of the repeated PDCCHs include downlink control information (DCI) that schedules reception of a same physical downlink shared channel (PDSCH) at the UE. The UE links the repeated PDCCHs having common PDCCH candidate numbers across search space (SS) sets of a control resource set (CORESET). The repeated PDCCHs are received in accordance with the UE and the network communicating using a multi-transmission and reception point (TRP) repetition scheme or a multi-TRP multi-chance scheme.