Wireless Signal Reception Using Multiple Search Space Sets
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception, particularly in managing multiple transmission and reception points (TRPs) and beams for multimedia multicast and broadcast services, leading to challenges in determining the optimal beams for multiple users in idle or inactive modes.
Innovation Solution
The proposed solution involves configuring multiple search space sets and transmission configuration indices (TCIs) for user equipment (UE) to monitor and select the best beams and TRPs based on synchronization signal block measurements, allowing for efficient reception of transport blocks in both initial and retransmission scenarios, even if associated with different TRPs or beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple search space sets and TCI values are configured for beam management, then signal reception quality is improved, but device complexity increases
Solution Approach 1:
The patent divides the beam management process into multiple search space sets (first search space set, second search space set) with different TCI values. Each search space set is associated with specific TRPs or beams, allowing the UE to monitor and evaluate multiple beams separately. This segmentation enables precise beam selection while maintaining manageable complexity through structured organization of monitoring resources.
Solution Approach 2:
The patent implements dynamic beam selection where the UE can adaptively choose between different search space sets and TCI values based on current channel conditions. The UE monitors PDCCH candidates in multiple search space sets and can dynamically switch between beams/TRPs associated with different TCI values, enabling real-time optimization of signal reception quality without requiring complex static configurations.
2Reliability
If multiple TRPs and beams are monitored for multicast services, then reliability is improved, but processing time increases
Solution Approach 1:
The patent configures multiple search space sets and associates them with different TCI values in advance before actual data transmission. The UE is pre-configured with the relationships between search space sets, TCI values, and corresponding TRPs/beams. This preliminary configuration allows the UE to quickly switch between beams during retransmission scenarios without requiring complex real-time decision-making, thus maintaining high reliability while minimizing processing time.
Solution Approach 2:
The patent utilizes TCI (Transmission Configuration Indication) values as parameters to efficiently switch between different beams and TRPs. By changing the TCI value parameter, the UE can rapidly switch between pre-configured search space sets and associated beams, enabling fast adaptation to channel conditions and efficient handling of retransmissions without significant processing delays.
Data Source
AI summary
According to an embodiment of the present invention a user equipment (UE) may receive, in a first search space set, first downlink control information (DCI) that schedules a first physical downlink control channel (PDSCH) based on a first transmission configuration index (TCI) value and receive, in a second search space set of the plurality of search space sets, second DCI that schedules a second PDSCH based on a second TCI value. The UE may determine that a transport block (TB) in the second PDSCH is re-transmission of a TB in the first PDSCH, based on that the first DCI and the second DCI indicates a same hybrid automatic repeat request (HARQ) process identifier (ID), and the first DCI and the second DCI indicates a same new data indicator (NDI) value, even if the first TCI value associated with the first PDSCH is different from the second TCI value associated with the second PDSCH.