Beam Indication Information Transmission in 5G PDSCH
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Solution Overview
Problem
In next-generation wireless communication systems, existing solutions face challenges in efficiently managing beam indication related information for user equipment (UE) in a physical downlink shared channel (PDSCH) across multiple component carriers (CCs) and bandwidth parts (BWP), particularly when transmission configuration indications (TCI) are absent or have varying scheduling offsets, leading to difficulties in quasi-co-location (QCL) and beam alignment.
Innovation Solution
The proposed solution defines techniques for PDSCH beam indication in scenarios with multiple CCs/BWPs, including spatial quasi-co-location (QCL) with specific CORESET IDs or TCI states, based on scheduling offsets and the presence or absence of TCI, to ensure accurate beam alignment and data transmission, even when cross-carrier scheduling is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam indication information is transmitted in PDSCH across multiple CCs and BWPs, then beam alignment capability is improved, but system complexity increases
Solution Approach 1:
The patent segments beam indication information into multiple Transmission Configuration Indication (TCI) states, where each TCI state corresponds to a specific beam configuration. This allows the UE to process beam indications for different CCs and BWPs independently through discrete TCI state mappings, reducing the complexity of managing unified beam configurations across multiple carriers and bandwidth parts.
Solution Approach 2:
The patent introduces a new dimension of beam management by implementing cross-carrier beam indication, where beam indication information can be transmitted on one CC while applying to PDSCH receptions on different CCs. This dimensional extension allows centralized beam control while maintaining adaptability across multiple carriers and BWPs.
2Measurement precision
If TCI states are used for beam indication, then beam precision is improved, but information processing overhead increases
Solution Approach 1:
The patent employs preliminary action by pre-configuring multiple TCI states through higher-layer signaling before actual PDSCH reception. The UE receives and stores these TCI states in advance, allowing rapid beam selection during PDSCH reception without real-time computation, thereby reducing processing overhead while maintaining precise beam indication.
Solution Approach 2:
The patent uses DCI (Downlink Control Information) as an intermediary to select and activate specific TCI states from the pre-configured set. Instead of transmitting complete beam configuration information for each PDSCH, the DCI contains a compact TCI state indicator that references the pre-configured states, significantly reducing information overhead while preserving beam precision.
Data Source
AI summary
Technology for user equipment (UE) operable to decode beam indication related information received from a New Radio (NR) base station in a physical downlink shared channel (PDSCH) is disclosed. The UE can decode a transmission configuration indication (TCI) received in a downlink control information (DCI) from the NR base station on a scheduling physical downlink control channel (PDCCH) in a scheduled bandwidth part (BWP) or a scheduled component carrier (CC). The UE can decode a scheduling offset received from the NR base station, wherein the scheduling offset is an offset time for reception of beam indication related information in a physical downlink shared channel (PDSCH). The UE can decode the beam indication related information received from the NR base station in the PDSCH on the scheduled BWP or the scheduled CC at a time period greater than or equal to the scheduling offset relative to the PDCCH transmission.