Terminal Beam Timing for Multi-Channel QCL State Application
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Solution Overview
Problem
In future radio communication systems, the information related to quasi-co-location (QCL) is often indefinite, leading to potential communication quality reduction and throughput reduction.
Innovation Solution
A terminal and base station are designed to determine TCI states for multiple types of channels by applying a common beam after a specific time has passed from the end of an uplink channel transmission and reception of downlink control information, ensuring accurate QCL determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TCI state is applied immediately to multiple types of channels, then communication efficiency is improved, but QCL information accuracy deteriorates due to indefinite timing
Solution Approach 1:
The patent applies preliminary action by establishing a predetermined timing relationship before the TCI state application. The terminal determines that the TCI state should be applied after a specific time has passed from the end of uplink channel transmission or from receiving downlink control information. This preliminary timing setup ensures that the TCI state is applied at the correct moment, resolving the contradiction between immediate application (efficiency) and accurate timing (precision).
Solution Approach 2:
The patent changes the timing parameter from immediate application to delayed application by a specific duration. By introducing a time offset parameter (specific time from uplink channel end or downlink control information reception), the system transforms the TCI state application timing from indefinite to precisely controlled, thereby improving QCL information accuracy while maintaining communication efficiency through standardized timing rules.
2Device complexity
If TCI state application timing is determined without specific reference points, then system complexity is reduced, but communication quality deteriorates
Solution Approach 1:
The terminal performs self-service by autonomously determining the TCI state application timing based on its own transmission or reception events. Using internally available reference points (end of uplink channel transmission or reception of downlink control information), the terminal independently calculates the correct application time without requiring complex external coordination, thus maintaining low system complexity while ensuring reliable communication quality.
Solution Approach 2:
The system uses feedback from actual transmission and reception events as the basis for TCI state application timing. The terminal monitors its own uplink channel transmission completion or downlink control information reception, and uses these feedback events as reference points to determine when to apply the TCI state. This event-driven feedback mechanism ensures communication quality without adding significant system complexity.
3Speed
If TCI state is applied before uplink channel operation completes, then processing speed is improved, but information accuracy deteriorates
Solution Approach 1:
The patent prepares the TCI state in advance but delays its actual application until the predetermined timing condition is met. The terminal determines the TCI state early (improving processing speed) but applies it only after the specific time has passed from uplink channel end or downlink control information reception (ensuring QCL determination accuracy). This separates state determination from state application, resolving the speed-precision contradiction.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives first downlink control information indicating a transmission configuration indication (TCI) state applicable to multiple types of channels, and a control section that applies the TCI state to the multiple types of channels after timing at which specific time passes from an end of operation for any one of transmission of an uplink channel based on the first downlink control information and reception of second downlink control information after the first downlink control information. According to one aspect of the present disclosure, it is possible to appropriately determine information related to QCL.