Uplink Beam Switching via TCI State Mapping in 5G Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In future radio communication systems, dynamically switching uplink beams for UL transmission by a UE is not fully studied, leading to potential deterioration of communication quality.
Innovation Solution
A method is introduced to dynamically control the spatial relation/TCI state for uplink channels based on the transmission configuration indication state, allowing flexible and dynamic switching of UL beams similar to DL beams, using DCI-level signaling for both downlink and uplink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal transmits multiple types of information (buffer status, power headroom, scheduling request) simultaneously using different MAC CE formats, then communication efficiency is improved, but the size of the MAC layer control element increases and message structure complexity increases
Solution Approach 1:
The patent combines multiple MAC CE formats (Buffer Status Report, Power Headroom Report, and Scheduling Request) into a single unified MAC CE structure. This allows the terminal to transmit all three types of information simultaneously in one uplink transmission, improving communication efficiency while the unified structure manages complexity through standardized formatting and bit field organization.
2Measurement precision
If a terminal frequently updates buffer status and power headroom information, then network resource allocation accuracy is improved, but uplink signaling overhead increases
Solution Approach 1:
By merging Buffer Status Reports, Power Headroom Reports, and Scheduling Requests into a single MAC CE, the patent reduces the total number of separate uplink transmissions required. This maintains accurate resource allocation information while reducing signaling overhead compared to sending each report type separately.
3Measurement precision
If the MAC CE includes detailed buffer status for multiple logical channels and power headroom for multiple uplink carriers, then network scheduling accuracy is improved, but the MAC CE size increases
Solution Approach 1:
The patent applies local quality by including detailed buffer status information only for active logical channels and power headroom information only for active uplink carriers. This selective inclusion maintains high scheduling accuracy for relevant channels while reducing MAC CE size by excluding unnecessary information from inactive channels and carriers.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a downlink shared channel scheduled by downlink control information, and a control section that determines, on the basis of at least one of a TCI state (Transmission Configuration Indication state) applied to the downlink shared channel and information notified by the downlink control information, a spatial relation or TCI state applied to an uplink channel corresponding to the downlink control information.