UL Beam Selection Using Spatial Domain Filters in User Terminals
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Solution Overview
Problem
In future radio communication systems, the determination of uplink beams is not adequately addressed under specific conditions such as when beam correspondence is not supported, spatial relation information is not configured, or downlink control information lacks an SRS resource identification field.
Innovation Solution
The user terminal includes a control section to determine spatial domain filters based on the presence or absence of beam correspondence, spatial relation information, and the type of downlink control information, and a transmitting section to perform UL transmission using these filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE determines UL beams based on standard procedures, then normal UL transmission is achieved, but UL beam selection fails under specific conditions (beam correspondence not supported, spatial relation information not configured, DCI without SRS resource identification field)
Solution Approach 1:
The patent implements dynamic UL beam determination by switching between different determination methods based on the configured mode (first mode using spatial domain filter from DL beam, second mode using SRS resource indicator). This dynamic adaptation allows the system to reliably select UL beams under various conditions including when beam correspondence is not supported or when spatial relation information is not configured.
Solution Approach 2:
The patent changes the parameter used for UL beam determination based on the operating mode. In the first mode, the spatial domain filter is derived from the DL beam parameter. In the second mode, the SRS resource indicator parameter is used instead. This parameter switching enables reliable UL beam selection across different condition scenarios.
2Reliability
If complex UL beam management procedures are implemented to handle all specific conditions, then UL beam selection reliability improves, but system complexity increases
Solution Approach 1:
The patent creates a universal UL beam determination mechanism that handles multiple scenarios (beam correspondence supported/not supported, spatial relation information configured/not configured, DCI with/without SRS resource identification field) through a single unified framework with two determination modes. This multi-functionality eliminates the need for separate complex procedures for each specific condition, reducing overall system complexity while maintaining reliability.
Solution Approach 2:
Instead of configuring separate complex procedures for each specific condition, the patent inverts the approach by using a simple two-mode determination system where the mode itself adapts to the conditions. This inversion simplifies the beam management procedure while maintaining the ability to handle all specific scenarios reliably.
Data Source
AI summary
User terminal according to one aspect of the present disclosure includes: a control section configured to determine a given spatial domain filter used for UL transmission based on at least one of presence or absence of report regarding support for beam correspondence, presence or absence of a configuration of spatial relation information, and a type of downlink control information that schedules UL transmission; and a transmitting section configured to perform UL transmission using the given spatial domain filter for appropriate selection of a UL beam applied to UL transmission.