UE Downlink Beam Selection Across SBFD and Non-SBFD Resources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face performance loss due to improper beam application for downlink reception in both sub-band full duplex (SBFD) and non-SBFD resources, leading to inefficient resource allocation and increased adjacent channel interference.
Innovation Solution
A method for user equipment (UE) and network devices that involves receiving and transmitting downlink information using a first TCI state with parameters configuring the relationship between downlink reference signals and demodulation reference signal ports, ensuring appropriate beam management for both SBFD and non-SBFD resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same beam is used for DL reception in both SBFD and non-SBFD resources, then device complexity is reduced, but performance loss occurs due to improper beam application
Solution Approach 1:
The patent applies different TCI states for different resource types (SBFD vs non-SBFD). Specifically, the network device configures first TCI states for SBFD resources and second TCI states for non-SBFD resources, allowing each resource type to use the most appropriate beam configuration for its characteristics, thereby optimizing DL reception performance without excessive complexity
Solution Approach 2:
The patent introduces dynamic beam selection based on resource type. The UE determines whether to apply first or second TCI states based on whether the current resource is SBFD or non-SBFD, enabling adaptive beam management that responds to changing resource conditions rather than using a static single beam configuration
2Object-affected harmful factors
If separate antenna panels are used for simultaneous Tx/Rx in multi-panel transmission, then adjacent channel interference is reduced, but device complexity increases
Solution Approach 1:
The patent segments the beam management into separate TCI states for different resource types. By configuring first TCI states for SBFD resources and second TCI states for non-SBFD resources, the patent creates distinct beam configurations that can be applied to different antenna panels or resource sets, thereby reducing adjacent channel interference through proper spatial separation
Solution Approach 2:
The patent introduces TCI states as an intermediary mechanism that mediates between the physical antenna panel configuration and the logical resource allocation. The TCI states provide a layer of abstraction that enables the network to control beam directions and reduce interference without requiring direct manual configuration of antenna panel settings
3Productivity
If DL and UL bands are allocated in the same symbol in SBFD, then resource utilization is improved, but adjacent channel interference increases
Solution Approach 1:
The patent applies different beam configurations (first TCI states vs second TCI states) to different resource types within the same time-frequency grid. For SBFD resources where DL and UL share the same symbol, appropriate first TCI states are applied to optimize beam directions and minimize adjacent channel interference, while maintaining high resource utilization through simultaneous DL/UL allocation
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
A method used by a user equipment (UE), a method used by a network device (NW), and a user equipment (UE) are provided. The method includes: receiving a downlink, DL, information configuration, wherein the DL information configuration is associated with time and frequency domain information for receiving DL information; receiving the DL information for scheduling physical downlink shared channel, PDSCH; and receiving the PDSCH according to the DL information and a first TCI stat. The first TCI state comprises parameters for configuring a relationship between downlink reference signal and at least one demodulation reference signal, DM-RS, port of the PDSCH.