PDSCH Beam Selection Using TCI States for SBFD Resources
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Solution Overview
Problem
Existing wireless communication systems face performance loss due to improper beam application in both sub-band full duplex (SBFD) and non-SBFD resources, leading to inefficient downlink and uplink operations.
Innovation Solution
A method for user equipment (UE) and network devices to utilize time and frequency domain information for configuring downlink information, including a first TCI state to manage the relationship between downlink reference signals and demodulation reference signal ports, optimizing beam management across different resource types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same beam is used for downlink reception in both SBFD and non-SBFD resources, then beam management is simplified, but communication performance deteriorates due to improper beam application
Solution Approach 1:
The patent segments the beam management process by introducing separate TCI states for SBFD and non-SBFD resources. The network device configures first TCI states for SBFD downlink reception and second TCI states for non-SBFD downlink reception, allowing independent beam selection and optimization for each resource type rather than using a unified beam configuration.
Solution Approach 2:
The patent applies local quality by enabling different beam configurations for different resource types. The UE applies first TCI states (with first beam parameters) specifically for SBFD downlink reception and second TCI states (with second beam parameters) specifically for non-SBFD downlink reception, optimizing beam quality locally for each scenario rather than using a single global beam.
2Reliability
If separate TCI states are configured for SBFD and non-SBFD resources, then beam application is optimized, but system complexity increases
Solution Approach 1:
The patent applies universality by enabling the network device to configure both first TCI states and second TCI states through a unified RRC configuration mechanism. The same configuration framework handles both SBFD and non-SBFD resource types, and the UE uses a consistent decision process (based on resource type detection) to select appropriate TCI states, reducing operational complexity despite the expanded configuration space.
3Productivity
If proper beam selection is made for each resource type, then communication efficiency improves, but processing time increases
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure both first TCI states and second TCI states before actual downlink reception. The UE receives and stores these pre-configured TCI states, so during actual communication it only needs to detect the resource type and select the pre-prepared appropriate TCI state, avoiding real-time beam selection computation.
Data Source
AI summary
A method used by a user equipment, a method used by a network device, and a user equipment 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.