Multi-PDSCH Reception Using Dynamic TCI States for SBFD Symbols
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Solution Overview
Problem
In wireless communication systems, particularly in 5G, UEs face challenges in decoding multiple downlink shared channels (PDSCHs) due to varying antenna configurations between Subband-Fully-Duplex (SBFD) and non-SBFD symbols, leading to inefficiencies in reception.
Innovation Solution
A method for user equipment (UE) to receive multiple PDSCHs by using quasi co-location (QCL) assumptions based on downlink control information (DCI), with separate QCL assumptions for different symbol types, and employing distinct antenna settings for SBFD and non-SBFD symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BS uses different antenna configurations for SBFD and non-SBFD symbols, then the BS can manage self-interference effectively, but the UE fails to properly decode downlink transmissions due to fixed spatial reception configuration
Solution Approach 1:
The patent implements dynamic spatial reception configuration at the UE by introducing a TCI field in DCI that indicates different TCI states for different symbol types (SBFD vs non-SBFD). This allows the UE to dynamically switch between different antenna configurations and spatial reception parameters matching the BS's varying transmission patterns, resolving the contradiction between maintaining fixed configuration simplicity and adapting to dynamic transmission requirements.
Solution Approach 2:
The patent changes the spatial reception parameters (TCI states, quasi-co-location assumptions) based on the symbol type. Different TCI states are configured for SBFD symbols versus non-SBFD symbols, allowing the UE to adjust its reception parameters dynamically. This parameter adaptation enables proper decoding despite the BS using different antenna configurations for different symbol types.
2Ease of operation
If the UE applies a fixed spatial reception configuration, then the UE operation is simplified, but the UE cannot align with the BS's varying transmission patterns across different symbol types
Solution Approach 1:
The patent uses preliminary action by pre-configuring multiple TCI states in the TCI state table before actual transmission. The BS selects appropriate pre-configured TCI states for different symbol types and indicates them via DCI. This allows the UE to have ready-made spatial reception configurations prepared in advance, maintaining operational simplicity while ensuring reliability through proper alignment with BS transmission patterns.
Solution Approach 2:
The patent introduces TCI states as an intermediary layer between the BS's antenna configurations and the UE's spatial reception. The TCI states act as mediators that translate the BS's varying transmission patterns into UE-applicable reception parameters. This intermediary mechanism maintains UE operational simplicity while enabling reliable adaptation to different symbol types through the DCI-indicated TCI states.
3Productivity
If the BS transmits and receives simultaneously in different subbands using SBFD symbols, then spectral efficiency is improved, but complex interference control requiring distinct antenna configurations is required
Solution Approach 1:
The patent segments the spatial reception configuration into different TCI states corresponding to different symbol types (SBFD and non-SBFD). By dividing the reception configuration into distinct segments for different transmission modes, the UE can handle the complexity of simultaneous transmission and reception by applying appropriate segmented configurations rather than requiring a single complex unified configuration.
Data Source
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AI summary
A method of multiple physical downlink shared channels, multi-PDSCHs, reception and a user equipment (620) are provided. The method includes: receiving a downlink control information, DCI, from a network, wherein the DCI indicates a reception of multi-PDSCHs.