HARQ-ACK Codebook Switching for SBFD PDSCH Interference
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Solution Overview
Problem
In 5G communication systems, the increased interference and reduced resource blocks in Subband-Fully-Duplex (SBFD) symbols lead to higher error rates for physical downlink shared channels (PDSCH), complicating hybrid automatic repeat request (HARQ) feedback due to unpredictable interference and differing antenna configurations.
Innovation Solution
A method for HARQ feedback in user equipment (UE) involving configurations for symbol types, binary AND operations, and codebook types to manage interference and resource allocation, including type-1 and type-2 HARQ-ACK codebooks, to optimize HARQ feedback across different symbol types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses Subband-Fully-Duplex (SBFD) symbols for simultaneous transmission and reception, then resource utilization is improved, but interference increases and error rate worsens
Solution Approach 1:
The patent segments the HARQ-ACK feedback by creating separate codebooks for SBFD and non-SBFD symbols. Type-1 codebook handles SBFD symbols while type-2 codebook handles non-SBFD symbols, allowing independent optimization and mitigation of interference-specific errors in each segment
Solution Approach 2:
The patent applies different HARQ-ACK codebook types and configurations locally to different symbol types. SBFD symbols use type-1 codebook with specific interference mitigation, while non-SBFD symbols use type-2 codebook, allowing tailored error handling for each local condition
2Object-affected harmful factors
If the base station switches between transmission and reception in non-SBFD symbols, then interference is reduced, but antenna configuration complexity increases
Solution Approach 1:
The patent implements dynamic HARQ-ACK codebook selection based on the symbol type detected in each transmission. The system adapts between type-1 and type-2 codebooks depending on whether the current symbol is SBFD or non-SBFD, allowing flexible response to changing interference conditions without fixed complex configurations
3Reliability
If more resource blocks are allocated in non-SBFD symbols, then coding rate is improved, but resource utilization in SBFD symbols deteriorates
Solution Approach 1:
The patent segments resource allocation and HARQ-ACK feedback into separate codebooks for different symbol types. This allows non-SBFD symbols to use more resource blocks with type-2 codebook for better coding rate, while SBFD symbols use type-1 codebook to maintain resource utilization despite fewer resource blocks
Data Source
AI summary
A method of hybrid automatic repeat request (HARQ) feedback and a user equipment are provided. The method includes: receiving a first configuration from a network, wherein the first configuration indicates a reception behavior; receiving a second configuration from the network, wherein the second configuration indicates a multiple physical downlink shared channels (multi-PDSCHs) reception; receiving a third configuration from the network, wherein the third configuration indicates a HARQ acknowledgment (ACK) codebook type; and transmitting a HARQ feedback according to the first configuration, the second configuration, and the third configuration.