Full Duplex UE Transport Block and HARQ Design
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing duplexing modes in full duplex (FD) user equipment (UEs), which affects the quality of downlink reception due to simultaneous uplink and downlink operations.
Innovation Solution
The proposed solution involves determining a transport block (TB) configuration and hybrid automatic repeat request (HARQ) acknowledgment design based on channel state information (CSI) reports from FD UEs, allowing for optimized duplexing mode management and improved communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operation is implemented in UE to enable simultaneous uplink and downlink communication, then communication efficiency and spectral utilization are improved, but downlink reception quality deteriorates due to self-interference from simultaneous uplink transmission
Solution Approach 1:
The patent segments the downlink reception process into multiple stages: initial reception, interference cancellation, and combined decoding. The self-interference from uplink transmission is separated and cancelled out before final downlink signal processing, allowing full duplex operation to proceed while maintaining downlink quality
Solution Approach 2:
The patent converts the harmful self-interference signal into a beneficial component by capturing the uplink transmission signal, processing it through interference cancellation algorithms, and subtracting it from the received downlink signal. This transforms the interference from a detrimental factor into a known quantity that can be removed, enabling simultaneous uplink and downlink operation
2Device complexity
If traditional HARQ acknowledgment design is used in full duplex mode, then device complexity is reduced, but acknowledgment reliability deteriorates due to interference between uplink and downlink signals
Solution Approach 1:
The patent introduces an intermediary interference cancellation process between the uplink transmission and downlink reception. The HARQ acknowledgment signals are processed through this intermediary stage where self-interference is removed, ensuring reliable acknowledgment transmission without requiring complex separate channels or protocols
3Reliability
If separate TB configuration is implemented for HD and FD modes to optimize performance, then downlink reception quality is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements dynamic TB configuration that adapts to the current duplexing mode. The base station and UE maintain a pre-agreed mapping between duplexing modes and TB configurations, allowing automatic adaptation without complex real-time signaling. When switching between HD and FD modes, the system dynamically selects the appropriate TB configuration based on the current mode, optimizing performance while keeping implementation feasible
Data Source
AI summary
Techniques and apparatus for determining a transport block (TB) configuration and hybrid automatic repeat request (HARQ) acknowledgment (ACK)/negative acknowledgment (NACK) configuration for full duplex (FD) UE(s) are described. One technique involves receiving channel state information (CSI) report(s) from a UE operating in FD mode. At least one of a TB configuration or feedback type for a communication slot is determined based on the CSI report(s). The communication slot can include half duplex (HD) symbol(s) and FD symbol(s). An indication of at least one of the TB configuration or the feedback type is signaled to the UE. Another technique involves receiving, from a base station (BS), downlink data transmission(s) across a slot(s). A type of duplexing mode associated with each of the slot(s) is determined. The downlink data transmission(s) are acknowledged, based at least in part on the type of duplexing mode associated with each of the slot(s).