Adaptive Feedback Resource Allocation for Subband Full Duplex
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Solution Overview
Problem
Current wireless communication systems, particularly those employing half-duplex V2X systems, do not efficiently utilize the capabilities of full-duplex user equipment (UEs), leading to decreased spectral efficiency, data throughput, and increased system latency due to inefficient feedback resource allocation.
Innovation Solution
The implementation of adaptive feedback methods for sub-band full duplex systems, where full-duplex UEs dynamically assign and adjust feedback resources based on priority and availability, allowing for concurrent transmission and reception of feedback, thereby maximizing the number of feedback transmissions and receptions within a sidelink feedback channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If half-duplex feedback resource allocation is used, then system compatibility is maintained, but spectral efficiency and data throughput decrease
Solution Approach 1:
The patent implements dynamic feedback resource allocation where full-duplex UEs can adaptively select between transmitting and receiving feedback based on channel conditions and traffic requirements. The system dynamically configures feedback resources on a per-UE basis, allowing full-duplex devices to simultaneously transmit data on one subband and receive feedback on another subband, thereby resolving the contradiction between maintaining system compatibility and improving spectral efficiency.
2Device complexity
If default feedback resource mapping is used, then implementation complexity is reduced, but system latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple feedback resource sets and establishing mapping rules before actual communication occurs. The gNB pre-allocates feedback resources and provides mapping indications to UEs in advance, enabling full-duplex UEs to immediately utilize optimized feedback paths without real-time computation delays, thus reducing system latency while maintaining manageable implementation complexity.
3Productivity
If concurrent feedback transmission and reception is enabled, then data throughput increases, but resource allocation complexity increases
Solution Approach 1:
The patent segments the feedback resources into multiple independent sets, each associated with specific subbands or service types. By dividing the feedback channel into separate resource pools, the system enables full-duplex UEs to concurrently transmit and receive feedback on different segments without interference, thereby increasing data throughput while keeping resource allocation complexity manageable through structured organization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The method includes identifying a feedback channel configuration that maps a set of multiple subchannels of a sidelink channel to a set of multiple feedback resources of a feedback channel of the sidelink channel, receiving control signaling scheduling the full duplex UE to transmit or receive a first sidelink message in a first subchannel of the set of multiple subchannels, assigning a first feedback resource of the set of multiple feedback resources for transmission or reception of feedback for the first sidelink message that differs from a default resource identified by the feedback channel configuration, and communicating feedback data for the first sidelink message in the first feedback resource of the feedback channel based on the assigning.