Full-Duplex Receiver HARQ-ACK Feedback Latency
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Solution Overview
Problem
Current 5G systems with half-duplex base stations face high UL control channel overhead and latency issues due to the need for reserved PUCCH resources, which limits the practicality of rate-less HARQ schemes and degrades reliability in case of collisions.
Innovation Solution
Implementing a full-duplex communication system where the receiver analyzes the received data portion and its redundancy to transmit an ACK signal using the same resource portion, allowing for increased redundancy and efficient resource allocation, and introducing a dynamic starting point for resource scheduling to enable immediate resource reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If half-duplex base stations reserve PUCCH resources for HARQ-ACK transmission, then reliability of feedback is improved, but control channel overhead and latency increase
Solution Approach 1:
The patent transitions from time-domain resource allocation to frequency-domain resource allocation for HARQ-ACK feedback. By assigning specific frequency resources (PUCCH resources) for feedback transmission, the system eliminates time-domain reservations and reduces latency while maintaining reliability through frequency-based separation of control channels.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can flexibly assign PUCCH resources based on current transmission conditions. This dynamic approach allows the system to adapt resource allocation in real-time, reducing overhead by only reserving necessary frequency resources when needed, rather than continuously reserving time slots.
2Reliability
If PUCCH resources are reserved for HARQ-ACK transmission, then feedback reliability is improved, but control channel overhead increases
Solution Approach 1:
The patent applies local quality by assigning specific frequency resources (PUCCH resources) dedicated to HARQ-ACK feedback transmission. This localized frequency allocation ensures that feedback channels have guaranteed resources without requiring extensive reservations across the entire control channel spectrum, thereby reducing overall overhead while maintaining feedback reliability in critical frequency bands.
3Reliability
If rate-less HARQ schemes are implemented with reserved PUCCH resources, then redundancy is increased, but latency and overhead are exacerbated
Solution Approach 1:
The patent resolves the latency issue in rate-less HARQ by moving from time-domain resource reservation to frequency-domain resource allocation. This dimensional shift allows the base station to transmit HARQ-ACK feedback immediately on available frequency resources without waiting for reserved time slots, thereby reducing latency while maintaining the redundancy benefits of rate-less HARQ schemes.
Data Source
AI summary
Communication system including a data transmission controller, at least a transmitter and at least a receiver wherein the transmitter is configured to transmit a first data portion to the receiver by use of a resource portion having a bandwidth and a plurality of time frames in a manner to further increase a redundancy of the first data portion to be transmitted from time frame to time frame of the plurality of time frames, wherein the receiver is configured to analyze the received first data portion and its redundancy to determine a correctly and/or completely and/or sufficiently received first data portion or incorrectly and/or incompletely and/or insufficiently received first data portion and to transmit an ACK signal to the transmitter using the resource portion, when determining the correctly and/or completely and/or sufficiently received first data portion.