Early ARQ Feedback for URLLC Latency Reduction
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Solution Overview
Problem
Current wireless communications systems, particularly 4G and 5G networks, face challenges in providing ultra-reliable low latency communications (URLLC) due to inefficiencies in data packet transmission and reception, leading to increased latency and resource wastage, especially in scenarios with varying radio communications conditions and mobile devices.
Innovation Solution
A communications device equipped with receiver and transmitter circuitry that utilizes an automatic repeat request (ARQ) protocol, where a quality measure is evaluated to generate early feedback signals, allowing for early termination of data packet transmission and reducing resource usage by combining information from repeatedly transmitted OFDM symbols to determine successful decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If early feedback indication is transmitted before complete decoding, then transmission time is reduced and latency is lowered, but decoding reliability may be compromised
Solution Approach 1:
The patent applies preliminary action by transmitting feedback indication before the complete decoding process is finished. The network device sends the feedback indication message to the terminal device based on partial decoding results or quality measures obtained during the decoding process, allowing early termination of transmission and reducing latency while maintaining acceptable reliability through subsequent complete decoding verification.
2Reliability
If data packets are transmitted repeatedly to ensure reliability, then decoding success rate improves, but resource usage increases
Solution Approach 1:
The patent implements feedback mechanism where the network device transmits feedback indication messages to the terminal device during the data packet transmission process. This feedback provides information about decoding quality and success probability, allowing the system to dynamically adjust transmission strategies, terminate successful transmissions early, and avoid unnecessary retransmissions, thereby reducing resource consumption while maintaining high decoding success rates.
3Measurement precision
If complete decoding is performed before feedback transmission, then feedback accuracy is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by performing partial decoding and quality assessment before complete decoding is finished. The network device calculates quality measures based on received signal characteristics and partial decoding results, then transmits feedback indication messages early in the process. This approach provides sufficiently accurate feedback for transmission termination decisions while significantly reducing the time latency compared to waiting for complete decoding.
Data Source
AI summary
A communications device includes receiver circuitry, transmitter circuitry, and controller circuitry controlling the transmitter circuitry and the receiver circuitry to receive data in accordance with an automatic repeat request (ARQ) type protocol in which the data is received as a plurality of encoded data packets encoded with an error correction code and the transmitter circuitry transmits a feedback signal depending on whether each of the data encoded packets is estimated as having been decoded successfully by the receiver circuitry. The controller circuitry is configured to evaluate a quality measure of each encoded data packet and in response to the evaluated quality measure to transmit an early indication of the feedback signal to the wireless communications network, before the encoded data packet has been decoded by the error correction decoder.