Status Report NACK Thresholding for Expired Packet Retransmission
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Solution Overview
Problem
In wireless communication systems, especially in NR systems, HARQ retransmissions on a single carrier lead to low data transmission success rates due to interference, and ARQ mechanisms result in resource waste and increased delays when lower-layer transmission quality is poor, causing data packets to expire.
Innovation Solution
Implement a status report mechanism where a receiving communication apparatus controls feedback of NACK information based on a variable threshold, determining whether to retransmit data packets, and adjusts time-frequency resource allocation based on statistical data to improve data transmission effectiveness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmission is performed on the same carrier to improve reliability, then the data transmission success rate improves, but the transmission fails under strong interference because retransmission is limited to the same carrier
Solution Approach 1:
The patent extends the retransmission capability from a single carrier dimension to multiple carrier dimensions. When HARQ retransmission fails on the original carrier, the system can switch to alternative carriers for retransmission, adding spatial diversity through frequency domain separation. This resolves the contradiction by providing adaptability across multiple carriers while maintaining reliability through diverse retransmission paths.
Solution Approach 2:
The patent changes the parameter of carrier frequency by selecting different carriers for initial transmission and retransmission. By varying the frequency parameter, the system can avoid strong interference that affects specific carriers, thereby improving data transmission success rate while maintaining flexibility in carrier selection.
2Reliability
If ARQ mechanism continuously retransmits unreceived data packets to ensure delivery, then the data transmission reliability improves, but transmission resources are wasted and delays increase when data packets expire
Solution Approach 1:
The patent performs preliminary action by checking whether a data packet has expired before initiating retransmission. The receiving device determines packet expiration status in advance, and the transmitting device checks this status before retransmitting. This prevents wasted retransmission of expired packets, reducing delay and resource waste while maintaining reliability for valid packets.
Solution Approach 2:
The patent implements feedback mechanism where the receiving device sends status reports to the transmitting device indicating which data packets have been successfully received and which are still pending. This feedback allows the transmitting device to make informed decisions about retransmission, avoiding unnecessary retransmission of expired packets while ensuring reliable delivery of valid packets.
3Reliability
If status report includes NACK information for all unsuccessfully received data packets to ensure retransmission, then the data transmission reliability improves, but transmission resources are wasted when packets have expired
Solution Approach 1:
The patent performs preliminary action by checking packet expiration status before including NACK information in status reports. The receiving device determines whether pending data packets have expired in advance, and only includes NACK information for non-expired packets in status reports sent to the transmitting device. This prevents waste of transmission resources on expired packets while maintaining reliability for valid packets.
Solution Approach 2:
The patent extracts only the necessary NACK information from the set of unsuccessfully received data packets. By filtering out expired packets and including only NACK information for valid pending packets, the system reduces the amount of retransmission signaling required, saving transmission resources while maintaining reliability for packets that still need to be delivered.
Data Source
AI summary
A method includes: when a status report triggering condition and/or sending condition are/is met, sending a status report. In response to when a first variable of a first data packet is less than a first threshold, the status report includes negative acknowledgement NACK information of the first data packet; or in response to when a first variable of a first data packet is greater than or equal to a first threshold, the status report does not include NACK information of the first data packet. The first data packet is an unsuccessfully received data packet, and the first variable of the first data packet indicates a quantity of feedback times of the NACK information of the first data packet.