Wireless Feedback Latency Alignment for TTI Duration Control
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing feedback processes due to latency between the Transmission Time Interval (TTI) and feedback opportunities, leading to delayed or incomplete feedback, which affects transmission efficiency and throughput.
Innovation Solution
The techniques involve determining TTI durations based on identified latency to ensure the receiving apparatus can prepare appropriate feedback, including selecting between transport block and code block level feedback, and modifying feedback when latency thresholds are not met, thereby optimizing feedback transmission during available opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the TTI duration is extended to improve data transmission capacity, then the throughput increases, but the feedback preparation time becomes insufficient leading to delayed or lost feedback
Solution Approach 1:
The patent implements dynamic TTI duration adjustment where the transmitting apparatus adapts the TTI length based on the receiving apparatus's processing capability and the current latency conditions. This allows the system to optimize between throughput and feedback preparation time by varying TTI duration rather than using a fixed value, resolving the contradiction between extended TTI for higher throughput and sufficient time for feedback preparation.
2Reliability
If the feedback opportunity is delayed to allow complete processing of long TTIs, then feedback accuracy improves, but the latency increases reducing system responsiveness
Solution Approach 1:
The patent employs preliminary action by having the receiving apparatus begin feedback preparation as soon as possible during the TTI, rather than waiting until the TTI completes. The apparatus also performs early verification of whether the TTI duration will allow complete processing before the feedback opportunity arrives, enabling it to take corrective actions in advance such as requesting retransmission or adjusting expectations, thus maintaining feedback accuracy without excessive latency.
3Loss of information
If the receiving apparatus processes all code blocks to ensure complete feedback, then feedback completeness improves, but the processing time exceeds the feedback opportunity window
Solution Approach 1:
The patent implements partial action by allowing the receiving apparatus to process only a subset of code blocks or transport blocks within the available feedback preparation time. The apparatus determines which portions to prioritize based on importance and processing speed, accepting that some feedback may be incomplete rather than delaying beyond the feedback opportunity. This resolves the contradiction by achieving timely feedback with acceptable completeness rather than complete feedback that would miss the deadline.
Data Source
AI summary
Techniques are described for wireless communication. One method includes identifying a latency between a start of a transmission time interval (TTI) of a transmission burst and a feedback opportunity for the TTI, and determining a duration of the TTI based at least in part on the latency. Another method includes identifying a latency between an end of a TTI of a transmission burst and a feedback opportunity for the TTI, identifying a plurality of code blocks in the TTI, selecting one of a transport block level feedback or a code block level feedback for the TTI based at least in part on the latency, and transmitting the selected one of the transport block level feedback or the code block level feedback for the TTI during the feedback opportunity.