Two-Stage HARQ Feedback with Reduced Second-Stage Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) feedback procedures, particularly in scenarios requiring high reliability and low latency, where excessive feedback sizes can hinder performance.
Innovation Solution
Implementing a two-stage feedback procedure where the first stage includes acknowledgment feedback, and the second stage includes additional information about unsuccessful downlink transmissions, with mechanisms to reduce the size of the second stage feedback when limits are exceeded, such as through prioritization and encoding techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-stage feedback procedure is implemented to provide comprehensive decoding information, then reliability of HARQ processes is improved, but feedback overhead increases
Solution Approach 1:
The feedback procedure is divided into two distinct stages: first stage feedback containing ACK/NACK for each component carrier, and second stage feedback containing additional decoding information only for failed component carriers. This segmentation allows comprehensive reliability information to be provided while reducing overall feedback overhead by avoiding duplication of successful decodings.
Solution Approach 2:
The second stage feedback extracts and transmits only the necessary additional information for component carriers that failed to decode, separated from the first stage feedback. This extraction principle ensures that only relevant failure information is transmitted in the second stage, minimizing feedback overhead while maintaining reliability.
2Measurement precision
If complete second stage feedback information is transmitted for all failed component carriers, then measurement precision of channel characteristics is improved, but feedback size exceeds upper limits
Solution Approach 1:
The second stage feedback applies local quality by providing detailed channel characteristics information only for specific component carriers that failed to decode, rather than uniformly for all component carriers. This targeted approach maintains measurement precision where needed while reducing overall feedback size to comply with upper limits.
Solution Approach 2:
The patent implements partial action by transmitting only a subset of the complete second stage feedback information when the upper limit is exceeded. Specifically, it prioritizes and transmits the most critical decoding failure information for the highest priority component carriers, accepting that some less critical information may be omitted to stay within size constraints.
3Productivity
If feedback information is prioritized by component carrier importance, then productivity of critical communications is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary action by pre-configuring priority levels for different component carriers before feedback transmission occurs. This pre-established priority structure enables automatic and efficient prioritization of critical communications during feedback transmission without requiring complex real-time decision-making, thus improving productivity while managing device complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Feedback information associated with decoding downlink information may be reported in a first stage and a second stage. A size of the second stage may be restricted by an upper limit associated with an available set of uplink resources for transmitting the feedback information. Limiting the size of the second stage may include reducing a size of second information generated for the second stage, yielding third information for the second stage. The third information may be transmitted with first information generated for the first stage. Limiting the size of the second stage may also include generating second information having a reduced size based on determining that the upper limit may be exceeded. The reduced-size second information may be transmitted with the first information.