Deferred HARQ Feedback Codebook Positioning for 5G Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in enhancing hybrid automatic repeat request (HARQ) feedback processes, which affect the reliability and efficiency of data transmission in mobile communications.
Innovation Solution
The proposed solution involves enhancing the HARQ feedback process by implementing advanced protocol layers and feedback mechanisms within the wireless device and base station systems, specifically for 5G NR and LTE technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted immediately for each downlink transmission, then the reliability of data transmission is improved, but the uplink feedback resources and device complexity increase
Solution Approach 1:
The patent segments the HARQ feedback codebook into multiple parts (first HARQ feedback information and second HARQ feedback information) corresponding to different downlink transmissions. This segmentation allows the system to manage feedback resources more efficiently by separating feedback for different transmission occasions, thereby maintaining reliability while reducing the complexity of handling a single large feedback message.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the HARQ feedback codebook structure and timing relationships between downlink transmissions and uplink feedback. The base station determines and signals the codebook structure in advance, allowing the wireless device to prepare feedback messages according to predetermined rules, which reduces real-time processing complexity while ensuring reliable feedback transmission.
2Loss of information
If HARQ feedback codebook size is increased to include more feedback information, then the completeness of feedback is improved, but the uplink transmission overhead and resource consumption increase
Solution Approach 1:
The patent divides the overall feedback information into multiple segments transmitted at different times or on different resources. The first HARQ feedback information corresponds to a first downlink transmission while the second HARQ feedback information corresponds to a second downlink transmission. This segmentation reduces the size of individual feedback messages while maintaining overall feedback completeness through multiple smaller transmissions.
Solution Approach 2:
The patent implements periodic feedback transmission where HARQ feedback information is sent at specific intervals or occasions rather than continuously. The feedback codebook is structured to accommodate periodic reporting, allowing the system to maintain complete feedback information while reducing instantaneous message size and resource consumption by spreading feedback over multiple periodic opportunities.
3Loss of time
If the timing between downlink transmission and HARQ feedback is reduced, then the transmission latency is improved, but the available feedback processing time and reliability decrease
Solution Approach 1:
The patent applies preliminary action by pre-configuring timing relationships and feedback processing parameters before actual data transmission occurs. The base station signals timing advance values, feedback timing indicators, and codebook structure in advance, allowing the wireless device to prepare feedback messages with sufficient processing time while maintaining predictable and low latency. This advance preparation ensures both timing efficiency and processing reliability.
Solution Approach 2:
The patent implements dynamic timing adjustment where the HARQ feedback timing can be adapted based on channel conditions, device capabilities, and traffic patterns. The system dynamically selects from multiple feedback timing options or adjusts processing timelines to balance latency requirements against processing reliability, allowing flexible optimization of the timing trade-off rather than using fixed timing relationships.
Data Source
AI summary
A base station may transmit DCI(s) indicating an initial timing of a first HARQ feedback and a first timing of second HARQ feedback(s). The first HARQ feedback may be deferred from the initial timing to the first timing. The base station may receive a HARQ feedback codebook comprising the first HARQ feedback and the second HARQ feedback(s). Based on the first HARQ feedback being deferred, a first position of the first HARQ feedback in the HARQ feedback codebook may be after second position(s) of the second HARQ feedback(s).