Hybrid HARQ Timing for Memory-Efficient Decoding
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in managing memory bandwidth during hybrid automatic repeat request (HARQ) procedures, particularly in decoding operations, which limit the ability to write and read data from memory, leading to suboptimal handling of decoding errors.
Innovation Solution
Implementing a HARQ design that allows user equipment (UE) to transmit feedback messages requesting a time delay for retransmissions, enabling a delayed timeline or extended duration for acknowledgment (ACK) or negative acknowledgment (NACK) feedback, and supporting frequency-division multiplexing of transport blocks to optimize memory usage and reduce decoding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmission procedures are implemented with standard timing, then communication reliability is improved through error correction, but memory bandwidth is excessively consumed during decoding operations
Solution Approach 1:
The patent applies dynamics by making the HARQ retransmission timing flexible rather than fixed. The network entity dynamically adjusts the time delay between initial transmission and retransmission based on UE capability indicators. This dynamic timing adjustment spreads LLR loading over longer durations, reducing peak memory bandwidth consumption while maintaining decoding reliability through adaptive retransmission scheduling.
Solution Approach 2:
The patent changes the time parameter of HARQ retransmission by introducing variable time delays. The network entity receives UE capability indicators and modifies the retransmission timing parameters accordingly. This parameter change allows spreading of memory access operations over extended time periods, reducing instantaneous memory bandwidth requirements while preserving error correction effectiveness.
2Productivity
If faster HARQ feedback timelines are used, then communication efficiency is improved, but memory bandwidth constraints are violated during decoding operations
Solution Approach 1:
The system dynamically balances communication efficiency and memory bandwidth usage by adjusting feedback timelines based on UE capabilities. When memory bandwidth is constrained, the network entity extends the time delay for retransmissions, which spreads LLR loading and allows standard memory interfaces to handle the load while maintaining acceptable communication efficiency through adaptive scheduling.
Solution Approach 2:
The network entity performs preliminary assessment of UE capability indicators before scheduling HARQ retransmissions. Based on this preliminary information, the network entity pre-configures appropriate time delays that will prevent memory bandwidth violations while maintaining communication efficiency. This preliminary action ensures that memory constraints are avoided before they occur during actual decoding operations.
3Device complexity
If standard HARQ retransmission timing is used, then system simplicity is maintained, but memory bandwidth violations occur during decoding operations
Solution Approach 1:
The patent implements feedback mechanisms where the UE transmits capability indicators to the network entity regarding its memory bandwidth constraints. The network entity uses this feedback to adjust HARQ retransmission timing appropriately. This feedback loop enables the system to automatically adapt to memory constraints without requiring complex reconfiguration, maintaining relative system simplicity while preventing memory bandwidth violations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein provide HARQ design. In some examples, a user equipment (UE) may receive from a network entity, a transport block. The UE may transmit, to the network entity, one or more feedback messages that indicate that a reception of the transport block was unsuccessful and indicate a request for a time delay associated with a retransmission of the transport block. The UE may receive, from the network entity, the retransmission of the transport block. In some cases, the time delay may be a delayed timeline for a transmission of an acknowledgment feedback or a negative acknowledgment feedback associated with a reception of the retransmission of first transport block. In some examples, the time delay may be an extended transmission duration for the retransmission of the transport block.