Layered Encoding Structure for Low-Latency Wireless Retransmission
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Solution Overview
Problem
Existing wireless communication systems, such as LTE and NR, face challenges in reducing latency, particularly in Ultra-Reliable and Low Latency Communication (URLLC) scenarios, where retransmission latency is dominant.
Innovation Solution
The implementation of an information processing device that uses a two-layer encoding and decoding method. The first protocol layer employs an erasure correction code to generate first coded data, which is then provided to the second protocol layer for further encoding using a second code. This approach allows for stepwise decoding and retransmission in units of symbols, reducing overall latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single-layer encoding method is used, then the device complexity is low, but the latency cannot be reduced effectively because retransmission latency remains dominant
Solution Approach 1:
The encoding process is segmented into two distinct layers: a first encoding layer and a second encoding layer. Each layer performs independent encoding operations with different code types, allowing the system to reduce retransmission latency at the first layer while maintaining overall system reliability through the second layer. This segmentation enables targeted optimization of latency-critical paths without compromising overall system robustness.
Solution Approach 2:
The patent introduces a dual-layer encoding dimension, transforming the traditional single-layer encoding approach into a multi-dimensional encoding structure. This adds a new layer of complexity in the encoding hierarchy, enabling independent optimization of different encoding stages for different performance goals (latency reduction vs. reliability maintenance).
2Loss of time
If retransmission is performed in units of transport blocks, then the encoding structure is simple, but the retransmission latency remains high
Solution Approach 1:
The transport block is segmented into multiple first coded blocks through first encoding, and each first coded block can be independently retransmitted. This segmentation allows the system to retransmit only the specific failed blocks rather than entire transport blocks, significantly reducing retransmission latency while distributing the decoding complexity across multiple smaller units.
Solution Approach 2:
The first coded blocks serve as intermediaries between the original transport block and the final decoded data. These intermediate encoded blocks enable granular retransmission control, where failed intermediaries can be individually retransmitted without requiring retransmission of the entire original data unit, thus reducing latency.
3Reliability
If only erasure correction code is used, then the decoding process is simple, but the communication reliability is insufficient for URLLC requirements
Solution Approach 1:
The patent merges two different encoding approaches: erasure correction encoding (first encoding) and channel encoding (second encoding). The first encoding layer provides robust error correction for latency-critical operations, while the second encoding layer adds additional reliability protection. This combination achieves URLLC-level reliability requirements by leveraging the complementary strengths of both encoding types.
Solution Approach 2:
The encoding structure uses a composite approach, combining different code types (erasure correction codes and channel codes) in a layered manner. This composite encoding structure leverages the error correction capabilities of erasure codes at the first layer and the reliability protection of channel codes at the second layer, achieving enhanced overall reliability suitable for URLLC applications.
Data Source
AI summary
Provided are an information processing device, an encoding method, and a decoding method that implement low latency communication. An information processing device of the present disclosure includes a first processing unit that performs processing of a first protocol layer including processing of generating first coded data by encoding first data with an erasure correction code that is a first code, and provides the first coded data to a second protocol layer lower than the first protocol layer.