FFPL Code Block Grouping for Multi-Layer HARQ Feedback
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in decoding and retransmissions due to high spectral efficiency and low channel coherency, particularly in multi-layer communication links, where code block groups (CBGs) are not effectively utilized to improve Hybrid Automatic Repeat Request (HARQ) feedback and decoding processes.
Innovation Solution
Implementing frequency first per layer (FFPL) mapping, where code blocks are grouped into CBGs spanning multiple layers, allowing for improved decoding through successive interference cancellation (SIC) and minimum mean squared error (MMSE)-SIC demodulation, and optimizing HARQ-ACK feedback to reduce retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If code block groups (CBGs) are not effectively utilized in multi-layer communication links, then HARQ feedback and decoding processes remain inefficient, but implementing CBG grouping adds complexity to the communication protocol
Solution Approach 1:
The patent segments the transport block into multiple code block groups (CBGs) that can be independently decoded and acknowledged. Each CBG contains a subset of code blocks that can be processed separately, allowing the receiver to provide selective HARQ feedback for only the failed CBGs rather than retransmitting the entire transport block, thereby improving decoding efficiency
Solution Approach 2:
The patent introduces a new dimension of grouping organization by mapping code blocks to CBGs in a frequency-first-per-layer manner. This creates a two-dimensional structure where code blocks are first grouped by frequency resources and then by layer, enabling more efficient exploitation of frequency diversity and layer correlation in multi-layer communication
2Productivity
If high spectral efficiency is used in multi-layer communication, then data transmission rate increases, but decoding performance deteriorates due to low channel coherency
Solution Approach 1:
The patent changes the grouping parameters by configuring the number of code blocks per CBG and the mapping pattern between code blocks and CBGs. By adjusting these parameters, the system can adapt to different channel conditions and spectral efficiency requirements, optimizing the balance between transmission rate and decoding reliability
Solution Approach 2:
The patent performs preliminary grouping of code blocks into CBGs before transmission, organizing them in a frequency-first-per-layer manner. This preliminary organization enables the receiver to exploit frequency diversity and layer correlation more effectively during decoding, improving decoding reliability under high spectral efficiency conditions
3Reliability
If code blocks are grouped into CBGs spanning multiple layers, then HARQ-ACK feedback is optimized to reduce retransmissions, but the mapping complexity between code blocks and layers increases
Solution Approach 1:
The patent segments the transport block into multiple CBGs, where each CBG spans multiple layers. This segmentation allows the system to provide independent HARQ feedback for each CBG, optimizing retransmission efficiency by only retransmitting failed CBGs rather than the entire transport block
Solution Approach 2:
The patent introduces a layered dimension to the CBG structure, where code blocks are mapped to CBGs in a frequency-first-per-layer manner. This creates a structured mapping relationship that, while more complex than simple sequential mapping, enables efficient exploitation of layer diversity and provides more flexible HARQ feedback mechanisms
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiving device may receive, via a multi-layer communication link, an indication of one or more parameters for grouping code blocks (CBs) of a transport block (TB) into CB groups (CBGs). The receiving device may receive the TB having multiple CBs mapped to resources of the TB in a frequency first per layer (FFPL) mapping configuration, wherein the CBGs include a CB received on a first layer and a CB received on a second layer of the multi-layer communication link. The receiving device may transmit hybrid automatic repeat request (HARQ)-acknowledgment (ACK) feedback for the CBGs based at least in part on the grouping of the CBs. Numerous other aspects are described.