CB Index Interleaving for SBFD Slot Error Rate Uniformity

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Solution Overview

Problem

In subband full-duplex (SBFD) operations, channel blocks (CBGs) closer to the subband edge suffer from uneven error rates due to uneven mapping, leading to interference and reduced channel quality.

Innovation Solution

Implementing CB index interleaving to spread CBs across the entire bandwidth allocation, ensuring even distribution and reducing the impact of subband edge interference by interleaving and deinterleaving CBs across CBGs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CBGs are mapped to time-frequency resources in SBFD slots without interleaving, then the mapping process is simple and fast, but CBGs closer to the subband edge suffer from uneven error rates due to interference

Engineering Contradiction:

Improveerror rate uniformity across CBGsVSAvoidcomplexity of mapping process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the code blocks into code block groups (CBGs) and applies interleaving at the CBG level rather than processing individual CBs. This segmentation allows the system to manage complexity by operating on grouped units while still achieving the benefit of distributed mapping across time-frequency resources, thereby improving error rate uniformity without proportionally increasing processing complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an interleaving mechanism as an intermediary step between CBG generation and resource mapping. This intermediary process redistributes CBGs across time-frequency resources in a controlled manner, ensuring that no single CBG is concentrated in high-interference regions near subband edges, thus achieving more uniform error rates across all CBGs

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If CBGs are concentrated in specific frequency regions for efficient mapping, then the mapping efficiency is high, but interference from subband edges degrades channel quality in those regions

Engineering Contradiction:

Improvemapping efficiencyVSAvoidinterference from subband edges

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent extends the mapping dimensionality by applying interleaving across both time and frequency dimensions simultaneously. Instead of mapping CBGs purely in frequency order (one dimension), the interleaving process distributes CBGs across multiple time slots and frequency resources in a pseudo-random pattern, ensuring that CBGs are not concentrated in interference-prone edge regions while maintaining efficient resource utilization

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20240333444A1Interleaving across cbgs and enhanced mapping for SBFD slots

Publication Date: 2024.10.03 QUALCOMM INC

AI summary

A transmitting device may generate a plurality of CBs. The plurality of CBs may be grouped into a plurality of CBGs. The transmitting device may interleave the plurality of CBs across the plurality of CBGs to construct a channel. The transmitting device may map the channel to one or more time-frequency resources associated with an allocation. The transmitting device may transmit, for a receiving device, the mapped channel using the one or more time-frequency resources. The receiving device may recover a plurality of CBs from the channel. The receiving device may deinterleave the plurality of CBs to recover a plurality of CBGs. The receiving device may decode the deinterleaved plurality of CBs based on the recovered plurality of CBGs.