Complete Transport Blocks Across Partial LBT Bandwidth Pieces

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In unlicensed wideband radio systems, efficient data transmission is hindered by partial availability of channels due to transmission collisions, leading to inefficient retransmissions when multiple LBT bandwidth pieces are punctured.

Innovation Solution

Transmitting complete transport blocks without splitting across multiple LBT bandwidth pieces, along with corresponding control information, to ensure efficient decoding and reduce retransmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple LBT bandwidth pieces are transmitted separately, then channel utilization is improved, but transmission reliability deteriorates when collisions occur

Engineering Contradiction:

Improvechannel utilizationVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The transport block is divided into multiple code block groups (CBGs), where each CBG can be independently decoded and acknowledged. This segmentation allows the receiver to request retransmission of only failed CBGs rather than the entire transport block, thus maintaining high channel utilization while improving transmission reliability through selective retransmission.

Inventive Principle:

Principle #1Segmentation

2Speed

If transport blocks are split across multiple bandwidth pieces, then data rate is improved, but decoding complexity increases when partial bandwidth is unavailable

Engineering Contradiction:

Improvedata rateVSAvoiddecoding complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The transport block is segmented into multiple code block groups (CBGs) that can be independently decoded. Each CBG corresponds to a portion of the transmitted data, allowing the receiver to decode successful CBGs independently while requesting retransmission only for failed CBGs. This reduces decoding complexity compared to redecoding the entire transport block.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a code block group size parameter that can be configured to adjust the number of code blocks per group. This parameter change allows optimization between decoding complexity and retransmission efficiency, enabling the system to adapt to different channel conditions and device capabilities.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If complete transport blocks are transmitted without splitting, then decoding efficiency is improved, but retransmission efficiency deteriorates when partial channel availability occurs

Engineering Contradiction:

Improvedecoding efficiencyVSAvoidretransmission time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The transport block is divided into multiple code block groups (CBGs), enabling independent decoding of each group. When partial channel availability occurs due to LBT failures, the receiver can identify which specific CBGs failed and request retransmission of only those groups, rather than requiring retransmission of the entire transport block. This significantly reduces retransmission time while maintaining decoding efficiency for successful CBGs.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4178148B1Methods to transmit multiple transport blocks for unlicensed wideband radio systems

Publication Date: 2025.10.01 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

Figure 1
Figure 2
Figure 3

AI summary

A method by a wireless (110) device includes receiving, from a network node (160), one or more bandwidth pieces. The data scheduled in one of the one or more bandwidth pieces includes at least one complete transport block and control information corresponding to the at least one complete transport block. The method further includes transmitting the data based on the scheduling or control information.