Localized and Distributed Resource Block Transmission for Frequency Diversity

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Solution Overview

Problem

Existing mobile communication systems face limitations in achieving frequency diversity for transmissions with small payloads, as they often cannot fill multiple resource blocks, leading to insufficient distribution and reduced link performance.

Innovation Solution

A transmission scheme that supports a mix of localized and distributed shared-channel transmission, where resources are divided into localized and distributed resource blocks, allowing data to be transmitted across multiple physical resource blocks, thereby achieving frequency diversity even for users with small payloads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If localized resource-block-based transmission is used, then resource allocation efficiency is improved, but frequency diversity is insufficient for small payloads

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidfrequency diversity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the transmission resource blocks into multiple smaller units and distributes them across different frequency resources. Instead of allocating a single contiguous resource block, the transmission is divided into multiple segments that are spread across the frequency spectrum, enabling small payloads to achieve frequency diversity while maintaining efficient resource utilization.

Inventive Principle:

Principle #1Segmentation

2Reliability

If distributed transmission is used for small payloads, then frequency diversity is improved, but resource utilization efficiency deteriorates

Engineering Contradiction:

Improvefrequency diversityVSAvoidresource utilization efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by differentiating the transmission strategy based on payload size and channel conditions. For small payloads, distributed resource blocks are used to achieve frequency diversity, while for larger payloads, localized contiguous resource blocks are allocated to maximize efficiency. This localized adaptation optimizes both reliability and resource utilization for different scenarios.

Inventive Principle:

Principle #3Local quality

3Reliability

If channel-dependent scheduling is used, then frequency-selective fading is combated, but signaling overhead increases

Engineering Contradiction:

Improvefrequency-selective fading combatVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent implements partial channel-dependent scheduling by applying frequency diversity techniques selectively based on payload size and channel conditions rather than universally. For small payloads where frequency diversity is most beneficial, distributed resource blocks are used with reduced scheduling complexity, while for larger payloads, more traditional scheduling approaches are employed, thus reducing overall signaling overhead while maintaining effectiveness.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11991100B2Localized and distributed transmission

Publication Date: 2024.05.21 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

The available transmission resources on a downlink-shared channel are divided into resource blocks, each resource block comprising a predetermined number of sub-carriers during a predetermined time period. The resource blocks are subdivided into localized resource blocks and distributed resource blocks. A user requiring sufficient resources can be allocated a plurality of said localized resource blocks. A user who would require only a small number of said localized resource blocks can instead be allocated subunits of a plurality of said distributed resource blocks.