Half-Duplex FDD Small Data Transmission and Paging Coordination

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In Half-Duplex Frequency Division Duplex (HD-FDD) mode, RedCap UEs face challenges in managing overlapping DL and UL transmissions due to undefined UE behavior when paging reception and configured grant-based Small Data Transmission (CG-SDT) resources coincide, leading to potential collisions and resource inefficiencies.

Innovation Solution

The proposed solution involves defining UE behavior by determining proximity conditions between SDT resources and paging reception resources, allowing the UE to adapt SDT operations such as postponing or dropping CG-SDT transmissions when collisions are imminent, ensuring prioritization of paging reception over SDT.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If HD-FDD mode is used to reduce device complexity and cost, then device complexity is reduced, but resource collision occurs between paging reception and SDT transmission

Engineering Contradiction:

Improvedevice complexityVSAvoidresource collision

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The UE determines proximity conditions between SDT resources and paging reception resources in advance, and proactively adapts SDT operations (postponing or dropping transmissions) before collisions occur. This preliminary detection and adaptation mechanism prevents resource collisions while maintaining HD-FDD operation.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If paging reception is prioritized over SDT transmission, then paging reception reliability is improved, but SDT transmission efficiency deteriorates

Engineering Contradiction:

Improvepaging reception reliabilityVSAvoidSDT transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The UE dynamically adapts SDT operations based on determined proximity conditions. When collisions are imminent, the UE postpones or drops SDT transmissions to prioritize paging reception. When no collision is expected, the UE proceeds with SDT transmission, thereby maintaining optimal transmission efficiency while ensuring paging reception reliability.

Inventive Principle:

Principle #15Dynamics

3Productivity

If SDT resources and paging resources overlap in time, then resource utilization increases, but collision risk increases

Engineering Contradiction:

Improveresource utilizationVSAvoidcollision risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The proximity condition determination acts as an intermediary mechanism between SDT resource allocation and paging resource allocation. By evaluating the temporal proximity between these resources, the system can identify potential collisions and adapt SDT operations accordingly, allowing efficient resource utilization while preventing harmful collisions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250331050A1Systems and Methods for Small Data Transmission in Half-Duplex Frequency Division Duplex Mode

Publication Date: 2025.10.23 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method (1000) by a user equipment, UE, (412A-D) for adapting a small data transmission, SDT, includes determining (1002) that at least one proximity condition is fulfilled. The at least one proximity condition is associated with at least one resource for a SDT and at least one paging resource for receiving at least one paging related signal from a network node. The UE performs (1004) at least one task for adapting the SDT based on the at least one proximity condition being fulfilled.